org.apache.batik.ext.awt.g2d
Class AbstractGraphics2D

java.lang.Object
  extended by java.awt.Graphics
      extended by java.awt.Graphics2D
          extended by org.apache.batik.ext.awt.g2d.AbstractGraphics2D
All Implemented Interfaces:
Cloneable
Direct Known Subclasses:
DefaultGraphics2D, SVGGraphics2D

public abstract class AbstractGraphics2D
extends Graphics2D
implements Cloneable

This extension of the java.awt.Graphics2D abstract class is still abstract, but it implements a lot of the Graphics2D method in a way that concrete implementations can reuse. This class uses a GraphicContext to store the state of its various attributes that control the rendering, such as the current Font, Paint or clip. Concrete implementations can focus on implementing the rendering methods, such as drawShape. As a convenience, rendering methods that can be expressed with other rendering methods (e.g., drawRect can be expressed as draw(new Rectangle(..))), are implemented by AbstractGraphics2D

See Also:
GraphicContext

Field Summary
protected  GraphicContext gc
          Current state of the Graphic Context.
protected  boolean textAsShapes
          Text handling strategy.
 
Constructor Summary
AbstractGraphics2D(AbstractGraphics2D g)
          Creates a new AbstractGraphics2D from an existing instance.
AbstractGraphics2D(boolean textAsShapes)
           
 
Method Summary
 void addRenderingHints(Map hints)
          Sets the values of an arbitrary number of preferences for the rendering algorithms.
 void clearRect(int x, int y, int width, int height)
          Clears the specified rectangle by filling it with the background color of the current drawing surface.
 void clip(Shape s)
          Intersects the current Clip with the interior of the specified Shape and sets the Clip to the resulting intersection.
 void clipRect(int x, int y, int width, int height)
          Intersects the current clip with the specified rectangle.
 void drawArc(int x, int y, int width, int height, int startAngle, int arcAngle)
          Draws the outline of a circular or elliptical arc covering the specified rectangle.
 void drawGlyphVector(GlyphVector g, float x, float y)
          Renders the text of the specified GlyphVector using the Graphics2D context's rendering attributes.
 void drawImage(BufferedImage img, BufferedImageOp op, int x, int y)
          Renders a BufferedImage that is filtered with a BufferedImageOp.
 boolean drawImage(Image img, AffineTransform xform, ImageObserver obs)
          Renders an image, applying a transform from image space into user space before drawing.
 boolean drawImage(Image img, int x, int y, Color bgcolor, ImageObserver observer)
          Draws as much of the specified image as is currently available.
 boolean drawImage(Image img, int x, int y, int width, int height, Color bgcolor, ImageObserver observer)
          Draws as much of the specified image as has already been scaled to fit inside the specified rectangle.
 boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, Color bgcolor, ImageObserver observer)
          Draws as much of the specified area of the specified image as is currently available, scaling it on the fly to fit inside the specified area of the destination drawable surface.
 boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, ImageObserver observer)
          Draws as much of the specified area of the specified image as is currently available, scaling it on the fly to fit inside the specified area of the destination drawable surface.
 void drawLine(int x1, int y1, int x2, int y2)
          Draws a line, using the current color, between the points (x1, y1) and (x2, y2) in this graphics context's coordinate system.
 void drawOval(int x, int y, int width, int height)
          Draws the outline of an oval.
 void drawPolygon(int[] xPoints, int[] yPoints, int nPoints)
          Draws a closed polygon defined by arrays of x and y coordinates.
 void drawPolyline(int[] xPoints, int[] yPoints, int nPoints)
          Draws a sequence of connected lines defined by arrays of x and y coordinates.
 void drawRect(int x, int y, int width, int height)
           
 void drawRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight)
          Draws an outlined round-cornered rectangle using this graphics context's current color.
 void drawString(AttributedCharacterIterator iterator, int x, int y)
          Draws the text given by the specified iterator, using this graphics context's current color.
 void drawString(String str, int x, int y)
          Draws the text given by the specified string, using this graphics context's current font and color.
 void fillArc(int x, int y, int width, int height, int startAngle, int arcAngle)
          Fills a circular or elliptical arc covering the specified rectangle.
 void fillOval(int x, int y, int width, int height)
          Fills an oval bounded by the specified rectangle with the current color.
 void fillPolygon(int[] xPoints, int[] yPoints, int nPoints)
          Fills a closed polygon defined by arrays of x and y coordinates.
 void fillRect(int x, int y, int width, int height)
          Fills the specified rectangle.
 void fillRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight)
          Fills the specified rounded corner rectangle with the current color.
 Color getBackground()
          Returns the background color used for clearing a region.
 Shape getClip()
          Gets the current clipping area.
 Rectangle getClipBounds()
          Returns the bounding rectangle of the current clipping area.
 Color getColor()
          Gets this graphics context's current color.
 Composite getComposite()
          Returns the current Composite in the Graphics2D context.
 Font getFont()
          Gets the current font.
 FontRenderContext getFontRenderContext()
          Get the rendering context of the Font within this Graphics2D context.
 GraphicContext getGraphicContext()
           
 Paint getPaint()
          Returns the current Paint of the Graphics2D context.
 Object getRenderingHint(RenderingHints.Key hintKey)
          Returns the value of a single preference for the rendering algorithms.
 RenderingHints getRenderingHints()
          Gets the preferences for the rendering algorithms.
 Stroke getStroke()
          Returns the current Stroke in the Graphics2D context.
 AffineTransform getTransform()
          Returns a copy of the current Transform in the Graphics2D context.
 boolean hit(Rectangle rect, Shape s, boolean onStroke)
          Checks whether or not the specified Shape intersects the specified Rectangle, which is in device space.
 void rotate(double theta)
          Concatenates the current Graphics2D Transform with a rotation transform.
 void rotate(double theta, double x, double y)
          Concatenates the current Graphics2D Transform with a translated rotation transform.
 void scale(double sx, double sy)
          Concatenates the current Graphics2D Transform with a scaling transformation Subsequent rendering is resized according to the specified scaling factors relative to the previous scaling.
 void setBackground(Color color)
          Sets the background color for the Graphics2D context.
 void setClip(int x, int y, int width, int height)
          Sets the current clip to the rectangle specified by the given coordinates.
 void setClip(Shape clip)
          Sets the current clipping area to an arbitrary clip shape.
 void setColor(Color c)
          Sets this graphics context's current color to the specified color.
 void setComposite(Composite comp)
          Sets the Composite for the Graphics2D context.
 void setFont(Font font)
          Sets this graphics context's font to the specified font.
 void setPaint(Paint paint)
          Sets the Paint attribute for the Graphics2D context.
 void setPaintMode()
          Sets the paint mode of this graphics context to overwrite the destination with this graphics context's current color.
 void setRenderingHint(RenderingHints.Key hintKey, Object hintValue)
          Sets the value of a single preference for the rendering algorithms.
 void setRenderingHints(Map hints)
          Replaces the values of all preferences for the rendering algorithms with the specified hints.
 void setStroke(Stroke s)
          Sets the Stroke for the Graphics2D context.
 void setTransform(AffineTransform Tx)
          Sets the Transform in the Graphics2D context.
 void shear(double shx, double shy)
          Concatenates the current Graphics2D Transform with a shearing transform.
 void transform(AffineTransform Tx)
          Composes an AffineTransform object with the Transform in this Graphics2D according to the rule last-specified-first-applied.
 void translate(double tx, double ty)
          Concatenates the current Graphics2D Transform with a translation transform.
 void translate(int x, int y)
          Translates the origin of the graphics context to the point (xy) in the current coordinate system.
 
Methods inherited from class java.awt.Graphics2D
draw, draw3DRect, drawRenderableImage, drawRenderedImage, drawString, drawString, fill, fill3DRect, getDeviceConfiguration
 
Methods inherited from class java.awt.Graphics
copyArea, create, create, dispose, drawBytes, drawChars, drawImage, drawImage, drawPolygon, fillPolygon, finalize, getClipBounds, getClipRect, getFontMetrics, getFontMetrics, hitClip, setXORMode, toString
 
Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

gc

protected GraphicContext gc
Current state of the Graphic Context. The GraphicsContext class manages the state of this Graphics2D graphic context attributes.


textAsShapes

protected boolean textAsShapes
Text handling strategy.

Constructor Detail

AbstractGraphics2D

public AbstractGraphics2D(boolean textAsShapes)
Parameters:
textAsShapes - if true, all text is turned into shapes in the convertion. No text is output.

AbstractGraphics2D

public AbstractGraphics2D(AbstractGraphics2D g)
Creates a new AbstractGraphics2D from an existing instance.

Parameters:
g - the AbstractGraphics2D whose properties should be copied
Method Detail

translate

public void translate(int x,
                      int y)
Translates the origin of the graphics context to the point (xy) in the current coordinate system. Modifies this graphics context so that its new origin corresponds to the point (xy) in this graphics context's original coordinate system. All coordinates used in subsequent rendering operations on this graphics context will be relative to this new origin.

Specified by:
translate in class Graphics2D
Parameters:
x - the x coordinate.
y - the y coordinate.

getColor

public Color getColor()
Gets this graphics context's current color.

Specified by:
getColor in class Graphics
Returns:
this graphics context's current color.
See Also:
Color, Graphics.setColor(java.awt.Color)

setColor

public void setColor(Color c)
Sets this graphics context's current color to the specified color. All subsequent graphics operations using this graphics context use this specified color.

Specified by:
setColor in class Graphics
Parameters:
c - the new rendering color.
See Also:
Color, Graphics.getColor()

setPaintMode

public void setPaintMode()
Sets the paint mode of this graphics context to overwrite the destination with this graphics context's current color. This sets the logical pixel operation function to the paint or overwrite mode. All subsequent rendering operations will overwrite the destination with the current color.

Specified by:
setPaintMode in class Graphics

getFont

public Font getFont()
Gets the current font.

Specified by:
getFont in class Graphics
Returns:
this graphics context's current font.
See Also:
Font, Graphics.setFont(java.awt.Font)

setFont

public void setFont(Font font)
Sets this graphics context's font to the specified font. All subsequent text operations using this graphics context use this font.

Specified by:
setFont in class Graphics
Parameters:
font - the font.
See Also:
Graphics.getFont()

getClipBounds

public Rectangle getClipBounds()
Returns the bounding rectangle of the current clipping area. This method refers to the user clip, which is independent of the clipping associated with device bounds and window visibility. If no clip has previously been set, or if the clip has been cleared using setClip(null), this method returns null. The coordinates in the rectangle are relative to the coordinate system origin of this graphics context.

Specified by:
getClipBounds in class Graphics
Returns:
the bounding rectangle of the current clipping area, or null if no clip is set.
Since:
JDK1.1
See Also:
Graphics.getClip(), Graphics.clipRect(int, int, int, int), Graphics.setClip(int, int, int, int), Graphics.setClip(Shape)

clipRect

public void clipRect(int x,
                     int y,
                     int width,
                     int height)
Intersects the current clip with the specified rectangle. The resulting clipping area is the intersection of the current clipping area and the specified rectangle. If there is no current clipping area, either because the clip has never been set, or the clip has been cleared using setClip(null), the specified rectangle becomes the new clip. This method sets the user clip, which is independent of the clipping associated with device bounds and window visibility. This method can only be used to make the current clip smaller. To set the current clip larger, use any of the setClip methods. Rendering operations have no effect outside of the clipping area.

Specified by:
clipRect in class Graphics
Parameters:
x - the x coordinate of the rectangle to intersect the clip with
y - the y coordinate of the rectangle to intersect the clip with
width - the width of the rectangle to intersect the clip with
height - the height of the rectangle to intersect the clip with
See Also:
setClip(int, int, int, int), setClip(Shape)

setClip

public void setClip(int x,
                    int y,
                    int width,
                    int height)
Sets the current clip to the rectangle specified by the given coordinates. This method sets the user clip, which is independent of the clipping associated with device bounds and window visibility. Rendering operations have no effect outside of the clipping area.

Specified by:
setClip in class Graphics
Parameters:
x - the x coordinate of the new clip rectangle.
y - the y coordinate of the new clip rectangle.
width - the width of the new clip rectangle.
height - the height of the new clip rectangle.
Since:
JDK1.1
See Also:
Graphics.clipRect(int, int, int, int), Graphics.setClip(Shape)

getClip

public Shape getClip()
Gets the current clipping area. This method returns the user clip, which is independent of the clipping associated with device bounds and window visibility. If no clip has previously been set, or if the clip has been cleared using setClip(null), this method returns null.

Specified by:
getClip in class Graphics
Returns:
a Shape object representing the current clipping area, or null if no clip is set.
Since:
JDK1.1
See Also:
Graphics.getClipBounds(), Graphics.clipRect(int, int, int, int), Graphics.setClip(int, int, int, int), Graphics.setClip(Shape)

setClip

public void setClip(Shape clip)
Sets the current clipping area to an arbitrary clip shape. Not all objects that implement the Shape interface can be used to set the clip. The only Shape objects that are guaranteed to be supported are Shape objects that are obtained via the getClip method and via Rectangle objects. This method sets the user clip, which is independent of the clipping associated with device bounds and window visibility.

Specified by:
setClip in class Graphics
Parameters:
clip - the Shape to use to set the clip
Since:
JDK1.1
See Also:
Graphics.getClip(), Graphics.clipRect(int, int, int, int), Graphics.setClip(int, int, int, int)

drawLine

public void drawLine(int x1,
                     int y1,
                     int x2,
                     int y2)
Draws a line, using the current color, between the points (x1, y1) and (x2, y2) in this graphics context's coordinate system.

Specified by:
drawLine in class Graphics
Parameters:
x1 - the first point's x coordinate.
y1 - the first point's y coordinate.
x2 - the second point's x coordinate.
y2 - the second point's y coordinate.

fillRect

public void fillRect(int x,
                     int y,
                     int width,
                     int height)
Fills the specified rectangle. The left and right edges of the rectangle are at x and x + width - 1. The top and bottom edges are at y and y + height - 1. The resulting rectangle covers an area width pixels wide by height pixels tall. The rectangle is filled using the graphics context's current color.

Specified by:
fillRect in class Graphics
Parameters:
x - the x coordinate of the rectangle to be filled.
y - the y coordinate of the rectangle to be filled.
width - the width of the rectangle to be filled.
height - the height of the rectangle to be filled.
See Also:
Graphics.clearRect(int, int, int, int), Graphics.drawRect(int, int, int, int)

drawRect

public void drawRect(int x,
                     int y,
                     int width,
                     int height)
Overrides:
drawRect in class Graphics

clearRect

public void clearRect(int x,
                      int y,
                      int width,
                      int height)
Clears the specified rectangle by filling it with the background color of the current drawing surface. This operation does not use the current paint mode.

Beginning with Java 1.1, the background color of offscreen images may be system dependent. Applications should use setColor followed by fillRect to ensure that an offscreen image is cleared to a specific color.

Specified by:
clearRect in class Graphics
Parameters:
x - the x coordinate of the rectangle to clear.
y - the y coordinate of the rectangle to clear.
width - the width of the rectangle to clear.
height - the height of the rectangle to clear.
See Also:
Graphics.fillRect(int, int, int, int), Graphics.drawRect(int, int, int, int), Graphics.setColor(java.awt.Color), Graphics.setPaintMode(), Graphics.setXORMode(java.awt.Color)

drawRoundRect

public void drawRoundRect(int x,
                          int y,
                          int width,
                          int height,
                          int arcWidth,
                          int arcHeight)
Draws an outlined round-cornered rectangle using this graphics context's current color. The left and right edges of the rectangle are at x and x + width, respectively. The top and bottom edges of the rectangle are at y and y + height.

Specified by:
drawRoundRect in class Graphics
Parameters:
x - the x coordinate of the rectangle to be drawn.
y - the y coordinate of the rectangle to be drawn.
width - the width of the rectangle to be drawn.
height - the height of the rectangle to be drawn.
arcWidth - the horizontal diameter of the arc at the four corners.
arcHeight - the vertical diameter of the arc at the four corners.
See Also:
Graphics.fillRoundRect(int, int, int, int, int, int)

fillRoundRect

public void fillRoundRect(int x,
                          int y,
                          int width,
                          int height,
                          int arcWidth,
                          int arcHeight)
Fills the specified rounded corner rectangle with the current color. The left and right edges of the rectangle are at x and x + width - 1, respectively. The top and bottom edges of the rectangle are at y and y + height - 1.

Specified by:
fillRoundRect in class Graphics
Parameters:
x - the x coordinate of the rectangle to be filled.
y - the y coordinate of the rectangle to be filled.
width - the width of the rectangle to be filled.
height - the height of the rectangle to be filled.
arcWidth - the horizontal diameter of the arc at the four corners.
arcHeight - the vertical diameter of the arc at the four corners.
See Also:
Graphics.drawRoundRect(int, int, int, int, int, int)

drawOval

public void drawOval(int x,
                     int y,
                     int width,
                     int height)
Draws the outline of an oval. The result is a circle or ellipse that fits within the rectangle specified by the x, y, width, and height arguments.

The oval covers an area that is width + 1 pixels wide and height + 1 pixels tall.

Specified by:
drawOval in class Graphics
Parameters:
x - the x coordinate of the upper left corner of the oval to be drawn.
y - the y coordinate of the upper left corner of the oval to be drawn.
width - the width of the oval to be drawn.
height - the height of the oval to be drawn.
See Also:
Graphics.fillOval(int, int, int, int)

fillOval

public void fillOval(int x,
                     int y,
                     int width,
                     int height)
Fills an oval bounded by the specified rectangle with the current color.

Specified by:
fillOval in class Graphics
Parameters:
x - the x coordinate of the upper left corner of the oval to be filled.
y - the y coordinate of the upper left corner of the oval to be filled.
width - the width of the oval to be filled.
height - the height of the oval to be filled.
See Also:
Graphics.drawOval(int, int, int, int)

drawArc

public void drawArc(int x,
                    int y,
                    int width,
                    int height,
                    int startAngle,
                    int arcAngle)
Draws the outline of a circular or elliptical arc covering the specified rectangle.

The resulting arc begins at startAngle and extends for arcAngle degrees, using the current color. Angles are interpreted such that 0 degrees is at the 3 o'clock position. A positive value indicates a counter-clockwise rotation while a negative value indicates a clockwise rotation.

The center of the arc is the center of the rectangle whose origin is (xy) and whose size is specified by the width and height arguments.

The resulting arc covers an area width + 1 pixels wide by height + 1 pixels tall.

The angles are specified relative to the non-square extents of the bounding rectangle such that 45 degrees always falls on the line from the center of the ellipse to the upper right corner of the bounding rectangle. As a result, if the bounding rectangle is noticeably longer in one axis than the other, the angles to the start and end of the arc segment will be skewed farther along the longer axis of the bounds.

Specified by:
drawArc in class Graphics
Parameters:
x - the x coordinate of the upper-left corner of the arc to be drawn.
y - the y coordinate of the upper-left corner of the arc to be drawn.
width - the width of the arc to be drawn.
height - the height of the arc to be drawn.
startAngle - the beginning angle.
arcAngle - the angular extent of the arc, relative to the start angle.
See Also:
Graphics.fillArc(int, int, int, int, int, int)

fillArc

public void fillArc(int x,
                    int y,
                    int width,
                    int height,
                    int startAngle,
                    int arcAngle)
Fills a circular or elliptical arc covering the specified rectangle.

The resulting arc begins at startAngle and extends for arcAngle degrees. Angles are interpreted such that 0 degrees is at the 3 o'clock position. A positive value indicates a counter-clockwise rotation while a negative value indicates a clockwise rotation.

The center of the arc is the center of the rectangle whose origin is (xy) and whose size is specified by the width and height arguments.

The resulting arc covers an area width + 1 pixels wide by height + 1 pixels tall.

The angles are specified relative to the non-square extents of the bounding rectangle such that 45 degrees always falls on the line from the center of the ellipse to the upper right corner of the bounding rectangle. As a result, if the bounding rectangle is noticeably longer in one axis than the other, the angles to the start and end of the arc segment will be skewed farther along the longer axis of the bounds.

Specified by:
fillArc in class Graphics
Parameters:
x - the x coordinate of the upper-left corner of the arc to be filled.
y - the y coordinate of the upper-left corner of the arc to be filled.
width - the width of the arc to be filled.
height - the height of the arc to be filled.
startAngle - the beginning angle.
arcAngle - the angular extent of the arc, relative to the start angle.
See Also:
Graphics.drawArc(int, int, int, int, int, int)

drawPolyline

public void drawPolyline(int[] xPoints,
                         int[] yPoints,
                         int nPoints)
Draws a sequence of connected lines defined by arrays of x and y coordinates. Each pair of (xy) coordinates defines a point. The figure is not closed if the first point differs from the last point.

Specified by:
drawPolyline in class Graphics
Parameters:
xPoints - an array of x points
yPoints - an array of y points
nPoints - the total number of points
Since:
JDK1.1
See Also:
Graphics.drawPolygon(int[], int[], int)

drawPolygon

public void drawPolygon(int[] xPoints,
                        int[] yPoints,
                        int nPoints)
Draws a closed polygon defined by arrays of x and y coordinates. Each pair of (xy) coordinates defines a point.

This method draws the polygon defined by nPoint line segments, where the first nPoint - 1 line segments are line segments from (xPoints[i - 1], yPoints[i - 1]) to (xPoints[i], yPoints[i]), for 1 ≤ i ≤ nPoints. The figure is automatically closed by drawing a line connecting the final point to the first point, if those points are different.

Specified by:
drawPolygon in class Graphics
Parameters:
xPoints - a an array of x coordinates.
yPoints - a an array of y coordinates.
nPoints - a the total number of points.
See Also:
Graphics.fillPolygon(int[],int[],int), Graphics.drawPolyline(int[], int[], int)

fillPolygon

public void fillPolygon(int[] xPoints,
                        int[] yPoints,
                        int nPoints)
Fills a closed polygon defined by arrays of x and y coordinates.

This method draws the polygon defined by nPoint line segments, where the first nPoint - 1 line segments are line segments from (xPoints[i - 1], yPoints[i - 1]) to (xPoints[i], yPoints[i]), for 1 ≤ i ≤ nPoints. The figure is automatically closed by drawing a line connecting the final point to the first point, if those points are different.

The area inside the polygon is defined using an even-odd fill rule, also known as the alternating rule.

Specified by:
fillPolygon in class Graphics
Parameters:
xPoints - a an array of x coordinates.
yPoints - a an array of y coordinates.
nPoints - a the total number of points.
See Also:
Graphics.drawPolygon(int[], int[], int)

drawString

public void drawString(String str,
                       int x,
                       int y)
Draws the text given by the specified string, using this graphics context's current font and color. The baseline of the first character is at position (xy) in this graphics context's coordinate system.

Specified by:
drawString in class Graphics2D
Parameters:
str - the string to be drawn.
x - the x coordinate.
y - the y coordinate.
See Also:
Graphics.drawBytes(byte[], int, int, int, int), Graphics.drawChars(char[], int, int, int, int)

drawString

public void drawString(AttributedCharacterIterator iterator,
                       int x,
                       int y)
Draws the text given by the specified iterator, using this graphics context's current color. The iterator has to specify a font for each character. The baseline of the first character is at position (xy) in this graphics context's coordinate system.

Specified by:
drawString in class Graphics2D
Parameters:
iterator - the iterator whose text is to be drawn
x - the x coordinate.
y - the y coordinate.
See Also:
Graphics.drawBytes(byte[], int, int, int, int), Graphics.drawChars(char[], int, int, int, int)

drawImage

public boolean drawImage(Image img,
                         int x,
                         int y,
                         Color bgcolor,
                         ImageObserver observer)
Draws as much of the specified image as is currently available. The image is drawn with its top-left corner at (xy) in this graphics context's coordinate space. Transparent pixels are drawn in the specified background color.

This operation is equivalent to filling a rectangle of the width and height of the specified image with the given color and then drawing the image on top of it, but possibly more efficient.

This method returns immediately in all cases, even if the complete image has not yet been loaded, and it has not been dithered and converted for the current output device.

If the image has not yet been completely loaded, then drawImage returns false. As more of the image becomes available, the process that draws the image notifies the specified image observer.

Specified by:
drawImage in class Graphics
Parameters:
img - the specified image to be drawn.
x - the x coordinate.
y - the y coordinate.
bgcolor - the background color to paint under the non-opaque portions of the image.
observer - object to be notified as more of the image is converted.
See Also:
Image, ImageObserver, ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)

drawImage

public boolean drawImage(Image img,
                         int x,
                         int y,
                         int width,
                         int height,
                         Color bgcolor,
                         ImageObserver observer)
Draws as much of the specified image as has already been scaled to fit inside the specified rectangle.

The image is drawn inside the specified rectangle of this graphics context's coordinate space, and is scaled if necessary. Transparent pixels are drawn in the specified background color. This operation is equivalent to filling a rectangle of the width and height of the specified image with the given color and then drawing the image on top of it, but possibly more efficient.

This method returns immediately in all cases, even if the entire image has not yet been scaled, dithered, and converted for the current output device. If the current output representation is not yet complete then drawImage returns false. As more of the image becomes available, the process that draws the image notifies the specified image observer.

A scaled version of an image will not necessarily be available immediately just because an unscaled version of the image has been constructed for this output device. Each size of the image may be cached separately and generated from the original data in a separate image production sequence.

Specified by:
drawImage in class Graphics
Parameters:
img - the specified image to be drawn.
x - the x coordinate.
y - the y coordinate.
width - the width of the rectangle.
height - the height of the rectangle.
bgcolor - the background color to paint under the non-opaque portions of the image.
observer - object to be notified as more of the image is converted.
See Also:
Image, ImageObserver, ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)

drawImage

public boolean drawImage(Image img,
                         int dx1,
                         int dy1,
                         int dx2,
                         int dy2,
                         int sx1,
                         int sy1,
                         int sx2,
                         int sy2,
                         ImageObserver observer)
Draws as much of the specified area of the specified image as is currently available, scaling it on the fly to fit inside the specified area of the destination drawable surface. Transparent pixels do not affect whatever pixels are already there.

This method returns immediately in all cases, even if the image area to be drawn has not yet been scaled, dithered, and converted for the current output device. If the current output representation is not yet complete then drawImage returns false. As more of the image becomes available, the process that draws the image notifies the specified image observer.

This method always uses the unscaled version of the image to render the scaled rectangle and performs the required scaling on the fly. It does not use a cached, scaled version of the image for this operation. Scaling of the image from source to destination is performed such that the first coordinate of the source rectangle is mapped to the first coordinate of the destination rectangle, and the second source coordinate is mapped to the second destination coordinate. The subimage is scaled and flipped as needed to preserve those mappings.

Specified by:
drawImage in class Graphics
Parameters:
img - the specified image to be drawn
dx1 - the x coordinate of the first corner of the destination rectangle.
dy1 - the y coordinate of the first corner of the destination rectangle.
dx2 - the x coordinate of the second corner of the destination rectangle.
dy2 - the y coordinate of the second corner of the destination rectangle.
sx1 - the x coordinate of the first corner of the source rectangle.
sy1 - the y coordinate of the first corner of the source rectangle.
sx2 - the x coordinate of the second corner of the source rectangle.
sy2 - the y coordinate of the second corner of the source rectangle.
observer - object to be notified as more of the image is scaled and converted.
Since:
JDK1.1
See Also:
Image, ImageObserver, ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)

drawImage

public boolean drawImage(Image img,
                         int dx1,
                         int dy1,
                         int dx2,
                         int dy2,
                         int sx1,
                         int sy1,
                         int sx2,
                         int sy2,
                         Color bgcolor,
                         ImageObserver observer)
Draws as much of the specified area of the specified image as is currently available, scaling it on the fly to fit inside the specified area of the destination drawable surface.

Transparent pixels are drawn in the specified background color. This operation is equivalent to filling a rectangle of the width and height of the specified image with the given color and then drawing the image on top of it, but possibly more efficient.

This method returns immediately in all cases, even if the image area to be drawn has not yet been scaled, dithered, and converted for the current output device. If the current output representation is not yet complete then drawImage returns false. As more of the image becomes available, the process that draws the image notifies the specified image observer.

This method always uses the unscaled version of the image to render the scaled rectangle and performs the required scaling on the fly. It does not use a cached, scaled version of the image for this operation. Scaling of the image from source to destination is performed such that the first coordinate of the source rectangle is mapped to the first coordinate of the destination rectangle, and the second source coordinate is mapped to the second destination coordinate. The subimage is scaled and flipped as needed to preserve those mappings.

Specified by:
drawImage in class Graphics
Parameters:
img - the specified image to be drawn
dx1 - the x coordinate of the first corner of the destination rectangle.
dy1 - the y coordinate of the first corner of the destination rectangle.
dx2 - the x coordinate of the second corner of the destination rectangle.
dy2 - the y coordinate of the second corner of the destination rectangle.
sx1 - the x coordinate of the first corner of the source rectangle.
sy1 - the y coordinate of the first corner of the source rectangle.
sx2 - the x coordinate of the second corner of the source rectangle.
sy2 - the y coordinate of the second corner of the source rectangle.
bgcolor - the background color to paint under the non-opaque portions of the image.
observer - object to be notified as more of the image is scaled and converted.
Since:
JDK1.1
See Also:
Image, ImageObserver, ImageObserver.imageUpdate(java.awt.Image, int, int, int, int, int)

drawImage

public boolean drawImage(Image img,
                         AffineTransform xform,
                         ImageObserver obs)
Renders an image, applying a transform from image space into user space before drawing. The transformation from user space into device space is done with the current Transform in the Graphics2D. The specified transformation is applied to the image before the transform attribute in the Graphics2D context is applied. The rendering attributes applied include the Clip, Transform, and Composite attributes. Note that no rendering is done if the specified transform is noninvertible.

Specified by:
drawImage in class Graphics2D
Parameters:
img - the Image to be rendered
xform - the transformation from image space into user space
obs - the ImageObserver to be notified as more of the Image is converted
Returns:
true if the Image is fully loaded and completely rendered; false if the Image is still being loaded.
See Also:
transform(java.awt.geom.AffineTransform), setTransform(java.awt.geom.AffineTransform), setComposite(java.awt.Composite), clip(java.awt.Shape), setClip(Shape)

drawImage

public void drawImage(BufferedImage img,
                      BufferedImageOp op,
                      int x,
                      int y)
Renders a BufferedImage that is filtered with a BufferedImageOp. The rendering attributes applied include the Clip, Transform and Composite attributes. This is equivalent to:
 img1 = op.filter(img, null);
 drawImage(img1, new AffineTransform(1f,0f,0f,1f,x,y), null);
 

Specified by:
drawImage in class Graphics2D
Parameters:
img - the BufferedImage to be rendered
op - the filter to be applied to the image before rendering
x - the x coordinate in user space where the image is rendered
y - the y coordinate in user space where the image is rendered
See Also:
transform(java.awt.geom.AffineTransform), setTransform(java.awt.geom.AffineTransform), setComposite(java.awt.Composite), clip(java.awt.Shape), setClip(Shape)

drawGlyphVector

public void drawGlyphVector(GlyphVector g,
                            float x,
                            float y)
Renders the text of the specified GlyphVector using the Graphics2D context's rendering attributes. The rendering attributes applied include the Clip, Transform, Paint, and Composite attributes. The GlyphVector specifies individual glyphs from a Font. The GlyphVector can also contain the glyph positions. This is the fastest way to render a set of characters to the screen.

Specified by:
drawGlyphVector in class Graphics2D
Parameters:
g - the GlyphVector to be rendered
x - the x position in user space where the glyphs should be rendered
y - the y position in user space where the glyphs should be rendered
See Also:
Font.createGlyphVector(FontRenderContext, char[]), GlyphVector, setPaint(java.awt.Paint), Graphics.setColor(java.awt.Color), setTransform(java.awt.geom.AffineTransform), setComposite(java.awt.Composite), setClip(Shape)

hit

public boolean hit(Rectangle rect,
                   Shape s,
                   boolean onStroke)
Checks whether or not the specified Shape intersects the specified Rectangle, which is in device space. If onStroke is false, this method checks whether or not the interior of the specified Shape intersects the specified Rectangle. If onStroke is true, this method checks whether or not the Stroke of the specified Shape outline intersects the specified Rectangle. The rendering attributes taken into account include the Clip, Transform, and Stroke attributes.

Specified by:
hit in class Graphics2D
Parameters:
rect - the area in device space to check for a hit
s - the Shape to check for a hit
onStroke - flag used to choose between testing the stroked or the filled shape. If the flag is true, the Stroke oultine is tested. If the flag is false, the filled Shape is tested.
Returns:
true if there is a hit; false otherwise.
See Also:
setStroke(java.awt.Stroke), Graphics2D.fill(Shape), Graphics2D.draw(Shape), transform(java.awt.geom.AffineTransform), setTransform(java.awt.geom.AffineTransform), clip(java.awt.Shape), setClip(Shape)

setComposite

public void setComposite(Composite comp)
Sets the Composite for the Graphics2D context. The Composite is used in all drawing methods such as drawImage, drawString, draw, and fill. It specifies how new pixels are to be combined with the existing pixels on the graphics device during the rendering process.

If this Graphics2D context is drawing to a Component on the display screen and the Composite is a custom object rather than an instance of the AlphaComposite class, and if there is a security manager, its checkPermission method is called with an AWTPermission("readDisplayPixels") permission.

Specified by:
setComposite in class Graphics2D
Parameters:
comp - the Composite object to be used for rendering
Throws:
SecurityException - if a custom Composite object is being used to render to the screen and a security manager is set and its checkPermission method does not allow the operation.
See Also:
Graphics.setXORMode(java.awt.Color), Graphics.setPaintMode(), AlphaComposite

setPaint

public void setPaint(Paint paint)
Sets the Paint attribute for the Graphics2D context. Calling this method with a null Paint object does not have any effect on the current Paint attribute of this Graphics2D.

Specified by:
setPaint in class Graphics2D
Parameters:
paint - the Paint object to be used to generate color during the rendering process, or null
See Also:
Graphics.setColor(java.awt.Color)

setStroke

public void setStroke(Stroke s)
Sets the Stroke for the Graphics2D context.

Specified by:
setStroke in class Graphics2D
Parameters:
s - the Stroke object to be used to stroke a Shape during the rendering process

setRenderingHint

public void setRenderingHint(RenderingHints.Key hintKey,
                             Object hintValue)
Sets the value of a single preference for the rendering algorithms. Hint categories include controls for rendering quality and overall time/quality trade-off in the rendering process. Refer to the RenderingHints class for definitions of some common keys and values.

Specified by:
setRenderingHint in class Graphics2D
Parameters:
hintKey - the key of the hint to be set.
hintValue - the value indicating preferences for the specified hint category.
See Also:
RenderingHints

getRenderingHint

public Object getRenderingHint(RenderingHints.Key hintKey)
Returns the value of a single preference for the rendering algorithms. Hint categories include controls for rendering quality and overall time/quality trade-off in the rendering process. Refer to the RenderingHints class for definitions of some common keys and values.

Specified by:
getRenderingHint in class Graphics2D
Parameters:
hintKey - the key corresponding to the hint to get.
Returns:
an object representing the value for the specified hint key. Some of the keys and their associated values are defined in the RenderingHints class.
See Also:
RenderingHints

setRenderingHints

public void setRenderingHints(Map hints)
Replaces the values of all preferences for the rendering algorithms with the specified hints. The existing values for all rendering hints are discarded and the new set of known hints and values are initialized from the specified Map object. Hint categories include controls for rendering quality and overall time/quality trade-off in the rendering process. Refer to the RenderingHints class for definitions of some common keys and values.

Specified by:
setRenderingHints in class Graphics2D
Parameters:
hints - the rendering hints to be set
See Also:
RenderingHints

addRenderingHints

public void addRenderingHints(Map hints)
Sets the values of an arbitrary number of preferences for the rendering algorithms. Only values for the rendering hints that are present in the specified Map object are modified. All other preferences not present in the specified object are left unmodified. Hint categories include controls for rendering quality and overall time/quality trade-off in the rendering process. Refer to the RenderingHints class for definitions of some common keys and values.

Specified by:
addRenderingHints in class Graphics2D
Parameters:
hints - the rendering hints to be set
See Also:
RenderingHints

getRenderingHints

public RenderingHints getRenderingHints()
Gets the preferences for the rendering algorithms. Hint categories include controls for rendering quality and overall time/quality trade-off in the rendering process. Returns all of the hint key/value pairs that were ever specified in one operation. Refer to the RenderingHints class for definitions of some common keys and values.

Specified by:
getRenderingHints in class Graphics2D
Returns:
a reference to an instance of RenderingHints that contains the current preferences.
See Also:
RenderingHints

translate

public void translate(double tx,
                      double ty)
Concatenates the current Graphics2D Transform with a translation transform. Subsequent rendering is translated by the specified distance relative to the previous position. This is equivalent to calling transform(T), where T is an AffineTransform represented by the following matrix:
          [   1    0    tx  ]
          [   0    1    ty  ]
          [   0    0    1   ]
 

Specified by:
translate in class Graphics2D
Parameters:
tx - the distance to translate along the x-axis
ty - the distance to translate along the y-axis

rotate

public void rotate(double theta)
Concatenates the current Graphics2D Transform with a rotation transform. Subsequent rendering is rotated by the specified radians relative to the previous origin. This is equivalent to calling transform(R), where R is an AffineTransform represented by the following matrix:
          [   cos(theta)    -sin(theta)    0   ]
          [   sin(theta)     cos(theta)    0   ]
          [       0              0         1   ]
 
Rotating with a positive angle theta rotates points on the positive x axis toward the positive y axis.

Specified by:
rotate in class Graphics2D
Parameters:
theta - the angle of rotation in radians

rotate

public void rotate(double theta,
                   double x,
                   double y)
Concatenates the current Graphics2D Transform with a translated rotation transform. Subsequent rendering is transformed by a transform which is constructed by translating to the specified location, rotating by the specified radians, and translating back by the same amount as the original translation. This is equivalent to the following sequence of calls:
          translate(x, y);
          rotate(theta);
          translate(-x, -y);
 
Rotating with a positive angle theta rotates points on the positive x axis toward the positive y axis.

Specified by:
rotate in class Graphics2D
Parameters:
theta - the angle of rotation in radians
x - the x coordinate of the origin of the rotation
y - the y coordinate of the origin of the rotation

scale

public void scale(double sx,
                  double sy)
Concatenates the current Graphics2D Transform with a scaling transformation Subsequent rendering is resized according to the specified scaling factors relative to the previous scaling. This is equivalent to calling transform(S), where S is an AffineTransform represented by the following matrix:
          [   sx   0    0   ]
          [   0    sy   0   ]
          [   0    0    1   ]
 

Specified by:
scale in class Graphics2D
Parameters:
sx - the amount by which X coordinates in subsequent rendering operations are multiplied relative to previous rendering operations.
sy - the amount by which Y coordinates in subsequent rendering operations are multiplied relative to previous rendering operations.

shear

public void shear(double shx,
                  double shy)
Concatenates the current Graphics2D Transform with a shearing transform. Subsequent renderings are sheared by the specified multiplier relative to the previous position. This is equivalent to calling transform(SH), where SH is an AffineTransform represented by the following matrix:
          [   1   shx   0   ]
          [  shy   1    0   ]
          [   0    0    1   ]
 

Specified by:
shear in class Graphics2D
Parameters:
shx - the multiplier by which coordinates are shifted in the positive X axis direction as a function of their Y coordinate
shy - the multiplier by which coordinates are shifted in the positive Y axis direction as a function of their X coordinate

transform

public void transform(AffineTransform Tx)
Composes an AffineTransform object with the Transform in this Graphics2D according to the rule last-specified-first-applied. If the current Transform is Cx, the result of composition with Tx is a new Transform Cx'. Cx' becomes the current Transform for this Graphics2D. Transforming a point p by the updated Transform Cx' is equivalent to first transforming p by Tx and then transforming the result by the original Transform Cx. In other words, Cx'(p) = Cx(Tx(p)). A copy of the Tx is made, if necessary, so further modifications to Tx do not affect rendering.

Specified by:
transform in class Graphics2D
Parameters:
Tx - the AffineTransform object to be composed with the current Transform
See Also:
setTransform(java.awt.geom.AffineTransform), AffineTransform

setTransform

public void setTransform(AffineTransform Tx)
Sets the Transform in the Graphics2D context.

Specified by:
setTransform in class Graphics2D
Parameters:
Tx - the AffineTransform object to be used in the rendering process
See Also:
transform(java.awt.geom.AffineTransform), AffineTransform

getTransform

public AffineTransform getTransform()
Returns a copy of the current Transform in the Graphics2D context.

Specified by:
getTransform in class Graphics2D
Returns:
the current AffineTransform in the Graphics2D context.
See Also:
transform(java.awt.geom.AffineTransform), setTransform(java.awt.geom.AffineTransform)

getPaint

public Paint getPaint()
Returns the current Paint of the Graphics2D context.

Specified by:
getPaint in class Graphics2D
Returns:
the current Graphics2D Paint, which defines a color or pattern.
See Also:
setPaint(java.awt.Paint), Graphics.setColor(java.awt.Color)

getComposite

public Composite getComposite()
Returns the current Composite in the Graphics2D context.

Specified by:
getComposite in class Graphics2D
Returns:
the current Graphics2D Composite, which defines a compositing style.
See Also:
setComposite(java.awt.Composite)

setBackground

public void setBackground(Color color)
Sets the background color for the Graphics2D context. The background color is used for clearing a region. When a Graphics2D is constructed for a Component, the background color is inherited from the Component. Setting the background color in the Graphics2D context only affects the subsequent clearRect calls and not the background color of the Component. To change the background of the Component, use appropriate methods of the Component.

Specified by:
setBackground in class Graphics2D
Parameters:
color - the background color that isused in subsequent calls to clearRect
See Also:
getBackground(), Graphics.clearRect(int, int, int, int)

getBackground

public Color getBackground()
Returns the background color used for clearing a region.

Specified by:
getBackground in class Graphics2D
Returns:
the current Graphics2D Color, which defines the background color.
See Also:
setBackground(java.awt.Color)

getStroke

public Stroke getStroke()
Returns the current Stroke in the Graphics2D context.

Specified by:
getStroke in class Graphics2D
Returns:
the current Graphics2D Stroke, which defines the line style.
See Also:
setStroke(java.awt.Stroke)

clip

public void clip(Shape s)
Intersects the current Clip with the interior of the specified Shape and sets the Clip to the resulting intersection. The specified Shape is transformed with the current Graphics2D Transform before being intersected with the current Clip. This method is used to make the current Clip smaller. To make the Clip larger, use setClip. The user clip modified by this method is independent of the clipping associated with device bounds and visibility. If no clip has previously been set, or if the clip has been cleared using setClip with a null argument, the specified Shape becomes the new user clip.

Specified by:
clip in class Graphics2D
Parameters:
s - the Shape to be intersected with the current Clip. If s is null, this method clears the current Clip.

getFontRenderContext

public FontRenderContext getFontRenderContext()
Get the rendering context of the Font within this Graphics2D context. The FontRenderContext encapsulates application hints such as anti-aliasing and fractional metrics, as well as target device specific information such as dots-per-inch. This information should be provided by the application when using objects that perform typographical formatting, such as Font and TextLayout. This information should also be provided by applications that perform their own layout and need accurate measurements of various characteristics of glyphs such as advance and line height when various rendering hints have been applied to the text rendering.

Specified by:
getFontRenderContext in class Graphics2D
Returns:
a reference to an instance of FontRenderContext.
Since:
JDK1.2
See Also:
FontRenderContext, Font.createGlyphVector(FontRenderContext,char[]), TextLayout

getGraphicContext

public GraphicContext getGraphicContext()
Returns:
the GraphicContext of this Graphics2D.


Copyright © 2008 Apache Software Foundation. All Rights Reserved.