edu.uci.ics.jung.visualization.swt.graphics
Class GCGraphicsContext

java.lang.Object
  edu.uci.ics.jung.visualization.swt.graphics.GCGraphicsContext

All Implemented Interfaces:

GraphicsContext

public class GCGraphicsContext
extends Object
implements GraphicsContext

An adapter that translates invokations of the GraphicsContext interface to the necessary invokations on its org.eclipse.swt.graphics.GC delegate. Special thanks to the developers of the Holongate project, http://www.holongate.org, for helping me get started in the right direction.

Author:

Jason A Wrang

Field Summary

protected org.eclipse.swt.graphics.GC

delegate

Constructor Summary

GCGraphicsContext()

GCGraphicsContext(org.eclipse.swt.graphics.GC delegate)

Method Summary

void	clearRect(int x, int y, int width, int height)
void	clip(Shape s)
void	clipRect(int x, int y, int width, int height)
void	copyArea(int x, int y, int width, int height, int dx, int dy)
Image	createImage(int width, int height)
Label	createLabel()
void	dispose()
void	draw(Shape s)
void	drawArc(int x, int y, int width, int height, int startAngle, int arcAngle)
void	drawChars(char[] data, int offset, int length, int x, int y)
void	drawImage(Image img, AffineTransform xform)
void	drawImage(Image img, int x, int y)
void	drawLabel(Label label, int x, int y)
void	drawLabel(Label label, int x, int y, int w, int h)
void	drawLine(int x1, int y1, int x2, int y2)
void	drawOval(int x, int y, int width, int height)
void	drawPolygon(int[] xPoints, int[] yPoints, int nPoints)
void	drawPolygon(Polygon p)
void	drawPolyline(int[] xPoints, int[] yPoints, int nPoints)
void	drawRect(int x, int y, int width, int height)
void	drawRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight)
void	drawString(String s, float x, float y)
void	drawString(String str, int x, int y)
void	fill(Shape s)
void	fillArc(int x, int y, int width, int height, int startAngle, int arcAngle)
void	fillOval(int x, int y, int width, int height)
void	fillPolygon(int[] xPoints, int[] yPoints, int nPoints)
void	fillPolygon(Polygon p)
void	fillRect(int x, int y, int width, int height)
void	fillRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight)
Boolean	getAntialiasing()
Color	getBackground()
int	getCharWidth(char c)
Shape	getClip()
Rectangle	getClipBounds()
Rectangle	getClipBounds(Rectangle r)
Color	getColor()
Font	getFont()
int	getFontAscent()
int	getFontDescent()
int	getFontHeight()
Paint	getPaint()
int	getStringWidth(String str)
Stroke	getStroke()
static org.eclipse.swt.graphics.FontData	getSWTFontData(org.eclipse.swt.graphics.Device dev, Font font)
Boolean	getTextAntialiasing()
AffineTransform	getTransform()
boolean	hit(Rectangle rect, Shape s, boolean onStroke)
void	setAntialiasing(Boolean on)
void	setBackground(Color color)
void	setClip(int x, int y, int width, int height)
void	setClip(Shape clip)
void	setColor(Color color)
void	setFont(Font font)
void	setPaint(Paint paint)
void	setStroke(Stroke s)
void	setTextAntialiasing(Boolean on)
void	setTransform(AffineTransform tx)
static Color	toAWTColor(org.eclipse.swt.graphics.GC gc, org.eclipse.swt.graphics.Color rgb) Converts an SWT Color into an AWT Color.
static Font	toAWTFont(org.eclipse.swt.graphics.Device dev, org.eclipse.swt.graphics.Font font)
static AffineTransform	toAWTTransform(org.eclipse.swt.graphics.Transform t)
static org.eclipse.swt.graphics.Path	toPath(org.eclipse.swt.graphics.Device dev, Shape s) Converts a Java2D Shape into an SWT Path object.
org.eclipse.swt.graphics.Color	toSWTColor(Color color) Converts an AWT Color into an SWT Color.
org.eclipse.swt.graphics.Font	toSWTFont(Font font) Font size in Java2D is expressed in pixels??? The javadoc says that font sizes are in points!
static org.eclipse.swt.graphics.Transform	toSWTTransform(org.eclipse.swt.graphics.Device dev, AffineTransform t) Converts a Java2D AffineTransform into an SWT Transform.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

delegate

protected org.eclipse.swt.graphics.GC delegate

Constructor Detail

GCGraphicsContext

public GCGraphicsContext()

GCGraphicsContext

public GCGraphicsContext(org.eclipse.swt.graphics.GC delegate)

Method Detail

dispose

public void dispose()

Specified by:

dispose in interface GraphicsContext

toSWTTransform

public static org.eclipse.swt.graphics.Transform toSWTTransform(org.eclipse.swt.graphics.Device dev,
                                                                AffineTransform t)

Converts a Java2D AffineTransform into an SWT Transform.

The caller must call dispose() on the returned instance.

This method is not static because the returned transform is bound to the same Device as the orginal GC this instance represents.

Parameters:

t - The Java2D affine transform

Returns:

An SWT Transform initialized with the affine transform values

toAWTTransform

public static AffineTransform toAWTTransform(org.eclipse.swt.graphics.Transform t)

toAWTColor

public static Color toAWTColor(org.eclipse.swt.graphics.GC gc,
                               org.eclipse.swt.graphics.Color rgb)

Converts an SWT Color into an AWT Color.

The returned Color have its alpha channel set to the current alpha value of the GC. As a consequence, colors cannot be cached or resused.

Parameters:

rgb - The SWT color

Returns:

The AWT color

toSWTColor

public org.eclipse.swt.graphics.Color toSWTColor(Color color)

Converts an AWT Color into an SWT Color.

The alpha channel of the AWT color is lost in the process.

The caller must call dispose() on the returned instance.

This method is not static because the returned color is bound to the same Device as the orginal GC this instance represents.

Parameters:

rgba -

Returns:

toPath

public static org.eclipse.swt.graphics.Path toPath(org.eclipse.swt.graphics.Device dev,
                                                   Shape s)

Converts a Java2D Shape into an SWT Path object.

Coordinates are supposed to be expressed in the original (untransformed) user space following the Java2D convention for coordinates.

This method uses the PathIterator mechanism to iterate over the shape.

The caller must call dispose() on the returned instance.

This method is not static because the returned path is bound to the same Device as the orginal GC this instance represents.

Parameters:

s - The Shape to convert

Returns:

The equivalent Path

getSWTFontData

public static org.eclipse.swt.graphics.FontData getSWTFontData(org.eclipse.swt.graphics.Device dev,
                                                               Font font)

toSWTFont

public org.eclipse.swt.graphics.Font toSWTFont(Font font)

Font size in Java2D is expressed in pixels??? The javadoc says that font sizes are in points!

Font size is converted in points by multiplying AWT font size by 72/ screen DPI.

toAWTFont

public static Font toAWTFont(org.eclipse.swt.graphics.Device dev,
                             org.eclipse.swt.graphics.Font font)

getCharWidth

public int getCharWidth(char c)

Specified by:

getCharWidth in interface GraphicsContext

getFontAscent

public int getFontAscent()

Specified by:

getFontAscent in interface GraphicsContext

getFontDescent

public int getFontDescent()

Specified by:

getFontDescent in interface GraphicsContext

getFontHeight

public int getFontHeight()

Specified by:

getFontHeight in interface GraphicsContext

getStringWidth

public int getStringWidth(String str)

Specified by:

getStringWidth in interface GraphicsContext

getAntialiasing

public Boolean getAntialiasing()

Specified by:

getAntialiasing in interface GraphicsContext

getTextAntialiasing

public Boolean getTextAntialiasing()

Specified by:

getTextAntialiasing in interface GraphicsContext

setAntialiasing

public void setAntialiasing(Boolean on)

Specified by:

setAntialiasing in interface GraphicsContext

setTextAntialiasing

public void setTextAntialiasing(Boolean on)

Specified by:

setTextAntialiasing in interface GraphicsContext

createLabel

public Label createLabel()

Specified by:

createLabel in interface GraphicsContext

createImage

public Image createImage(int width,
                         int height)

Specified by:

createImage in interface GraphicsContext

clearRect

public void clearRect(int x,
                      int y,
                      int width,
                      int height)

Specified by:

clearRect in interface GraphicsContext

clip

public void clip(Shape s)

Specified by:

clip in interface GraphicsContext

clipRect

public void clipRect(int x,
                     int y,
                     int width,
                     int height)

Specified by:

clipRect in interface GraphicsContext

copyArea

public void copyArea(int x,
                     int y,
                     int width,
                     int height,
                     int dx,
                     int dy)

Specified by:

copyArea in interface GraphicsContext

draw

public void draw(Shape s)

Specified by:

draw in interface GraphicsContext

drawArc

public void drawArc(int x,
                    int y,
                    int width,
                    int height,
                    int startAngle,
                    int arcAngle)

Specified by:

drawArc in interface GraphicsContext

drawChars

public void drawChars(char[] data,
                      int offset,
                      int length,
                      int x,
                      int y)

Specified by:

drawChars in interface GraphicsContext

drawImage

public void drawImage(Image img,
                      int x,
                      int y)

Specified by:

drawImage in interface GraphicsContext

drawImage

public void drawImage(Image img,
                      AffineTransform xform)

Specified by:

drawImage in interface GraphicsContext

drawLabel

public void drawLabel(Label label,
                      int x,
                      int y,
                      int w,
                      int h)

Specified by:

drawLabel in interface GraphicsContext

drawLabel

public void drawLabel(Label label,
                      int x,
                      int y)

Specified by:

drawLabel in interface GraphicsContext

drawLine

public void drawLine(int x1,
                     int y1,
                     int x2,
                     int y2)

Specified by:

drawLine in interface GraphicsContext

drawOval

public void drawOval(int x,
                     int y,
                     int width,
                     int height)

Specified by:

drawOval in interface GraphicsContext

drawPolygon

public void drawPolygon(int[] xPoints,
                        int[] yPoints,
                        int nPoints)

Specified by:

drawPolygon in interface GraphicsContext

drawPolygon

public void drawPolygon(Polygon p)

Specified by:

drawPolygon in interface GraphicsContext

drawPolyline

public void drawPolyline(int[] xPoints,
                         int[] yPoints,
                         int nPoints)

Specified by:

drawPolyline in interface GraphicsContext

drawRect

public void drawRect(int x,
                     int y,
                     int width,
                     int height)

Specified by:

drawRect in interface GraphicsContext

drawRoundRect

public void drawRoundRect(int x,
                          int y,
                          int width,
                          int height,
                          int arcWidth,
                          int arcHeight)

Specified by:

drawRoundRect in interface GraphicsContext

drawString

public void drawString(String s,
                       float x,
                       float y)

Specified by:

drawString in interface GraphicsContext

drawString

public void drawString(String str,
                       int x,
                       int y)

Specified by:

drawString in interface GraphicsContext

fill

public void fill(Shape s)

Specified by:

fill in interface GraphicsContext

fillArc

public void fillArc(int x,
                    int y,
                    int width,
                    int height,
                    int startAngle,
                    int arcAngle)

Specified by:

fillArc in interface GraphicsContext

fillOval

public void fillOval(int x,
                     int y,
                     int width,
                     int height)

Specified by:

fillOval in interface GraphicsContext

fillPolygon

public void fillPolygon(int[] xPoints,
                        int[] yPoints,
                        int nPoints)

Specified by:

fillPolygon in interface GraphicsContext

fillPolygon

public void fillPolygon(Polygon p)

Specified by:

fillPolygon in interface GraphicsContext

fillRect

public void fillRect(int x,
                     int y,
                     int width,
                     int height)

Specified by:

fillRect in interface GraphicsContext

fillRoundRect

public void fillRoundRect(int x,
                          int y,
                          int width,
                          int height,
                          int arcWidth,
                          int arcHeight)

Specified by:

fillRoundRect in interface GraphicsContext

getBackground

public Color getBackground()

Specified by:

getBackground in interface GraphicsContext

getClip

public Shape getClip()

Specified by:

getClip in interface GraphicsContext

getClipBounds

public Rectangle getClipBounds()

Specified by:

getClipBounds in interface GraphicsContext

getClipBounds

public Rectangle getClipBounds(Rectangle r)

Specified by:

getClipBounds in interface GraphicsContext

getFont

public Font getFont()

Specified by:

getFont in interface GraphicsContext

getColor

public Color getColor()

Specified by:

getColor in interface GraphicsContext

getStroke

public Stroke getStroke()

Specified by:

getStroke in interface GraphicsContext

getTransform

public AffineTransform getTransform()

Specified by:

getTransform in interface GraphicsContext

hit

public boolean hit(Rectangle rect,
                   Shape s,
                   boolean onStroke)

Specified by:

hit in interface GraphicsContext

setBackground

public void setBackground(Color color)

Specified by:

setBackground in interface GraphicsContext

setClip

public void setClip(int x,
                    int y,
                    int width,
                    int height)

Specified by:

setClip in interface GraphicsContext

setClip

public void setClip(Shape clip)

Specified by:

setClip in interface GraphicsContext

setFont

public void setFont(Font font)

Specified by:

setFont in interface GraphicsContext

setColor

public void setColor(Color color)

Specified by:

setColor in interface GraphicsContext

setStroke

public void setStroke(Stroke s)

Specified by:

setStroke in interface GraphicsContext

setTransform

public void setTransform(AffineTransform tx)

Specified by:

setTransform in interface GraphicsContext

getPaint

public Paint getPaint()

Specified by:

getPaint in interface GraphicsContext

setPaint

public void setPaint(Paint paint)

Specified by:

setPaint in interface GraphicsContext