Standard Widget Toolkit for GTK 3.125.0 · org.eclipse.swt.graphics.GC

Modifier and Type	Field and Description
pack-priv static final int	BACKGROUND
pack-priv static final int	BACKGROUND_BG
private double[]	cairoTransformationMatrix The current Cairo matrix, which positions widgets in the shell.
private Rectangle	clipping Original clipping set on this GC
private double[]	currentTransform Tracks the last transformation with which `setTransform(Transform)` was called, so that we can answer clients of `getTransform(Transform)`.
pack-priv GCData	data
pack-priv static final int	DRAW
pack-priv static final int	DRAW_OFFSET
pack-priv Drawable	drawable
pack-priv static final int	FILL
pack-priv static final int	FONT
pack-priv static final int	FOREGROUND
public long	handle the handle to the OS device context (Warning: This field is platform dependent) Important Note This field is not part of the SWT public API.
pack-priv static final int	LINE_CAP
pack-priv static final float[]	LINE_DASH
pack-priv static final float[]	LINE_DASH_ZERO
pack-priv static final float[]	LINE_DASHDOT
pack-priv static final float[]	LINE_DASHDOT_ZERO
pack-priv static final float[]	LINE_DASHDOTDOT
pack-priv static final float[]	LINE_DASHDOTDOT_ZERO
pack-priv static final float[]	LINE_DOT
pack-priv static final float[]	LINE_DOT_ZERO
pack-priv static final int	LINE_JOIN
pack-priv static final int	LINE_MITERLIMIT
pack-priv static final int	LINE_STYLE
pack-priv static final int	LINE_WIDTH

Access	Constructor and Description
pack-priv	GC()
public	GC(Drawable the drawable to draw on drawable) Constructs a new instance of this class which has been configured to draw on the specified drawable.
public	GC(Drawable the drawable to draw on drawable, int the style of GC to construct style) Constructs a new instance of this class which has been configured to draw on the specified drawable.

Method Summary

Modifier and Type	Method and Description
pack-priv static void	addCairoString(long cairo, String string, float x, float y, Font font)
pack-priv void	cairoClipRegion(long the cairo context to apply the region to cairo) Convenience method that applies a region to the Control using cairo_clip.
pack-priv void	checkGC(int mask)
pack-priv int	Returns: If only one style is specified, it is return unmodified. If both styles are specified, returns LEFT_TO_RIGHT checkStyle(int the SWT style bit string style) Ensure that the style specified is either LEFT_TO_RIGHT or RIGHT_TO_LEFT.
pack-priv void	computeStringSize()
pack-priv long	convertRgn(long rgn, double[] matrix)
public void	copyArea(Image the image to copy into image, int the x coordinate in the receiver of the area to be copied x, int the y coordinate in the receiver of the area to be copied y) Copies a rectangular area of the receiver at the specified position into the image, which must be of type `SWT.BITMAP`.
public void	copyArea(int the x coordinate in the receiver of the area to be copied srcX, int the y coordinate in the receiver of the area to be copied srcY, int the width of the area to copy width, int the height of the area to copy height, int the x coordinate in the receiver of the area to copy to destX, int the y coordinate in the receiver of the area to copy to destY) Copies a rectangular area of the receiver at the source position onto the receiver at the destination position.
public void	copyArea(int the x coordinate in the receiver of the area to be copied srcX, int the y coordinate in the receiver of the area to be copied srcY, int the width of the area to copy width, int the height of the area to copy height, int the x coordinate in the receiver of the area to copy to destX, int the y coordinate in the receiver of the area to copy to destY, boolean if `true` paint events will be generated for old and obscured areas paint) Copies a rectangular area of the receiver at the source position onto the receiver at the destination position.
pack-priv void	copyAreaInPixels(Image image, int x, int y)
pack-priv void	copyAreaInPixels(int srcX, int srcY, int width, int height, int destX, int destY)
pack-priv void	copyAreaInPixels(int srcX, int srcY, int width, int height, int destX, int destY, boolean paint)
pack-priv void	createLayout()
pack-priv void	destroy() Overrides org.eclipse.swt.graphics.Resource.destroy.
pack-priv void	disposeLayout()
public void	drawArc(int the x coordinate of the upper-left corner of the arc to be drawn x, int the y coordinate of the upper-left corner of the arc to be drawn y, int the width of the arc to be drawn width, int the height of the arc to be drawn height, int the beginning angle startAngle, int the angular extent of the arc, relative to the start angle arcAngle) Draws the outline of a circular or elliptical arc within the specified rectangular area.
pack-priv void	drawArcInPixels(int x, int y, int width, int height, int startAngle, int arcAngle)
public void	drawFocus(int the x coordinate of the rectangle x, int the y coordinate of the rectangle y, int the width of the rectangle width, int the height of the rectangle height) Draws a rectangle, based on the specified arguments, which has the appearance of the platform's focus rectangle if the platform supports such a notion, and otherwise draws a simple rectangle in the receiver's foreground color.
pack-priv void	drawFocusInPixels(int x, int y, int width, int height)
public void	drawImage(Image the image to draw image, int the x coordinate of where to draw x, int the y coordinate of where to draw y) Draws the given image in the receiver at the specified coordinates.
public void	drawImage(Image the source image image, int the x coordinate in the source image to copy from srcX, int the y coordinate in the source image to copy from srcY, int the width in points to copy from the source srcWidth, int the height in points to copy from the source srcHeight, int the x coordinate in the destination to copy to destX, int the y coordinate in the destination to copy to destY, int the width in points of the destination rectangle destWidth, int the height in points of the destination rectangle destHeight) Copies a rectangular area from the source image into a (potentially different sized) rectangular area in the receiver.
pack-priv void	drawImage(Image srcImage, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight, boolean simple)
pack-priv void	drawImageInPixels(Image image, int x, int y)
public void	drawLine(int the first point's x coordinate x1, int the first point's y coordinate y1, int the second point's x coordinate x2, int the second point's y coordinate y2) Draws a line, using the foreground color, between the points (`x1`, `y1`) and (`x2`, `y2`).
pack-priv void	drawLineInPixels(int x1, int y1, int x2, int y2)
public void	drawOval(int the x coordinate of the upper left corner of the oval to be drawn x, int the y coordinate of the upper left corner of the oval to be drawn y, int the width of the oval to be drawn width, int the height of the oval to be drawn height) Draws the outline of an oval, using the foreground color, within the specified rectangular area.
pack-priv void	drawOvalInPixels(int x, int y, int width, int height)
public void	drawPath(Path the path to draw path) Draws the path described by the parameter.
public void	drawPoint(int the point's x coordinate x, int the point's y coordinate y) Draws an SWT logical point, using the foreground color, at the specified point (`x`, `y`).
pack-priv void	drawPointInPixels(int x, int y)
public void	drawPolygon(int[] an array of alternating x and y values which are the vertices of the polygon pointArray) Draws the closed polygon which is defined by the specified array of integer coordinates, using the receiver's foreground color.
pack-priv void	drawPolygonInPixels(int[] pointArray)
public void	drawPolyline(int[] an array of alternating x and y values which are the corners of the polyline pointArray) Draws the polyline which is defined by the specified array of integer coordinates, using the receiver's foreground color.
pack-priv void	drawPolyline(long cairo, int[] pointArray, boolean close)
pack-priv void	drawPolylineInPixels(int[] pointArray)
public void	drawRectangle(int the x coordinate of the rectangle to be drawn x, int the y coordinate of the rectangle to be drawn y, int the width of the rectangle to be drawn width, int the height of the rectangle to be drawn height) Draws the outline of the rectangle specified by the arguments, using the receiver's foreground color.
public void	drawRectangle(Rectangle the rectangle to draw rect) Draws the outline of the specified rectangle, using the receiver's foreground color.
pack-priv void	drawRectangleInPixels(int x, int y, int width, int height)
pack-priv void	drawRectangleInPixels(Rectangle rect)
public void	drawRoundRectangle(int the x coordinate of the rectangle to be drawn x, int the y coordinate of the rectangle to be drawn y, int the width of the rectangle to be drawn width, int the height of the rectangle to be drawn height, int the width of the arc arcWidth, int the height of the arc arcHeight) Draws the outline of the round-cornered rectangle specified by the arguments, using the receiver's foreground color.
pack-priv void	drawRoundRectangleInPixels(int x, int y, int width, int height, int arcWidth, int arcHeight)
public void	drawString(String the string to be drawn string, int the x coordinate of the top left corner of the rectangular area where the string is to be drawn x, int the y coordinate of the top left corner of the rectangular area where the string is to be drawn y) Draws the given string, using the receiver's current font and foreground color.
public void	drawString(String the string to be drawn string, int the x coordinate of the top left corner of the rectangular area where the string is to be drawn x, int the y coordinate of the top left corner of the rectangular area where the string is to be drawn y, boolean if `true` the background will be transparent, otherwise it will be opaque isTransparent) Draws the given string, using the receiver's current font and foreground color.
pack-priv void	drawStringInPixels(String string, int x, int y)
pack-priv void	drawStringInPixels(String string, int x, int y, boolean isTransparent)
public void	drawText(String the string to be drawn string, int the x coordinate of the top left corner of the rectangular area where the text is to be drawn x, int the y coordinate of the top left corner of the rectangular area where the text is to be drawn y) Draws the given string, using the receiver's current font and foreground color.
public void	drawText(String the string to be drawn string, int the x coordinate of the top left corner of the rectangular area where the text is to be drawn x, int the y coordinate of the top left corner of the rectangular area where the text is to be drawn y, boolean if `true` the background will be transparent, otherwise it will be opaque isTransparent) Draws the given string, using the receiver's current font and foreground color.
public void	drawText(String the string to be drawn string, int the x coordinate of the top left corner of the rectangular area where the text is to be drawn x, int the y coordinate of the top left corner of the rectangular area where the text is to be drawn y, int the flags specifying how to process the text flags) Draws the given string, using the receiver's current font and foreground color.
pack-priv void	drawTextInPixels(String string, int x, int y)
pack-priv void	drawTextInPixels(String string, int x, int y, boolean isTransparent)
pack-priv void	drawTextInPixels(String string, int x, int y, int flags)
public boolean	Returns: `true` if the object is the same as this object and `false` otherwise equals(Object the object to compare with this object object) Overrides java.lang.Object.equals. Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.
public void	fillArc(int the x coordinate of the upper-left corner of the arc to be filled x, int the y coordinate of the upper-left corner of the arc to be filled y, int the width of the arc to be filled width, int the height of the arc to be filled height, int the beginning angle startAngle, int the angular extent of the arc, relative to the start angle arcAngle) Fills the interior of a circular or elliptical arc within the specified rectangular area, with the receiver's background color.
pack-priv void	fillArcInPixels(int x, int y, int width, int height, int startAngle, int arcAngle)
public void	fillGradientRectangle(int the x coordinate of the rectangle to be filled x, int the y coordinate of the rectangle to be filled y, int the width of the rectangle to be filled, may be negative (inverts direction of gradient if horizontal) width, int the height of the rectangle to be filled, may be negative (inverts direction of gradient if vertical) height, boolean if true sweeps from top to bottom, else sweeps from left to right vertical) Fills the interior of the specified rectangle with a gradient sweeping from left to right or top to bottom progressing from the receiver's foreground color to its background color.
pack-priv void	fillGradientRectangleInPixels(int x, int y, int width, int height, boolean vertical)
public void	fillOval(int the x coordinate of the upper left corner of the oval to be filled x, int the y coordinate of the upper left corner of the oval to be filled y, int the width of the oval to be filled width, int the height of the oval to be filled height) Fills the interior of an oval, within the specified rectangular area, with the receiver's background color.
pack-priv void	fillOvalInPixels(int x, int y, int width, int height)
public void	fillPath(Path the path to fill path) Fills the path described by the parameter.
public void	fillPolygon(int[] an array of alternating x and y values which are the vertices of the polygon pointArray) Fills the interior of the closed polygon which is defined by the specified array of integer coordinates, using the receiver's background color.
pack-priv void	fillPolygonInPixels(int[] pointArray)
public void	fillRectangle(int the x coordinate of the rectangle to be filled x, int the y coordinate of the rectangle to be filled y, int the width of the rectangle to be filled width, int the height of the rectangle to be filled height) Fills the interior of the rectangle specified by the arguments, using the receiver's background color.
public void	fillRectangle(Rectangle the rectangle to be filled rect) Fills the interior of the specified rectangle, using the receiver's background color.
pack-priv void	fillRectangleInPixels(int x, int y, int width, int height)
pack-priv void	fillRectangleInPixels(Rectangle rect)
public void	fillRoundRectangle(int the x coordinate of the rectangle to be filled x, int the y coordinate of the rectangle to be filled y, int the width of the rectangle to be filled width, int the height of the rectangle to be filled height, int the width of the arc arcWidth, int the height of the arc arcHeight) Fills the interior of the round-cornered rectangle specified by the arguments, using the receiver's background color.
pack-priv void	fillRoundRectangleInPixels(int x, int y, int width, int height, int arcWidth, int arcHeight)
pack-priv int	fixMnemonic(char[] buffer)
public boolean	Returns: the advanced value getAdvanced() Returns `true` if receiver is using the operating system's advanced graphics subsystem.
public int	Returns: the distance in the x direction to move past the character before painting the next getAdvanceWidth(char the character to measure ch) Returns the advance width of the specified character in the font which is currently selected into the receiver.
public int	Returns: the alpha value getAlpha() Returns the receiver's alpha value.
public int	Returns: the anti-aliasing setting getAntialias() Returns the receiver's anti-aliasing setting value, which will be one of `SWT.DEFAULT`, `SWT.OFF` or `SWT.ON`.
public Color	Returns: the receiver's background color getBackground() Returns the background color.
public Pattern	Returns: the receiver's background pattern getBackgroundPattern() Returns the background pattern.
public int	Returns: the width of the character getCharWidth(char the character to measure ch) Returns the width of the specified character in the font selected into the receiver.
public Rectangle	Returns: the bounding rectangle of the clipping region getClipping() Returns the bounding rectangle of the receiver's clipping region.
public void	getClipping(Region the region to fill with the clipping region region) Sets the region managed by the argument to the current clipping region of the receiver.
pack-priv Rectangle	getClippingInPixels()
public int	Returns: the receiver's fill rule getFillRule() Returns the receiver's fill rule, which will be one of `SWT.FILL_EVEN_ODD` or `SWT.FILL_WINDING`.
public Font	Returns: the receiver's font getFont() Returns the font currently being used by the receiver to draw and measure text.
public FontMetrics	Returns: font metrics for the receiver's font getFontMetrics() Returns a FontMetrics which contains information about the font currently being used by the receiver to draw and measure text.
public Color	Returns: the color used for drawing foreground things getForeground() Returns the receiver's foreground color.
public Pattern	Returns: the receiver's foreground pattern getForegroundPattern() Returns the foreground pattern.
public GCData	Returns: the receiver's GCData getGCData() Returns the GCData.
public int	Returns: the receiver's interpolation setting getInterpolation() Returns the receiver's interpolation setting, which will be one of `SWT.DEFAULT`, `SWT.NONE`, `SWT.LOW` or `SWT.HIGH`.
public LineAttributes	Returns: the line attributes used for drawing lines getLineAttributes() Returns the receiver's line attributes.
pack-priv LineAttributes	getLineAttributesInPixels()
public int	Returns: the cap style used for drawing lines getLineCap() Returns the receiver's line cap style, which will be one of the constants `SWT.CAP_FLAT`, `SWT.CAP_ROUND`, or `SWT.CAP_SQUARE`.
public int[]	Returns: the line dash style used for drawing lines getLineDash() Returns the receiver's line dash style.
public int	Returns: the join style used for drawing lines getLineJoin() Returns the receiver's line join style, which will be one of the constants `SWT.JOIN_MITER`, `SWT.JOIN_ROUND`, or `SWT.JOIN_BEVEL`.
public int	Returns: the style used for drawing lines getLineStyle() Returns the receiver's line style, which will be one of the constants `SWT.LINE_SOLID`, `SWT.LINE_DASH`, `SWT.LINE_DOT`, `SWT.LINE_DASHDOT` or `SWT.LINE_DASHDOTDOT`.
public int	Returns: the receiver's line width getLineWidth() Returns the width that will be used when drawing lines for all of the figure drawing operations (that is, `drawLine`, `drawRectangle`, `drawPolyline`, and so forth.
pack-priv int	getLineWidthInPixels()
pack-priv void	getSize(int[] width, int[] height)
public int	Returns: the style bits getStyle() Returns the receiver's style information.
public int	Returns: the anti-aliasing setting getTextAntialias() Returns the receiver's text drawing anti-aliasing setting value, which will be one of `SWT.DEFAULT`, `SWT.OFF` or `SWT.ON`.
public void	getTransform(Transform the destination to copy the transform into transform) Sets the parameter to the transform that is currently being used by the receiver.
private static Rectangle	getTransformedClippingRectangle(int[] pointsArray)
public boolean	Returns: `true` true if the receiver is in XOR mode, and false otherwise getXORMode() Returns `true` if this GC is drawing in the mode where the resulting color in the destination is the exclusive or of the color values in the source and the destination, and `false` if it is drawing in the mode where the destination color is being replaced with the source color value.
public static GC	Returns: a new `GC` gtk_new(long the handle to the OS device context handle, GCData the data for the receiver. data) Invokes platform specific functionality to wrap a graphics context.
public static GC	Returns: a new `GC` gtk_new(Drawable the Drawable for the receiver. drawable, GCData the data for the receiver. data) Invokes platform specific functionality to allocate a new graphics context.
public int	Returns: the receiver's hash hashCode() Overrides java.lang.Object.hashCode. Returns an integer hash code for the receiver.
private static boolean	hasNoRotation(double[] matrix)
pack-priv double[]	identity()
pack-priv void	init(Drawable drawable, GCData data, long gdkGC)
pack-priv void	initCairo()
public boolean	Returns: `true` if the GC has a clipping region, and `false` otherwise isClipped() Returns `true` if the receiver has a clipping region set into it, and `false` otherwise.
public boolean	Returns: `true` when the GC is disposed and `false` otherwise isDisposed() Implements abstract org.eclipse.swt.graphics.Resource.isDisposed. Returns `true` if the GC has been disposed, and `false` otherwise.
pack-priv boolean	isIdentity(double[] matrix)
private void	limitClipping(long gcClipping) Intersects given clipping with original clipping of this context, so that resulting clip does not allow to paint outside of the GC bounds.
private void	resetClipping()
public void	setAdvanced(boolean the new advanced graphics state advanced) Sets the receiver to always use the operating system's advanced graphics subsystem for all graphics operations if the argument is `true`.
public void	setAlpha(int the alpha value alpha) Sets the receiver's alpha value which must be between 0 (transparent) and 255 (opaque).
public void	setAntialias(int the anti-aliasing setting antialias) Sets the receiver's anti-aliasing value to the parameter, which must be one of `SWT.DEFAULT`, `SWT.OFF` or `SWT.ON`.
public void	setBackground(Color the new background color for the receiver color) Sets the background color.
public void	setBackgroundPattern(Pattern the new background pattern pattern) Sets the background pattern.
pack-priv void	setCairoClip(long damageRgn, long clipRgn)
pack-priv static void	setCairoFont(long cairo, Font font)
pack-priv static void	setCairoFont(long cairo, long font)
pack-priv static void	setCairoPatternColor(long pattern, int offset, Color c, int alpha)
pack-priv static void	setCairoRegion(long cairo, long rgn)
pack-priv void	setClipping(long clipRgn)
public void	setClipping(int the x coordinate of the clipping rectangle x, int the y coordinate of the clipping rectangle y, int the width of the clipping rectangle width, int the height of the clipping rectangle height) Sets the area of the receiver which can be changed by drawing operations to the rectangular area specified by the arguments.
public void	setClipping(Path the clipping path. path) Sets the area of the receiver which can be changed by drawing operations to the path specified by the argument.
public void	setClipping(Rectangle the clipping rectangle or `null` rect) Sets the area of the receiver which can be changed by drawing operations to the rectangular area specified by the argument.
public void	setClipping(Region the clipping region or `null` region) Sets the area of the receiver which can be changed by drawing operations to the region specified by the argument.
pack-priv void	setClippingInPixels(int x, int y, int width, int height)
pack-priv void	setClippingInPixels(Rectangle rect)
public void	setFillRule(int the new fill rule rule) Sets the receiver's fill rule to the parameter, which must be one of `SWT.FILL_EVEN_ODD` or `SWT.FILL_WINDING`.
public void	setFont(Font the new font for the receiver, or null to indicate a default font font) Sets the font which will be used by the receiver to draw and measure text to the argument.
public void	setForeground(Color the new foreground color for the receiver color) Sets the foreground color.
public void	setForegroundPattern(Pattern the new foreground pattern pattern) Sets the foreground pattern.
public void	setInterpolation(int the new interpolation setting interpolation) Sets the receiver's interpolation setting to the parameter, which must be one of `SWT.DEFAULT`, `SWT.NONE`, `SWT.LOW` or `SWT.HIGH`.
public void	setLineAttributes(LineAttributes the line attributes attributes) Sets the receiver's line attributes.
pack-priv void	setLineAttributesInPixels(LineAttributes attributes)
public void	setLineCap(int the cap style to be used for drawing lines cap) Sets the receiver's line cap style to the argument, which must be one of the constants `SWT.CAP_FLAT`, `SWT.CAP_ROUND`, or `SWT.CAP_SQUARE`.
public void	setLineDash(int[] the dash style to be used for drawing lines dashes) Sets the receiver's line dash style to the argument.
public void	setLineJoin(int the join style to be used for drawing lines join) Sets the receiver's line join style to the argument, which must be one of the constants `SWT.JOIN_MITER`, `SWT.JOIN_ROUND`, or `SWT.JOIN_BEVEL`.
public void	setLineStyle(int the style to be used for drawing lines lineStyle) Sets the receiver's line style to the argument, which must be one of the constants `SWT.LINE_SOLID`, `SWT.LINE_DASH`, `SWT.LINE_DOT`, `SWT.LINE_DASHDOT` or `SWT.LINE_DASHDOTDOT`.
public void	setLineWidth(int the width of a line lineWidth) Sets the width that will be used when drawing lines for all of the figure drawing operations (that is, `drawLine`, `drawRectangle`, `drawPolyline`, and so forth.
pack-priv void	setLineWidthInPixels(int lineWidth)
pack-priv void	setString(String string, int flags)
public void	setTextAntialias(int the anti-aliasing setting antialias) Sets the receiver's text anti-aliasing value to the parameter, which must be one of `SWT.DEFAULT`, `SWT.OFF` or `SWT.ON`.
public void	setTransform(Transform the transform to set transform) Sets the transform that is currently being used by the receiver.
public void	setXORMode(boolean if `true`, then xor mode is used, otherwise source copy mode is used xor) If the argument is `true`, puts the receiver in a drawing mode where the resulting color in the destination is the exclusive or of the color values in the source and the destination, and if the argument is `false`, puts the receiver in a drawing mode where the destination color is replaced with the source color value.
public Point	Returns: a point containing the extent of the string stringExtent(String the string to measure string) Returns the extent of the given string.
pack-priv Point	stringExtentInPixels(String string)
public Point	Returns: a point containing the extent of the string textExtent(String the string to measure string) Returns the extent of the given string.
public Point	Returns: a point containing the extent of the string textExtent(String the string to measure string, int the flags specifying how to process the text flags) Returns the extent of the given string.
pack-priv Point	textExtentInPixels(String string)
pack-priv Point	textExtentInPixels(String string, int flags)
public String	Returns: a string representation of the receiver toString() Overrides java.lang.Object.toString. Returns a string containing a concise, human-readable description of the receiver.
private static int[]	Returns: transformed x,y coordinates. transformPoints(double[] transformation, Point[] points) Transforms x,y coordinate pairs with given matrix
private static int[]	Returns: transformed rectangle corner coordinates, with x,y order of points. transformRectangle(double[] affineTransformation, Rectangle rectangle) Transforms rectangle with given matrix

Inherited from org.eclipse.swt.graphics.Resource:: dispose getDevice ignoreNonDisposed init initNonDisposeTracking setNonDisposeHandler

public final Class GC

Field Summary

Constructor Summary

Method Summary