de.slothsoft.charts.swt

Class SwtGraphicContext

java.lang.Object

de.slothsoft.charts.swt.SwtGraphicContext

All Implemented Interfaces:

GraphicContext

public class SwtGraphicContext
extends Object
implements GraphicContext

A GraphicContext implementation using the SWT GC to draw on whatever you like.

Since:

0.1.0

Author:

Stef Schulz

Constructor Summary

Constructors

Constructor and Description
SwtGraphicContext(org.eclipse.swt.graphics.GC delegate) Constructor.

Method Summary

Modifier and Type	Method and Description
Area	calculateTextSize(String text) Calculates the size of the text.
void	clip(Area rect) Restricts which area of the context can be used to drawn on.
SwtGraphicContext	delegate(org.eclipse.swt.graphics.GC newDelegate) Sets the GC.
void	dispose() Disposes of the operating system resources associated with this resource.
void	drawLine(double x1, double y1, double x2, double y2) Draws a simple line between two points.
void	drawPolyline(double[] x, double[] y) Paints the outline of a polyline.
void	drawText(double x, double y, String text) Paints the text on a position.
void	fillArc(double x, double y, double width, double height, double startAngle, double arcAngle) Draws the outline of a circular or elliptical arc covering the specified rectangle.
void	fillOval(double x, double y, double width, double height) Paints a filled oval.
void	fillPolygon(double[] x, double[] y) Paints a filled polygon.
void	fillRectangle(double x, double y, double width, double height) Paints a filled rectangle.
int	getColor() Returns the color as ARGB int, e.g.
org.eclipse.swt.graphics.GC	getDelegate() Returns the GC.
Font	getFont() Returns the font as an enum with the font properties as hints for the actual font used by the GUI.
void	scale(double x, double y) Scales the drawing canvas with the factor.
void	setColor(int colorAsInt) Sets the color as ARGB int, e.g.
void	setDelegate(org.eclipse.swt.graphics.GC delegate) Sets the GC.
void	setFont(Font fontAsEnum) Sets the font as an enum with the font properties as hints for the actual font used by the GUI.
void	translate(double x, double y) Moves the drawing canvas's origin to the new coordinates.

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.slothsoft.charts.GraphicContext

drawRectangle, drawRectangle, fillRectangle, scale

Constructor Detail

SwtGraphicContext

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

Constructor.

Parameters:

delegate - the GC to draw on; cannot be null

Method Detail

setColor

public void setColor(int colorAsInt)

Description copied from interface: GraphicContext

Sets the color as ARGB int, e.g. red is 0xFFFF0000 and blue is 0xFF0000FF.

Specified by:

setColor in interface GraphicContext

Parameters:

colorAsInt - the color

getColor

public int getColor()

Description copied from interface: GraphicContext

Returns the color as ARGB int, e.g. red is 0xFFFF0000 and blue is 0xFF0000FF.

Specified by:

getColor in interface GraphicContext

Returns:

the color

setFont

public void setFont(Font fontAsEnum)

Description copied from interface: GraphicContext

Sets the font as an enum with the font properties as hints for the actual font used by the GUI.

Specified by:

setFont in interface GraphicContext

Parameters:

fontAsEnum - the font

getFont

public Font getFont()

Description copied from interface: GraphicContext

Returns the font as an enum with the font properties as hints for the actual font used by the GUI.

Specified by:

getFont in interface GraphicContext

Returns:

the font

calculateTextSize

public Area calculateTextSize(String text)

Description copied from interface: GraphicContext

Calculates the size of the text.

Specified by:

calculateTextSize in interface GraphicContext

Returns:

the text size area

translate

public void translate(double x,
                      double y)

Description copied from interface: GraphicContext

Moves the drawing canvas's origin to the new coordinates.

Specified by:

translate in interface GraphicContext

Parameters:

x - translate x

y - translate y

scale

public void scale(double x,
                  double y)

Description copied from interface: GraphicContext

Scales the drawing canvas with the factor.

Specified by:

scale in interface GraphicContext

Parameters:

x - factor x

y - factor y

clip

public void clip(Area rect)

Description copied from interface: GraphicContext

Restricts which area of the context can be used to drawn on. Set to null to remove the restriction again.

Specified by:

clip in interface GraphicContext

Parameters:

rect - the clipping area

drawLine

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

Description copied from interface: GraphicContext

Draws a simple line between two points.

Specified by:

drawLine in interface GraphicContext

Parameters:

x1 - - start point x

y1 - - start point y

x2 - - end point x

y2 - - end point y

fillRectangle

public void fillRectangle(double x,
                          double y,
                          double width,
                          double height)

Description copied from interface: GraphicContext

Paints a filled rectangle.

Specified by:

fillRectangle in interface GraphicContext

Parameters:

x - the rectangle's x

y - the rectangle's y

width - the rectangle's width

height - the rectangle's height

drawPolyline

public void drawPolyline(double[] x,
                         double[] y)

Description copied from interface: GraphicContext

Paints the outline of a polyline.

Specified by:

drawPolyline in interface GraphicContext

Parameters:

x - the polygon's x coordinates

y - the polygon's y coordinates

See Also:

GraphicContext.fillPolygon(double[], double[])

fillPolygon

public void fillPolygon(double[] x,
                        double[] y)

Description copied from interface: GraphicContext

Paints a filled polygon.

Specified by:

fillPolygon in interface GraphicContext

Parameters:

x - the polygon's x coordinates

y - the polygon's y coordinates

See Also:

GraphicContext.drawPolyline(double[], double[])

drawText

public void drawText(double x,
                     double y,
                     String text)

Description copied from interface: GraphicContext

Paints the text on a position.

Specified by:

drawText in interface GraphicContext

Parameters:

x - the text's x

y - the text's y

fillOval

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

Description copied from interface: GraphicContext

Paints a filled oval.

Specified by:

fillOval in interface GraphicContext

Parameters:

x - the oval's x

y - the oval's y

width - the oval's width

height - the oval's height

fillArc

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

Description copied from interface: GraphicContext

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 (x, y) 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.

Specified by:

fillArc in interface GraphicContext

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.

dispose

public void dispose()

Disposes of the operating system resources associated with this resource. Applications must dispose of all resources which they allocate. This method does nothing if the resource is already disposed.

getDelegate

public org.eclipse.swt.graphics.GC getDelegate()

Returns the GC.

Returns:

the GC to draw on; never null

delegate

public SwtGraphicContext delegate(org.eclipse.swt.graphics.GC newDelegate)

Sets the GC.

Parameters:

newDelegate - the GC to draw on; cannot be null

Returns:

this instance

setDelegate

public void setDelegate(org.eclipse.swt.graphics.GC delegate)

Sets the GC.

Parameters:

delegate - the GC to draw on; cannot be null