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Graphics Programming with the Java 2D API

Nov 22, 2002

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Java Media APIs: Cross-Platform Imaging, Media and Visualization

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Clipping

The clipping path is a state attribute that specifies which part of a shape is to be rendered. In order to specify the clipping region, a path (see Listing 3.2 for the definition of a path) is created such that only the parts of the shape within the path are rendered. The clipping region can be specified by any valid Shape (for example, a GeneralPath or Rectangle2D). For example, a simple clipping path could be used in the myCustomRenderer class in our basic java graphics program recipe by adding the following:

GeneralPath gp = new GeneralPath();
gp.moveTo((50,50); //initial starting point
gp.lineTo(30,200);
gp.lineTo(110,140);
gp.lineTo(90,190);
gp.lineTo(300,50);
gp.closePath();

g2.setClip(gp);
g2.setColor(new GradientPaint();
g2.fill(new Rectangle2D.float(0.f,0.f,500.f,500.f);

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