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The Java Developers Almanac 1.4 |
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e669. Drawing on a Buffered ImageTo draw on a buffered image, create a graphics context on the buffered image. // Create a graphics context on the buffered image
Graphics2D g2d = bimage.createGraphics();
// Draw on the image
g2d.setColor(Color.red);
g2d.fill(new Ellipse2D.Float(0, 0, 200, 100));
g2d.dispose();
If the buffered image supports transparency,
(see e661 Determining If an Image Has Transparent Pixels),
pixels can be made transparent:
g2d = bimage.createGraphics();
// Make all filled pixels transparent
Color transparent = new Color(0, 0, 0, 0);
g2d.setColor(transparent);
g2d.setComposite(AlphaComposite.Src);
g2d.fill(new Rectangle2D.Float(20, 20, 100, 20));
g2d.dispose();
e667. Creating a Buffered Image from an Image e668. Creating a Buffered Image from an Array of Color-Indexed Pixel Values e670. Converting a Buffered Image to an Image e671. Getting and Setting Pixels in a Buffered Image e672. Scaling, Shearing, Translating, and Rotating a Buffered Image
© 2002 Addison-Wesley. |