Java tutorial
package org.jfree.graphics2d.demo; import java.awt.Color; import java.awt.GradientPaint; import java.awt.Graphics2D; import java.awt.LinearGradientPaint; import java.awt.MultipleGradientPaint; import java.awt.MultipleGradientPaint.CycleMethod; import java.awt.RadialGradientPaint; import java.awt.Rectangle; import java.awt.geom.AffineTransform; import java.awt.geom.Ellipse2D; import java.awt.geom.Path2D; import java.awt.geom.Rectangle2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import org.jfree.graphics2d.svg.SVGGraphics2D; import org.jfree.graphics2d.svg.SVGUtils; /** * * @author dgilbert */ public class ImageTest { private static void drawClipTest(Graphics2D g2) { g2.translate(10, 20); g2.setColor(Color.RED); g2.fillRect(10, 10, 100, 100); g2.clip(new Rectangle(0, 0, 60, 60)); g2.setPaint(Color.BLUE); g2.fillRect(10, 10, 100, 100); g2.setClip(null); g2.setPaint(Color.GREEN); g2.fillRect(60, 60, 50, 50); } private static void drawGradientPaintTest(Graphics2D g2) { g2.setPaint(new GradientPaint(10f, 10f, Color.RED, 10f, 60f, Color.YELLOW)); g2.fillRect(10, 10, 50, 50); g2.setPaint(Color.BLUE); g2.fillRect(60, 10, 50, 50); } private static void drawLinearGradientPaintTest(Graphics2D g2) { // top left LinearGradientPaint lgp = new LinearGradientPaint(10, 30, 50, 30, new float[] { 0.0f, 1.0f }, new Color[] { Color.RED, Color.BLUE }); g2.setPaint(lgp); g2.fill(new Rectangle2D.Double(10, 10, 40, 40)); // top right lgp = new LinearGradientPaint(80, 10, 80, 50, new float[] { 0.0f, 1.0f }, new Color[] { Color.RED, Color.BLUE }); g2.setPaint(lgp); g2.fill(new Rectangle2D.Double(60, 10, 40, 40)); // bottom left lgp = new LinearGradientPaint(10, 100, 50, 60, new float[] { 0.0f, 1.0f }, new Color[] { Color.RED, Color.BLUE }); g2.setPaint(lgp); g2.fill(new Rectangle2D.Double(10, 60, 40, 40)); // bottom right lgp = new LinearGradientPaint(70, 70, 90, 90, new float[] { 0.0f, 0.5f, 1.0f }, new Color[] { Color.RED, Color.YELLOW, Color.BLUE }, CycleMethod.REPEAT); g2.setPaint(lgp); g2.fill(new Rectangle2D.Double(60, 60, 40, 40)); } private static void drawOldLinearGradientPaintTest(Graphics2D g2) { // top left GradientPaint lgp = new GradientPaint(10, 30, Color.RED, 50, 30, Color.BLUE); g2.setPaint(lgp); g2.fill(new Rectangle2D.Double(10, 10, 40, 40)); // top right lgp = new GradientPaint(80, 10, Color.RED, 80, 50, Color.BLUE); g2.setPaint(lgp); g2.fill(new Rectangle2D.Double(60, 10, 40, 40)); // bottom left lgp = new GradientPaint(10, 100, Color.RED, 50, 60, Color.BLUE); g2.setPaint(lgp); g2.fill(new Rectangle2D.Double(10, 60, 40, 40)); // bottom right lgp = new GradientPaint(70, 70, Color.RED, 90, 90, Color.BLUE); g2.setPaint(lgp); g2.fill(new Rectangle2D.Double(60, 60, 40, 40)); } private static void drawRadialGradientPaintTest(Graphics2D g2) { RadialGradientPaint rgp = new RadialGradientPaint(50, 50, 40, 30, 30, new float[] { 0f, 0.75f, 1f }, new Color[] { Color.RED, Color.GREEN, Color.BLUE }, MultipleGradientPaint.CycleMethod.NO_CYCLE); g2.setPaint(rgp); Ellipse2D circle = new Ellipse2D.Double(10, 10, 80, 80); g2.fill(circle); } private static void drawArcTest(Graphics2D g2) { g2.setPaint(Color.GREEN); g2.drawRect(0, 20, 70, 50); g2.setPaint(Color.RED); Path2D path1 = new Path2D.Double(); double[] pts = calculateReferenceArc(90); path1.moveTo(pts[0], pts[1]); path1.curveTo(pts[2], pts[3], pts[4], pts[5], pts[6], pts[7]); AffineTransform t = new AffineTransform(); t.translate(35, 45); t.scale(35, 25); t.rotate(Math.PI / 4); path1.transform(t); g2.draw(path1); Path2D path2 = new Path2D.Double(); path2.moveTo(pts[0], pts[1]); path2.curveTo(pts[2], pts[3], pts[4], pts[5], pts[6], pts[7]); AffineTransform t2 = new AffineTransform(); t2.rotate(3 * Math.PI / 4); t2.scale(35, 25); t2.translate(35, 35); path2.transform(t2); //g2.draw(path2); Path2D arc = new Path2D.Double(); arc.append(path1, false); arc.append(path2, false); //g2.draw(arc); //g2.draw(path1); //g2.transform(t); g2.setPaint(Color.BLUE); g2.drawArc(0, 20, 70, 50, 0, -270); //Arc2D arc2d = new Arc2D.Double(0d, 20d, 70d, 50d, 0d, 90, Arc2D.OPEN); //g2.draw(arc2d); } private static double[] calculateReferenceArc(double angle) { double a = (angle / 180 * Math.PI) / 2.0; double x0 = Math.cos(a); double y0 = Math.sin(a); double x1 = (4 - x0) / 3; double y1 = (1 - x0) * (3 - x0) / (3 * y0); double x2 = x1; double y2 = -y1; double x3 = x0; double y3 = -y0; return new double[] { x0, y0, x1, y1, x2, y2, x3, y3 }; } /** * Starting point for the demo. * * @param args ignored. * * @throws IOException */ public static void main(String[] args) throws IOException { // BufferedImage image = new BufferedImage(200, 200, // BufferedImage.TYPE_INT_ARGB); // Graphics2D g2 = image.createGraphics(); SVGGraphics2D g2 = new SVGGraphics2D(110, 110); //drawClipTest(g2); //drawGradientPaintTest(g2); drawLinearGradientPaintTest(g2); //drawOldLinearGradientPaintTest(g2); //drawRadialGradientPaintTest(g2); //drawArcTest(g2); // ImageIO.write(image, "png", new File("oldlgp-test.png")); SVGUtils.writeToSVG(new File("lgp-test.svg"), g2.getSVGElement()); } }