/* * @(#)Stars3D.java 1.3 98/12/03 * * Copyright 1998 by Sun Microsystems, Inc., * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A. * All rights reserved. * * This software is the confidential and proprietary information * of Sun Microsystems, Inc. ("Confidential Information"). You * shall not disclose such Confidential Information and shall use * it only in accordance with the terms of the license agreement * you entered into with Sun. */ import java.awt.*; import java.awt.event.*; import java.awt.geom.*; import java.awt.font.FontRenderContext; import javax.swing.*; /** * The Stars3D class generates a 3D text shape with GeneralPath, renders a * number of small multi-colored rectangles and then renders the * 3D text shape. */ public class Stars3D extends JApplet { public void init() { Demo demo = new Demo(); getContentPane().add(demo); getContentPane().add("North", new DemoControls(demo)); } static class Demo extends JPanel { // the colors of the stars private static Color colors[] = { Color.red, Color.green, Color.white }; private static AffineTransform at = AffineTransform.getTranslateInstance(-5, -5); private Shape shape, tshape; private Shape ribbon; public int fontSize = 100; public String text = "J2D"; public int numStars = 300; public Demo() { setBackground(Color.black); } public void drawDemo(int w, int h, Graphics2D g2) { Rectangle2D rect = new Rectangle2D.Double(); /* * sets the color of each star, randomly sets their location * and renders them */ for (int i = 0; i < numStars; i++) { g2.setColor(colors[i%3]); g2.setComposite(AlphaComposite.getInstance( AlphaComposite.SRC_OVER, (float) Math.random())); rect.setRect(w*Math.random(), h*Math.random(),2,2); g2.fill(rect); } FontRenderContext frc = g2.getFontRenderContext(); Font font = new Font("serif.bolditalic", Font.PLAIN, fontSize); /* * gets the outline shape of the glyph vector created * from the current font and String */ shape = font.createGlyphVector(frc, text).getOutline(); // creates a shape transformed with the current transform tshape = at.createTransformedShape(shape); // gets a PathIterator that iterates the boundary of shape PathIterator pi = shape.getPathIterator(null); float seg[] = new float[6]; float tseg[] = new float[6]; GeneralPath working = new GeneralPath(GeneralPath.WIND_NON_ZERO); float x=0, y=0; // Current point on the path float tx=0, ty=0; // Transformed path point float cx=0, cy=0; // Last moveTo point, for SEG_CLOSE float tcx=0, tcy=0; // Transformed last moveTo point /* * iterates through the Shape and builds the ribbon * by adding GeneralPath objects */ while(!pi.isDone()) { int segType = pi.currentSegment(seg); switch(segType) { case PathIterator.SEG_MOVETO: at.transform(seg, 0, tseg, 0, 1); x = seg[0]; y = seg[1]; tx = tseg[0]; ty = tseg[1]; cx = x; cy = y; tcx = tx; tcy = ty; break; case PathIterator.SEG_LINETO: at.transform(seg, 0, tseg, 0, 1); if (Line2D.relativeCCW(x, y, tx, ty, seg[0], seg[1]) < 0) { working.moveTo(x, y); working.lineTo(seg[0], seg[1]); working.lineTo(tseg[0], tseg[1]); working.lineTo(tx, ty); working.lineTo(x, y); } else { working.moveTo(x, y); working.lineTo(tx, ty); working.lineTo(tseg[0], tseg[1]); working.lineTo(seg[0], seg[1]); working.lineTo(x, y); } x = seg[0]; y = seg[1]; tx = tseg[0]; ty = tseg[1]; break; case PathIterator.SEG_QUADTO: at.transform(seg, 0, tseg, 0, 2); if (Line2D.relativeCCW(x, y, tx, ty, seg[2], seg[3]) < 0) { working.moveTo(x, y); working.quadTo(seg[0], seg[1], seg[2], seg[3]); working.lineTo(tseg[2], tseg[3]); working.quadTo(tseg[0], tseg[1], tx, ty); working.lineTo(x, y); } else { working.moveTo(x, y); working.lineTo(tx, ty); working.quadTo(tseg[0], tseg[1], tseg[2], tseg[3]); working.lineTo(seg[2], seg[3]); working.quadTo(seg[0], seg[1], x, y); } x = seg[2]; y = seg[3]; tx = tseg[2]; ty = tseg[3]; break; case PathIterator.SEG_CUBICTO: at.transform(seg, 0, tseg, 0, 3); if (Line2D.relativeCCW(x, y, tx, ty, seg[4], seg[5]) < 0) { working.moveTo(x, y); working.curveTo(seg[0], seg[1], seg[2], seg[3], seg[4], seg[5]); working.lineTo(tseg[4], tseg[5]); working.curveTo(tseg[2], tseg[3], tseg[0], tseg[1], tx, ty); working.lineTo(x, y); } else { working.moveTo(x, y); working.lineTo(tx, ty); working.curveTo(tseg[0], tseg[1], tseg[2], tseg[3], tseg[4], tseg[5]); working.lineTo(seg[4], seg[5]); working.curveTo(seg[2], seg[3], seg[0], seg[1], x, y); } x = seg[4]; y = seg[5]; tx = tseg[4]; ty = tseg[5]; break; case PathIterator.SEG_CLOSE: if (Line2D.relativeCCW(x, y, tx, ty, cx, cy) < 0) { working.moveTo(x, y); working.lineTo(cx, cy); working.lineTo(tcx, tcy); working.lineTo(tx, ty); working.lineTo(x, y); } else { working.moveTo(x, y); working.lineTo(tx, ty); working.lineTo(tcx, tcy); working.lineTo(cx, cy); working.lineTo(x, y); } x = cx; y = cy; tx = tcx; ty = tcy; } pi.next(); } // while ribbon = working; g2.setComposite(AlphaComposite.SrcOver); Rectangle r = shape.getBounds(); g2.translate(w*.5-r.width*.5,h*.5+r.height*.5); // fills the transformed shape with blue g2.setColor(Color.blue); g2.fill(tshape); /* * fills the shape producing the 3D effect with a * partially opaque white color */ g2.setColor(new Color(255, 255, 255, 200)); g2.fill(ribbon); // fills the untransformed shape with white g2.setColor(Color.white); g2.fill(shape); // strokes the outline of shape with blue g2.setColor(Color.blue); g2.draw(shape); } public void paint(Graphics g) { Graphics2D g2 = (Graphics2D) g; Dimension d = getSize(); g2.setBackground(getBackground()); g2.clearRect(0, 0, d.width, d.height); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); drawDemo(d.width, d.height, g2); } } // End Demo class /** * The DemoControls class adds controls for entering a string * to be rendered and for entering the size of that string. */ static class DemoControls extends JPanel implements ActionListener { Demo demo; JTextField tf1, tf2; public DemoControls(Demo demo) { this.demo = demo; setBackground(Color.gray); JLabel l = new JLabel(" Text:"); l.setForeground(Color.black); add(l); add(tf1 = new JTextField(demo.text)); tf1.setPreferredSize(new Dimension(60,20)); tf1.addActionListener(this); l = new JLabel(" Size:"); l.setForeground(Color.black); add(l); add(tf2 = new JTextField(String.valueOf(demo.fontSize))); tf2.setPreferredSize(new Dimension(30,20)); tf2.addActionListener(this); } public void actionPerformed(ActionEvent e) { try { if (e.getSource().equals(tf1)) { demo.text = tf1.getText().trim(); } else if (e.getSource().equals(tf2)) { demo.fontSize = Integer.parseInt(tf2.getText().trim()); if (demo.fontSize < 10) { demo.fontSize = 10; } } demo.repaint(); } catch (Exception ex) {} } } // End DemoControls class public static void main(String argv[]) { final Stars3D demo = new Stars3D(); demo.init(); JFrame f = new JFrame("Java 2D(TM) Demo - Stars3D"); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) {System.exit(0);} }); f.getContentPane().add("Center", demo); f.pack(); f.setSize(new Dimension(400,300)); f.show(); } }