Example Depot

// Instantiate this class and then use the draw() method to draw the // generated on the graphics context. class Mandelbrot { // Dimension of the image int width; int height; // Holds the generated image Image image; public Mandelbrot(int width, int height) { // Initialize with default location this(width, height, new Rectangle2D.Float(-2.0f, -1.2f, 3.2f, 2.4f)); } public Mandelbrot(int width, int height, Rectangle2D.Float loc) { // Initialize color model generateColorModel(); this.width = width; this.height = height; image = Toolkit.getDefaultToolkit().createImage( new MemoryImageSource(width, height, colorModel, generatePixels(width, height, loc), 0, width)); } public void draw(Graphics g, int x, int y) { g.drawImage(image, x, y, null); } private byte[] generatePixels(int w, int h, Rectangle2D.Float loc) { float xmin = loc.x; float ymin = loc.y; float xmax = loc.x+loc.width; float ymax = loc.y+loc.height; byte[] pixels = new byte[w * h]; int pIx = 0; float[] p = new float[w]; float q = ymin; float dp = (xmax-xmin)/w; float dq = (ymax-ymin)/h; p[0] = xmin; for (int i=1; i<w; i++) { p[i] = p[i-1] + dp; } for (int r=0; r<h; r++) { for (int c=0; c<w; c++) { int color = 1; float x = 0.0f; float y = 0.0f; float xsqr = 0.0f; float ysqr = 0.0f; do { xsqr = x*x; ysqr = y*y; y = 2*x*y + q; x = xsqr - ysqr + p[c]; color++; } while (color < 512 && xsqr + ysqr < 4); pixels[pIx++] = (byte)(color % 16); } q += dq; } return pixels; } // 16-color model ColorModel colorModel; private void generateColorModel() { // Generate 16-color model byte[] r = new byte[16]; byte[] g = new byte[16]; byte[] b = new byte[16]; r[0] = 0; g[0] = 0; b[0] = 0; r[1] = 0; g[1] = 0; b[1] = (byte)192; r[2] = 0; g[2] = 0; b[2] = (byte)255; r[3] = 0; g[3] = (byte)192; b[3] = 0; r[4] = 0; g[4] = (byte)255; b[4] = 0; r[5] = 0; g[5] = (byte)192; b[5] = (byte)192; r[6] = 0; g[6] = (byte)255; b[6] = (byte)255; r[7] = (byte)192; g[7] = 0; b[7] = 0; r[8] = (byte)255; g[8] = 0; b[8] = 0; r[9] = (byte)192; g[9] = 0; b[9] = (byte)192; r[10] = (byte)255; g[10] = 0; b[10] = (byte)255; r[11] = (byte)192; g[11] = (byte)192; b[11] = 0; r[12] = (byte)255; g[12] = (byte)255; b[12] = 0; r[13] = (byte)80; g[13] = (byte)80; b[13] = (byte)80; r[14] = (byte)192; g[14] = (byte)192; b[14] = (byte)192; r[15] = (byte)255; g[15] = (byte)255; b[15] = (byte)255; colorModel = new IndexColorModel(4, 16, r, g, b); } }

class MyCanvas extends Canvas { Mandelbrot mandelbrot; MyCanvas() { // Add a listener for resize events addComponentListener(new ComponentAdapter() { // This method is called when the component's size changes public void componentResized(ComponentEvent evt) { Component c = (Component)evt.getSource(); // Get new size Dimension newSize = c.getSize(); // Regenerate the image mandelbrot = new Mandelbrot(newSize.width, newSize.height); c.repaint(); } }); } public void paint(Graphics g) { if (mandelbrot != null) { mandelbrot.draw(g, 0, 0); } } }