Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 1 Chapter 4 2D Graphics: Advanced Topics

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 2 Objectives F To understand B-spline curves F To construct custom shape primitives F To apply basic image processing techniques F To create fractal images F To create 2D animation F To perform graphics printing

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 3 General Bezier Curve Bernstein basis

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 4 B-Spline Curve Normalized B-spline blending functions

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 5 B-Spline to Bezier Conversion Source Run

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 6 Shape Interface public boolean contains(Rectangle2D rect) public boolean contains(Point2D point) public boolean contains(double x, double y) public boolean contains(double x, double y, double w, double h) public Rectangle getBounds() public Rectangle2D getBounds2D() public PathIterator getPathIterator(AffineTransform at) public PathIterator getPathIterator(AffineTransform at, double flatness) public boolean intersects(Rectangle2D rect) public boolean intersects(double x, double y, double w, double h)

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 7 A Custom Primitive F Cannot extend the final class GeneralPath F Wrap a GeneralPath Source Run public class Heart implements Shape { GeneralPath path; public Heart(float x, float y, float w, float h) { path = new GeneralPath(); …

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 8 Image Processing F AWT – push model F Java 2D – immediate model F JAI – pull model

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 9 BufferedImage BufferedImage bi = new BufferedImage(300, 400, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = (Graphics2D)(bi.createGraphics()); g2.drawImage(image, 0, 0, new Component() {}); BufferedImage bi = ImageIO.read(file); Create Read Display

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 10 Operators Source Run

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 11 Raster and WritableRaster int[] getPixel(int x, int y, int[] data) float[] getPixel(int x, int y, float[] data) double[] getPixel(int x, int y, double[] data) int[] getPixels(int x, int y, int w, int h, int[] data) float[] getPixels(int x, int y, int w, int h, float[] data) double[] getPixels(int x, int y, int w, int h, double[] data) void setPixel(int x, int y, int[] data) void setPixel(int x, int y, float[] data) void setPixel(int x, int y, double[] data) void setPixels(int x, int y, int w, int h, int[] data) void setPixels(int x, int y, int w, int h, float[] data) void setPixels(int x, int y, int w, int h, double[] data)

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 12 Mandelbrot Set Source Run Iterations on the complex plane

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 13 Animation: Multi-threading Source Outline of a typical multi-threading animation Run public void paintComponent(Graphics g) { } public void run() { while(true) { repaint(); try { Thread.sleep(sleepTime); } catch (InterruptedException ex) {} }

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 14 Animation: Timer SourceRun Timer timer = new Timer(period, listener); timer.start(); public void actionPerformed(ActionEvent event) { } Outline of an animation with Timer

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 15 Cellular Automata SourceRun The iteration of the system proceeds by assigning the next state of each cell based on the previous configuration. Each cell follows the same set of rules and the new state depends only upon the current states of the same cell and its neighbors. Example: A cell is black if exactly one of its neighbors in the current configuration is black

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 16 Printing F PrintJob –getPrintJob –printDialog –setPrintable –print F Printable –Print F PageFormat –getOrientation –getWidth –getHeight –getImageableX –getImageableY –getImageableWidth –getImageableHeight SourceRun