StdDrawTest.zip_StdDraw_java源代码

/************************************************************************* * Compilation: javac StdDraw.java * Execution: java StdDraw * * Standard drawing library. This class provides a basic capability for * creating drawings with your programs. It uses a simple graphics model that * allows you to create drawings consisting of points, lines, and curves * in a window on your computer and to save the drawings to a file. * * Todo * ---- * - Add support for gradient fill, etc. * * Remarks * ------- * - don't use AffineTransform for rescaling since it inverts * images and strings * - careful using setFont in inner loop within an animation - * it can cause flicker * *************************************************************************/ import java.awt.*; import java.awt.event.*; import java.awt.geom.*; import java.awt.image.*; import java.io.*; import java.net.*; import java.util.LinkedList; import java.util.TreeSet; import javax.imageio.ImageIO; import javax.swing.*; /** * <i>Standard draw</i>. This class provides a basic capability for * creating drawings with your programs. It uses a simple graphics model that * allows you to create drawings consisting of points, lines, and curves * in a window on your computer and to save the drawings to a file. * <p> * For additional documentation, see <a href="http://introcs.cs.princeton.edu/15inout">Section 1.5</a> of * <i>Introduction to Programming in Java: An Interdisciplinary Approach</i> by Robert Sedgewick and Kevin Wayne. */ public final class StdDraw implements ActionListener, MouseListener, MouseMotionListener, KeyListener { // pre-defined colors public static final Color BLACK = Color.BLACK; public static final Color BLUE = Color.BLUE; public static final Color CYAN = Color.CYAN; public static final Color DARK_GRAY = Color.DARK_GRAY; public static final Color GRAY = Color.GRAY; public static final Color GREEN = Color.GREEN; public static final Color LIGHT_GRAY = Color.LIGHT_GRAY; public static final Color MAGENTA = Color.MAGENTA; public static final Color ORANGE = Color.ORANGE; public static final Color PINK = Color.PINK; public static final Color RED = Color.RED; public static final Color WHITE = Color.WHITE; public static final Color YELLOW = Color.YELLOW; /** * Shade of blue used in Introduction to Programming in Java. * It is Pantone 300U. The RGB values are approximately (9, 90, 166). */ public static final Color BOOK_BLUE = new Color( 9, 90, 166); public static final Color BOOK_LIGHT_BLUE = new Color(103, 198, 243); /** * Shade of red used in Algorithms 4th edition. * It is Pantone 1805U. The RGB values are approximately (150, 35, 31). */ public static final Color BOOK_RED = new Color(150, 35, 31); // default colors private static final Color DEFAULT_PEN_COLOR = BLACK; private static final Color DEFAULT_CLEAR_COLOR = WHITE; // current pen color private static Color penColor; // default canvas size is DEFAULT_SIZE-by-DEFAULT_SIZE private static final int DEFAULT_SIZE = 512; private static int width = DEFAULT_SIZE; private static int height = DEFAULT_SIZE; // default pen radius private static final double DEFAULT_PEN_RADIUS = 0.002; // current pen radius private static double penRadius; // show we draw immediately or wait until next show? private static boolean defer = false; // boundary of drawing canvas, 5% border private static final double BORDER = 0.05; private static final double DEFAULT_XMIN = 0.0; private static final double DEFAULT_XMAX = 1.0; private static final double DEFAULT_YMIN = 0.0; private static final double DEFAULT_YMAX = 1.0; private static double xmin, ymin, xmax, ymax; // for synchronization private static Object mouseLock = new Object(); private static Object keyLock = new Object(); // default font private static final Font DEFAULT_FONT = new Font("SansSerif", Font.PLAIN, 16); // current font private static Font font; // double buffered graphics private static BufferedImage offscreenImage, onscreenImage; private static Graphics2D offscreen, onscreen; // singleton for callbacks: avoids generation of extra .class files private static StdDraw std = new StdDraw(); // the frame for drawing to the screen private static JFrame frame; // mouse state private static boolean mousePressed = false; private static double mouseX = 0; private static double mouseY = 0; // queue of typed key characters private static LinkedList<Character> keysTyped = new LinkedList<Character>(); // set of key codes currently pressed down private static TreeSet<Integer> keysDown = new TreeSet<Integer>(); // singleton pattern: client can't instantiate private StdDraw() { } // static initializer static { init(); } /** * Set the window size to the default size 512-by-512 pixels. */ public static void setCanvasSize() { setCanvasSize(DEFAULT_SIZE, DEFAULT_SIZE); } /** * Set the window size to w-by-h pixels. * * @param w the width as a number of pixels * @param h the height as a number of pixels * @throws a RunTimeException if the width or height is 0 or negative */ public static void setCanvasSize(int w, int h) { if (w < 1 || h < 1) throw new RuntimeException("width and height must be positive"); width = w; height = h; init(); } // init private static void init() { if (frame != null) frame.setVisible(false); frame = new JFrame(); offscreenImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); onscreenImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); offscreen = offscreenImage.createGraphics(); onscreen = onscreenImage.createGraphics(); setXscale(); setYscale(); offscreen.setColor(DEFAULT_CLEAR_COLOR); offscreen.fillRect(0, 0, width, height); setPenColor(); setPenRadius(); setFont(); clear(); // add antialiasing RenderingHints hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); hints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY); offscreen.addRenderingHints(hints); // frame stuff ImageIcon icon = new ImageIcon(onscreenImage); JLabel draw = new JLabel(icon); draw.addMouseListener(std); draw.addMouseMotionListener(std); frame.setContentPane(draw); frame.addKeyListener(std); // JLabel cannot get keyboard focus frame.setResizable(false); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // closes all windows // frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); // closes only current window frame.setTitle("Standard Draw"); frame.setJMenuBar(createMenuBar()); frame.pack(); frame.requestFocusInWindow(); frame.setVisible(true); } // create the menu bar (changed to private) private static JMenuBar createMenuBar() { JMenuBar menuBar = new JMenuBar(); JMenu menu = new JMenu("File"); menuBar.add(menu); JMenuItem menuItem1 = new JMenuItem(" Save... "); menuItem1.addActionListener(std); menuItem1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask())); menu.add(menuItem1); return menuBar; } /*************************************************