/* * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Oracle or the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ import java.awt.*; import java.awt.event.*; import java.applet.Applet; import java.awt.image.*; /* * This applet allows the user to move a texture painted rectangle around the applet * window. The rectangle flickers and draws slowly because this applet does not use * double buffering. */ public class ShapeMover extends Applet{ static protected Label label; public void init(){ setLayout(new BorderLayout()); add(new SMCanvas()); label = new Label("Drag rectangle around within the area"); add("South", label); } public static void main(String s[]) { Frame f = new Frame("ShapeMover"); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) {System.exit(0);} }); Applet applet = new ShapeMover(); f.add("Center", applet); applet.init(); f.pack(); f.setSize(new Dimension(550,250)); f.setVisible(true); } } class SMCanvas extends Canvas implements MouseListener, MouseMotionListener{ Rectangle rect = new Rectangle(0, 0, 100, 50); BufferedImage bi; Graphics2D big; // Holds the coordinates of the user's last mousePressed event. int last_x, last_y; boolean firstTime = true; TexturePaint fillPolka, strokePolka; Rectangle area; // True if the user pressed, dragged or released the mouse outside of the rectangle; false otherwise. boolean pressOut = false; public SMCanvas(){ setBackground(Color.white); addMouseMotionListener(this); addMouseListener(this); // Creates the fill texture paint pattern. bi = new BufferedImage(5, 5, BufferedImage.TYPE_INT_RGB); big = bi.createGraphics(); big.setColor(Color.pink); big.fillRect(0, 0, 7, 7); big.setColor(Color.cyan); big.fillOval(0, 0, 3, 3); Rectangle r = new Rectangle(0,0,5,5); fillPolka = new TexturePaint(bi, r); big.dispose(); //Creates the stroke texture paint pattern. bi = new BufferedImage(5, 5, BufferedImage.TYPE_INT_RGB); big = bi.createGraphics(); big.setColor(Color.cyan); big.fillRect(0, 0, 7, 7); big.setColor(Color.pink); big.fillOval(0, 0, 3, 3); r = new Rectangle(0,0,5,5); strokePolka = new TexturePaint(bi, r); big.dispose(); } // Handles the event of the user pressing down the mouse button. public void mousePressed(MouseEvent e){ last_x = rect.x - e.getX(); last_y = rect.y - e.getY(); // Checks whether or not the cursor is inside of the rectangle while the user is pressing the mouse. if(rect.contains(e.getX(), e.getY())) updateLocation(e); else { ShapeMover.label.setText("First position the cursor on the rectangle and then drag."); pressOut = true; } } // Handles the event of a user dragging the mouse while holding down the mouse button. public void mouseDragged(MouseEvent e){ if(!pressOut) updateLocation(e); else ShapeMover.label.setText("First position the cursor on the rectangle and then drag."); } // Handles the event of a user releasing the mouse button. public void mouseReleased(MouseEvent e){ // Checks whether or not the cursor is inside of the rectangle when the user releases the mouse button. if(rect.contains(e.getX(), e.getY())) updateLocation(e); else { ShapeMover.label.setText("First position the cursor on the rectangle and then drag."); pressOut = false; } } // This method required by MouseListener. public void mouseMoved(MouseEvent e){} // These methods are required by MouseMotionListener. public void mouseClicked(MouseEvent e){} public void mouseExited(MouseEvent e){} public void mouseEntered(MouseEvent e){} // Updates the coordinates representing the location of the current rectangle. public void updateLocation(MouseEvent e){ rect.setLocation(last_x + e.getX(), last_y + e.getY()); /* * Updates the label to reflect the location of the * current rectangle * if checkRect returns true; otherwise, returns error message. */ if (checkRect()) { ShapeMover.label.setText("Rectangle located at " + rect.getX() + ", " + rect.getY()); } else { ShapeMover.label.setText("Please don't try to "+ " drag outside the area."); } repaint(); } public void paint(Graphics g){ update(g); } public void update(Graphics g){ Graphics2D g2 = (Graphics2D)g; Dimension dim = getSize(); int w = (int)dim.getWidth(); int h = (int)dim.getHeight(); g2.setStroke(new BasicStroke(8.0f)); if(firstTime){ area = new Rectangle(dim); rect.setLocation(w/2-50, h/2-25); firstTime = false; } // Clears the rectangle that was previously drawn. g2.setPaint(Color.white); g2.fillRect(0, 0, w, h); // Draws and fills the newly positioned rectangle. g2.setPaint(strokePolka); g2.draw(rect); g2.setPaint(fillPolka); g2.fill(rect); } /* * Checks if the rectangle is contained within the applet window. If the rectangle * is not contained withing the applet window, it is redrawn so that it is adjacent * to the edge of the window and just inside the window. */ boolean checkRect(){ if (area == null) { return false; } if(area.contains(rect.x, rect.y, 100, 50)){ return true; } int new_x = rect.x; int new_y = rect.y; if((rect.x+100)>area.getWidth()){ new_x = (int)area.getWidth()-99; } if(rect.x < 0){ new_x = -1; } if((rect.y+50)>area.getHeight()){ new_y = (int)area.getHeight()-49; } if(rect.y < 0){ new_y = -1; } rect.setLocation(new_x, new_y); return false; } }