deleted example code
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knut
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/* From http://java.sun.com/docs/books/tutorial/index.html */
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/*
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* SelectionDemo.java is a 1.4 application that requires one other file:
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* images/starfield.gif
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*/
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package album.editor;
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import javax.swing.BoxLayout;
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import javax.swing.ImageIcon;
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import javax.swing.JFrame;
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import javax.swing.JLabel;
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import javax.swing.event.MouseInputAdapter;
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import java.awt.*;
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import java.awt.event.MouseEvent;
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/*
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* This displays an image. When the user drags within the image, this program
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* displays a rectangle and a string indicating the bounds of the rectangle.
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*/
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public class SelectionDemo {
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JLabel label;
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static String starFile = "/home/knut/src/album/photos/forkalsrud-ca-1951.jpg";
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private void buildUI(Container container, ImageIcon image) {
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container.setLayout(new BoxLayout(container, BoxLayout.PAGE_AXIS));
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SelectionArea area = new SelectionArea(image, this);
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container.add(area);
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label = new JLabel("Drag within the image.");
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label.setLabelFor(area);
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container.add(label);
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//Align the left edges of the components.
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area.setAlignmentX(Component.LEFT_ALIGNMENT);
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label.setAlignmentX(Component.LEFT_ALIGNMENT); //redundant
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}
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public void updateLabel(Rectangle rect) {
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int width = rect.width;
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int height = rect.height;
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//Make the coordinates look OK if a dimension is 0.
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if (width == 0) {
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width = 1;
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}
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if (height == 0) {
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height = 1;
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}
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label.setText("Rectangle goes from (" + rect.x + ", " + rect.y
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+ ") to (" + (rect.x + width - 1) + ", "
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+ (rect.y + height - 1) + ").");
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}
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/** Returns an ImageIcon, or null if the path was invalid. */
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protected static ImageIcon createImageIcon(String path) {
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return new ImageIcon(path, "description");
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}
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/**
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* Create the GUI and show it. For thread safety, this method should be
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* invoked from the event-dispatching thread.
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*/
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private static void createAndShowGUI() {
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//Make sure we have nice window decorations.
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JFrame.setDefaultLookAndFeelDecorated(true);
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//Create and set up the window.
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JFrame frame = new JFrame("SelectionDemo");
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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//Set up the content pane.
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SelectionDemo controller = new SelectionDemo();
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controller.buildUI(frame.getContentPane(), createImageIcon(starFile));
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//Display the window.
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frame.pack();
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frame.setVisible(true);
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}
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public static void main(String[] args) {
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//Schedule a job for the event-dispatching thread:
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//creating and showing this application's GUI.
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javax.swing.SwingUtilities.invokeLater(new Runnable() {
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public void run() {
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createAndShowGUI();
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}
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});
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}
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private class SelectionArea extends JLabel {
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Rectangle currentRect = null;
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Rectangle rectToDraw = null;
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Rectangle previousRectDrawn = new Rectangle();
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SelectionDemo controller;
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public SelectionArea(ImageIcon image, SelectionDemo controller) {
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super(image); //This component displays an image.
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this.controller = controller;
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setOpaque(true);
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setMinimumSize(new Dimension(10, 10)); //don't hog space
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MyListener myListener = new MyListener();
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addMouseListener(myListener);
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addMouseMotionListener(myListener);
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}
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private class MyListener extends MouseInputAdapter {
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public void mousePressed(MouseEvent e) {
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int x = e.getX();
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int y = e.getY();
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currentRect = new Rectangle(x, y, 0, 0);
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updateDrawableRect(getWidth(), getHeight());
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repaint();
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}
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public void mouseDragged(MouseEvent e) {
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updateSize(e);
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}
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public void mouseReleased(MouseEvent e) {
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updateSize(e);
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}
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/*
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* Update the size of the current rectangle and call repaint.
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* Because currentRect always has the same origin, translate it if
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* the width or height is negative.
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*
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* For efficiency (though that isn't an issue for this program),
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* specify the painting region using arguments to the repaint()
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* call.
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*
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*/
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void updateSize(MouseEvent e) {
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int x = e.getX();
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int y = e.getY();
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currentRect.setSize(x - currentRect.x, y - currentRect.y);
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updateDrawableRect(getWidth(), getHeight());
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Rectangle totalRepaint = rectToDraw.union(previousRectDrawn);
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repaint(totalRepaint.x, totalRepaint.y, totalRepaint.width,
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totalRepaint.height);
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}
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}
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protected void paintComponent(Graphics g) {
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super.paintComponent(g); //paints the background and image
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//If currentRect exists, paint a box on top.
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if (currentRect != null) {
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//Draw a rectangle on top of the image.
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g.setXORMode(Color.white); //Color of line varies
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//depending on image colors
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g.drawRect(rectToDraw.x, rectToDraw.y, rectToDraw.width - 1,
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rectToDraw.height - 1);
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controller.updateLabel(rectToDraw);
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}
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}
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private void updateDrawableRect(int compWidth, int compHeight) {
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int x = currentRect.x;
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int y = currentRect.y;
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int width = currentRect.width;
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int height = currentRect.height;
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//Make the width and height positive, if necessary.
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if (width < 0) {
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width = 0 - width;
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x = x - width + 1;
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if (x < 0) {
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width += x;
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x = 0;
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}
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}
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if (height < 0) {
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height = 0 - height;
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y = y - height + 1;
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if (y < 0) {
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height += y;
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y = 0;
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}
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}
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//The rectangle shouldn't extend past the drawing area.
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if ((x + width) > compWidth) {
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width = compWidth - x;
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}
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if ((y + height) > compHeight) {
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height = compHeight - y;
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}
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//Update rectToDraw after saving old value.
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if (rectToDraw != null) {
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previousRectDrawn.setBounds(rectToDraw.x, rectToDraw.y,
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rectToDraw.width, rectToDraw.height);
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rectToDraw.setBounds(x, y, width, height);
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} else {
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rectToDraw = new Rectangle(x, y, width, height);
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}
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}
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}
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}
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