Auswahl Rahmen bzw. Rechteck Zeichen

[Thomas Darimont]

Hallo!

/*
 * Created on 29.10.2004
 */
package de.tutorials;

import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.image.BufferStrategy;

import javax.swing.JFrame;
import javax.swing.plaf.basic.BasicGraphicsUtils;

/**
 * @author Darimont
 *  
 */
public class Test39 extends JFrame {

    private static final long serialVersionUID = 2868863481341142806L;

    private BufferStrategy strategy;

    private Point p0, p1;

    private Thread runner = new Thread() {
        {
            setPriority(MIN_PRIORITY);
        }

        public void run() {
            while (true) {

                Graphics g = strategy.getDrawGraphics();
                g.clearRect(0, 0, 400, 300);

                if (p0 != null && p1 != null) {
                    int xMin = 0, xMax = 0, yMin = 0, yMax = 0;
                    xMin = Math.min(p0.x, p1.x);
                    xMax = xMin == p0.x ? p1.x : p0.x;
                    yMin = Math.min(p0.y, p1.y);
                    yMax = yMin == p0.y ? p1.y : p0.y;
                    BasicGraphicsUtils.drawDashedRect(g, xMin, yMin, xMax
                            - xMin, yMax - yMin);
                }

                g.dispose();
                strategy.show();

                try {
                    sleep(30L);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                    break;
                }
            }
        }
    };

    public Test39() {
        super("Test39");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setIgnoreRepaint(true);

        addMouseMotionListener(new MouseMotionAdapter() {
            public void mouseMoved(MouseEvent evt) {
                p1 = evt.getPoint();
            }
        });

        addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent evt) {
                p0 = evt.getPoint();
            }
        });

        setSize(400, 300);
        setResizable(false);
        setVisible(true);
        createBufferStrategy(2);
        strategy = getBufferStrategy();
    }

    public static void main(String[] args) {
        new Test39().start();
    }

    private void start() {
        runner.start();
    }
}

Gruß Tom