drawlineml.java

用JAVA写的画图软件

// 画线鼠标监听器
package graphInterface;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.Point2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;

import javax.swing.JPanel;

public class DrawLineML implements MouseListener, MouseMotionListener {
	private static JPanel sourcePanel;

	private static JPanel infoPanel;
	
	private static Graphics gra;
	
	private static Graphics infoGra;                                     
	
	private static int x0, y0, xt, yt;


	public DrawLineML(JPanel jp, JPanel ip) {
		sourcePanel = jp;
		infoPanel = ip;
		gra = sourcePanel.getGraphics();
		infoGra = infoPanel.getGraphics();
	}

	public void mouseClicked(MouseEvent me) {
	}

	public void mouseDragged(MouseEvent me) {
		infoGra.drawString("终点：" + xt + ", " + yt, 12, 52);
		infoGra.drawString("半径：" + (int) Point2D.distance(x0, y0, xt, yt), 12,
						72);
		Alg.line(gra, x0, y0, xt, yt);
		xt = me.getX();
		yt = me.getY();
		Alg.line(gra, x0, y0, xt, yt);
		infoGra.drawString("终点：" + xt + ", " + yt, 12, 52);
		infoGra.drawString("半径：" + (int) Point2D.distance(x0, y0, xt, yt), 12,
						72);
	}

	public void mouseEntered(MouseEvent me) {
	}

	public void mouseExited(MouseEvent me) {

	}

	public void mouseMoved(MouseEvent me) {
	}

	public void mousePressed(MouseEvent me) {
		infoGra.drawString("起点：" + x0 + ", " + y0, 12, 32);
		infoGra.drawString("终点：" + xt + ", " + yt, 12, 52);
		infoGra.drawString("距离：" + Point2D.distance(x0, y0, xt, yt), 12, 72);

		xt = x0 = me.getX();
		yt = y0 = me.getY();
		gra.setXORMode(Color.green);
		gra.setColor(Color.white);

		infoGra.setXORMode(Color.green);
		infoGra.drawString("起点：" + x0 + ", " + y0, 12, 32);
		infoGra.drawString("终点：" + xt + ", " + yt, 12, 52);
		infoGra.drawString("距离：" + (int) Point2D.distance(x0, y0, xt, yt), 12,
						72);
	}

	public void mouseReleased(MouseEvent me) {
		gra.setPaintMode();
		Alg.line(gra, x0, y0, xt, yt);
		infoGra.setPaintMode();
	}
}