drawroundml.java

用JAVA写的画图软件

// 鼠标画圆事件
package graphInterface;

import java.awt.event.*;
import java.awt.*;

import javax.swing.*;

public class DrawRoundML 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, r;


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

	public void mouseClicked(MouseEvent me) {
	}

	public void mouseEntered(MouseEvent me) {
	}

	public void mouseExited(MouseEvent me) {
	}

	public void mousePressed(MouseEvent me) {
		infoGra.drawString("圆心：" + x0 + ", " + y0, 12, 32);
		infoGra.drawString("半径：" + r, 12, 52);
		x0 = me.getX();
		y0 = me.getY();
		r = 0;
		gra.setXORMode(Color.green);
		gra.setColor(Color.white);
		infoGra.setXORMode(Color.green);
		infoGra.drawString("圆心：" + x0 + ", " + y0, 12, 32);
		infoGra.drawString("半径：" + r, 12, 52);
	}

	public void mouseReleased(MouseEvent me) {
		gra.setPaintMode();
		Alg.round(gra, x0, y0, r);
	}

	public void mouseMoved(MouseEvent me) {
	}

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