绘图程序

开发平台：

Java

OvalCmd.java：源码内容

							package cn.edu.nju.software.grapheditor.cmd;
import java.awt.Point;
import cn.edu.nju.software.grapheditor.Drawing;
import cn.edu.nju.software.grapheditor.shape.Oval;
public class OvalCmd extends Command{
	Oval o;
	public int x1,x2,y1,y2; 
	public void executePress(Point p,Drawing dwg){
		o=new Oval(dwg.currentColor);
		x1=p.x;
		y1 =p.y;
		dwg.a.add(o);
		
	}
	public void executeDrag(Point p, Drawing dwg) {
		 x2=p.x;
		 y2=p.y;
		 o.x=Math.min(x1,x2 );
		 o.y=Math.min(y1,y2);
		 o.width=Math.abs(x1-x2);
		 o.height=Math.abs(y1-y2);
	}
}

						