objrectangle.java

用java编写的画图面板程序（有源代码）

package project.paint;

import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.geom.Rectangle2D;

//矩形类
class ObjRectangle extends BaseObject {
	public ObjRectangle() {
		super();
		type=BaseObject.RECTANGLE;
	}
	public String toString() {
		String s="矩形("+String.valueOf(getMinX())+","+String.valueOf(getMinY())+")";
		s+=" 宽: "+String.valueOf(getWidth())+", 高: "+String.valueOf(getHeight());
		if (filled)
			s+=", 填充";
		return s;
	}
	public void addPoint(int x,int y) {
		if (gradientPaint>0) {
			if (p1==null) {
				p1=new Point(x,y);
				p2=new Point(x,y);
			} else {
				if (X.size()==2) {
					int xB=getPointX(1);
					int yB=getPointY(1);
					if (gradientPaint==1) {
						p2.x+=x-xB;
					} else if (gradientPaint==2) {
						p2.y+=y-yB;
					} else if (gradientPaint==3) {
						p2.x+=x-xB;
						p2.y+=y-yB;
					}
				}
			}
			setGradientPaint(p1,p2);
		}
		if (X.size()==0) {
			X.add(x);
			Y.add(y);
		} else {
			if (X.size()==1) {
				X.add(x);
				Y.add(y);
			} else {
				X.set(1,x);
				Y.set(1,y);
			}
		}
	}
	public void draw(Graphics2D g2d) {
		shape=new Rectangle2D.Float(getMinX(),getMinY(),getWidth(),getHeight());
		shape2=new Rectangle2D.Float(0,0,getWidth(),getHeight());
		doDraw(g2d,shape);
	}
	public void fill()
	{
		filled=true;
	}
}