polygon.java

java画图程序. 能完成大多数的功能.

/**
 * Created by LHand on May 19th 2007 00：10
 * derect extends from IShape , a lonely class for PolyGon
 */
package cn.edu.xmu.LHand;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Stroke;
import java.awt.event.MouseEvent;

public class Polygon extends IShape{
	protected Color color;
    protected float stroke;
    protected PointSet pointSet;
    protected int currentX;
    protected int currentY;
    protected int endX;
    protected int endY;
	
	public Polygon(Color colors, float stroke, int x, int y){
		
		pointSet = new PointSet();
		color = colors;
		this.stroke = stroke;
		currentX = x;
		currentY = y;
		pointSet.addPoint(currentX, currentY);
		
	}
	public void mousePressed(MouseEvent event){
		endX = event.getX();
		endY = event.getY();
	}
	public void mouseDragged(MouseEvent event){
		
		endX = event.getX();
		endY = event.getY();
	}
	
	public void mouseReleased(MouseEvent event){
		
		currentX = event.getX();
		currentY = event.getY();
		pointSet.addPoint(currentX, currentY);
	}
		
	public void draw(Graphics2D g2D){
		
		g2D.setStroke(new BasicStroke(stroke));
		g2D.setColor(color);
		
		int[][] point = pointSet.getPoints();
		if(point == null)
			return;
		int size = point[0].length;
		
			
		if(true){
			if(size>=2){
				
				//判断最后是不是双击了鼠标或者最后滴点和第一个点重合
				//素滴话画的是一个封闭的多边形 -。=
				//当图形已经封闭的时候，就结束该次画图，currentShape置空
				
				if(Math.abs(point[0][size-1]- point[0][0]) <= 1 &&
						Math.abs(point[1][size-1]- point[1][0]) <= 1)
				{
					g2D.drawPolygon(point[0], point[1], size);
					DrawBoard.currentShape = null;
					return;
				
				}
			
				//ms这段不能执行 。。。May 19th 10:57
				if(Math.abs(point[0][size-1]-point[0][size-2]) <= 1 && 
						Math.abs(point[1][size-1]-point[1][size-2]) <= 1){
				
					g2D.drawPolygon(point[0], point[1], size);
					DrawBoard.currentShape = null;
					return;
				}
			}
			
		    g2D.drawLine(currentX, currentY, endX, endY);
			g2D.drawPolyline(point[0], point[1], size);
		}
			
	}
}