polygon.java

java编写的最好的画图板程序

/*
 * PolyGon.java
 *
 * Created on April 29, 2005, 6:43 PM
 */

package hysun.draw;

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

/**
 *
 * @author hysun
 */
public class PolyGon implements IShape {
    
    private Color color;
    
    private Stroke stroke;
    
    private PointsSet pointsSet;
    
    private boolean finalized;
    
    private int currX, currY;
    
    public PolyGon(Color c, Stroke s, int x, int y) {
        pointsSet = new PointsSet();
        color = c;
        stroke = s;
        pointsSet.addPoint(x, y);
        currX = x;
        currY = y;
        finalized = false;
    }
    
    public void processCursorEvent(MouseEvent e, int t) {
        currX = e.getX();
        currY = e.getY();
        if (t == IShape.RIGHT_PRESSED) {
            pointsSet.addPoint(currX, currY);
        } else if (t == IShape.LEFT_RELEASED) {
            finalized = true;
            pointsSet.addPoint(currX, currY);
        }
    }
    
    public void draw(Graphics2D g) {
        g.setColor(color);
        g.setStroke(stroke);
        if (finalized) {    //draw a close polygon
            int[][] points = pointsSet.getPoints();
            int s = points[0].length;
            if (s == 1) {
                int x = points[0][0];
                int y = points[1][0];
                g.drawLine(x, y, x, y);
            } else {
                g.drawPolygon(points[0], points[1], s);
            }
        } else {    //don't draw a closed polygon
            int[][] points = pointsSet.getPoints(currX, currY);
            g.drawPolyline(points[0], points[1], points[0].length);
        }
    }
        
}