polygon.java

windows画图板.类似于windows自带的画图程序!

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

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) {
        this();
        color = c;
        stroke = s;
        pointsSet.addPoint(x, y);
        currX = x;
        currY = y;
        finalized = false;
    }
    
    public PolyGon() {
        pointsSet = new PointsSet();
    }
    
    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) {
    	GeneralPath s = new GeneralPath();
        g.setColor(color);
        g.setStroke(stroke);
        if (finalized) {    //draw a close polygon
            int[][] points = pointsSet.getPoints();
            if (points == null)
                return;
            g.drawPolygon(points[0], points[1], points[0].length);
        } else {    //don't draw a closed polygon
            int[][] points = pointsSet.getPoints(currX, currY);
            g.drawPolyline(points[0], points[1], points[0].length);
            s.closePath();
        }
    }
    
    public String getShapeData() {
        int si = 0;
        for (int i=0; i<DrawingBoard.STROKES.length; i++) {
            if (stroke == DrawingBoard.STROKES[i]) {
                si = i;
                break;
            }
        }
        StringBuffer buffer = new StringBuffer();
        buffer.append(color.getRGB());
        buffer.append(":");
        buffer.append(si);
        int[][] ps = pointsSet.getPoints();
        for (int i=0; i<ps[0].length; i++) {
            buffer.append(":");
            buffer.append(ps[0][i]);
            buffer.append(":");
            buffer.append(ps[1][i]);
        }
        return buffer.toString();
    }
    
    public void setShapeData(String data) throws Exception {
        String splits[] = data.split(":");
        color = new Color(Integer.parseInt(splits[0]));
        stroke = DrawingBoard.STROKES[Integer.parseInt(splits[1])];
        for (int i=2; i<splits.length; i+=2) {
            pointsSet.addPoint(Integer.parseInt(splits[i]),
                    Integer.parseInt(splits[i+1]));
        }
        finalized = true;
    }
    
}