eraser.java

Java画板

package test.paint;

import test.paint.*;
import java.awt.*;
import javax.swing.JComponent;

/**
 *Eraser类，实现橡皮擦的功能
 *作者:曾燕秋
 *初始时间：2007 5-17
 *最后一次修改时间：2007 6-17
 *
 */

public class Eraser extends ResShape {
	
    //声明一个JComponet对象，获取当前的背景色
    private JComponent board;
    
    /**
     * 有参构造函数
     */
    public Eraser(JComponent board, Stroke s, int x, int y) {
        super(null, s, x, y,0,0);
        this.board = board;
    }
    
    /**
     * 无参构造函数
     */
    public Eraser(JComponent board) {
        this.board = board;
    }
    
    /**
     * 用当前背景色画线作为橡皮擦的功能
     */
    public void draw(Graphics2D g) {
        g.setColor(board.getBackground());
        g.setStroke(stroke);
        int[][] points = pointsSet.getPoints();
        if (points == null)
            return;
        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.drawPolyline(points[0], points[1], s);
        }
    }
    

	/**
	 * Get shapeData，声明一个StringBuffer变量，把图片相关信息加入StringBuffer
	 * 临时变量中，用于保存图片信息
	 * 初始时间：2007 5-17
	 * 最后一次修改时间 2007 6-17
	 */
    public String getShapeData() {
        int si = 0;
        for (int i=0; i<MyPanel.ERASER_STROKES.length; i++) {
            if (stroke == MyPanel.ERASER_STROKES[i]) {
                si = i;
                break;
            }
        }
        StringBuffer buffer = new StringBuffer();
        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();
    }
    
    /**
     * Set shapeData，声明一个String数组，获得文件中所保存的相关信息，当打开图片的
     * 时候，把数组中的内容还原，显示所保存的图片
     * 初始时间：2007 5-17
	 * 最后一次修改时间 2007 6-17
	 */ 
    public void setShapeData(String data) throws Exception {
        String splits[] = data.split(":");
        stroke = MyPanel.ERASER_STROKES[Integer.parseInt(splits[0])];
        for (int i=1; i<splits.length; i+=2) {
            pointsSet.addPoint(Integer.parseInt(splits[i]),
                    Integer.parseInt(splits[i+1]));
        }
    }

	public void setIsFill(boolean x) {
		// TODO Auto-generated method stub
		
	}

	public void setColor(Color col) {
		// TODO Auto-generated method stub
		
	}

	public boolean intersects(double x, double y, double w, double h) {
		// TODO Auto-generated method stub
		return false;
	}

	public Rectangle getBounds() {
		// TODO Auto-generated method stub
		return null;
	}

	public int getX() {
		// TODO Auto-generated method stub
		return 0;
	}

	public int getY() {
		// TODO Auto-generated method stub
		return 0;
	}
    /**
     * 判断是否是图形
     */
	public boolean isImage() {
		// TODO Auto-generated method stub
		return false;
	}
}