assoicatorline.java

java 绘图方面的源代码

package com.sunking.tp.framework;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.geom.*;
import java.util.*;
/**
 * <p>Title: </p>
 * <p>Description: 连线</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author <a href="mailto:[e-mail]">SunKing</a>
 * @version 1.0
 * @see Assoicator
 */
public class AssoicatorLine extends Line2D.Double implements java.io.Serializable{
    private static final long serialVersionUID = -3000000000000000003L;
	/**
	*连线的源和目录
	*/
    public JTPComponent source,dest;
	/**
	*连线类型
	*/
    private int associateType;
	/**
	*连线修饰器
	*/
    private Vector vecRenderer = new Vector();
    /**
     *
     * @param source 连线源
     * @param associator 连接器
     */
    public AssoicatorLine(JTPComponent source,Assoicator associator){
        dest = associator.getAssoicator();
        associateType = associator.getAssociateType();
        this.source = source;
        setLinePoints((Component)source,(Component)dest);
        addRenderer(new Arrow(this));
    }
    /**
     *取得连接源
     * @return
     */
    public JTPComponent getSource(){
        return source;
    }
    /**
     *取得连接目标
     * @return
     */
    public JTPComponent getDest(){
        return dest;
    }
    /**
     *取得连接类型
     * @return
     */
    public int getAssociateType(){
        return associateType;
    }
    /**
     *判断是否包含一个点,主要用于点击时的选取动作
     * @param p
     * @return
     */
    public boolean contains(Point2D p) {
        return contains((int)p.getX(),(int)p.getY());
    }
    public boolean contains(int x, int y)  {
        return insideSegment(x,y,(int)getX1(),(int)getY1(),(int)getX2(),(int)getY2());
    }
    protected boolean insideSegment(int x, int y, int x0, int y0, int x1, int y1) {
        if (x1 == x0)
            return (x == x0) && (y >= Math.min(y0,y1)) && (y <= Math.max(y0,y1));
        Rectangle bounds = new Rectangle(x0,y0,1,1);
        int fudge = (int)Math.round(insideTolerance());
        bounds.add(x1,y1);
        bounds.grow(fudge,fudge);
        if (!bounds.contains(x,y)) return false;
        double slope = (double)(y1-y0) / (double)(x1-x0);
        double fx = (slope * (double)(x-x0)) + (double)y0;
        return Math.abs(fx - (double)y) < insideTolerance(slope);
    }
    protected double insideTolerance(double slope) {
        return Math.max(insideTolerance(),Math.abs(slope));
    }
    protected double insideTolerance() {
        return 2.5;
    }
    /**
     *绘制线和修饰器
     * @param g
     */
    public void drawLine(Graphics g){
        Point2D pStart = getP1();
        Point2D pEnd = getP2();
        g.drawLine((int)pStart.getX(),(int)pStart.getY(),
                   (int)pEnd.getX(),(int)pEnd.getY());
        for (int i = 0; i < vecRenderer.size(); i++) {
            LineRenderer renderer = (LineRenderer)vecRenderer.get(i);
            renderer.paint(g);
        }
    }
    /**
     *绘制选取状态
     * @param g
     */
    public void drawHandle(Graphics g){
        Graphics2D g2=(Graphics2D)g;
        g2.setStroke(new BasicStroke(2));
        drawLine(g);
        g2.setStroke(new BasicStroke(1));
    }
    /**
     *添加修饰器
     * @param renderer
     */
    public void addRenderer(LineRenderer renderer){
        vecRenderer.add(renderer);
    }
    /**
     *移取修饰器
     * @param renderer
     */
    public void removeRenderer(LineRenderer renderer){
        vecRenderer.remove(renderer);
    }
    /**
     *根据连接源和连接目标定位线的位置
     * @param source
     * @param target
     */
    private void setLinePoints(Component source,Component target){
        Component cSource =(Component)source;
        Component cDest =(Component)dest;
        int x1,y1,x2,y2;
        x1=y1=x2=y2=0;
        x1=cSource.getX()+(cSource.getWidth()/2);
        y1=cSource.getY()+(cSource.getHeight()/2);
        x2=cDest.getX()+(cDest.getWidth()/2);
        y2=cDest.getY()+(cDest.getHeight()/2);
        setLine(x1,y1,x2,y2);
        setLine(getPointShortToComponent(cSource),getPointShortToComponent(cDest));
    }
    private Point getPointShortToComponent(Component c){
        int x1=c.getX();
        int y1=c.getY();
        int x2=x1+c.getWidth();
        int y2=y1+c.getHeight();
        if(intersectsLine(x1,y1,x2,y1)){//top
            return new Point(x1+c.getWidth()/2,y1);
        }else if(intersectsLine(x1,y2,x2,y2)){//bottom
            return new Point(x1+c.getWidth()/2,y2);
        }else if(intersectsLine(x2,y1,x2,y2)){//right
            return new Point(x2,y1+c.getHeight()/2);
        }else{//left
            return new Point(x1,y1+c.getHeight()/2);
        }
    }
}