associatetool.java

用java实现的画图程序

package com.sunking.tp.tool;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.*;
import java.awt.geom.*;
import com.sunking.tp.framework.*;

/**
 *
 * <p>Title: </p>
 * <p>Description:连线工具 </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author <a href="mailto:[e-mail]">SunKing</a>
 * @version 1.0
 */
public class AssociateTool extends AbstractTool {

    /**
     *画虚线用的Stroke
     */
    BasicStroke stroke=new BasicStroke(1.0f,BasicStroke.CAP_BUTT,
                                       BasicStroke.JOIN_ROUND,140.0f,new float[]{1.0f},150.0f);
    Line2D oldLine;
	/**
	*连线源
	*/
    JTPComponent source=null;
    /**
	*连线类型
	*/
	int assoicateType;
    /**
     * @param desk 所属绘图桌面
     * @param assoicateType 连线类型
     * @param icon 图标
     */
    public AssociateTool(Desktop desk,int assoicateType,Icon icon) {
        super(desk);
        this.assoicateType = assoicateType;
        setToolTip("Create association.");
        setIcon(icon);
    }
    /**
     *启动工具
     */
    public void enabledTool() {
        super.enabledTool();
        source = null;
        oldLine = null;
    }
    /**
     *弃用工具
     */
    public void disabledTool() {
        super.disabledTool();
        source = null;
        oldLine = null;
    }
    public void mouseDragged(MouseEvent e){}
    public void mouseClicked(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    public void mousePressed(MouseEvent e) {
		//设置起点和终点
        JTPComponent dest = desk.getJTPComponent(e.getPoint());
        if(dest != null){
            if(source == null){
                source = dest;
                source.setSelect(true);
                Component cSource = (Component)source;
                oldLine = new Line2D.Float();
                int x=cSource.getX()+(cSource.getWidth()/2);
                int y=cSource.getY()+(cSource.getHeight()/2);
                oldLine.setLine(x,y,x,y);
            }else{
                if(source != e.getSource()){
                    source.addAssociator(dest,assoicateType);
                    source.setSelect(false);
                    source = null;
                    oldLine=null;
                    desk.fireAssoicatorChanged();
                }
            }
            desk.mouseSelect(e.getPoint());
        }else if(e.getSource() instanceof Desktop){
            if(source != null){
                source.setSelect(false);
                source = null;
            }
            desk.mouseSelect(e.getPoint());
            ((Container)desk).repaint();
        }
    }
    Component getDesktopPane(Component c){
        if(c instanceof Desktop)
            return c;
        c = c.getParent();
        if(c == null)
            return null;
        return getDesktopPane(c);
    }
    public void mouseMoved(MouseEvent e){
        if(oldLine == null)
            return;
        int x=e.getX(),y=e.getY();
		//画虚线
        Component desktop  = getDesktopPane(e.getComponent());
        Graphics2D g2=(Graphics2D)(desktop.getGraphics());
        g2.setStroke(stroke);
        g2.setXORMode(desktop.getBackground());
        if(oldLine!=null){
            g2.drawLine((int)oldLine.getX1(),(int)oldLine.getY1(),
                        (int)oldLine.getX2(),(int)oldLine.getY2());
        }
        oldLine.setLine(oldLine.getX1(),oldLine.getY1(),e.getX(),e.getY());
        g2.drawLine((int)oldLine.getX1(),(int)oldLine.getY1(),
                    (int)oldLine.getX2(),(int)oldLine.getY2());
    }
}