drawline.java

用Java开发的、实现类似Visio功能的应用程序源码

/**
 *    $Id:DrawLine.java $
 *
 *    Copyright 2004 ~ 2005  JingFei International Cooperation LTD. All rights reserved. *
 */
package com.jfimagine.jfdraw.draw;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;

import com.jfimagine.jfgraph.geom.JFPoint;
import com.jfimagine.jfgraph.geom.LineSeg;

import com.jfimagine.jfgraph.shape.base.AbstractObject;
import com.jfimagine.jfgraph.shape.base.AbstractShape;
import com.jfimagine.jfgraph.shape.base.Port;
import com.jfimagine.jfgraph.shape.union.JFPage;
import com.jfimagine.jfgraph.shape.line.JFLine;

import com.jfimagine.jfgraph.shape.decorate.GridFormat;

import com.jfimagine.jfdraw.draw.AbstractDrawEvent;
import com.jfimagine.jfdraw.draw.DrawConst;

 
 /**
 * Draw line class. It's a class to manipulate JFLine operations.
 *
 * @author     CookieMaker    
 *
 * @version $Revision: 1.00 $
 */  
 public class DrawLine extends AbstractDrawEvent{
        
        /**
         *  When a modifier, shift or ctrl button is pressed down. We need to force this line be vertical or horizontal one.
         *
         *  @param e Current mouse event
         *  @param pnt Current mouse position
         */
        private void adjustPointByModifier(MouseEvent e,JFPoint pnt){
        	if (e==null || pnt==null)
        		return;
		       		
		JFPoint lastPoint	=m_drawState.getLastPoint();
    		if (lastPoint!=null && isModifierDown(e)){
			//force vertical or horizontal line now
    			double x	=Math.abs(lastPoint.getX()-pnt.getX());
    			double y	=Math.abs(lastPoint.getY()-pnt.getY());
    			if (x>y)
    				pnt.setY(lastPoint.getY());
    			else
    				pnt.setX(lastPoint.getX());
		}
	}


    	/** Do mouse release
    	 *  @param e Current mouse event.
    	 *  @param lastPort The port can be attached for current object.
    	 */
    	public void doMouseRelease(MouseEvent e,Port attachPort){

    		double zoom	=m_drawCanvas.getZoomScale();
    	        JFPoint pnt=new JFPoint(e.getX()/zoom,e.getY()/zoom);
    		
    		//left mouse down, always doing some confirm operations.
    		if (isLeftDown(e) || isModifierDown(e)){

  			
    			//if not a start point assigned, then assign a start point here.
    			if (!m_drawState.getStartPointAssigned()){

    				GridFormat gridFormat	=m_drawCanvas.getGridFormat();
    				JFPoint snapPos	=gridFormat.getSnapPos(pnt.getX(),pnt.getY());
    				pnt.setValue(snapPos);

    			        //correct current position according to the possible attach port.
    			        if (attachPort!=null){
    			                pnt.setValue(attachPort.getXOffset(),attachPort.getYOffset());
    			        }
    			                
    				//set start point as current mouse position.
    				m_drawState.setStartPoint(pnt);	
    				startPort       =attachPort;

    			//start point assigned, then process the next step of drawing/dragging/transforming.
    			}else{

				GridFormat gridFormat	=m_drawCanvas.getGridFormat();
				JFPoint snapPos		=gridFormat.getSnapPos(pnt.getX(),pnt.getY());
				pnt.setValue(snapPos);

				adjustPointByModifier(e,pnt);
			    			
    			        //correct current position according to the possible attach port.
                                if (attachPort!=null){
                                        pnt.setValue(attachPort.getXOffset(),attachPort.getYOffset());
                                }
				                    			
    				if (m_drawState.getDrawState()==DrawConst.DRAWSTATE_DRAW){
    					//draw a new xor drag line to eliminate the last dragging xor line.
    					drawDragShape();
    					//draw current shape in xor mode to eliminate the shape
    					drawCurrentShape(true);
    					
    					//add a new point for shape.
					m_drawState.setLastPoint(pnt); 
					m_drawState.setLastTempPoint(pnt);
					//re-draw a new current shape in xor mode.
					drawCurrentShape(true);
				}

				//if it seems attached to a port, then confirm and end this operation.
				if ((attachPort!=null) && ifCompleteDrawing(true)){
				        endPort      =attachPort;
    				        Graphics g=m_drawCanvas.getGraphics();
				        finalizeMouseEvent(g);
				        g.dispose();
				 }
    			}

    		//right mouse down, always doing some cancel operations.
    		}else if (isRightDown(e)){
    			if (m_drawState.getStartPointAssigned()){
    				if (m_drawState.getDrawState()==DrawConst.DRAWSTATE_DRAW){
    					//draw a new xor drag line to eliminate the last xor line.
    					drawDragShape();

    					//draw a new shape in xor mode to eliminate the shape
    					drawCurrentShape(true);
    					
					//cancel last point. 
					m_drawState.cancelLastPoint(pnt);

    					//draw a new shape in xor mode.
    					drawCurrentShape(true);
							
					if (m_drawState.getStartPointAssigned()){
    						//draw a new xor drag line from a new last point to temporary point
						drawDragShape();
					}
    				}	
    			}
    		}
    	}    	
    	 
    	       
    	/** Do mouse click
    	 *  @param e Current mouse event.
    	 *  @param lastPort The port can be attached for current object.
    	 */
    	public void doMouseClick(MouseEvent e,Port attachPort){    		
    		//left mouse down, always doing some confirm operations.
    		if ((isLeftDown(e) || isModifierDown(e)) && m_drawState.getStartPointAssigned()){
				//if double click, then confirm and end this operation.
				if (e.getClickCount()==2 && ifCompleteDrawing(true)){
				        endPort      =attachPort;
    				        Graphics g=m_drawCanvas.getGraphics();
				        finalizeMouseEvent(g);
				        g.dispose();
				 }
    		}
    	}


    	/** Draw xor line between lastPoint and lastTempPoint
    	 */
    	protected void drawDragShape(){
    		//avoid a xor end point, so draw an xor point here.
    		drawDragLine(m_drawState.getLastPoint(),m_drawState.getLastPoint());
    		//draw the xor line.
    		drawDragLine(m_drawState.getLastPoint(),m_drawState.getLastTempPoint());
    	}


    	/** draw current shape in xor or paint mode*/
	public void drawCurrentShape(Graphics g,boolean isXorMode){
		
		if (!ifCompleteDrawing(false)) return;			
		AbstractObject obj	=m_drawState.getCurrentShape();

					
		if (isXorMode)	{
			setPaintMode(g,true);
		}else{
			setPaintMode(g,false);
		}
		
		if (obj instanceof AbstractShape){
			((AbstractShape)obj).draw(g,isXorMode);
			if (!isXorMode){
				((AbstractShape)obj).drawPicked(g,false);
			}
		}	
	}
        
        /**A temporary moving point for mouse move event*/
	private JFPoint m_movingPoint	=new JFPoint();
	
    	/** Do mouse move*/
    	public void doMouseMove(MouseEvent e){

    		double zoom	=m_drawCanvas.getZoomScale();
    		m_movingPoint.setValue(e.getX()/zoom,e.getY()/zoom);
		adjustPointByModifier(e,m_movingPoint);
		
    		if (m_drawState.getStartPointAssigned()){

			GridFormat gridFormat	=m_drawCanvas.getGridFormat();
			JFPoint snapPos		=gridFormat.getSnapPos(m_movingPoint.getX(),m_movingPoint.getY());

    			if (m_drawState.getDrawState()==DrawConst.DRAWSTATE_DRAW){
			 	
			 	drawDragShape();
			 	
			 	//draw new line in dragging.
			 	m_drawState.setLastTempPoint(snapPos.getX(),snapPos.getY());
			 	drawDragShape();
			 }
    		}
    	}
	 	
 }