svgellipse.java

完全基于java开发的svg矢量绘图工具

		private final EllipseActionListener action=this;
		
		/**
		 * the cursor used when creating a rectangle
		 */
		private Cursor createCursor;
		
		/**
		 * the source component
		 */
		private Object source=null;
		
		private boolean isActive=false;
		
		/**
		 * the constructor of the class
		 */
		protected EllipseActionListener(){
			
			createCursor=getSVGEditor().getCursors().getCursor("ellipse");
		}
		
		/**
		 * resets the listener
		 */
		protected void reset(){
			
			if(isActive){
			    
				Collection frames=getSVGEditor().getFrameManager().getFrames();
			
				Iterator it;
				SVGFrame frm=null;
				LinkedList toBeRemoved=new LinkedList();
				Object mouseListener=null;
				
				//removes all the motion adapters from the frames
				for(it=mouseAdapterFrames.keySet().iterator(); it.hasNext();){
				    
					try{frm=(SVGFrame)it.next();}catch (Exception ex){frm=null;}
			
					if(frm!=null && ! frames.contains(frm)){
					    
						try{
							mouseListener=mouseAdapterFrames.get(frm);
							frm.getScrollPane().getSVGCanvas().removeMouseListener((MouseAdapter)mouseListener);
							frm.getScrollPane().getSVGCanvas().removeMouseMotionListener((MouseMotionListener)mouseListener);
						}catch (Exception ex){}
						
						toBeRemoved.add(frm);
					}
				}
					
				//removes the frames that have been closed
				for(it=toBeRemoved.iterator(); it.hasNext();){
				    
					try{mouseAdapterFrames.remove(it.next());}catch (Exception ex){}
				}

				EllipseMouseListener eml=null;
				
				//adds the new motion adapters
				for(it=frames.iterator(); it.hasNext();){
				    
					try{frm=(SVGFrame)it.next();}catch (Exception ex){frm=null;}
			
					if(frm!=null && ! mouseAdapterFrames.containsKey(frm)){
				
						eml=new EllipseMouseListener(frm);

						try{
							frm.getScrollPane().getSVGCanvas().addMouseListener(eml);
							frm.getScrollPane().getSVGCanvas().addMouseMotionListener(eml);
							frm.getScrollPane().getSVGCanvas().setSVGCursor(createCursor);
						}catch (Exception ex){}
						
						mouseAdapterFrames.put(frm, eml);
					}
				}				
			}
		}
		
		/**
		 * used to remove the listener added to draw a rectangle when the user clicks on the menu item
		 */	
		protected void cancelActions(){
			
			if(isActive){
			    
				//removes the listeners
				Iterator it;
				SVGFrame frm=null;
				LinkedList toBeRemoved=new LinkedList();
				Object mouseListener=null;
			
				//removes all the motion adapters from the frames
				for(it=mouseAdapterFrames.keySet().iterator(); it.hasNext();){
				    
					try{frm=(SVGFrame)it.next();}catch (Exception ex){frm=null;}
				
					if(frm!=null){
					    
						//resets the information displayed
						frm.getStateBar().setSVGW("");
						frm.getStateBar().setSVGH("");
						frm.getScrollPane().getSVGCanvas().setSVGCursor(frm.getSVGEditor().getCursors().getCursor("default"));
					
						try{
							mouseListener=mouseAdapterFrames.get(frm);
							frm.getScrollPane().getSVGCanvas().removeMouseListener((MouseAdapter)mouseListener);
							frm.getScrollPane().getSVGCanvas().removeMouseMotionListener((MouseMotionListener)mouseListener);
							
							if(mouseListener!=null && ((EllipseMouseListener)mouseListener).paintListener!=null){
							    
								//removes the paint listener
								frm.getScrollPane().getSVGCanvas().removePaintListener(((EllipseMouseListener)mouseListener).paintListener, true);
							}
						}catch (Exception ex){}
						
						toBeRemoved.add(frm);
					}
				}
			
				//removes the frames that have been closed
				for(it=toBeRemoved.iterator(); it.hasNext();){
				    
					try{mouseAdapterFrames.remove(it.next());}catch (Exception ex){}
				}
			
				isActive=false;	
			}
		}
		
		/**
		 * the method called when an event occurs
		 * @param evt the event
		 */
		public void actionPerformed(ActionEvent evt){
		    
			if((evt.getSource() instanceof JMenuItem && ! toolItem.isSelected()) || (evt.getSource() instanceof JToggleButton)){
				
				getSVGEditor().cancelActions(false);
				
				if(getSVGEditor().getFrameManager().getCurrentFrame()!=null){
					
					toolItem.removeActionListener(ellipseAction);
					toolItem.setSelected(true);
					toolItem.addActionListener(ellipseAction);
			
					//the listener is active
					isActive=true;
					
					source=evt.getSource();
					Collection frames=getSVGEditor().getFrameManager().getFrames();
					Iterator it;
					SVGFrame frm=null;
					EllipseMouseListener eml=null;
					
					//adds the new motion adapters
					for(it=frames.iterator(); it.hasNext();){
					    
						try{frm=(SVGFrame)it.next();}catch (Exception ex){frm=null;}
					
						if(frm!=null){
	
							eml=new EllipseMouseListener(frm);
	
							try{
								frm.getScrollPane().getSVGCanvas().addMouseListener(eml);
								frm.getScrollPane().getSVGCanvas().addMouseMotionListener(eml);
								frm.getScrollPane().getSVGCanvas().setSVGCursor(createCursor);
	
							}catch (Exception ex){}
							
							mouseAdapterFrames.put(frm, eml);
						}
					}
				}
			}
		}
			
		protected class EllipseMouseListener extends MouseAdapter implements MouseMotionListener{
		
			/**
			 * the points of the area corresponding to the future rectangle
			 */		
			private Point2D.Double point1=null, point2=null;
			
			/**
			 * the paint listener
			 */
			private CanvasPaintListener paintListener=null;
			
			private SVGFrame frame;
		
			/**
			 * the constructor of the class
			 * @param frame a frame
			 */
			public EllipseMouseListener(SVGFrame frame){
			    
				this.frame=frame;
				
				final SVGFrame fframe=frame;
				
				//adds a paint listener
				paintListener=new CanvasPaintListener(){

					public void paintToBeDone(Graphics g) {
					    
						if(point1!=null && point2!=null){
					        
							Rectangle2D.Double rect=getSVGEditor().getSVGToolkit().getComputedRectangle(point1, point2);
							Rectangle2D.Double rect2=new Rectangle2D.Double(rect.x, rect.y, rect.width, rect.height);
							Rectangle2D.Double computedBounds=fframe.getScaledRectangle(rect2, false);
							
							//draws the shape of the element that will be created if the user released the mouse button
							svgEllipse.drawGhost(fframe, (Graphics2D)g,computedBounds);
						}
					}
				};
				
				frame.getScrollPane().getSVGCanvas().addLayerPaintListener(SVGCanvas.DRAW_LAYER, paintListener, false);
			}
					
			/**
			 * the method called when an event occurs
			 * @param evt the event
			 */
			public void mouseDragged(MouseEvent evt) {
			    
				//sets the second point of the element
				point2=frame.getAlignedWithRulersPoint(evt.getPoint());
				
				//asks the canvas to be repainted to draw the shape of the future element
				frame.getScrollPane().getSVGCanvas().delayedRepaint();
			}
				
			/**
			 * the method called when an event occurs
			 * @param evt the event
			 */
			public void mouseMoved(MouseEvent evt) {
			}
				
			/**
			 * the method called when an event occurs
			 * @param evt the event
			 */
			public void mousePressed(MouseEvent evt){
			    
				//sets the first point of the area corresponding to the future element
				point1=frame.getAlignedWithRulersPoint(evt.getPoint());
					
			}
			
			/**
			 * the method called when an event occurs
			 * @param evt the event
			 */
			public void mouseReleased(MouseEvent evt){
				
				Point2D.Double point=frame.getAlignedWithRulersPoint(evt.getPoint());
				
				//creates the element in the SVG document
				if(point1!=null && point1.x>=0 && point1.y>=0 && point!=null){
					
					final Rectangle2D.Double rect=getSVGEditor().getSVGToolkit().getComputedRectangle(point1, point);
					
					Runnable runnable=new Runnable(){
						
						public void run() {

							svgEllipse.drawEllipse(frame, rect);							
						}
					};
					
					frame.enqueue(runnable);
				}

				getSVGEditor().cancelActions(true);
				point1=null;
				point2=null;
			}
		}
	}
}