painting.java

一个画图程序 初学：）

import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;
import javax.swing.event.*;
import java.awt.event.*;


class painting
{
	static Shape s[]=new Shape[100];
	Shape temp;
	
	static paintingBoard p;
		
	static String object;
	static Color color=Color.black;
	static Color colors[]=new Color[100];
	static String shapes[]=new String[100];
	static double data[][][]=new double[100][10][2];
		
	int counter;
	
	static int m;
		
	int i;
	
			
	class paintingBoard extends JComponent
	{	    	
		public void paint(Graphics g)
		{
			Graphics2D g2D=(Graphics2D)g;
			
			
			if(counter==1)
			{
				g2D.setPaint(color);
				g2D.draw(temp);
			}
						
			
			for(i=0;i<m;i++)
			{
			    g2D.setPaint(colors[i]);
				g2D.draw(s[i]);
			}
		}			
	}
		
			
	void addPainting(window w)
	{	
		p=new paintingBoard();
		
		p.addMouseMotionListener(new mouseInputHandler());			
		p.addMouseListener(new mouseInputHandler());
		
		w.content.add(p);		
	}

//***************************************************************************************************************//	
	
	void createLine()
	{
		Line2D.Double l=new Line2D.Double(startX,startY,x,y);
		
		
		if(counter==1)
		{
			temp=l;
			
			data[m][0][0]=startX;
		    data[m][0][1]=startY;
		}
		
		if(counter==2)
		{
			s[m]=l;
			
			colors[m]=color;
		    shapes[m]="Line";
		    		    		   
		    data[m][1][0]=endX;
		    data[m][1][1]=endY;
		     		    		    
		    
		    m+=1;
		}
	}
	
	
	void createRectangle()
	{
		double height=x-startX;
		double width=y-startY;
		
		if((x-startX)<0.0)
		height=-(x-startX);
		
		if((y-startY)<0.0)
		width=-(y-startY);
		
		Rectangle2D.Double r=new Rectangle2D.Double(startX,startY,height,width);
		
		
		if(counter==1)
		{
			temp=r;
			data[m][0][0]=startX;
		    data[m][0][1]=startY;
		}
		
				
		if(counter==2)
		{
			s[m]=r;
		    
		    colors[m]=color;
		    shapes[m]="Rectangle";
		    
		    data[m][1][0]=height;
		    data[m][1][1]=width;
		
		
	        m+=1;
		}		
	}

//****************************************************************************************************************/
    
    double startX;
    double startY;
    
    double endX;
    double endY;
    
    double x;
	double y;
	
	
    class mouseInputHandler extends MouseInputAdapter
    {
       	public void mousePressed(MouseEvent e)
    	{
    		if(counter==0)
    		{
    			startX=e.getX();
    		    startY=e.getY();
    		    
    		    counter=1;
    		}
    	}
    	
    	
    	public void mouseReleased(MouseEvent e)
    	{
    		if(counter==1)
    		{
    			endX=x=e.getX();
    			endY=y=e.getY();
    			
    			counter=2;
    			
    			if(object=="Line")
    			createLine();
    				
    			if(object=="Rectangle")
    			createRectangle();
    			
    			p.repaint();
    			
    		
    			counter=0;
    		}
    	}
    	
    	            
        public void mouseDragged(MouseEvent e)
    	{
    		if(counter==1)
    		{
    			x=e.getX();
    			y=e.getY();
    				
    			
    			if(object=="Line")
    			{
    				createLine();
    			    p.repaint();
    			}
    			    		    
    		    if(object=="Rectangle")
    		    {
    		    	createRectangle();
    		        p.repaint();
    		    }
    	   }
    	}
     }	
}