shapespanel.java

能够画线条、圆和长方形的Java程序

import java.awt.Graphics;
import javax.swing.JPanel;

@SuppressWarnings("serial")
public class ShapesPanel extends JPanel {
	public final int TITLEBAR_SIZE = 35, SHAPE_NUMBER = 5;
	ShapeGenerator gen;
	private int size;
	Shape[] shapes = new Shape[SHAPE_NUMBER];
	
	
	public ShapesPanel(int size){
		this.size = size;
		gen = new ShapeGenerator( size - TITLEBAR_SIZE );
		gen.setShapeType(ShapeGenerator.ShapeType.CIRCLE);
		for(int i = 0 ; i < this.SHAPE_NUMBER; i++){
			shapes[i] = gen.next( );			
		}	
		Shape.setBackgroundColor( this.getBackground() );
	}
	
	
	public void createShapes( ShapeGenerator.ShapeType type){
		gen = new ShapeGenerator( size - TITLEBAR_SIZE );
		gen.setShapeType(type);
		for(int i = 0 ; i < this.SHAPE_NUMBER; i++){
			shapes[i] = gen.next( );			
		}	
		repaint();
	}
	
	
	public void sortShapes1(){
		java.util.Arrays.sort(shapes);
	}
	
	
	public void sortShapes2(){
	// You need to write this method using the bubblesort algorithm, but  
	//  our version of bubblesort will sort in decsending order...largest to 
	//  smallest.  Remember because Shape says it implements the compareTo 
	//  method, but as an abstract method, you will need to override 
	//  this method.  You will need to use the compareTo method to do the sorting
		/*for( int i = 0; i < this.SHAPE_NUMBER; i++)
		{
			for ( int j = i + 1; j < this.SHAPE_NUMBER; j++)
			{
				if( shapes[i].compareTo( shapes[j]) < 0)
				{
					Shape temp = shapes[i];
					shapes[i] = shapes[j];
					shapes[j] = temp;										
				}					
			}
		}*/
		boolean exchange;
		for ( int i = 0; i < this.SHAPE_NUMBER - 1; i++)
		{
			exchange = false;
			for ( int j = this.SHAPE_NUMBER - 2; j >= i; j--)
			{
				if( shapes[j].compareTo( shapes[j + 1]) < 0 )
				{
					Shape temp = shapes[j];
					shapes[j] = shapes[j + 1];
					shapes[j + 1] = temp;
					exchange = true;
				}
			}
			if( !exchange )
				return;
		}
	}
	
	
	public void paintComponent(Graphics g){
		super.paintComponent(g); 
		for(Shape s : shapes )
			s.draw( g );		
	}
	
	
	public void eraseShape(int shapeNumber ){
		if( shapeNumber <= SHAPE_NUMBER && shapeNumber > 0 ){
			shapes[shapeNumber -1 ].setVisible(false);
			repaint();
		}
	}
	
	public void showShape(int shapeNumber ){
		if( shapeNumber <= SHAPE_NUMBER && shapeNumber > 0 ){
			shapes[shapeNumber -1 ].setVisible(true);
			repaint();
		}
	}	
	
}	// end of ShapesPanel class