printandmeasureshapes.java

这是一种用JAVA开发的图形画法程序 没有错误 欢迎各位朋友改进并上传

/**
 * Title: PrintAndMeasureShapes.java
 * Description:This java file can create a java applet for whole program.
 * And it print shapes and measure shapes
 * 
 * Copyright: Copyright (c) 2006
 * @author Q Jin
 * @version 1.0
 */

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

/**
 * This is a PrintAnd MeasureShapes java file
 * It draw the shapes for whole program
 * 
 *  @param rectNumber
 *  @param ovalNumber
 */

public class PrintAndMeasureShapes extends JApplet{
	
	/**
	 * This is a paint java file
	 * It draws shapes.
	 * 
	 * @param x width of the shapes
	 * @param y height of the shapes
	 */
	
	public void paint( Graphics g ) //throws IllegalRectangleException
	{
		// access the method of the superclass
		super.paint( g );
		
		// declare and initialize variables
		int rectNumber = ( int )(Math.random()*3);
		int ovalNumber = ( int )(Math.random()*4);
		
		// access the method of subclass and set red color
		g.setColor( Color.red );
		
		// draw the shapes use random width and height
		for( int i=1; i<=rectNumber; i++ ){
			int x = ( int )(Math.random()*10+1);
			int y = ( int )(Math.random()*10+1);
			
			// If the determined width and height numbers are the same, then this is not a valid 
			// rectangle. Create the IllegalRectangleException class to signal when
			// an illegal rectangle has been created.
			if( x == y ) throw new IllegalRectangleException();
			
			Rectangle rect = new Rectangle( x, y );
			
			// draw the shape with changing color
			g.fillRect( 100*i-90, 10, x, y );
			g.drawString( "Area:"+rect.calculateArea(),100*i-90, 40 );
			g.drawString( "Perimeter:"+rect.calculatePerimeter(), 100*i-90, 60);
		}
		
		g.setColor( Color.GREEN );
		
		// draw the shapes using random width and height
		for( int i=1; i<=ovalNumber; i++ ){
			int x = ( int )(Math.random()*15+1);
			int y = ( int )(Math.random()*15+1);
			
			// create a new oval object
			Oval oval = new Oval( x, y );
			
			// draw the oval with changing color
			g.fillOval(100*i-90, 70, x, y );
			
			// If the determined width and height numbers are the same (i.e., the oval is a circle)
			// then determine and print their area and perimeter 
			// assume that the oval’s height and width are given in centimetres.
			if( x == y ){
				g.drawString( "Area:"+oval.calculateArea(), 100*i-90, 110);
				g.drawString("Perimeter:"+oval.calculatePerimeter(), 100*i-90, 130);
			}
		}
		
		g.setColor( Color.YELLOW );
		
		g.drawString( "Total "+(rectNumber+ovalNumber)+" shape(s)", 10,150);
	}
}