target.java

斯坦福大学的Java课上的作业

/*
 * File: Target.java
 * Name: 
 * Section Leader: 
 * -----------------
 * This file is the starter file for the Target problem.
 */

import acm.graphics.*;
import acm.program.*;
import java.awt.*;

public class Target extends GraphicsProgram {	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private static final int BIG_RED_RADIUS = 72;
	private static final int SMALL_RED_RADIUS = (int)(72 * 0.3);
	private static final int WHITE_RADIUS = (int)(72 * 0.65);
	
	public void run() {
		int centerX = getWidth()/2;
	    int centerY = getHeight()/2;
	    
	    /*big red circle*/
		GOval big_red_circle = new GOval(centerX-BIG_RED_RADIUS, centerY-BIG_RED_RADIUS, 2 * BIG_RED_RADIUS, 2 * BIG_RED_RADIUS);	
		big_red_circle.setFillColor(Color.RED);	
		big_red_circle.setFilled(true);
		add(big_red_circle);
		
		/*white circle*/
		GOval white_circle = new GOval(centerX-WHITE_RADIUS, centerY-WHITE_RADIUS, 2 * WHITE_RADIUS, 2 * WHITE_RADIUS);	
		white_circle.setFillColor(Color.WHITE);	
		white_circle.setFilled(true);
		add(white_circle);
		
		/*small red circle*/
		GOval small_red_circle = new GOval(centerX-SMALL_RED_RADIUS, centerY-SMALL_RED_RADIUS, 2 * SMALL_RED_RADIUS, 2 * SMALL_RED_RADIUS);	
		small_red_circle.setFillColor(Color.RED);
		add(small_red_circle);
		small_red_circle.setFilled(true);

	}
}