fallingsleet.java

书籍"Java_面向事件编程"的附带光盘代码

import java.awt.Color;

import objectdraw.DrawingCanvas;
import objectdraw.FilledOval;

// FallingSleet class
public class FallingSleet extends FallingObject {
    
    // size of a sleet pellet
    private static final int SLEET_SIZE = 10;
    
    // color for sleet
    private static final Color SLEET_COLOR = new Color(220, 220, 255);
    
    // initialize the instance variables and start the active object
    public FallingSleet(DrawingCanvas canvas, double x, 
                        double aSpeed, int aScreenHeight) {
        
        // first, call the constructor of the FallingObject class
        super(aScreenHeight, aSpeed);
        
        // create our sleet pellet
        object = new FilledOval(x, -SLEET_SIZE, SLEET_SIZE, SLEET_SIZE, canvas);
        object.setColor(SLEET_COLOR);
        
        start();
    }
}