fallingsnow.java

书籍"Java_面向事件编程"的附带光盘代码

import java.awt.Image;

import objectdraw.DrawingCanvas;
import objectdraw.VisibleImage;

// FallingSnow class modified to extend FallingObject

public class FallingSnow extends FallingObject {
    
    // initialize the instance variables and start the active object
    public FallingSnow(
                       DrawingCanvas canvas,
                       Image aSnowPic,
                       double x,
                       double aSpeed,
                       int aScreenHeight) {
        // first, call the constructor of the FallingObject class
        super(aScreenHeight, aSpeed);
        
        // create our snowflake, but use the instance variable given in
        // the FallingObject instead
        object = new VisibleImage(aSnowPic, 0, 0, canvas);
        object.move(x, -object.getHeight());
        
        start();
    }
}