betterbasketball.java

书籍"Java_面向事件编程"的附带光盘代码

import objectdraw.*;

// This program awards points whenever the mouse is clicked
// inside of the basket.
public class BetterBasketBall extends WindowController{

        // dimensions and locations for the hoop
        private static final int HOOP_TOP = 50;
        private static final int HOOP_HEIGHT = 60;
        private static final int HOOP_WIDTH = 100;
        
        // dimensions and locations for the score display
        private static final int DISPLAY_FONT_SIZE = 16;
        private static final int DISPLAY_TOP = 350;
        
        // the Text object which displays the count
        private Text display;

        // the oval that represent the hoop
        private FramedOval hoop;

        // the number of points
        private int score = 0;

        // initialize the counter and the text message
        public void begin()
        {
                
                display = new Text("Take a shot.",
                                                        0, DISPLAY_TOP, canvas);
                display.setFontSize(DISPLAY_FONT_SIZE);
                display.move( (canvas.getWidth()-display.getWidth())/2, 0 );

                
                hoop = new FramedOval( (canvas.getWidth()-HOOP_WIDTH)/2, HOOP_TOP,
                                                                HOOP_WIDTH, HOOP_HEIGHT, 
                                                                canvas);
                
        }

        // increment the counter if player scores and update the text
        // appropriately
        public void onMouseRelease(Location point)
        {
                if (hoop.contains(point)) {
                        
                        score = score + 2;
                        display.setText("You have scored " + score + " points.");
                        
                } else {
                        
                        display.setText("WHOOPS!  You Missed.");
                }
                
                display.moveTo( (canvas.getWidth() - display.getWidth()) / 2,
                                                DISPLAY_TOP);
        }

}