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Greenfoot back
MisterJ
MisterJ wrote ...

2018/4/3

Easy Counter Code, no tags OS

MisterJ MisterJ

2018/4/3

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Below is an easy counter code for basic programming. First subclass Code: ((Counter)getWorld().getObjects(Counter.class).get(0)).add(1); Second subclass Code: import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo) import java.awt.Color; /** * A simple counter with graphical representation as an actor on screen. * * @author mik * @version 1.0 */ public class Counter extends Actor { private static final Color transparent = new Color(0,0,0,0); private GreenfootImage background; private int value; private int target; /** * Create a new counter, initialised to 0. */ public Counter() { background = getImage(); // get image from class value = 0; target = 0; updateImage(); } /** * Animate the display to count up (or down) to the current target value. */ public void act() { if (value < target) { value++; updateImage(); } else if (value > target) { value--; updateImage(); } } /** * Add a new score to the current counter value. */ public void add(int score) { target += score; } /** * Return the current counter value. */ public int getValue() { return value; } /** * Set a new counter value. */ public void setValue(int newValue) { target = newValue; value = newValue; updateImage(); } /** * Update the image on screen to show the current value. */ private void updateImage() { GreenfootImage image = new GreenfootImage(background); GreenfootImage text = new GreenfootImage("" + value, 22, Color.BLACK, transparent); image.drawImage(text, (image.getWidth()-text.getWidth())/2, (image.getHeight()-text.getHeight())/2); setImage(image); } }
danpost danpost

2018/4/3

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Is there a question here? What you show is fine -- provided there is always one, and only one, Counter object in the world at all times. See my Value Display Tutorial.
MisterJ MisterJ

2018/4/9

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Thanks for the tutorial link danpost. I will definitely check it out.
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