Good evening,
I have created my code below which appears to go through. The problem is that the image is never displayed on the canvas. I have even dropped the food manually on the canvas and watched the debug window walk the code and still no food. Here is the code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)import java.util.Random;import java.awt.Color;/** * A pile of food for which ants will search. * A new object consists of 100 crumbs. */public class Food extends Actor{ private int nCrumbs; private static final int MAX_CRUMBS = 100; // number of crumbs in one food pile private static final int IMG_SIZE = 30; // the height and width of a food object private static final int CRUMB_SIZE = 3; // the radius of a single crumb private GreenfootImage image = null; /** * Create a new food source. * It will have a certain number of crumbs */ public Food() { nCrumbs = MAX_CRUMBS; updateImage(); } /** * Update the image of this food */ public void updateImage() { // Initialize image variable (already declared) as a new Image object GreenfootImage image = new GreenfootImage(IMG_SIZE, IMG_SIZE); // declare local variables x and y int locX, locY; // For-loop that counts up to the total number of crumbs in the Food object for (int i = 0; i < nCrumbs; i++) { // Pick a random x for the crumb's center--random, not Gaussian locX = Greenfoot.getRandomNumber(IMG_SIZE - 4) + 2; // Pick a random y for the crumb's center--random, not Gaussian locY = Greenfoot.getRandomNumber(IMG_SIZE - 4) + 2; // Draw a solid circle centered at x and y with diameter 3 Color myColor = new Color(160, 200, 60); //image.fillOval(locX, locY, CRUMB_SIZE, CRUMB_SIZE); image.setColorAt(locX, locY, myColor); setImage(image); } } /** * Get the image of this food */ public GreenfootImage getImage() { if (image == null) { updateImage(); } return image; } /** * Set the image */ public void setImage() { updateImage(); } /** * Decrease the number of crumbs available * One ant takes one crumb from the Food pile */ // This is the method that is invoked when Ants pick up crumbs. // decrease the number of crumbs in the pile by one // If there are no crumbs left in this object ... // removeObject(this); // Why doesn’t this remove the Food object?? // otherwise.... // update image //Added code from original and remarked out the code within the method. public void takeSome() { if (nCrumbs <= 0) { getWorld().removeObject(this); } else { updateImage(); } } /** * Act - do whatever the Food wants to do. This method is called whenever * the 'Act' or 'Run' button gets pressed in the environment. */ public void act() { // No action code required. Food is inert. } } |
