I need help spawning in planets with the numpad. Here is the Space code and Body code could anyone tell me what I am doing wrong?
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 | ******Body*******import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)import java.util.List;/** * A 'Body' is any kind of object in space that has a mass. It could be a star, or a planet, * or anything else that floats around in space. * * @author Michael Kolling * @version 0.1 */public class Body extends SmoothMover{ // constants private static final double GRAVITY = 5.8; private static final Color defaultColor = new Color(255, 216, 0); // fields private double mass; private boolean keydown; /** * Construct a Body with default size, mass, movement and color. */ public Body() { this (20, 300, new Vector(0, 1.0), defaultColor); } /** * Construct a Body with a specified size, mass, movement and color. */ public Body(int size, double mass, Vector movement, Color color) { this.mass = mass; addForce(movement); GreenfootImage image = new GreenfootImage (size, size); image.setColor (color); image.fillOval (0, 0, size-1, size-1); setImage (image); } /** * Act. That is: apply the gravitation forces from * all other bodies around, and then move. */ public void act() { move(); applyForces(); bounceAtEdge(); numPad(); } /** * Return the mass of this body. */ public double getMass() { return mass; } private void applyForces() { List<Body> bodies = getWorld().getObjects(Body.class); for(Body body : bodies) { if (body != this) { applyGravity (body); } } } private void applyGravity(Body other) { double dx = other.getExactX() - this.getExactX(); double dy = other.getExactY() - this.getExactY(); Vector force = new Vector (dx, dy); double distance = (dx*dx + dy*dy); double strength = (GRAVITY * this.mass * other.mass / (distance * distance)); double acceleration = strength / this.mass; force.setLength (acceleration); addForce (force); } private void bounceAtEdge() { if(getX() == getWorld().getWidth()-1) { setLocation((double)getX(), (double)getY()); getMovement().revertHorizontal(); accelerate(0.9); } if(getX() == 0) { setLocation((double)getX(), (double)getY()); getMovement().revertHorizontal(); accelerate(0.9); } if(getY() == getWorld().getHeight()-1) { setLocation((double)getX(), (double)getY()); getMovement().revertVertical(); accelerate(0.9); } if(getY() == 0) { setLocation((double)getX(), (double)getY()); getMovement().revertVertical(); accelerate(0.9); } } public void numPad() { int num = 0; if (Greenfoot.isKeyDown("0")) { getWorld().removeObjects(getWorld().getObjects(Body.class)); } if (Greenfoot.isKeyDown("1")){num = 1;} if (Greenfoot.isKeyDown("2")){num = 2;} if (Greenfoot.isKeyDown("3")){num = 3;} if (Greenfoot.isKeyDown("4")){num = 4;} if (Greenfoot.isKeyDown("5")){num = 5;} if (Greenfoot.isKeyDown("6")){num = 6;} if (Greenfoot.isKeyDown("7")){num = 7;} if (Greenfoot.isKeyDown("8")){num = 8;} if (Greenfoot.isKeyDown("9")){num = 9;} for (int loop = 0; loop < 0; loop--) { int size = 20 + Greenfoot.getRandomNumber(40); double mass = size * Greenfoot.getRandomNumber(10); int degree = Greenfoot.getRandomNumber(360); double speed = Greenfoot.getRandomNumber(5); int r = Greenfoot.getRandomNumber(255); int g = Greenfoot.getRandomNumber(255); int b = Greenfoot.getRandomNumber(255); int x = Greenfoot.getRandomNumber(getWorld().getWidth()); int y = Greenfoot.getRandomNumber(getWorld().getHeight()); getWorld().addObject (new Body(size, mass, new Vector(degree, speed), new Color(r,g,b)), x, y); num--; } } }*******Space********import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)/** * Space. The final frontier. * * @author Michael Kolling * @version 1.0 */public class Space extends World{ /** * Create space. */ public Space() { super(960, 620, 1); randomPlanets(); // Uncomment one of the following method calls if you want the objects created automatically: //sunAndPlanet(); //sunAndTwoPlanets(); //sunPlanetMoon(); } /** * Set up the universe with a sun and a planet. */ public void sunAndPlanet() { removeAllObjects(); addObject (new Body (50, 240.0, new Vector(270, 0.03), new Color(255, 216, 0)), 460, 270); addObject (new Body (20, 4.2, new Vector(90, 2.2), new Color(0, 124, 196)), 695, 260); } /** * Set up the universe with a sun and two planets. */ public void sunAndTwoPlanets() { removeAllObjects(); addObject (new Body (50, 240.0, new Vector(270, 0.0), new Color(255, 216, 0)), 460, 310); addObject (new Body (20, 4.2, new Vector(90, 2.2), new Color(0, 124, 196)), 695, 300); addObject (new Body (24, 4.6, new Vector(270, 1.8), new Color(248, 160, 86)), 180, 290); } /** * Set up the universe with a sun, a planet, and a moon. */ public void sunPlanetMoon() { removeAllObjects(); addObject (new Body (50, 240.0, new Vector(270, 0.0), new Color(255, 216, 0)), 460, 270); addObject (new Body (20, 4.2, new Vector(90, 2.2), new Color(0, 124, 196)), 720, 260); addObject (new Body (5, 0.8, new Vector(90, 3.25), new Color(240, 220, 96)), 748, 260); } /** * Remove all objects currently in the world. */ private void removeAllObjects() { removeObjects (getObjects(Actor.class)); } //Randomly Generate Planets public void randomPlanets() { for(int i = 10 + Greenfoot.getRandomNumber(10); i > 0; i--) { int size = 20 + Greenfoot.getRandomNumber(40); double mass = size * Greenfoot.getRandomNumber(10); int degree = Greenfoot.getRandomNumber(360); double speed = Greenfoot.getRandomNumber(5); int r = Greenfoot.getRandomNumber(255); int g = Greenfoot.getRandomNumber(255); int b = Greenfoot.getRandomNumber(255); int x = Greenfoot.getRandomNumber(getWidth()); int y = Greenfoot.getRandomNumber(getHeight()); addObject(new Body(size, mass, new Vector(degree, speed), new Color(r,g,b)), x, y); } } } |
