I've seen the threads which have discussed this but I still have trouble identifying the solution to my problem. So I've had this problem in my past projects but I've found other ways around it, but it messed up other code in different classes.
So I've made a pipe in "myWorld" which sends Mario to "CoinWorld" when Mario is on it. I've added a clump of coins in the middle of "CoinWorld", as I was testing it, Mario touched the coin and this error popped up. It led me to the class coin, where the error lies in the checkTouch() method:
So how can I be able to access the same scoreboard without casting? Or is there some other solution?
Here is the myWorld class which carries the scoreboard I need to access:
And here's the pipe class where I changed the world into "CoinWorld":
One of the errors I come across the most, so finding a solution around this will be a life-saver!
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | public class Coin extends Items{ /** * Act - do whatever the Coin wants to do. This method is called whenever * the 'Act' or 'Run' button gets pressed in the environment. */ public void act() { checkTouch(); } public void checkTouch() { MyWorld world = (MyWorld)getWorld(); ScoreBoard getScoreBoard = world.getScoreBoard(); if(isTouching(Mario.class)) { getScoreBoard.addScore(5); world.removeObject(this); } }} |
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 | public class MyWorld extends greenfoot.World{ GreenfootImage bg = new GreenfootImage("MarioBackground.png"); private ScoreBoard theScoreboard; private Mario mario; private int level = 1; /** * Constructor for objects of class MyWorld. * */ public MyWorld() { super(1500, 500, 1); setBackground(bg); theScoreboard = new ScoreBoard(); mario = new Mario(); prepare(); } /** * Prepare the world for the start of the program. * That is: create the initial objects and add them to the world. */ private void prepare() { // switches sections everytime mario hits the edge of the world, must complete three sections each time to go to the next level switch(level) { case 2: // entities addObject(mario,95,460); Koopa koopa = new Koopa(); addObject(koopa,616,172); Koopa koopa2 = new Koopa(); addObject(koopa2,1356,326); // flooring addFloor(); removeFloor(800, 20); // other addObject(theScoreboard,100, 50); addObject(new Timer(), getWidth()/2, 50); // platforms regularBlocks(175,350,8); regularBlocks(406,202,10); regularBlocks(445,95,3); regularBlocks(541,95,3); regularBlocks(700,350,8); regularBlocks(925,450,8); regularBlocks(1200,358,8); regularBlocks(1237,258,2); regularBlocks(1309,258,2); // coinblocks coinBlocks(517,95,1); coinBlocks(1285,258,1); // walls addWalls(480,226,4,4); addWalls(480,394,4,4); addWalls(973,258,4,4); addWalls(973,0,4,8); // coins Coin coin = new Coin(); addObject(coin,514,352); Coin coin2 = new Coin(); addObject(coin2,1005,212); Coin coin3 = new Coin(); addObject(coin3,490,25); Coin coin4 = new Coin(); addObject(coin4,550,24); Coin coin5 = new Coin(); addObject(coin5,210,304); Coin coin6 = new Coin(); addObject(coin6,306,302); Coin coin7 = new Coin(); addObject(coin7,749,314); Coin coin8 = new Coin(); addObject(coin8,827,314); Coin coin9 = new Coin(); addObject(coin9,1284,317); Coin coin10 = new Coin(); addObject(coin10,1007,411); break; case 1: // entities addObject(mario, 95, 460); // objects addObject(theScoreboard,100, 50); addObject(new Timer(), getWidth()/2, 50); // walls addWalls(192,392,4,4); addWalls(360,272,4,9); addWalls(528,392,4,4); // platforms regularBlocks(695,416,6); regularBlocks(12,300,5); // flooring addFloor(); removeFloor(288,3); removeFloor(456,3); // pipes VerticalPipe verticalPipe = new VerticalPipe(); addObject(verticalPipe,26,253); break; case 3: addFloor(); removeFloor(getRandomNumber(500,750), 8); removeFloor(getRandomNumber(1000, 1250), 9); addObject(new Timer(), getWidth()/2, 50); addObject(mario, 95, 460); addingKoopas(level); Flag flag = new Flag(); addObject(flag,1450,335); EmptyBlock emptyBlock = new EmptyBlock(); emptyBlock.getImage().scale(47, 50); addObject(emptyBlock,1450, 455); } } public void nextSection() { removeObjects(getObjects(null)); //removes all objects level++; //moves to next section prepare(); // adds all objects for section 2 } // This method auto-generated a floor for the entire level, no matter how long it is! Wohoo generalization :) public void addFloor() { Block block = new Block(); int blockWidth = block.getImage().getWidth(); int blockHeight = block.getImage().getHeight(); int numBlocksFloor = getWidth() / blockWidth; for (int i = 0; i <= numBlocksFloor; ++i) { addObject(new Block(), i*blockWidth, getHeight() - blockHeight/2); } } // This method auto-generates a singular gap in the floor whenever requested; able to control the distance of the gap and where it will be located public void removeFloor(int xValue, int gapDistance) { Block block = new Block(); int blockHeight = block.getImage().getHeight(); int blockWidth = block.getImage().getWidth(); for(int i = 0; i < gapDistance; i++) { removeObjects(getObjectsAt(xValue + i*blockWidth, getHeight() - blockHeight/2, Block.class)); } } // A modular method designed to add coin blocks in clumps of [amount of blocks] whenever requested public void coinBlocks(int xStart, int yStart, int blocks) { CoinBlock cb = new CoinBlock(); int blockWidth = cb.getImage().getWidth(); for(int a = 0; a < blocks; a++) { addObject(new CoinBlock(), xStart+(a*blockWidth), yStart); } } // A modular method designed to add regular blocks as platforms public void regularBlocks(int xStart, int yStart, int blocks) { Block block = new Block(); int blockWidth = block.getImage().getWidth(); for(int i = 0; i < blocks; i++) { addObject(new Block(), xStart+(i*blockWidth), yStart); } } // a method designed to create a huge clump of blocks and make a brick wall public void addWalls(int xStart, int yStart, int blocks, int rows) { Block block = new Block(); int blockHeight = block.getImage().getHeight(); for(int i = 0; i < rows; i++) { regularBlocks(xStart,yStart+(i*blockHeight),blocks); } } // This method adds and controls the amount of koopas that are added into the world public void addingKoopas(int koopas) { for(int i = 0; i < koopas; i++) { addObject(new Koopa(), getRandomNumber(500,1300), getHeight()/2); } } public void addingParas(int paras) { for(int i = 0; i < paras; i++) { addObject(new ParaTroopa(), getRandomNumber(500, 1300), 80); } } // A method which generates a number between the desired values public int getRandomNumber(int start,int end) { int normal = Greenfoot.getRandomNumber(end-start+1); return normal+start; } public Mario getMario() { return mario; } public ScoreBoard getScoreBoard() { return theScoreboard; }} |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | public class VerticalPipe extends Platform{ /** * Act - do whatever the VerticalPipe wants to do. This method is called whenever * the 'Act' or 'Run' button gets pressed in the environment. */ public void act() { checkMario(); } // This method checks if mario is on top or not public void checkMario() { int blockHeight = getImage().getHeight(); int yDistance = blockHeight/-2; Actor mario = getOneObjectAtOffset(0,yDistance - 5, Mario.class); if(mario != null) { Greenfoot.setWorld(new CoinWorld()); } }} |
