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zakariaonlyy
zakariaonlyy wrote ...

2012/12/1

Problem with a controller

zakariaonlyy zakariaonlyy

2012/12/1

#
Hey guys, So i am doing this task for school, which should contain three different objects(Dijk, Water, Gras) on and 8*8 field. Dijk and Gras are called using two different for loops. And for Water i am using a timer and adding the object from there. However i want that when the object, reaches the third Gras Object of the seventh row to print a message saying "Dijk has been broken". I have tried this using the getOneObjectAtoffset(), but it doesnt work. I hope one of you guys can help me out. This is what my code looks like : import greenfoot.*; // imports Actor, World, Greenfoot, GreenfootImage import java.util.Random; public class WombatWorld extends World { /** * Create a new world with 8x8 cells and * with a cell size of 60x60 pixels */ public WombatWorld() { super(8, 8, 60); //setBackground("cell.jpg"); maakWater(); maakDijk(); maakGras(); } public void populate() { } private long timeStarted = System.currentTimeMillis(); int x=0; int y=3; public void act() { long currentTime = System.currentTimeMillis() ; long elapsedTime = currentTime - timeStarted; if (elapsedTime / 1000 > 0.1) { timeStarted = currentTime; addObject(new Water(),x,y); x++; if (x == 8){ y++; x = 0; } if (getOneObjectAtOffset(8, 8, Water.class)!= null){ System.out.print("Dijkdoorbraak"); //Greenfoot.stop(); } } } public void maakWater() { for(int y = 0; y < 3; y++) { for(int x=0; x < 8; x++) { addObject(new Water(),x,y); } } } public void maakDijk() { for(int y = 3; y < 6; y++) { for(int x=0; x < 8; x++) { addObject(new Dijk(),x,y); } } } public void maakGras() { for(int y = 6; y < 8; y++) { for(int x=0; x < 8; x++) { addObject(new Gras(),x,y); } } } } Hope you can help me out, Greetings, Zakaria
Gevater_Tod4711 Gevater_Tod4711

2012/12/1

#
I'm not sure if I understood your right but if you just want to print the method when you have reached a specific coordinate you could just use "if" to check if you have addet an object on this position like this: 
 if (elapsedTime / 1000 > 0.1) {
    timeStarted = currentTime; addObject(new Water(),x,y);
    x++;
    if (x == 8) {
        y++;
        x = 0;
    }
    if (x = targetX && y = targetY) {
        Greenfoot.stop() //or whatever you want to do in this case;
    }
}
zakariaonlyy zakariaonlyy

2012/12/1

#
Yes that is what i want to do, when i reach a specific coordinate i want it to print out a string. When i apply the if statement you wrote up here it tells me, cannot find symbol- variable targetX. It will probably be the same for target y. What does the targetX stand for? And how do i define the specific coordinates?
zakariaonlyy zakariaonlyy

2012/12/1

#
Pardon me for being a noob and thanks for helping out !
Gevater_Tod4711 Gevater_Tod4711

2012/12/1

#
targetX is not declared in your code. It just stands for the xCoordinate you want to reach (targetY is for the y coordinate). If you just delete the targetX and write the x coordinate you want to reach and do the same for targetY it'll work.
zakariaonlyy zakariaonlyy

2012/12/1

#
I understand :D so i have declared int targetX=8; and int targetY=8; When i compile it still tells me that the && is a problem cause it says : bad operand types for binary operators "&&" any ideas? code looks like this : private long timeStarted = System.currentTimeMillis(); int x=0; int y=3; int targetX = 8; int targetY = 8; public void act() { long currentTime = System.currentTimeMillis() ; long elapsedTime = currentTime - timeStarted; if (elapsedTime / 1000 > 0.1) { timeStarted = currentTime; addObject(new Water(),x,y); x++; if (x == 8){ y++; x = 0; } if ( x = targetX && y = targetY) { Greenfoot.stop(); //or whatever you want to do in this case; } //if (getOneObjectAtOffset(8, 8, Water.class)!= null){ //System.out.print("Dijkdoorbraak"); //Greenfoot.stop(); // } } }
danpost danpost

2012/12/1

#
You need to use the equal comparison symbol '==' in the 'if' conditions.
zakariaonlyy zakariaonlyy

2012/12/1

#
Works perfectly ! Thanks for helping out guys!
zakariaonlyy zakariaonlyy

2012/12/5

#
Guys any idea how to store the element Dijk in an array? i know how to create an array, but how do i put an already existing object in an array?
Gevater_Tod4711 Gevater_Tod4711

2012/12/5

#
you have to use a array from the type of the object you want to put in. The rest is all the same like in every array: 
Dijk[] array = new Dijk[numberOfElements];

Dijk[anyFieldOfTheArray] = new Dijk(); //or any other object you want to add to this position.
vonmeth vonmeth

2012/12/5

#
I believe this 
Dijk[anyFieldOfTheArray] = new Dijk(); //or any other object you want to add to this position.
should actually be 
array[anyFieldOfTheArray] = new Dijk(); //or any other object you want to add to this position.
Gevater_Tod4711 Gevater_Tod4711

2012/12/6

#
oh right. you have to use the name of the array (in this case array) if you want to get one of the fields. thank you vonmeth.
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