random sprite position

[phantomsri]

hi i have a game, right now i need a advice how to code a code.

I have 4 sprites in a 2x2 arrangement. all the sprite is different.
How can i random/mix the position when i load the layer?

So far I have done this code. Is there a simpler way or this method im using is correct? I have plans to load more sprites in 5X5 arrangement.

CGPoint grid1 =ccp(60,210);
CGPoint grid2 =ccp(60,280);
CGPoint grid3 =ccp(180,210);
CGPoint grid4 =ccp(180,280);

sprite1 =[CCSprite spriteWithFile:@"sprite1"];
sprite2 =[CCSprite spriteWithFile:@"sprite2"];
sprite3 =[CCSprite spriteWithFile:@"sprite3"]; 
sprite4 =[CCSprite spriteWithFile:@"sprite4"];

int randomLocation = (arc4random() % 4) + 1;

switch(randomLocation)
{
case 1:

sprite1.position=grid1;
sprite1.position=grid2;
sprite1.position=grid3;
sprite1.position=grid4;

break;

case 2:

sprite1.position=grid2;
sprite1.position=grid3;
sprite1.position=grid1;
sprite1.position=grid4;

break;

case 3:
sprite1.position=grid4;
sprite1.position=grid1;
sprite1.position=grid2;
sprite1.position=grid3;

break;

case 4:
sprite1.position=grid4;
sprite1.position=grid3;
sprite1.position=grid2;
sprite1.position=grid1;

break;
}

[self addChild:sprite1];
[self addChild:sprite2];
[self addChild:sprite3];
[self addChild:sprite4];

[Justinmichael]

As I think you are finding out, code like this will work, but becomes unmanageable.

Try reading up on Object Oriented Programming as there are many ways you can make this more manageable.

Object-oriented programming - Wikipedia, the free encyclopedia

[headkaze]

I think a CCSprite is a Cocos2D sprite object. If so set up a multidimensional array of CCSprite objects. That way you can have rows and columns of sprites. Rather than randomly set their position, randomly select their skin ("texture"). To set their position use...

for(int y=0; y<NUM_ROWS; y++)
    for(int x=0; x<NUM_COLS; x++)
        // Set position to x * WIDTH_OF_SPRITE, y * HEIGHT_OF_SPRITE

For the random skin, have an array of skins and randomly select one and set it for each sprite.

PS Learning OOP certainly wouldn't hurt

[new2objectivec]

Originally Posted by phantomsri

hi i have a game, right now i need a advice how to code a code.

I have 4 sprites in a 2x2 arrangement. all the sprite is different.
How can i random/mix the position when i load the layer?

So far I have done this code. Is there a simpler way or this method im using is correct? I have plans to load more sprites in 5X5 arrangement.

How about create 2 arrays: 1st for the grid, 2nd for the sprite.
when assigning values to 2nd array, set the position to a special value (0,0 or something special)

then use the random function to assign each of them to one of the grids, if the "position" of that sprite is that special value, you know it's not been assigned yet and can be safely updated.

hope this helps

[phantomsri]

Originally Posted by new2objectivec

How about create 2 arrays: 1st for the grid, 2nd for the sprite.
when assigning values to 2nd array, set the position to a special value (0,0 or something special)

then use the random function to assign each of them to one of the grids, if the "position" of that sprite is that special value, you know it's not been assigned yet and can be safely updated.

hope this helps

sorry im a little confused. Are you reffering to use NSarrays?
can help provide a little sample code.
im still learning on cocos2d ios dev.

[new2objectivec]

2nd try, probably something like this:

#define maxAry 4

CGPoint grid[maxAry];
Sprite sprite[maxAry];    // this might not be right as it wasn't specified in your original code what data type the sprites are

-(void)randomAssign {
	BOOL assigned[maxAry];
	int jj,kk;

	//initialize
	for (int ii=0; ii<maxAry; ii++) {
		assigned[ii]=NO;
	}
	
	jj=0;
	kk=0;
	do {
		kk = arc4random() % maxAry;

		if (!assigned[kk]) {
			sprite[jj].position=grid[kk];
			assigned[kk]=YES;
			jj++;	
		}
		
	} while (jj<maxAry)
	
}

//in the main code area

[self randomAssign];