CODEWITHSUNDEEP
xcodeioscocos2d-iphone
John
John

Reputation: 393

Cocos2D sprite constrained to screen

I'm having a problem with Cocos2D. I'm trying to have a sprite movable on screen (which I've been able to do), but stop it from being clipped by the edge of the screen.

If I'm correct, sprites are imported to the layer as rectangles (spriteWithFile:@"filename.ext" rect:CGRectMake(0, 0, X, Y);).

The only thing I've been able to figure out so far is to setup my code to detect if the rectangle of the sprite has gone outside of the "background" layer, and adjust it accordingly if it does.

This is what I have so far, but it doesn't seem to be working correctly: 

- (void)panForTranslation:(CGPoint)translation {    

    CGSize winSize = [CCDirector sharedDirector].winSize;

    float maxX = winSize.width - selSprite.contentSize.width/2;
    float minX = selSprite.contentSize.width/2;
    float maxY = winSize.height - selSprite.contentSize.height/2;
    float minY = selSprite.contentSize.height/2;

    if (selSprite.position.x > maxX)
    {
        selSprite.position = ccp(maxX, selSprite.position.y);
    }
    else if (selSprite.position.x < minX)
    {
        selSprite.position = ccp(minX, selSprite.position.y);
    }   

    if (selSprite.position.y > maxY)
    {
        selSprite.position = ccp(selSprite.position.x, maxY);
    }
    else if (selSprite.position.y < minY)
    {
        selSprite.position = ccp(selSprite.position.x, minY);
    }

    CGPoint newPos = ccpAdd(selSprite.position, translation);
    selSprite.position = newPos;

}

Is there something completely obvious that I'm missing? My sprites keep moving off screen if I drag them, and I can't figure it out for the life of me.

Upvotes: 1

Views: 1454

Answers (2)

NeverHopeless
NeverHopeless

Reputation: 11233

I have a sprite which is larger in size than the screen size. I used this:

node.position = CGPointMake(MIN(MAX(size.width  - node.contentSize.width /2,node.position.x), node.contentSize.width  / 2),
                            MIN(MAX(size.height - node.contentSize.height/2,node.position.y), node.contentSize.height / 2));

Using this code, my sprite corner was either outside the screen or at the edge of the screen which helped me to see my complete image by scrolling it.

Here:

node = CCSprite
size = [[CCDirector sharedDirector] winSize]

Upvotes: 0

Andrew
Andrew

Reputation: 24846

Try this:

float maxX = winSize.width - selSprite.contentSize.width/2;
float minX = selSprite.contentSize.width/2;
float maxY = ...;
float minY = ...;

if (selSprinte.position.x > maxX)
{
    selSprite.position = ccp(maxX, selSprite.position.y);
}
else if (selSprinte.position.x < minX)
{
    selSprite.position = ccp(minX, selSprite.position.y);
}


if (selSprinte.position.y > maxY)
{
    selSprite.position = ccp(selSprite.position.x, maxY);
}
else if (selSprinte.position.y < minY)
{
    selSprite.position = ccp(selSprite.position.x, minY);
}

and add the same code for y.

Upvotes: 2

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