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POContinuous scrolling sprite on iOS GLKit gap between sprites
 

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  1. POContinuous scrolling sprite on iOS GLKit gap between sprites
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    <p>I have been trying to create a Class for my OpenGL ES 2.0 + GLKit game on iOS. When I increase the speed of the scrolling, the gap between the sprites gets larger. I have done a lot of searching on Google but have not found an answer that has worked for me.</p> <p>My Scrolling sprite class inherits from a 'Node' with position, scale, children etc. (a bit like Cocos2D). The class has an array of sprites (nodes), that move with the set velocity on the x axis and when reaching the end of the screen move to the right position of the last sprite.</p> <p>Here is the main part of my code:</p> <pre><code> -(id)initWithTexture:(GLKTextureInfo *)texture effect:(GLKBaseEffect *)effect xScrollRange:(float)range yPosition:(float)y xScrollVelocity:(float)velocity{ if (self = [super init]) { //set globals self.velocity = velocity; xRange = range; //create a first sprite, set position, add to children JGSprite *firstSprite = [[JGSprite alloc] initWithTexture:texture effect:effect]; firstSprite.position = GLKVector2Make(range, y); [self.children addObject:firstSprite]; //calc how many sprites are needed to cover range+1 float spritesNum = range/firstSprite.contentSize.width; int spritesNumRound = roundf(spritesNum)+1; //add enough sprites to cover the screen for (int i = 1; i &lt; spritesNumRound; i++) { //create, set position, add to children JGSprite *sprite = [[JGSprite alloc] initWithTexture:texture effect:effect]; sprite.position = GLKVector2Make(range - (i*sprite.contentSize.width), y); [self.children addObject:sprite]; } //if moving left, set last sprite as right most if (velocity &lt; 0) lastReorderedSprite = 0; else //set left most lastReorderedSprite = self.children.count-1; } return self; } -(void)update:(float)dt { //loop through sprites for (JGNode *node in self.children) { //update sprites position node.position = GLKVector2Make(node.position.x + self.velocity*dt, node.position.y); //if moving left if (self.velocity &lt; 0) { //if reached gone off screen if (node.position.x &lt;= -node.contentSize.width/2) { //get last node JGNode *lastSprite = [self.children objectAtIndex:lastReorderedSprite]; //set the position to the right of the last node node.position = GLKVector2Make(lastSprite.position.x+lastSprite.contentSize.width, node.position.y); //set re-positioned node as lastreordered lastReorderedSprite = [self.children indexOfObject:node]; } } else //moving right { //gone off screen if (node.position.x &gt;= xRange+node.contentSize.width/2) { //get last node JGNode *lastSprite = [self.children objectAtIndex:lastReorderedSprite]; //set the position to the left of the last node node.position = GLKVector2Make(lastSprite.position.x-node.contentSize.width, node.position.y); //set re-positioned node as lastreordered lastReorderedSprite = [self.children indexOfObject:node]; } } } } </code></pre> <p>If anyone could help by telling me how I would go about stopping a gap forming, it would be much appreciated :) Thanks in advance!</p>
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