检测cocos2d中sprite的透明部分？ [英] Detect transparent part on the sprite in cocos2d?

问题描述

我是Cocos2d的初学者。我有一个sprite，我想忽略对该sprite的透明区域的触摸。

我知道这个答案 Cocos2d 2.0 - 忽略对层/ sprite的透明区域的触摸，精彩文章 http://www.learn-cocos2d.com / 2011/12 / fast-pixelperfect-collision-detection-cocos2d-code-1of2 / 。

我可以使用KKPixelMaskSprite，只有当sprite是从文件使用，而不是从批处理节点。每当我使用批处理节点（Sprite sheet），得到精灵，它停止工作。

我有不同的精灵对方，我想检测这种方式 - > if touch是在当前的sprite边框，是部分透明的sprite还是没有？

PSI'm使用cocos2d 1.0。我现在不想使用任何物理引擎，我只想忽略sprite透明区域（这是使用批处理节点创建的）。我该怎么办？

解决方案

您可以使用CGMutablePathRef进行非矩形子画面碰撞检测。

//检查

  CGPoint loc = [mySprite convertToNodeSpace：touchPoint]; 
 
 if（[mySprite isPointInsideMap：loc]）
 {
 //接触内部.. 
} 
 
 //添加此方法在你的MySprite类派生自CCSprite。 
  - （bool）isPointInsideMap：（CGPoint）inPoint 
 {
 if（CGPathContainsPoint（mCollisionPath，NULL，inPoint，NO））
 {
 return true; 
} 
 
 return false; 
} 
  

////创建路径

  CGMutablePathRef mCollisionPath = CGPathCreateMutable（）; 
 CGPathMoveToPoint（mCollisionPath，NULL，0，0）; 
 CGPathAddLineToPoint（mCollisionPath，NULL，11，82）; 
 CGPathAddLineToPoint（mCollisionPath，NULL，42，152）; 
 CGPathAddLineToPoint（mCollisionPath，NULL，86，202）; 
 CGPathAddLineToPoint（mCollisionPath，NULL，169，13）; 
 CGPathCloseSubpath（mCollisionPath）; 
  

I'm beginner in Cocos2d. I have a sprite, and I want to ignore touch on transparent area of that sprite.

I'm aware of this answer Cocos2d 2.0 - Ignoring touches to transparent areas of layers/sprites, and also this great article http://www.learn-cocos2d.com/2011/12/fast-pixelperfect-collision-detection-cocos2d-code-1of2/.

I was able to make it work with KKPixelMaskSprite, but only when sprite is used from file, but not from batch node. Whenever I use batch node (Sprite sheet), to get sprite , it stops working.

I have different sprites on each other, and I want detect this way -> if touch is in current sprite bounding box, is that part transparent on sprite or no?

P.S.I'm using cocos2d 1.0. I don't want to use any Physics engine for now, I just want to ignore touches on transparent areas of sprite (that was created using batch node ) .How can I do that? Or might there any tool can be helpfull?

Thanks a lot in advance.

解决方案

You can use CGMutablePathRef to make non-rectangular sprite collision detection.

//checking

    CGPoint loc =[mySprite convertToNodeSpace:touchPoint];

    if([mySprite isPointInsideMap:loc]) 
    {
         //touched inside..
    }

//Add this method in your MySprite class derived from CCSprite.
-(bool)isPointInsideMap:(CGPoint)inPoint
{
    if (CGPathContainsPoint(mCollisionPath, NULL, inPoint, NO) ) 
    {
        return true;
    }

    return false;
}

////Create Path

CGMutablePathRef  mCollisionPath = CGPathCreateMutable();
CGPathMoveToPoint(mCollisionPath,    NULL,  0, 0 );
CGPathAddLineToPoint(mCollisionPath, NULL,   11, 82 );
CGPathAddLineToPoint(mCollisionPath, NULL,   42, 152 );
CGPathAddLineToPoint(mCollisionPath, NULL,   86, 202 );
CGPathAddLineToPoint(mCollisionPath, NULL,   169, 13 );
CGPathCloseSubpath(mCollisionPath);

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