title: Changing center point of SKPhysicsBody while using 'bodyWithTexture' (SpriteKit)
body: <p>It seems like the Spritekit's API does not allow to change the center of the physicsbody when using 'bodyWithTexture' (or maybe I'm missing something).</p>
  
  <p>I'm wondering how you get around this when using a pixel precision physicsbody.</p>
  
  <pre><code>//Upper Claw
  SKSpriteNode *claw = [SKSpriteNode spriteNodeWithImageNamed:BOSS_CLAW_SPRITE];
  claw.position = CGPointMake(800, 520);
  claw.anchorPoint = CGPointMake(1, .7);
  
  //physics
  claw.physicsBody = [SKPhysicsBody bodyWithTexture:claw.texture size:claw.size];
  </code></pre>
  
  <p>You can clearly see that the physicsbody's center position is where the anchor point is. 
  <img src="https://i.stack.imgur.com/Ra7q4.jpg" alt="enter image description here"></p>
  
  <p>Alternatively, bodyWithCircle / bodyWithRectangle have a 'center' property. However, it isn't as precise and needs a lot of code to make (unscalable).</p>
  
  <pre><code>-(SKPhysicsBody*)getPhysicsForClaw:(BOOL)isUpperClaw
  {
       NSInteger reverseConstant = 1;
       if (!isUpperClaw) {
           reverseConstant = -1;
       }
       SKPhysicsBody *clawTip1 = [SKPhysicsBody bodyWithCircleOfRadius:5 center:CGPointMake(-545, -140*reverseConstant)];
       SKPhysicsBody *clawTip2 = [SKPhysicsBody bodyWithCircleOfRadius:6 center:CGPointMake(-540, -130*reverseConstant)];
       SKPhysicsBody *clawTip3 = [SKPhysicsBody bodyWithCircleOfRadius:7 center:CGPointMake(-535, -120*reverseConstant)];
       SKPhysicsBody *clawTip4 = [SKPhysicsBody bodyWithCircleOfRadius:8 center:CGPointMake(-530, -110*reverseConstant)];
       SKPhysicsBody *clawTip5 = [SKPhysicsBody bodyWithCircleOfRadius:8 center:CGPointMake(-525, -100*reverseConstant)];
       SKPhysicsBody *clawTip6 = [SKPhysicsBody bodyWithCircleOfRadius:9 center:CGPointMake(-515, -90*reverseConstant)];
       SKPhysicsBody *clawTip7 = [SKPhysicsBody bodyWithCircleOfRadius:11 center:CGPointMake(-508, -78*reverseConstant)];
       SKPhysicsBody *clawTip8 = [SKPhysicsBody bodyWithCircleOfRadius:12 center:CGPointMake(-495, -65*reverseConstant)];
       SKPhysicsBody *clawTip9 = [SKPhysicsBody bodyWithCircleOfRadius:13 center:CGPointMake(-480, -50*reverseConstant)];
       SKPhysicsBody *clawTip10 = [SKPhysicsBody bodyWithCircleOfRadius:14 center:CGPointMake(-465, -35*reverseConstant)];
  
       SKPhysicsBody *clawTeeth1 = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(6, 40) center:CGPointMake(-433, -70)];
       SKPhysicsBody *clawTeeth2 = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(15, 20) center:CGPointMake(-420, -60)];
       SKPhysicsBody *clawTeeth3 = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(9, 40) center:CGPointMake(-395, -70)];
       SKPhysicsBody *clawTeeth4 = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(15, 20) center:CGPointMake(-382, -60)];
       SKPhysicsBody *clawTeeth5 = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(9, 40) center:CGPointMake(-345, -70)];
       SKPhysicsBody *clawTeeth6 = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(10, 20) center:CGPointMake(-334, -60)];
       SKPhysicsBody *clawTeeth7 = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(9, 30) center:CGPointMake(-295, -60)];
       SKPhysicsBody *clawTeeth8 = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(9, 30) center:CGPointMake(-255, -42)];
  
       SKPhysicsBody *clawBody1 = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(100, 45) center:CGPointMake(-400, -30)];
       SKPhysicsBody *clawBody2 = [SKPhysicsBody bodyWithCircleOfRadius:26 center:CGPointMake(-325, -25*reverseConstant)];
       SKPhysicsBody *clawBody3 = [SKPhysicsBody bodyWithCircleOfRadius:28 center:CGPointMake(-290, -12*reverseConstant)];
       SKPhysicsBody *clawBody4 = [SKPhysicsBody bodyWithCircleOfRadius:29 center:CGPointMake(-250, 0*reverseConstant)];
       SKPhysicsBody *clawBody5 = [SKPhysicsBody bodyWithCircleOfRadius:28 center:CGPointMake(-210, 10*reverseConstant)];
       SKPhysicsBody *clawBody6 = [SKPhysicsBody bodyWithCircleOfRadius:30 center:CGPointMake(-165, 24*reverseConstant)];
  
       SKPhysicsBody *clawBase1 = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(120, 55) center:CGPointMake(-75, 24)];
  
       SKPhysicsBody *claw = [SKPhysicsBody bodyWithBodies:@[clawTip1, clawTip2, clawTip3, clawTip4, clawTip5, clawTip6, clawTip7, clawTip8, clawTip9, clawTip10, clawTeeth1, clawTeeth2, clawTeeth3, clawTeeth4, clawTeeth5, clawTeeth6, clawTeeth7, clawTeeth8, clawBody1, clawBody2, clawBody3, clawBody4, clawBody5, clawBody6, clawBase1]];
  
       return claw;
   }
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/Bah50.jpg" alt="enter image description here"></p>