如何使用纹理绘制一个圆形的SKSpriteNode？

Question

有没有一种方法可以绘制带有纹理的圆形SKSpriteNode？或者，用纹理绘制SKShapeNode的方法呢？

- Lim Thye Chean

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你能把纹理做成圆角的吗？ - Sweeper

纹理实际上是由用户现场选择的，因此它们不能是圆形的。 - Lim Thye Chean

“带纹理”是什么意思？有几种方法可以创建圆形精灵。 - 0x141E

Answer 1

需要考虑的是所有的图片都是矩形/正方形。我们所看到的圆形，实际上只是显示彩色像素的方法：圆形外部是透明的，内部是彩色的部分。

1. we need a circle
2. we texture it
3. we add it to the scene
4. we take back a new texture from this shape node that we just added to the scene
5. we make a new sprite using this new texture

6. we add the sprite to the scene

   let shape: SKShapeNode = SKShapeNode(circleOfRadius: 50)
   shape.name = "shape"
   shape.lineWidth = 1 // this way we see that this is a circle
   shape.fillColor = .white // to see the true colors of our image
   //shape.strokeColor = .white
   //shape.glowWidth = 0
   shape.fillTexture = SKTexture(imageNamed:"myImage")
   shape.position = CGPoint(x: 0, y:200)
   self.addChild(shape)
   
   let newTexture: SKTexture = (self.view?.texture(from: self.childNode(withName: "shape")!))!
   let sprite: SKSpriteNode = SKSpriteNode(texture: newTexture)
   self.addChild(sprite) 
   
   shape.removeFromParent()
   

- hungry

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您可以通过 view?.texture(from: shape) 来创建一个纹理，而不必将其添加到场景中。 - 0x141E