如何为doting图像设置physicsBody？

Question

当我将physicsBody设置为带有完整圆圈的图像时，它可以正常工作！ 喜欢：

sprite.physicsBody = [SKPhysicsBody bodyWithTexture:sprite.texture size:sprite.size];

  

http://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Circle_-_black_simple.svg/220px-Circle_-_black_simple.svg.png

但如果我有点像这样的图像，如何设置physicsBody：

  

http://www.i2symbol.com/images/symbols/geometry/dotted_circle_u25CC_icon_256x256.png

Answer 1

这会给你你想要的东西。只需要添加图形。您可能还想将它们添加到父级精灵中。复制并粘贴它以检查它，然后根据您的需要调整它。希望它有所帮助：）

let centerPoint = CGPoint(x: self.size.width/2, y: self.size.height/2)

for i in 1...8 {

    let circleSection = SKSpriteNode(color: SKColor.redColor(), size: CGSize(width: 30, height: 10))
    circleSection.physicsBody = SKPhysicsBody(rectangleOfSize: circleSection.size)

    let angle = CGFloat(M_PI_4) * CGFloat(i)
    let distFromCtr = CGFloat(100)
    var angleToPt = CGPoint(
        x: cos(angle) * distFromCtr,
        y: sin(angle) * distFromCtr
    )

    angleToPt.x += centerPoint.x
    angleToPt.y += centerPoint.y

    circleSection.position = angleToPt
    circleSection.zRotation = angle + CGFloat(M_PI_2)
    self.addChild(circleSection)
}