Question

在here的帮助下，我制作了一个圆形体遍历给定的路径。我在某些路径点上有一些尸体，并在didBeginContact中记录了联系人。当身体与特定身体接触时，圆体变为矩形。该矩形体假设穿过与原始圆体相同的路径，但由于未记录接触，因此它不会到达路径点。我尝试将radiusPoint更改为矩形的宽度或高度，但这并不起作用。矩形体也比圆体大。如何通过识别出的联系方式让矩形遍历点？请参阅下面的代码。

与路径遍历相关的代码：

    let repeats: Bool = true //Whether to repeat the path.
    var pathIndex = 0 //The index of the current point to travel.
    var pointRadius: CGFloat = SKTexture(imageNamed: "circle").size().width //How close the node must be to reach the destination point.
    let travelSpeed: CGFloat = 250 //Speed the node will travel at.
    let rate: CGFloat = 0.9 //Motion smoothing. 0.5

    circlePath = [
    CGPoint(x:screenSize.width , y: screenSize.height/3),
    CGPoint(x: screenSize.width/2, y: platform.sprite.frame.height),
    CGPoint(x: 0.0, y: screenSize.height/3),
    CGPoint(x: CGFloat(pos1) + screenSize.width/20, y: upperSpearPosHeight)]

    final func didReachPoint() {
    //reached point!
    pathIndex++

    if pathIndex >= ballPath.count && repeats {
    pathIndex = 0
    }
    }

    func updatePath() {

    if pathIndex >= 0 && pathIndex < circlePath.count {
    let destination = circlePath[pathIndex]
    //currentPosition = destination
    let displacement = CGVector(dx: destination.x-circle!.sprite.position.x, dy: destination.y-circle!.sprite.position.y)
    let radius = sqrt(displacement.dx*displacement.dx+displacement.dy*displacement.dy)
    let normal = CGVector(dx: displacement.dx/radius, dy: displacement.dy/radius)
    let impulse = CGVector(dx: normal.dx*travelSpeed, dy: normal.dy*travelSpeed)
    let relativeVelocity = CGVector(dx:impulse.dx-circle!.sprite.physicsBody!.velocity.dx, dy:impulse.dy-circle!.sprite.physicsBody!.velocity.dy);
    circle!.sprite.physicsBody!.velocity=CGVectorMake(circle!.sprite.physicsBody!.velocity.dx+relativeVelocity.dx*rate, circle!.sprite.physicsBody!.velocity.dy+relativeVelocity.dy*rate);

    if radius < pointRadius {
        didReachPoint()
        }
        }
    }

联系代码：

        func didBeginContact(contact: SKPhysicsContact) {
    var firstBody : SKPhysicsBody
    var secondBody : SKPhysicsBody

    if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask  {
    firstBody = contact.bodyA
    secondBody = contact.bodyB
    }
    else    {
    firstBody = contact.bodyB
    secondBody = contact.bodyA
    }

            if firstBody.categoryBitMask == circleCategory && secondBody.categoryBitMask == bonusCategory  {
    let img = SKTexture(imageNamed: "rectangular")
   (firstBody.node! as? SKSpriteNode)?.size = img.size()       
   firstBody.node!.physicsBody = SKPhysicsBody(texture: img, size: img.size())
   firstBody.node!.physicsBody?.allowsRotation = false 
   changeCircleAction = SKAction.setTexture(img)   
   firstBody.node!.runAction(changeCircleAction)
 }

    if firstBody.categoryBitMask == circleCategory && secondBody.categoryBitMask == platformCategory  {

    print("touched platform")
    }

    if firstBody.categoryBitMask == circleCategory && secondBody.categoryBitMask == smallStarCategory  {

    removeStar(secondBody.node!)
    }

Answer 1

似乎当您将firstBody更改为矩形（在didBeginContact方法中）时，您不会设置位掩码。根据您的描述，您似乎希望将其设置为circleCategory：

firstBody.node!.physicsBody?.categoryBitMask = circleCategory

我会把它放在firstBody.node!.physicsBody?.allowsRotation = false下面。

当body从圆圈变为矩形时，无法识别联系人

1 个答案: