Swift：使相同颜色的半透明重叠线在交叉时不会改变颜色

目前我在屏幕上绘制了两条相同颜色的线,但两者的alpha值都小于1.当这些线相交时,交点与其他线的颜色不同.之前的帖子解决了同一个问题： swift drawing translucent lines,how to make overlapping parts not getting darker?但是,这篇文章没有得到充分的回答.我画的线条目前是这样的：

var points = [CGPoint]()

    points = [CGPoint(x: -100,y: 100),CGPoint(x: 100,y: -100)]
    let FirstLine = SKShapeNode(points: &points,count: points.count)
    FirstLine.strokeColor = UIColor.init(red: 0.25,green: 0.62,blue: 0.0,alpha: 0.5)
    FirstLine.lineWidth = 30
    addChild(FirstLine)

    points = [CGPoint(x: 100,CGPoint(x: -100,y: -100)]
    let SecondLine = SKShapeNode(points: &points,count: points.count)
    SecondLine.strokeColor = UIColor.init(red: 0.25,alpha: 0.5)
    SecondLine.lineWidth = 30
    addChild(SecondLine)

这是它的样子：

我理解为什么会发生这种情况,但有没有办法让交叉点看起来一样,所以它看起来好多了？

编辑：我已决定实施@ Confused的答案.但是,现在的问题是纹理始终以屏幕中间为中心.这是一个例子：

红十字处于正确的位置,因为它将指定的点连接在一起.然而,一旦我将红十字作为纹理,它总是居中于屏幕的中间(绿色十字是红十字作为纹理).我可以使用任何可以将纹理重新定位到正确位置的代码.注意：此代码不能仅适用于此示例,我需要一个无论红十字位置如何都能正常工作的代码.

对具有相同问题的人的最终编辑

首先,设置如下所示：

var points = [CGPoint]()
let crossParent = SKNode()
addChild(crossParent)

请注意,您必须为纹理创建父SKNode,否则屏幕上的所有内容都将成为纹理,而不仅仅是您想要的节点.然后,将该父节点添加到场景中.

之后,创建所需的行(在本例中为绿色十字)：

//The first line of the green cross
points = [CGPoint(x: -300,y: 300),y: 100)]
let FirstLine = SKShapeNode(points: &points,count: points.count)
FirstLine.strokeColor = UIColor.init(red: 0.25,alpha: 1.0)
FirstLine.lineWidth = 30
crossParent.addChild(FirstLine)

请记住,不要将您创建的第一行添加到场景中,而是添加到您在开头创建的父SKNode.另外,为绘制的每一行设置alpha值为1.0.然后添加其他行：

//The second line of the green cross
points = [CGPoint(x: -100,CGPoint(x: -300,y: 100)]
let SecondLine = SKShapeNode(points: &points,count: points.count)
SecondLine.strokeColor = UIColor.init(red: 0.25,alpha: 1.0)
SecondLine.lineWidth = 30
FirstLine.addChild(SecondLine)

请注意,您必须将该行添加到第一行,而不是像场景一样.如果您在添加第一行后添加多行,则将其添加到第一行,就像我在此处每次连续一样
你添加的行.

现在,创建如下纹理：

let tex = view?.texture(from: FirstLine)
 let cross = SKSpriteNode(texture: tex,color: .clear,size: (tex?.size())!)
 cross.alpha = 0.5
 addChild(cross)

完成此操作后,无论你调用十字架都将是你的纹理,你可以像我在这里所做的那样将alpha值更改为你想要的任何颜色并且图像不会有不同的颜色.记得然后将该纹理添加到场景中.

最后,您可能会注意到纹理与最初放置点的位置不在同一位置.你可以把它放回到这样的位置：

cross.position = CGPoint(x: (FirstLine.frame.midX),y: (FirstLine.frame.midY))

希望这有帮助:)感谢@Confused程序的纹理部分：D

var points = [CGPoint]()

   points = [CGPoint(x: -100,y: -100)]
   let FirstLine = SKShapeNode(points: &points,count: points.count)
   FirstLine.strokeColor = UIColor.init(red: 0.25,alpha: 1)
   FirstLine.lineWidth = 30
//      ^^ Note the FirstLine is not added to the Scene

   points = [CGPoint(x: 100,y: -100)]
   let SecondLine = SKShapeNode(points: &points,count: points.count)
   SecondLine.strokeColor = UIColor.init(red: 0.25,alpha: 1)
   SecondLine.lineWidth = 30
   FirstLine.addChild(SecondLine)
// ^^ Note SecondLine being added to FirstLine,and that they both have alpha of 1

// Now the magic: use the view of the SKScene to render FirstLine and its child (SecondLine)
// They are rendered into a texture,named,imaginatively,"tex"

   let tex = view.texture(from: FirstLine)
   let cross = SKSpriteNode(texture: tex,size: (tex?.size())!)
       cross.alpha = 0.5

// ^^ The alpha of the above sprite is set to your original desire of 0.5
// And then added to the scene,with the desired result.
   addChild(cross)