Swiftui component Encyclopedia: using scenekit and swiftui to build interactive 3D pie charts (tutorial with source code)

Use of this month SceneKit structure 3D It is very meaningful to do the same for pie charts . besides , This is also a careful study SceneKit A good opportunity for other aspects of the framework .

code

I started like this … Of course , Search for a good SCNShape Implementation example . The first goal is to build slices using the basic code described here .

Please note that , Even though Apple Call this a Bessel path —— It seems to be just a path .

let coreNode = SCNNode()
coreNode.simdPosition = SIMD3(x:0,y:0,z:0)
scene?.rootNode.addChildNode(coreNode)

coreNode.simdPivot.columns.3.z = 1

bezierPath3.move(to: CGPoint(x: 0, y: 0))
let radians = Double(startAngle) * Double.pi / 180.0
let x = Double(center.x) + Double(radius.width) * Double(cos(radians))
let y = Double(center.y) + Double(radius.height) * sin(radians)
bezierPath3.addLine(to: CGPoint(x: x, y: y))

let radians3 = Double(endAngle/2) * Double.pi / 180.0
let x3 = Double(center.x) + Double(radius.width) * Double(cos(radians3))
let y3 = Double(center.y) + Double(radius.height)