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[Math] Add translation, scale, and rotation about single axis constructors for Matrix4

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Eryn Wells 2015-11-01 20:15:13 -08:00
parent 95560b8a8a
commit f6740cae06
1 changed files with 48 additions and 0 deletions
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48
Math/Math/Matrix.swift
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@ -77,6 +77,54 @@ public struct Matrix4: Matrix {
}
init(translationWithX x: Float, y: Float, z: Float) {
// NOTE: Call will never fail.
try! self.init(values: [1, 0, 0, x,
0, 1, 0, y,
0, 0, 1, z,
0, 0, 0, 1])
}
init(scaleWithX x: Float, y: Float, z: Float) {
// NOTE: Call will never fail.
try! self.init(values: [x, 0, 0, 0,
0, y, 0, 0,
0, 0, z, 0,
0, 0, 0, 1])
}
init(rotationAboutX x: Float) {
let c = cos(x)
let s = sin(x)
try! self.init(values: [1, 0, 0, 0,
0, c, s, 0,
0, -s, c, 0,
0, 0, 0, 1])
}
init(rotationAboutY y: Float) {
let c = cos(y)
let s = sin(y)
try! self.init(values: [c, 0, -s, 0,
0, 1, 0, 0,
s, 0, c, 0,
0, 0, 0, 1])
}
init(rotationAboutZ z: Float) {
let c = cos(z)
let s = sin(z)
try! self.init(values: [ c, s, 0, 0,
-s, c, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1])
}
init(rotationAboutX x: Float, y: Float, z: Float) {
let r = Matrix4(rotationAboutX: x) * Matrix4(rotationAboutY: y) * Matrix4(rotationAboutZ: z)
try! self.init(values: r.data)
}
public static var dimension: Int {
return 4
}