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verify rotation matrix in spec

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should contain cos and sin of the angle
This commit is contained in:
Paul Zabelin
2018-01-31 23:49:20 -08:00
parent a29cb0edbd
commit 2717dfc361
1 changed files with 20 additions and 0 deletions
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20
Example/Tests/ProjectionSpec.swift
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@@ -62,6 +62,26 @@ class ProjectionSpec: QuickSpec {
let projection = from.projection(to: to)
expect(CATransform3D(projection.to3d())) == combined
}
context("matrix values") {
var matrix: CATransform3D!
beforeEach {
let projection = from.projection(to: to)
matrix = CATransform3D(projection.to3d())
}
it("should contain rotation around z axis") {
let angle = CGFloat.pi / 2
expect(matrix.m11) ≈ cos(angle)
expect(matrix.m22) ≈ cos(angle)
expect(matrix.m33) == 1
expect(matrix.m12) ≈ sin(angle)
expect(matrix.m21) ≈ -sin(angle)
expect(matrix.m13) == 0
expect(matrix.m31) == 0
}
}
}
context("scale and translate") {