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#159 Test whether Matrix.Unprejected(Matrix.Projected(vertex)) == vertex

This commit is contained in:
Jacek Olszak 2019-02-13 14:39:47 +01:00
parent 2e0da4f44a
commit 392fe90b11
1 changed files with 42 additions and 7 deletions
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49
geometry_test.go
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@ -81,7 +81,7 @@ func TestResizeRect(t *testing.T) {
}
func TestMatrix_Unproject(t *testing.T) {
const delta = 4e-16
const delta = 1e-15
t.Run("for rotated matrix", func(t *testing.T) {
matrix := pixel.IM.
Rotated(pixel.ZV, math.Pi/2)
@ -91,16 +91,16 @@ func TestMatrix_Unproject(t *testing.T) {
})
t.Run("for moved matrix", func(t *testing.T) {
matrix := pixel.IM.
Moved(pixel.V(5, 5))
unprojected := matrix.Unproject(pixel.V(0, 0))
assert.InDelta(t, unprojected.X, -5, delta)
assert.InDelta(t, unprojected.Y, -5, delta)
Moved(pixel.V(1, 2))
unprojected := matrix.Unproject(pixel.V(2, 5))
assert.InDelta(t, unprojected.X, 1, delta)
assert.InDelta(t, unprojected.Y, 3, delta)
})
t.Run("for scaled matrix", func(t *testing.T) {
matrix := pixel.IM.
Scaled(pixel.ZV, 2)
unprojected := matrix.Unproject(pixel.V(4, 4))
assert.InDelta(t, unprojected.X, 2, delta)
unprojected := matrix.Unproject(pixel.V(2, 4))
assert.InDelta(t, unprojected.X, 1, delta)
assert.InDelta(t, unprojected.Y, 2, delta)
})
t.Run("for scaled, rotated and moved matrix", func(t *testing.T) {
@ -120,6 +120,41 @@ func TestMatrix_Unproject(t *testing.T) {
assert.InDelta(t, unprojected.X, 1, delta)
assert.InDelta(t, unprojected.Y, 0, delta)
})
t.Run("for projected vertices using all kinds of matrices", func(t *testing.T) {
matrices := [...]pixel.Matrix{
pixel.IM,
pixel.IM.Scaled(pixel.ZV, 0.5),
pixel.IM.Scaled(pixel.ZV, 2),
pixel.IM.Rotated(pixel.ZV, math.Pi/4),
pixel.IM.Moved(pixel.V(0.5, 1)),
pixel.IM.Moved(pixel.V(-1, -0.5)),
pixel.IM.Scaled(pixel.ZV, 0.5).Rotated(pixel.ZV, math.Pi/4),
pixel.IM.Scaled(pixel.ZV, 0.5).Rotated(pixel.ZV, math.Pi/4).Moved(pixel.V(1, 2)),
pixel.IM.Rotated(pixel.ZV, math.Pi/4).Moved(pixel.V(1, 2)),
}
vertices := [...]pixel.Vec{
pixel.V(0, 0),
pixel.V(5, 0),
pixel.V(5, 10),
pixel.V(0, 10),
pixel.V(-5, 10),
pixel.V(-5, 0),
pixel.V(-5, -10),
pixel.V(0, -10),
pixel.V(5, -10),
}
for _, matrix := range matrices {
for _, vertex := range vertices {
testCase := fmt.Sprintf("for matrix %v and vertex %v", matrix, vertex)
t.Run(testCase, func(t *testing.T) {
projected := matrix.Project(vertex)
unprojected := matrix.Unproject(projected)
assert.InDelta(t, vertex.X, unprojected.X, delta)
assert.InDelta(t, vertex.Y, unprojected.Y, delta)
})
}
}
})
t.Run("for singular matrix", func(t *testing.T) {
matrix := pixel.Matrix{0, 0, 0, 0, 0, 0}
unprojected := matrix.Unproject(pixel.ZV)