ebiten/graphics/matrix/geometry_test.go

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package matrix_test
import (
. "."
"testing"
)
func TestGeometryIdentity(t *testing.T) {
matrix := IdentityGeometry()
got := matrix.IsIdentity()
want := true
if want != got {
t.Errorf("matrix.IsIdentity() = %t, want %t", got, want)
}
}
func TestGeometryConcat(t *testing.T) {
matrix1 := Geometry{}
matrix2 := Geometry{}
matrix1.Elements = [2][3]float64{
{2, 0, 0},
{0, 2, 0},
}
matrix2.Elements = [2][3]float64{
{1, 0, 1},
{0, 1, 1},
}
// TODO: 'matrix1x2' may not be a good name.
matrix1x2 := matrix1
matrix1x2.Concat(matrix2)
expected := [][]float64{
{2, 0, 1},
{0, 2, 1},
}
for i := 0; i < 2; i++ {
for j := 0; j < 3; j++ {
got := matrix1x2.Elements[i][j]
want := expected[i][j]
if want != got {
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t.Errorf("matrix1x2.Element(%d, %d) = %f,"+
" want %f",
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i, j, got, want)
}
}
}
matrix2x1 := matrix2
matrix2x1.Concat(matrix1)
expected = [][]float64{
{2, 0, 2},
{0, 2, 2},
}
for i := 0; i < 2; i++ {
for j := 0; j < 3; j++ {
got := matrix2x1.Elements[i][j]
want := expected[i][j]
if want != got {
t.Errorf("matrix2x1.Element(%d, %d) = %f, want %f",
i, j, got, want)
}
}
}
}