ebiten/geometrymatrix_test.go

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// Copyright 2014 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package ebiten_test
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import (
. "."
"testing"
)
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func TestGeometryInit(t *testing.T) {
var m GeometryMatrix
for i := 0; i < GeometryMatrixDim-1; i++ {
for j := 0; j < GeometryMatrixDim; j++ {
got := m.Element(i, j)
want := 0.0
if i == j {
want = 1
}
if want != got {
t.Errorf("m.Element(%d, %d) = %f, want %f", i, j, got, want)
}
}
}
m.Add(m)
for i := 0; i < GeometryMatrixDim-1; i++ {
for j := 0; j < GeometryMatrixDim; j++ {
got := m.Element(i, j)
want := 0.0
if i == j {
want = 2
}
if want != got {
t.Errorf("m.Element(%d, %d) = %f, want %f", i, j, got, want)
}
}
}
}
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func TestGeometryConcat(t *testing.T) {
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matrix1 := ScaleGeometry(2, 2)
matrix2 := TranslateGeometry(1, 1)
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matrix3 := matrix1
matrix3.Concat(matrix2)
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expected := [][]float64{
{2, 0, 1},
{0, 2, 1},
}
for i := 0; i < 2; i++ {
for j := 0; j < 3; j++ {
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got := matrix3.Element(i, j)
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want := expected[i][j]
if want != got {
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t.Errorf("matrix3.Element(%d, %d) = %f,"+
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" want %f",
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i, j, got, want)
}
}
}
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matrix4 := matrix2
matrix4.Concat(matrix1)
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expected = [][]float64{
{2, 0, 2},
{0, 2, 2},
}
for i := 0; i < 2; i++ {
for j := 0; j < 3; j++ {
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got := matrix4.Element(i, j)
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want := expected[i][j]
if want != got {
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t.Errorf("matrix4.Element(%d, %d) = %f, want %f",
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i, j, got, want)
}
}
}
}