ebiten/vector/util_test.go

// Copyright 2023 The Ebitengine Authors
//
// 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.

package vector_test

import (
	"image"
	"image/color"
	"testing"

	"github.com/hajimehoshi/ebiten/v2"
	t "github.com/hajimehoshi/ebiten/v2/internal/testing"
	"github.com/hajimehoshi/ebiten/v2/vector"
)

func TestMain(m *testing.M) {
	t.MainWithRunLoop(m)
}

// Issue #2589
func TestLine0(t *testing.T) {
	dst := ebiten.NewImage(16, 16)
	vector.StrokeLine(dst, 0, 0, 0, 0, 2, color.White, true)
	if got, want := dst.At(0, 0), (color.RGBA{}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
}

// Issue #3270
func TestStrokeRectAntiAlias(t *testing.T) {
	dst := ebiten.NewImage(16, 16)
	vector.StrokeRect(dst, 0, 0, 16, 16, 2, color.White, true)
	if got, want := dst.At(5, 5), (color.RGBA{}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
}

// Issue #3330
func TestFillRectSubImage(t *testing.T) {
	dst := ebiten.NewImage(16, 16)

	dst2 := dst.SubImage(image.Rect(0, 0, 8, 8)).(*ebiten.Image)
	vector.FillRect(dst2, 0, 0, 8, 8, color.White, true)
	if got, want := dst.At(5, 5), (color.RGBA{0xff, 0xff, 0xff, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
	if got, want := dst2.At(5, 5), (color.RGBA{0xff, 0xff, 0xff, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}

	dst3 := dst2.SubImage(image.Rect(4, 4, 8, 8)).(*ebiten.Image)
	vector.FillRect(dst3, 4, 4, 4, 4, color.Black, true)
	if got, want := dst.At(5, 5), (color.RGBA{0x00, 0x00, 0x00, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
	if got, want := dst2.At(5, 5), (color.RGBA{0x00, 0x00, 0x00, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
	if got, want := dst3.At(5, 5), (color.RGBA{0x00, 0x00, 0x00, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
}

// Issue #3330
func TestFillCircleSubImage(t *testing.T) {
	dst := ebiten.NewImage(16, 16)

	dst2 := dst.SubImage(image.Rect(0, 0, 8, 8)).(*ebiten.Image)
	vector.FillCircle(dst2, 4, 4, 4, color.White, true)
	if got, want := dst.At(5, 5), (color.RGBA{0xff, 0xff, 0xff, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
	if got, want := dst2.At(5, 5), (color.RGBA{0xff, 0xff, 0xff, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}

	dst3 := dst2.SubImage(image.Rect(4, 4, 8, 8)).(*ebiten.Image)
	vector.FillCircle(dst3, 6, 6, 4, color.Black, true)
	if got, want := dst.At(5, 5), (color.RGBA{0x00, 0x00, 0x00, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
	if got, want := dst2.At(5, 5), (color.RGBA{0x00, 0x00, 0x00, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
	if got, want := dst3.At(5, 5), (color.RGBA{0x00, 0x00, 0x00, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
}

// Issue #3330
func TestFillPathSubImage(t *testing.T) {
	dst := ebiten.NewImage(16, 16)

	dst2 := dst.SubImage(image.Rect(0, 0, 8, 8)).(*ebiten.Image)
	var p vector.Path
	p.MoveTo(0, 0)
	p.LineTo(8, 0)
	p.LineTo(8, 8)
	p.LineTo(0, 8)
	p.Close()
	op := &vector.DrawPathOptions{}
	op.ColorScale.ScaleWithColor(color.White)
	op.AntiAlias = true
	vector.FillPath(dst2, &p, nil, op)
	if got, want := dst.At(5, 5), (color.RGBA{0xff, 0xff, 0xff, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
	if got, want := dst2.At(5, 5), (color.RGBA{0xff, 0xff, 0xff, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}

	dst3 := dst2.SubImage(image.Rect(4, 4, 8, 8)).(*ebiten.Image)
	var p2 vector.Path
	p2.MoveTo(4, 4)
	p2.LineTo(8, 4)
	p2.LineTo(8, 8)
	p2.LineTo(4, 8)
	p2.Close()
	op.ColorScale.Reset()
	op.ColorScale.ScaleWithColor(color.Black)
	vector.FillPath(dst3, &p2, nil, op)
	if got, want := dst.At(5, 5), (color.RGBA{0x00, 0x00, 0x00, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
	if got, want := dst2.At(5, 5), (color.RGBA{0x00, 0x00, 0x00, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
	if got, want := dst3.At(5, 5), (color.RGBA{0x00, 0x00, 0x00, 0xff}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
}