From b2d255c6f2afffc425e91d8fed97cb1c1d185726 Mon Sep 17 00:00:00 2001 From: Michael Fogleman Date: Thu, 16 Aug 2018 22:08:53 -0400 Subject: [PATCH] Add some tests! (mostly regression tests) --- context_test.go | 294 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 294 insertions(+) create mode 100644 context_test.go diff --git a/context_test.go b/context_test.go new file mode 100644 index 0000000..d895f18 --- /dev/null +++ b/context_test.go @@ -0,0 +1,294 @@ +package gg + +import ( + "crypto/md5" + "fmt" + "image/color" + "math/rand" + "testing" +) + +func hash(dc *Context) string { + return fmt.Sprintf("%x", md5.Sum(dc.im.Pix)) +} + +func checkHash(t *testing.T, dc *Context, expected string) { + actual := hash(dc) + if actual != expected { + t.Fatalf("expected hash: %s != actual hash: %s", expected, actual) + } +} + +func saveImage(dc *Context, name string) error { + return SavePNG(name+".png", dc.Image()) +} + +func TestBlank(t *testing.T) { + dc := NewContext(100, 100) + saveImage(dc, "TestBlank") + checkHash(t, dc, "4e0a293a5b638f0aba2c4fe2c3418d0e") +} + +func TestGrid(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(1, 1, 1) + dc.Clear() + for i := 10; i < 100; i += 10 { + x := float64(i) + 0.5 + dc.DrawLine(x, 0, x, 100) + dc.DrawLine(0, x, 100, x) + } + dc.SetRGB(0, 0, 0) + dc.Stroke() + saveImage(dc, "TestGrid") + checkHash(t, dc, "78606adda71d8abfbd8bb271087e4d69") +} + +func TestLines(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(0.5, 0.5, 0.5) + dc.Clear() + rnd := rand.New(rand.NewSource(99)) + for i := 0; i < 100; i++ { + x1 := rnd.Float64() * 100 + y1 := rnd.Float64() * 100 + x2 := rnd.Float64() * 100 + y2 := rnd.Float64() * 100 + dc.DrawLine(x1, y1, x2, y2) + dc.SetLineWidth(rnd.Float64() * 3) + dc.SetRGB(rnd.Float64(), rnd.Float64(), rnd.Float64()) + dc.Stroke() + } + saveImage(dc, "TestLines") + checkHash(t, dc, "036bd220e2529955cc48425dd72bb686") +} + +func TestCircles(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(1, 1, 1) + dc.Clear() + rnd := rand.New(rand.NewSource(99)) + for i := 0; i < 10; i++ { + x := rnd.Float64() * 100 + y := rnd.Float64() * 100 + r := rnd.Float64()*10 + 5 + dc.DrawCircle(x, y, r) + dc.SetRGB(rnd.Float64(), rnd.Float64(), rnd.Float64()) + dc.FillPreserve() + dc.SetRGB(rnd.Float64(), rnd.Float64(), rnd.Float64()) + dc.SetLineWidth(rnd.Float64() * 3) + dc.Stroke() + } + saveImage(dc, "TestCircles") + checkHash(t, dc, "c52698000df96fabafe7863701afe922") +} + +func TestQuadratic(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(0.25, 0.25, 0.25) + dc.Clear() + rnd := rand.New(rand.NewSource(99)) + for i := 0; i < 100; i++ { + x1 := rnd.Float64() * 100 + y1 := rnd.Float64() * 100 + x2 := rnd.Float64() * 100 + y2 := rnd.Float64() * 100 + x3 := rnd.Float64() * 100 + y3 := rnd.Float64() * 100 + dc.MoveTo(x1, y1) + dc.QuadraticTo(x2, y2, x3, y3) + dc.SetLineWidth(rnd.Float64() * 3) + dc.SetRGB(rnd.Float64(), rnd.Float64(), rnd.Float64()) + dc.Stroke() + } + saveImage(dc, "TestQuadratic") + checkHash(t, dc, "56b842d814aee94b52495addae764a77") +} + +func TestCubic(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(0.75, 0.75, 0.75) + dc.Clear() + rnd := rand.New(rand.NewSource(99)) + for i := 0; i < 100; i++ { + x1 := rnd.Float64() * 100 + y1 := rnd.Float64() * 100 + x2 := rnd.Float64() * 100 + y2 := rnd.Float64() * 100 + x3 := rnd.Float64() * 100 + y3 := rnd.Float64() * 100 + x4 := rnd.Float64() * 100 + y4 := rnd.Float64() * 100 + dc.MoveTo(x1, y1) + dc.CubicTo(x2, y2, x3, y3, x4, y4) + dc.SetLineWidth(rnd.Float64() * 3) + dc.SetRGB(rnd.Float64(), rnd.Float64(), rnd.Float64()) + dc.Stroke() + } + saveImage(dc, "TestCubic") + checkHash(t, dc, "4a7960fc4eaaa33ce74131c5ce0afca8") +} + +func TestFill(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(1, 1, 1) + dc.Clear() + rnd := rand.New(rand.NewSource(99)) + for i := 0; i < 10; i++ { + dc.NewSubPath() + for j := 0; j < 10; j++ { + x := rnd.Float64() * 100 + y := rnd.Float64() * 100 + dc.LineTo(x, y) + } + dc.ClosePath() + dc.SetRGBA(rnd.Float64(), rnd.Float64(), rnd.Float64(), rnd.Float64()) + dc.Fill() + } + saveImage(dc, "TestFill") + checkHash(t, dc, "7ccb3a2443906a825e57ab94db785467") +} + +func TestClip(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(1, 1, 1) + dc.Clear() + dc.DrawCircle(50, 50, 40) + dc.Clip() + rnd := rand.New(rand.NewSource(99)) + for i := 0; i < 1000; i++ { + x := rnd.Float64() * 100 + y := rnd.Float64() * 100 + r := rnd.Float64()*10 + 5 + dc.DrawCircle(x, y, r) + dc.SetRGBA(rnd.Float64(), rnd.Float64(), rnd.Float64(), rnd.Float64()) + dc.Fill() + } + saveImage(dc, "TestClip") + checkHash(t, dc, "762c32374d529fd45ffa038b05be7865") +} + +func TestPushPop(t *testing.T) { + const S = 100 + dc := NewContext(S, S) + dc.SetRGBA(0, 0, 0, 0.1) + for i := 0; i < 360; i += 15 { + dc.Push() + dc.RotateAbout(Radians(float64(i)), S/2, S/2) + dc.DrawEllipse(S/2, S/2, S*7/16, S/8) + dc.Fill() + dc.Pop() + } + saveImage(dc, "TestPushPop") + checkHash(t, dc, "e0d6724eb72033577811a55f7a642f6a") +} + +func TestDrawStringWrapped(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(1, 1, 1) + dc.Clear() + dc.SetRGB(0, 0, 0) + dc.DrawStringWrapped("Hello, world! How are you?", 50, 50, 0.5, 0.5, 90, 1.5, AlignCenter) + saveImage(dc, "TestDrawStringWrapped") + checkHash(t, dc, "8d92f6aae9e8b38563f171abd00893f8") +} + +func TestDrawImage(t *testing.T) { + src := NewContext(100, 100) + src.SetRGB(1, 1, 1) + src.Clear() + for i := 10; i < 100; i += 10 { + x := float64(i) + 0.5 + src.DrawLine(x, 0, x, 100) + src.DrawLine(0, x, 100, x) + } + src.SetRGB(0, 0, 0) + src.Stroke() + + dc := NewContext(200, 200) + dc.SetRGB(0, 0, 0) + dc.Clear() + dc.DrawImage(src.Image(), 50, 50) + saveImage(dc, "TestDrawImage") + checkHash(t, dc, "282afbc134676722960b6bec21305b15") +} + +func TestSetPixel(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(0, 0, 0) + dc.Clear() + dc.SetRGB(0, 1, 0) + i := 0 + for y := 0; y < 100; y++ { + for x := 0; x < 100; x++ { + if i%31 == 0 { + dc.SetPixel(x, y) + } + i++ + } + } + saveImage(dc, "TestSetPixel") + checkHash(t, dc, "27dda6b4b1d94f061018825b11982793") +} + +func TestDrawPoint(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(0, 0, 0) + dc.Clear() + dc.SetRGB(0, 1, 0) + dc.Scale(10, 10) + for y := 0; y <= 10; y++ { + for x := 0; x <= 10; x++ { + dc.DrawPoint(float64(x), float64(y), 3) + dc.Fill() + } + } + saveImage(dc, "TestDrawPoint") + checkHash(t, dc, "55af8874531947ea6eeb62222fb33e0e") +} + +func TestLinearGradient(t *testing.T) { + dc := NewContext(100, 100) + g := NewLinearGradient(0, 0, 100, 100) + g.AddColorStop(0, color.RGBA{0, 255, 0, 255}) + g.AddColorStop(1, color.RGBA{0, 0, 255, 255}) + g.AddColorStop(0.5, color.RGBA{255, 0, 0, 255}) + dc.SetFillStyle(g) + dc.DrawRectangle(0, 0, 100, 100) + dc.Fill() + saveImage(dc, "TestLinearGradient") + checkHash(t, dc, "75eb9385c1219b1d5bb6f4c961802c7a") +} + +func TestRadialGradient(t *testing.T) { + dc := NewContext(100, 100) + g := NewRadialGradient(30, 50, 0, 70, 50, 50) + g.AddColorStop(0, color.RGBA{0, 255, 0, 255}) + g.AddColorStop(1, color.RGBA{0, 0, 255, 255}) + g.AddColorStop(0.5, color.RGBA{255, 0, 0, 255}) + dc.SetFillStyle(g) + dc.DrawRectangle(0, 0, 100, 100) + dc.Fill() + saveImage(dc, "TestRadialGradient") + checkHash(t, dc, "f170f39c3f35c29de11e00428532489d") +} + +func TestDashes(t *testing.T) { + dc := NewContext(100, 100) + dc.SetRGB(1, 1, 1) + dc.Clear() + rnd := rand.New(rand.NewSource(99)) + for i := 0; i < 100; i++ { + x1 := rnd.Float64() * 100 + y1 := rnd.Float64() * 100 + x2 := rnd.Float64() * 100 + y2 := rnd.Float64() * 100 + dc.SetDash(rnd.Float64()*3+1, rnd.Float64()*3+3) + dc.DrawLine(x1, y1, x2, y2) + dc.SetLineWidth(rnd.Float64() * 3) + dc.SetRGB(rnd.Float64(), rnd.Float64(), rnd.Float64()) + dc.Stroke() + } + saveImage(dc, "TestDashes") + checkHash(t, dc, "d188069c69dcc3970edfac80f552b53c") +}