/
context_test.go
323 lines (299 loc) · 7.56 KB
/
context_test.go
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package gg
import (
"crypto/md5"
"flag"
"fmt"
"image/color"
"math/rand"
"testing"
)
var save bool
func init() {
flag.BoolVar(&save, "save", false, "save PNG output for each test case")
flag.Parse()
}
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 {
if save {
return SavePNG(name+".png", dc.Image())
}
return nil
}
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, "31e908ee1c2ea180da98fd5681a89d05")
}
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")
}
func BenchmarkCircles(b *testing.B) {
dc := NewContext(1000, 1000)
dc.SetRGB(1, 1, 1)
dc.Clear()
rnd := rand.New(rand.NewSource(99))
for i := 0; i < b.N; i++ {
x := rnd.Float64() * 1000
y := rnd.Float64() * 1000
dc.DrawCircle(x, y, 10)
if i%2 == 0 {
dc.SetRGB(0, 0, 0)
} else {
dc.SetRGB(1, 1, 1)
}
dc.Fill()
}
}