vggio more tests#765

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Merged
sbinet merged 2 commits into from
Apr 28, 2023
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vggio more tests #765

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vg/vggio: add test of paths
sbinet Apr 28, 2023
2169b7b
vg/vggio: add test for DrawImage
sbinet Apr 28, 2023
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183 changes: 183 additions & 0 deletions vg/vggio/vggio_test.go
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Expand Up@@ -297,3 +297,186 @@ func TestLabels(t *testing.T) {
}, t, deltaGio, "labels.png",
)
}

func TestPaths(t *testing.T) {
if runtime.GOOS == "darwin" {
t.Skip("TODO: github actions for darwin with headless setup.")
}

const fname = "testdata/paths.png"

const (
w = 20 * vg.Centimeter
h = 15 * vg.Centimeter
dpi = 96
)

cmpimg.CheckPlotApprox(func() {
p := plot.New()
p.Title.Text = "Paths"
p.X.Min = -1
p.X.Max = +1
p.Y.Min = -1
p.Y.Max = +1

newScatter := func(c color.Color, sty draw.GlyphDrawer, x, y float64) *plotter.Scatter {
t.Helper()

pts := make(plotter.XYs, 1)
pts[0].X = x
pts[0].Y = y

plt, err := plotter.NewScatter(pts)
if err != nil {
t.Fatal(err)
}
plt.GlyphStyle.Color = c
plt.GlyphStyle.Radius = vg.Points(10)
plt.GlyphStyle.Shape = sty
return plt
}

p.Add(
newScatter(
color.RGBA{R: 255, A: 255},
draw.CircleGlyph{},
-0.8, -0.8,
),
newScatter(
color.RGBA{B: 255, A: 255},
draw.RingGlyph{},
-0.6, -0.6,
),
newScatter(
color.RGBA{R: 255, A: 255},
draw.SquareGlyph{},
-0.4, -0.4,
),
newScatter(
color.RGBA{B: 255, A: 255},
draw.BoxGlyph{},
-0.2, -0.2,
),
newScatter(
color.RGBA{R: 255, A: 255},
draw.TriangleGlyph{},
0, 0,
),
newScatter(
color.RGBA{B: 255, A: 255},
draw.PyramidGlyph{},
0.2, 0.2,
),
newScatter(
color.RGBA{R: 255, A: 255},
draw.PlusGlyph{},
0.4, 0.4,
),
newScatter(
color.RGBA{B: 255, A: 255},
draw.CrossGlyph{},
0.6, 0.6,
),
)

p.Add(plotter.NewGrid())
p.Add(plotter.NewGlyphBoxes())

gtx := layout.Context{
Ops: new(op.Ops),
Constraints: layout.Exact(image.Pt(
int(w.Dots(dpi)),
int(h.Dots(dpi)),
)),
}
cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
p.Draw(draw.New(cnv))

img, err := cnv.Screenshot()
if err != nil {
t.Fatalf("could not create screenshot: %+v", err)
}
f, err := os.Create(fname)
if err != nil {
t.Fatalf("could not create output file: %+v", err)
}
defer f.Close()

err = png.Encode(f, img)
if err != nil {
t.Fatalf("could not encode screenshot: %+v", err)
}

err = f.Close()
if err != nil {
t.Fatalf("could not save screenshot: %+v", err)
}
}, t, deltaGio, "paths.png",
)
}

// An example of embedding an image in a plot.
func TestImage(t *testing.T) {
if runtime.GOOS == "darwin" {
t.Skip("TODO: github actions for darwin with headless setup.")
}

const fname = "testdata/image.png"

const (
w = 20 * vg.Centimeter
h = 15 * vg.Centimeter
dpi = 96
)

cmpimg.CheckPlotApprox(func() {
p := plot.New()
p.Title.Text = "A Logo"

// load an image
src, err := os.Open("../../plotter/testdata/gopher.png")
if err != nil {
t.Fatalf("error opening image file: %v\n", err)
}
defer src.Close()

img, err := png.Decode(src)
if err != nil {
t.Fatalf("error decoding image file: %v\n", err)
}

p.Add(plotter.NewImage(img, 100, 100, 200, 200))

gtx := layout.Context{
Ops: new(op.Ops),
Constraints: layout.Exact(image.Pt(
int(w.Dots(dpi)),
int(h.Dots(dpi)),
)),
}
cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
p.Draw(draw.New(cnv))

scr, err := cnv.Screenshot()
if err != nil {
t.Fatalf("could not create screenshot: %+v", err)
}

out, err := os.Create(fname)
if err != nil {
t.Fatalf("could not create output file: %+v", err)
}
defer out.Close()

err = png.Encode(out, scr)
if err != nil {
t.Fatalf("could not encode screenshot: %+v", err)
}

err = out.Close()
if err != nil {
t.Fatalf("could not save screenshot: %+v", err)
}
}, t, deltaGio, "image.png",
)
}
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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vggio more tests#765

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 Merged

sbinet
merged 2 commits into

from

Apr 28, 2023
 Merged


vggio more tests
#765
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fb36537

vg/vggio: add test of paths


sbinet Apr 28, 2023
2169b7b

vg/vggio: add test for DrawImage


sbinet Apr 28, 2023

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183 changes: 183 additions & 0 deletions
vg/vggio/vggio_test.go

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Original file line numberDiff line numberDiff line change
Expand Up@@ -297,3 +297,186 @@ func TestLabels(t *testing.T) {
	}, t, deltaGio, "labels.png",
	)
}

func TestPaths(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/paths.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "Paths"
 p.X.Min = -1
 p.X.Max = +1
 p.Y.Min = -1
 p.Y.Max = +1

 newScatter := func(c color.Color, sty draw.GlyphDrawer, x, y float64) *plotter.Scatter {
 t.Helper()

 pts := make(plotter.XYs, 1)
 pts[0].X = x
 pts[0].Y = y

 plt, err := plotter.NewScatter(pts)
 if err != nil {
 t.Fatal(err)
 }
 plt.GlyphStyle.Color = c
 plt.GlyphStyle.Radius = vg.Points(10)
 plt.GlyphStyle.Shape = sty
 return plt
 }

 p.Add(
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.CircleGlyph{},
 -0.8, -0.8,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.RingGlyph{},
 -0.6, -0.6,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.SquareGlyph{},
 -0.4, -0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.BoxGlyph{},
 -0.2, -0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.TriangleGlyph{},
 0, 0,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.PyramidGlyph{},
 0.2, 0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.PlusGlyph{},
 0.4, 0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.CrossGlyph{},
 0.6, 0.6,
 ),
 )

 p.Add(plotter.NewGrid())
 p.Add(plotter.NewGlyphBoxes())

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 img, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }
 f, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer f.Close()

 err = png.Encode(f, img)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = f.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "paths.png",
	)
}

// An example of embedding an image in a plot.
func TestImage(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/image.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "A Logo"

 // load an image
 src, err := os.Open("../../plotter/testdata/gopher.png")
 if err != nil {
 t.Fatalf("error opening image file: %v\n", err)
 }
 defer src.Close()

 img, err := png.Decode(src)
 if err != nil {
 t.Fatalf("error decoding image file: %v\n", err)
 }

 p.Add(plotter.NewImage(img, 100, 100, 200, 200))

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 scr, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }

 out, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer out.Close()

 err = png.Encode(out, scr)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = out.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "image.png",
	)
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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vggio more tests#765

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 Merged

sbinet
merged 2 commits into

from

Apr 28, 2023
 Merged


vggio more tests
#765
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fb36537

vg/vggio: add test of paths


sbinet Apr 28, 2023
2169b7b

vg/vggio: add test for DrawImage


sbinet Apr 28, 2023

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183 changes: 183 additions & 0 deletions
vg/vggio/vggio_test.go

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Original file line numberDiff line numberDiff line change
Expand Up@@ -297,3 +297,186 @@ func TestLabels(t *testing.T) {
	}, t, deltaGio, "labels.png",
	)
}

func TestPaths(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/paths.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "Paths"
 p.X.Min = -1
 p.X.Max = +1
 p.Y.Min = -1
 p.Y.Max = +1

 newScatter := func(c color.Color, sty draw.GlyphDrawer, x, y float64) *plotter.Scatter {
 t.Helper()

 pts := make(plotter.XYs, 1)
 pts[0].X = x
 pts[0].Y = y

 plt, err := plotter.NewScatter(pts)
 if err != nil {
 t.Fatal(err)
 }
 plt.GlyphStyle.Color = c
 plt.GlyphStyle.Radius = vg.Points(10)
 plt.GlyphStyle.Shape = sty
 return plt
 }

 p.Add(
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.CircleGlyph{},
 -0.8, -0.8,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.RingGlyph{},
 -0.6, -0.6,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.SquareGlyph{},
 -0.4, -0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.BoxGlyph{},
 -0.2, -0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.TriangleGlyph{},
 0, 0,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.PyramidGlyph{},
 0.2, 0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.PlusGlyph{},
 0.4, 0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.CrossGlyph{},
 0.6, 0.6,
 ),
 )

 p.Add(plotter.NewGrid())
 p.Add(plotter.NewGlyphBoxes())

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 img, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }
 f, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer f.Close()

 err = png.Encode(f, img)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = f.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "paths.png",
	)
}

// An example of embedding an image in a plot.
func TestImage(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/image.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "A Logo"

 // load an image
 src, err := os.Open("../../plotter/testdata/gopher.png")
 if err != nil {
 t.Fatalf("error opening image file: %v\n", err)
 }
 defer src.Close()

 img, err := png.Decode(src)
 if err != nil {
 t.Fatalf("error decoding image file: %v\n", err)
 }

 p.Add(plotter.NewImage(img, 100, 100, 200, 200))

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 scr, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }

 out, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer out.Close()

 err = png.Encode(out, scr)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = out.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "image.png",
	)
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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vggio more tests#765

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 Merged

sbinet
merged 2 commits into

from

Apr 28, 2023
 Merged


vggio more tests
#765
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fb36537

vg/vggio: add test of paths


sbinet Apr 28, 2023
2169b7b

vg/vggio: add test for DrawImage


sbinet Apr 28, 2023

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183 changes: 183 additions & 0 deletions
vg/vggio/vggio_test.go

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Original file line numberDiff line numberDiff line change
Expand Up@@ -297,3 +297,186 @@ func TestLabels(t *testing.T) {
	}, t, deltaGio, "labels.png",
	)
}

func TestPaths(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/paths.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "Paths"
 p.X.Min = -1
 p.X.Max = +1
 p.Y.Min = -1
 p.Y.Max = +1

 newScatter := func(c color.Color, sty draw.GlyphDrawer, x, y float64) *plotter.Scatter {
 t.Helper()

 pts := make(plotter.XYs, 1)
 pts[0].X = x
 pts[0].Y = y

 plt, err := plotter.NewScatter(pts)
 if err != nil {
 t.Fatal(err)
 }
 plt.GlyphStyle.Color = c
 plt.GlyphStyle.Radius = vg.Points(10)
 plt.GlyphStyle.Shape = sty
 return plt
 }

 p.Add(
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.CircleGlyph{},
 -0.8, -0.8,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.RingGlyph{},
 -0.6, -0.6,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.SquareGlyph{},
 -0.4, -0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.BoxGlyph{},
 -0.2, -0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.TriangleGlyph{},
 0, 0,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.PyramidGlyph{},
 0.2, 0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.PlusGlyph{},
 0.4, 0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.CrossGlyph{},
 0.6, 0.6,
 ),
 )

 p.Add(plotter.NewGrid())
 p.Add(plotter.NewGlyphBoxes())

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 img, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }
 f, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer f.Close()

 err = png.Encode(f, img)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = f.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "paths.png",
	)
}

// An example of embedding an image in a plot.
func TestImage(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/image.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "A Logo"

 // load an image
 src, err := os.Open("../../plotter/testdata/gopher.png")
 if err != nil {
 t.Fatalf("error opening image file: %v\n", err)
 }
 defer src.Close()

 img, err := png.Decode(src)
 if err != nil {
 t.Fatalf("error decoding image file: %v\n", err)
 }

 p.Add(plotter.NewImage(img, 100, 100, 200, 200))

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 scr, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }

 out, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer out.Close()

 err = png.Encode(out, scr)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = out.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "image.png",
	)
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Apr 28, 2023
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vggio more tests
#765
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fb36537

vg/vggio: add test of paths


sbinet Apr 28, 2023
2169b7b

vg/vggio: add test for DrawImage


sbinet Apr 28, 2023

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183 changes: 183 additions & 0 deletions
vg/vggio/vggio_test.go

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Original file line numberDiff line numberDiff line change
Expand Up@@ -297,3 +297,186 @@ func TestLabels(t *testing.T) {
	}, t, deltaGio, "labels.png",
	)
}

func TestPaths(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/paths.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "Paths"
 p.X.Min = -1
 p.X.Max = +1
 p.Y.Min = -1
 p.Y.Max = +1

 newScatter := func(c color.Color, sty draw.GlyphDrawer, x, y float64) *plotter.Scatter {
 t.Helper()

 pts := make(plotter.XYs, 1)
 pts[0].X = x
 pts[0].Y = y

 plt, err := plotter.NewScatter(pts)
 if err != nil {
 t.Fatal(err)
 }
 plt.GlyphStyle.Color = c
 plt.GlyphStyle.Radius = vg.Points(10)
 plt.GlyphStyle.Shape = sty
 return plt
 }

 p.Add(
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.CircleGlyph{},
 -0.8, -0.8,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.RingGlyph{},
 -0.6, -0.6,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.SquareGlyph{},
 -0.4, -0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.BoxGlyph{},
 -0.2, -0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.TriangleGlyph{},
 0, 0,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.PyramidGlyph{},
 0.2, 0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.PlusGlyph{},
 0.4, 0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.CrossGlyph{},
 0.6, 0.6,
 ),
 )

 p.Add(plotter.NewGrid())
 p.Add(plotter.NewGlyphBoxes())

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 img, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }
 f, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer f.Close()

 err = png.Encode(f, img)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = f.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "paths.png",
	)
}

// An example of embedding an image in a plot.
func TestImage(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/image.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "A Logo"

 // load an image
 src, err := os.Open("../../plotter/testdata/gopher.png")
 if err != nil {
 t.Fatalf("error opening image file: %v\n", err)
 }
 defer src.Close()

 img, err := png.Decode(src)
 if err != nil {
 t.Fatalf("error decoding image file: %v\n", err)
 }

 p.Add(plotter.NewImage(img, 100, 100, 200, 200))

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 scr, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }

 out, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer out.Close()

 err = png.Encode(out, scr)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = out.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "image.png",
	)
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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 Merged

sbinet
merged 2 commits into

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Apr 28, 2023
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vggio more tests
#765
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fb36537

vg/vggio: add test of paths


sbinet Apr 28, 2023
2169b7b

vg/vggio: add test for DrawImage


sbinet Apr 28, 2023

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183 changes: 183 additions & 0 deletions
vg/vggio/vggio_test.go

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Original file line numberDiff line numberDiff line change
Expand Up@@ -297,3 +297,186 @@ func TestLabels(t *testing.T) {
	}, t, deltaGio, "labels.png",
	)
}

func TestPaths(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/paths.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "Paths"
 p.X.Min = -1
 p.X.Max = +1
 p.Y.Min = -1
 p.Y.Max = +1

 newScatter := func(c color.Color, sty draw.GlyphDrawer, x, y float64) *plotter.Scatter {
 t.Helper()

 pts := make(plotter.XYs, 1)
 pts[0].X = x
 pts[0].Y = y

 plt, err := plotter.NewScatter(pts)
 if err != nil {
 t.Fatal(err)
 }
 plt.GlyphStyle.Color = c
 plt.GlyphStyle.Radius = vg.Points(10)
 plt.GlyphStyle.Shape = sty
 return plt
 }

 p.Add(
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.CircleGlyph{},
 -0.8, -0.8,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.RingGlyph{},
 -0.6, -0.6,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.SquareGlyph{},
 -0.4, -0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.BoxGlyph{},
 -0.2, -0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.TriangleGlyph{},
 0, 0,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.PyramidGlyph{},
 0.2, 0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.PlusGlyph{},
 0.4, 0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.CrossGlyph{},
 0.6, 0.6,
 ),
 )

 p.Add(plotter.NewGrid())
 p.Add(plotter.NewGlyphBoxes())

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 img, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }
 f, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer f.Close()

 err = png.Encode(f, img)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = f.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "paths.png",
	)
}

// An example of embedding an image in a plot.
func TestImage(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/image.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "A Logo"

 // load an image
 src, err := os.Open("../../plotter/testdata/gopher.png")
 if err != nil {
 t.Fatalf("error opening image file: %v\n", err)
 }
 defer src.Close()

 img, err := png.Decode(src)
 if err != nil {
 t.Fatalf("error decoding image file: %v\n", err)
 }

 p.Add(plotter.NewImage(img, 100, 100, 200, 200))

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 scr, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }

 out, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer out.Close()

 err = png.Encode(out, scr)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = out.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "image.png",
	)
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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 Merged

sbinet
merged 2 commits into

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Apr 28, 2023
 Merged


vggio more tests
#765
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fb36537

vg/vggio: add test of paths


sbinet Apr 28, 2023
2169b7b

vg/vggio: add test for DrawImage


sbinet Apr 28, 2023

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183 changes: 183 additions & 0 deletions
vg/vggio/vggio_test.go

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Original file line numberDiff line numberDiff line change
Expand Up@@ -297,3 +297,186 @@ func TestLabels(t *testing.T) {
	}, t, deltaGio, "labels.png",
	)
}

func TestPaths(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/paths.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "Paths"
 p.X.Min = -1
 p.X.Max = +1
 p.Y.Min = -1
 p.Y.Max = +1

 newScatter := func(c color.Color, sty draw.GlyphDrawer, x, y float64) *plotter.Scatter {
 t.Helper()

 pts := make(plotter.XYs, 1)
 pts[0].X = x
 pts[0].Y = y

 plt, err := plotter.NewScatter(pts)
 if err != nil {
 t.Fatal(err)
 }
 plt.GlyphStyle.Color = c
 plt.GlyphStyle.Radius = vg.Points(10)
 plt.GlyphStyle.Shape = sty
 return plt
 }

 p.Add(
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.CircleGlyph{},
 -0.8, -0.8,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.RingGlyph{},
 -0.6, -0.6,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.SquareGlyph{},
 -0.4, -0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.BoxGlyph{},
 -0.2, -0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.TriangleGlyph{},
 0, 0,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.PyramidGlyph{},
 0.2, 0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.PlusGlyph{},
 0.4, 0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.CrossGlyph{},
 0.6, 0.6,
 ),
 )

 p.Add(plotter.NewGrid())
 p.Add(plotter.NewGlyphBoxes())

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 img, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }
 f, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer f.Close()

 err = png.Encode(f, img)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = f.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "paths.png",
	)
}

// An example of embedding an image in a plot.
func TestImage(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/image.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "A Logo"

 // load an image
 src, err := os.Open("../../plotter/testdata/gopher.png")
 if err != nil {
 t.Fatalf("error opening image file: %v\n", err)
 }
 defer src.Close()

 img, err := png.Decode(src)
 if err != nil {
 t.Fatalf("error decoding image file: %v\n", err)
 }

 p.Add(plotter.NewImage(img, 100, 100, 200, 200))

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 scr, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }

 out, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer out.Close()

 err = png.Encode(out, scr)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = out.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "image.png",
	)
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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 Merged

sbinet
merged 2 commits into

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Apr 28, 2023
 Merged


vggio more tests
#765
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fb36537

vg/vggio: add test of paths


sbinet Apr 28, 2023
2169b7b

vg/vggio: add test for DrawImage


sbinet Apr 28, 2023

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183 changes: 183 additions & 0 deletions
vg/vggio/vggio_test.go

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Original file line numberDiff line numberDiff line change
Expand Up@@ -297,3 +297,186 @@ func TestLabels(t *testing.T) {
	}, t, deltaGio, "labels.png",
	)
}

func TestPaths(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/paths.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "Paths"
 p.X.Min = -1
 p.X.Max = +1
 p.Y.Min = -1
 p.Y.Max = +1

 newScatter := func(c color.Color, sty draw.GlyphDrawer, x, y float64) *plotter.Scatter {
 t.Helper()

 pts := make(plotter.XYs, 1)
 pts[0].X = x
 pts[0].Y = y

 plt, err := plotter.NewScatter(pts)
 if err != nil {
 t.Fatal(err)
 }
 plt.GlyphStyle.Color = c
 plt.GlyphStyle.Radius = vg.Points(10)
 plt.GlyphStyle.Shape = sty
 return plt
 }

 p.Add(
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.CircleGlyph{},
 -0.8, -0.8,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.RingGlyph{},
 -0.6, -0.6,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.SquareGlyph{},
 -0.4, -0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.BoxGlyph{},
 -0.2, -0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.TriangleGlyph{},
 0, 0,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.PyramidGlyph{},
 0.2, 0.2,
 ),
 newScatter(
 color.RGBA{R: 255, A: 255},
 draw.PlusGlyph{},
 0.4, 0.4,
 ),
 newScatter(
 color.RGBA{B: 255, A: 255},
 draw.CrossGlyph{},
 0.6, 0.6,
 ),
 )

 p.Add(plotter.NewGrid())
 p.Add(plotter.NewGlyphBoxes())

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 img, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }
 f, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer f.Close()

 err = png.Encode(f, img)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = f.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "paths.png",
	)
}

// An example of embedding an image in a plot.
func TestImage(t *testing.T) {
	if runtime.GOOS == "darwin" {
 t.Skip("TODO: github actions for darwin with headless setup.")
	}

	const fname = "testdata/image.png"

	const (
 w = 20 * vg.Centimeter
 h = 15 * vg.Centimeter
 dpi = 96
	)

	cmpimg.CheckPlotApprox(func() {
 p := plot.New()
 p.Title.Text = "A Logo"

 // load an image
 src, err := os.Open("../../plotter/testdata/gopher.png")
 if err != nil {
 t.Fatalf("error opening image file: %v\n", err)
 }
 defer src.Close()

 img, err := png.Decode(src)
 if err != nil {
 t.Fatalf("error decoding image file: %v\n", err)
 }

 p.Add(plotter.NewImage(img, 100, 100, 200, 200))

 gtx := layout.Context{
 Ops: new(op.Ops),
 Constraints: layout.Exact(image.Pt(
 int(w.Dots(dpi)),
 int(h.Dots(dpi)),
 )),
 }
 cnv := New(gtx, w, h, UseDPI(dpi), UseBackgroundColor(color.Transparent))
 p.Draw(draw.New(cnv))

 scr, err := cnv.Screenshot()
 if err != nil {
 t.Fatalf("could not create screenshot: %+v", err)
 }

 out, err := os.Create(fname)
 if err != nil {
 t.Fatalf("could not create output file: %+v", err)
 }
 defer out.Close()

 err = png.Encode(out, scr)
 if err != nil {
 t.Fatalf("could not encode screenshot: %+v", err)
 }

 err = out.Close()
 if err != nil {
 t.Fatalf("could not save screenshot: %+v", err)
 }
	}, t, deltaGio, "image.png",
	)
}