How to use CanvasToImage method of rod Package

Best Rod code snippet using rod.CanvasToImage

element_test.go

Source:element_test.go

...487	t.Err(el.WaitStableRAF())488	t.mc.stubErr(1, proto.DOMGetContentQuads{})489	t.Err(el.WaitStableRAF())490}491func (t T) CanvasToImage() {492	p := t.page.MustNavigate(t.srcFile("fixtures/canvas.html"))493	src, err := png.Decode(bytes.NewBuffer(p.MustElement("#canvas").MustCanvasToImage()))494	t.E(err)495	t.Eq(src.At(50, 50), color.NRGBA{0xFF, 0x00, 0x00, 0xFF})496}497func (t T) ElementWaitLoad() {498	p := t.page.MustNavigate(t.srcFile("fixtures/resource.html"))499	p.MustElement("img").MustWaitLoad()500}501func (t T) Resource() {502	p := t.page.MustNavigate(t.srcFile("fixtures/resource.html"))503	el := p.MustElement("img")504	t.Eq(len(el.MustResource()), 22661)505	t.mc.stub(1, proto.PageGetResourceContent{}, func(send StubSend) (gson.JSON, error) {506		return gson.New(proto.PageGetResourceContentResult{507			Content:       "ok",508			Base64Encoded: false,509		}), nil510	})511	t.Eq([]byte("ok"), el.MustResource())512	t.Panic(func() {513		t.mc.stubErr(1, proto.RuntimeCallFunctionOn{})514		el.MustResource()515	})516	t.Panic(func() {517		t.mc.stubErr(1, proto.PageGetResourceContent{})518		el.MustResource()519	})520}521func (t T) BackgroundImage() {522	p := t.page.MustNavigate(t.srcFile("fixtures/resource.html"))523	el := p.MustElement("div")524	t.Eq(len(el.MustBackgroundImage()), 22661)525	{526		t.mc.stubErr(1, proto.RuntimeCallFunctionOn{})527		t.Err(el.BackgroundImage())528	}529}530func (t T) ElementScreenshot() {531	f := filepath.Join("tmp", "screenshots", t.Srand(16)+".png")532	p := t.page.MustNavigate(t.srcFile("fixtures/click.html"))533	el := p.MustElement("h4")534	data := el.MustScreenshot(f)535	img, err := png.Decode(bytes.NewBuffer(data))536	t.E(err)537	t.Eq(200, img.Bounds().Dx())538	t.Eq(30, img.Bounds().Dy())539	t.Nil(os.Stat(f))540	t.Panic(func() {541		t.mc.stubErr(1, proto.DOMScrollIntoViewIfNeeded{})542		el.MustScreenshot()543	})544	t.Panic(func() {545		t.mc.stubErr(1, proto.PageCaptureScreenshot{})546		el.MustScreenshot()547	})548	t.Panic(func() {549		t.mc.stubErr(3, proto.DOMGetContentQuads{})550		el.MustScreenshot()551	})552}553func (t T) UseReleasedElement() {554	p := t.page.MustNavigate(t.srcFile("fixtures/click.html"))555	btn := p.MustElement("button")556	btn.MustRelease()557	t.Err(btn.Click("left"))558	btn = p.MustElement("button")559	t.E(proto.RuntimeReleaseObject{ObjectID: btn.Object.ObjectID}.Call(p))560	t.Is(btn.Click("left"), cdp.ErrObjNotFound)561}562func (t T) ElementRemove() {563	p := t.page.MustNavigate(t.srcFile("fixtures/click.html"))564	btn := p.MustElement("button")565	t.mc.stubErr(1, proto.RuntimeCallFunctionOn{})566	t.Err(btn.Remove())567}568func (t T) ElementMultipleTimes() {569	// To see whether chrome will reuse the remote object ID or not.570	// Seems like it will not.571	page := t.page.MustNavigate(t.srcFile("fixtures/click.html"))572	btn01 := page.MustElement("button")573	btn02 := page.MustElement("button")574	t.Eq(btn01.MustText(), btn02.MustText())575	t.Neq(btn01.Object, btn02.Object)576}577func (t T) FnErr() {578	p := t.page.MustNavigate(t.srcFile("fixtures/click.html"))579	el := p.MustElement("button")580	_, err := el.Eval("foo()")581	t.Err(err)582	t.Has(err.Error(), "ReferenceError: foo is not defined")583	var e *rod.ErrEval584	t.True(errors.As(err, &e))585	t.Eq(proto.RuntimeRemoteObjectSubtypeError, e.Exception.Subtype)586	_, err = el.ElementByJS(rod.Eval("foo()"))587	t.Err(err)588	t.Has(err.Error(), "ReferenceError: foo is not defined")589	t.True(errors.Is(err, &rod.ErrEval{}))590}591func (t T) ElementEWithDepth() {592	checkStr := `green tea`593	p := t.page.MustNavigate(t.srcFile("fixtures/describe.html"))594	ulDOMNode, err := p.MustElement(`ul`).Describe(-1, true)595	t.Nil(errors.Unwrap(err))596	data, err := json.Marshal(ulDOMNode)597	t.Nil(errors.Unwrap(err))598	// The depth is -1, should contain checkStr599	t.Has(string(data), checkStr)600}601func (t T) ElementOthers() {602	p := t.page.MustNavigate(t.srcFile("fixtures/input.html"))603	el := p.MustElement("form")604	el.MustFocus()605	el.MustScrollIntoView()606	t.Eq("submit", el.MustElement("[type=submit]").MustText())607	t.Eq("<input type=\"submit\" value=\"submit\">", el.MustElement("[type=submit]").MustHTML())608	el.MustWait(`true`)609	t.Eq("form", el.MustElementByJS(`this`).MustDescribe().LocalName)610	t.Len(el.MustElementsByJS(`[]`), 0)611}612func (t T) ElementEqual() {613	p := t.page.MustNavigate(t.srcFile("fixtures/describe.html"))614	el1 := p.MustElement("body > ul")615	el2 := p.MustElement("html > body > ul")616	t.True(el1.MustEqual(el2))617	el3 := p.MustElement("ul ul")618	t.False(el1.MustEqual(el3))619}620func (t T) ElementFromPointErr() {621	t.mc.stubErr(1, proto.DOMGetNodeForLocation{})622	t.Err(t.page.ElementFromPoint(10, 10))623}624func (t T) ElementFromNodeErr() {625	p := t.page.MustNavigate(t.srcFile("fixtures/click.html"))626	el := p.MustElementX("//button/text()")627	t.mc.stubErr(3, proto.RuntimeCallFunctionOn{})628	t.Err(p.ElementFromNode(el.MustDescribe()))629}630func (t T) ElementErrors() {631	p := t.page.MustNavigate(t.srcFile("fixtures/input.html"))632	el := p.MustElement("form")633	ctx := t.Timeout(0)634	_, err := el.Context(ctx).Describe(-1, true)635	t.Err(err)636	_, err = el.Context(ctx).Frame()637	t.Err(err)638	err = el.Context(ctx).Focus()639	t.Err(err)640	err = el.Context(ctx).Press('a')641	t.Err(err)642	err = el.Context(ctx).Input("a")643	t.Err(err)644	err = el.Context(ctx).Select([]string{"a"}, true, rod.SelectorTypeText)645	t.Err(err)646	err = el.Context(ctx).WaitStable(0)647	t.Err(err)648	_, err = el.Context(ctx).Resource()649	t.Err(err)650	err = el.Context(ctx).Input("a")651	t.Err(err)652	err = el.Context(ctx).Input("a")653	t.Err(err)654	_, err = el.Context(ctx).HTML()655	t.Err(err)656	_, err = el.Context(ctx).Visible()657	t.Err(err)658	_, err = el.Context(ctx).CanvasToImage("", 0)659	t.Err(err)660	err = el.Context(ctx).Release()661	t.Err(err)662}...

element.go

Source:element.go

...502func (el *Element) WaitInvisible() error {503	defer el.tryTrace(TraceTypeWait, "invisible")()504	return el.Wait(evalHelper(js.Invisible))505}506// CanvasToImage get image data of a canvas.507// The default format is image/png.508// The default quality is 0.92.509// doc: https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toDataURL510func (el *Element) CanvasToImage(format string, quality float64) ([]byte, error) {511	res, err := el.Eval(`(format, quality) => this.toDataURL(format, quality)`, format, quality)512	if err != nil {513		return nil, err514	}515	_, bin := parseDataURI(res.Value.Str())516	return bin, nil517}518// Resource returns the "src" content of current element. Such as the jpg of <img src="a.jpg">519func (el *Element) Resource() ([]byte, error) {520	src, err := el.Evaluate(evalHelper(js.Resource).ByPromise())521	if err != nil {522		return nil, err523	}524	return el.page.GetResource(src.Value.String())...

capcha.go

Source:capcha.go

...83		if err != nil {84			handleError(err)85			return86		}87		img, err := el.CanvasToImage("image/png", 100)88		if err != nil {89			handleError(err)90			return91		}92		newImg, _, err := image.Decode(bytes.NewReader(img))93		if err != nil {94			log.Println("image.Decode", err)95			continue96		}97		out, err := os.Create(key + ".png")98		if err != nil {99			log.Println("os.Create", err)100			continue101		}...

CanvasToImage

Using AI Code Generation

1import (2func main() {3    browser := rod.New().ControlURL(launcher.New().MustLaunch()).MustConnect()4    defer browser.MustClose()5    page.MustWaitLoad()6    viewport := page.MustViewport()7    contentSize := page.MustContentSize()8    img := image.NewRGBA(image.Rect(0, 0, contentSize.Width, contentSize.Height))9    page.MustCanvasToImage(img, proto.PageViewport{10    })11    kit.E(utils.WriteFileMkdir("page.png", img, 0644))12}13import (14func main() {15    browser := rod.New().ControlURL(launcher.New().MustLaunch()).MustConnect()16    defer browser.MustClose()

CanvasToImage

Using AI Code Generation

1import (2var (3    browser = rod.New().MustConnect()4func main() {5    defer browser.MustClose()6    defer trace.Start().Stop()7    page.MustEnableNetworkLog()8    page.MustEnablePageLog()9    page.MustEnablePerformanceLog()10    page.MustEnableConsoleLog()11    page.MustEnableRuntimeLog()12    page.MustEnableSecurityLog()

CanvasToImage

Using AI Code Generation

1import (2func main() {3	browserURL := launcher.NewUserMode().MustLaunch()4	data, err := page.CanvasToImage(&proto.PageCaptureScreenshot{})5	if err != nil {6		panic(err)7	}8	err = data.WriteFile("screenshot.png

CanvasToImage

Using AI Code Generation

1import (2func main() {3	browser := rod.New().Connect()4	page := browser.Page("")5	page.WaitLoad()6	screenshot := page.Screenshot("", nil)7	file, err := os.Create("google.png")8	if err != nil {9		log.Fatal(err)10	}11	defer file.Close()12	png.Encode(file, screenshot)13	browser.Close()14}15import (16func main() {17	browser := rod.New().Connect()18	page := browser.Page("")19	page.WaitLoad()20	screenshot := page.Screenshot("", nil)21	file, err := os.Create("google.png")22	if err != nil {23		log.Fatal(err)24	}25	defer file.Close()26	png.Encode(file, screenshot)27	browser.Close()28}29import (30func main() {31	browser := rod.New().Connect()32	page := browser.Page("")33	page.WaitLoad()

CanvasToImage

Using AI Code Generation

1import (2func main() {3        Set("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.164 Safari/537.36")4    defer l.Cleanup()5    u := l.MustLaunch()6    browser := rod.New().ControlURL(u).MustConnect()7    page.MustWaitLoad()8    page.MustWaitLoad()9    el := page.MustElement("input[name='q']")10    el.MustInput("hello world")11    page.MustWaitLoad()12    img := page.MustCanvasToImage()13    file, err := os.Create("image.png")14    if err != nil {15        log.Fatal(err)16    }17    defer file.Close()18    err = img.Encode(file, "png")19    if err != nil {20        log.Fatal(err)21    }22}

CanvasToImage

Using AI Code Generation

1import (2func main() {3	browser := rod.New().Connect()4	defer browser.Close()5	defer page.Close()6	page.WaitLoad()7	viewport, err := page.Viewport()8	if err != nil {9		panic(err)10	}11	body, err := page.Element("body")12	if err != nil {13		panic(err)14	}15	boundingBox, err := body.BoundingBox()16	if err != nil {17		panic(err)18	}19	screenshot, err := body.Screenshot(proto.PageCaptureScreenshotFormatPng, proto.PageCaptureScreenshotQuality100, boundingBox)20	if err != nil {21		panic(err)22	}23	screenshotBase64, err := body.ScreenshotBase64(proto.PageCaptureScreenshotFormatPng, proto.PageCaptureScreenshotQuality100, boundingBox)24	if err != nil {25		panic(err)26	}27	screenshotImage, err := body.ScreenshotImage(proto.PageCaptureScreenshotFormatPng, proto.PageCaptureScreenshotQuality100, boundingBox)28	if err != nil {29		panic(err)30	}31	canvas, err := body.CanvasToImage(proto.PageCaptureScreenshotFormatPng, proto.PageCaptureScreenshotQuality100, boundingBox)32	if err != nil {33		panic(err)34	}35	fmt.Println("Viewport:", viewport)36	fmt.Println("Body bounding box:", boundingBox)37	fmt.Println("Body screenshot:", screenshot)38	fmt.Println("Body screenshot base64:", screenshotBase64)39	fmt.Println("Body screenshot image:", screenshotImage)40	fmt.Println("Body screenshot image:", canvas)41}42import (43func main() {44	browser := rod.New().Connect()45	defer browser.Close()

CanvasToImage

Using AI Code Generation

1import (2func main() {3    browser := rod.New().MustConnect()4    b64 := page.MustScreenshot("", proto.PageCaptureScreenshotFormatPng, 100)5    img, err := rod.FromBase64(b64).CanvasToImage()6    if err != nil {7        panic(err)8    }9    err = img.Save("screenshot.png")10    if err != nil {11        panic(err)12    }13}14import (15func main() {16    browser := rod.New().MustConnect()17    b64 := page.MustScreenshot("", proto.PageCaptureScreenshotFormatPng, 100)18    img, err := rod.FromBase64(b64).CanvasToImage()19    if err != nil {20        panic(err)21    }22    err = img.Save("screenshot.png")23    if err != nil {24        panic(err)25    }26}27import (

CanvasToImage

Using AI Code Generation

1func main() {2    page := r.MustPage("")3    page.MustScreenshot("screenshot.png")4    c := r.MustCanvas("")5    c.MustCanvasToImage("screenshot.png")6    c.MustSave("canvas.png")7    page.MustClose()8    r.MustClose()9}10func main() {11    page := r.MustPage("")12    page.MustScreenshot("screenshot.png")13    c := r.MustCanvas("")14    c.MustCanvasToImage("screenshot.png")15    c.MustSaveJPEG("canvas.jpg")16    page.MustClose()17    r.MustClose()18}19func main() {20    page := r.MustPage("")21    page.MustScreenshot("screenshot.png")22    c := r.MustCanvas("")23    c.MustCanvasToImage("screenshot.png")24    c.MustSaveGIF("canvas.gif")

CanvasToImage

Using AI Code Generation

1import "fmt"2func main() {3rod := new(Rod)4rod.Paint()5rod.CanvasToImage()6fmt.Println("Canvas to Image method of Rod class")7}8import "fmt"9func main() {10rod := new(Rod)11rod.Paint()12rod.CanvasToImage()13fmt.Println("Canvas to Image method of Rod class")14}

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