9 examples of 'get image from canvas' in JavaScript

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50function getImageAsCanvas(image) {
51 var
52 result = document.createElement("canvas"),
53 context = result.getContext("2d");
54
55 result.width = image.width;
56 result.height = image.height;
57
58 context.putImageData(image.imageData, 0, 0);
59
60 return result;
61}
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1function get_image_data (canvas) {
2 return canvas.context().getImageData(0, 0, canvas.width, canvas.height) ;
3
4}
49export function imageToCanvas(image) {
50 var canvas = document.createElement("canvas");
51 canvas.width = image.width;
52 canvas.height = image.height;
53 canvas.getContext("2d").drawImage(image, 0, 0);
54 return canvas;
55}
176function drawImgToCanvas(img, id) {
177 let canvas = document.getElementById(id);
178 let ctx = canvas.getContext('2d');
179
180 canvas.width = img.width;
181 canvas.height = img.height;
182
183 ctx.drawImage(img, 0, 0);
184}
131export function drawImageOnCanvas(image, canvas) {
132 canvas.getContext('2d').drawImage(image, 0, 0);
133
134 return canvas;
135}
179function sendImagefromCanvas() {
180
181 //Make sure the canvas is set to the current video size
182 imageCanvas.width = v.videoWidth;
183 imageCanvas.height = v.videoHeight;
184
185 imageCtx.drawImage(v, 0, 0, v.videoWidth, v.videoHeight);
186
187 //Convert the canvas to blob and post the file
188 imageCanvas.toBlob(postFile, 'image/jpeg');
189}
110function drawImage(img, canvas) {
111 const ctx = canvas.getContext('2d');
112
113 canvas.width = img.width;
114 canvas.height = img.height;
115 ctx.drawImage(img, 0, 0);
116 return canvas;
117}
3function getImageDataFromImage(image) {
4 let canvas = document.createElement("canvas"),
5 context = canvas.getContext("2d"),
6 w = image.width,
7 h = image.height;
8
9 canvas.width = w;
10 canvas.height = h;
11
12 context.drawImage(image, 0, 0);
13
14 return context.getImageData(0, 0, w, h);
15}
483function doImage(err, canvas) {
484 var img = document.createElement('img');
485 var dimensions = map.getSize();
486 img.width = dimensions.x;
487 img.height = dimensions.y;
488 img.src = canvas.toDataURL("image/png");
489
490 var suffixe_file = $("select").val()[0];
491 var suffix;
492 auj = new Date();
493 auj.setDate(auj.getDate() - 1);
494 auj = auj.getFullYear() + '_' + parseInt(auj.getMonth() + 1) + '_' + auj.getDate();
495 if (suffixe_file === "1") {
496 suffix = 'centres_ebola_guinee_' + auj;
497 }
498 else if (suffixe_file === "2") {
499 suffix = 'cte_guinee_' + auj;
500 }
501 else if (suffixe_file === "3") {
502 suffix = 'cdt_guinee_' + auj;
503 }
504 else if (suffixe_file === "4") {
505 suffix = 'cts_guinee_' + auj;
506 }
507 else{
508 suffix = 'labos_guinee_' + auj;
509 };
510
511 $("a#print").attr("download", suffix + '.png')
512 $("a#print").attr("href", img.src)
513
514 $('#wheel').hide();
515 $("a#print").html("Télécharger la carte");
516 $('.dlmap').fadeIn("slow");
517 }

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