I got a strange problem with the "DrawImage"-Methode of the Canvas element. With the following code I create the canvas and attache it to the "rightcanvas" div.
var rightcanvas = document.getElementById('rightcanvas');
rcanvas = document.createElement('canvas');
rcanvas.setAttribute('width', canvasLength);
rcanvas.setAttribute('height', canvasHeight);
rcanvas.setAttribute('id', 'rcanvas');
rightcanvas.appendChild(rcanvas);
And now I try to draw a Base64 encoded image.
var rcontext = rcanvas.getContext('2d');
var image = new Image();
image.src = 'data:image/png;base64,iVBOR....';
rcontext.drawImage(image,0,0);
The canvas will be created and attached. But the image will not be displayed.Does somebody know what the problem is? =(
You have to wait for the image to load before drawing it to the canvas.
var image = new Image();
image.onload = function() {
rcontext.drawImage(image, 0, 0);
}
image.src = 'data:image/png;base64,iVBOR....';
Related
I load a picture and draw it on canvas. With the mouse I can draw on the picture. Now I want to copy a defined part of an another picture to the same part of the shown picture. I thought I can copy the pixels from img2 to img1. Another idea is to place the pictures on top of the other (img1 oder img2) and cut an area from img1.
I don't know what is a possible way.
My try:
function loadPic() {
var ctx2 = document.getElementById('can').getContext('2d');
img = new Image();
img2 = new Image();
img.onload = function() {
ctx2.drawImage(img,0,0);
}
img.src = 'Haut vorne m.bmp';
img2.src = 'Muskeln vorne m.bmp';
}
And the copy:
var g = img2.getImageData(262, 157, 200, 200);
ctx.putImageData(g, 55, 170);
I get an error: img2.getImageData is not a function
Can anybody help ?
Thank you !
getImageData() is a function of canvas, not of Image. See here.
Replace img2.getImageData(...) with ctx.getImageData(...) or ctx2 if that's what you have.
I have a whiteboard option during a video call in my web application built in angularjs (1.x). Users can draw above the video in a canvas element. I need to take a screenshot of the current video position and drawing on the canvas. I am able to get the video frame as base64 URL(second image) and canvas drawing as base64 URL(third image) separately. But I need to get it as a combined single image in base64 URL like the first image.
HTML
<img id="img1">
<img id="img2">
<canvas id="mergedImage" width="382" height="510"></canvas>
JS
var drawingImg1 = document.getElementById('img1');
drawingImg1.setAttribute('src', img1);
var drawingImg2 = document.getElementById('img2');
drawingImg2.setAttribute('src', img2);
var c = document.getElementById('mergedImage');
var width = 382;
var height = 510;
var ctx = c.getContext("2d");
var imageObj2 = new Image();
imageObj2.onload = function (){
ctx.drawImage(imageObj2, 0, 0, width, height);
var imageObj1 = new Image();
imageObj1.onload = function (){
imageObj1.style.objectFit = "cover";
ctx.drawImage(imageObj1, 0, 0,width, height);
};
imageObj1.src = img2;
};
imageObj2.src = img1;
I tried the above code and it gives the output as video frame image only not the drawing included.
I want the output as the first image. Please, someone, guide me to do this.
I have created a jsfiddle here
The following solution worked for me to overlap 2 images and got a single image in a canvas.
Link
I have 3 canvases. I crop a region from canvas1 and display it on canvas 2 . Then I want to convert canvas 2 image to a URL and to see if can convert that URL back to a image. I want it to be displayed in canvas c4.Any help is appreciated.
// image is drawn here , I want this image to be converted to a dataURL
//then back to image and display it in canvas c4
var c2 = document.getElementById("area_c2");
var ctx = c.getContext("2d");
var ctx2 = c2.getContext("2d");
image_src.width = c2.width;
image_src.height = c2.height;
ctx2.drawImage(image_src, 0, 0,image_src.width, image_src.height);
var c4 = document.getElementById("area_c4");
var ctx4 = c4.getContext("2d");
var dataURL = c2.toDataURL();
var myImg = new Image;
myImg.src = dataURL;
myImg.width = c4.width;
myImg.height = c4.height;
ctx4.drawImage(myImg, 0, 0, image_src.width, image_src.height); //Image //is not displayed here , I want the image to take the size of the canvas
<canvas id ="area_c2" style="width:300px;height:300px;border:3px solid
black;z-index:1" >
</canvas>
<canvas id ="area_c4" style="width:300px;height:300px;border:3px solid
black;z-index:1;background:red">
</canvas>
The reason your solution did not work is because you did not wait for the onload event. Before the onload event the image will not render.
To convert a canvas to a data URL is simple, use the .toDataURL(); method of the canvas element.
Then to convert the data URL back to an canvas image, you would first have to create an Image element and set its source as the dataURL. After getting the image onload event you can draw the image onto the canvas. This could be accomplished as shown:
Assuming the data URL is in a variable called dataURL, the canvas context is in a variable called ctx.
var img = new Image;
img.onload = () => { ctx.drawImage(img, 0, 0); };
img.src = dataURL;
The final solution would go like this:
var cdata2 = c2.toDataURL();
var cimg2 = new Image;
cimg2.onload = () => { ctx4.drawImage(cimg2, 0, 0, c4.width, c4.height); };
PS: You don't have to scale the image object by specifying the width and height, the canvas will do that when you specify the destination width and height.
I want to save an image of the canvas tag, but when i try create an image from the canvas it tells me "SecurityError: The operation is insecure", which i believe is problems with the canvas coming from another domain than what im on. This canvas is a map which is generated with openlayers3.
var canvas = document.getElementsByClassName('ol-unselectable')[0];
var dataURL = canvas.toDataURL('image/png');
var window = window.open();
window.document.write('<img src='+dataURL+'/>');
I've also tried
canvas.toBlob(function(blob) {
saveAs(blob, 'map.png')
}
Is there an easy work around so the canvas is not tainted?
You tried write in new browser window from another window this is impossible without https protocol or localhost. But you can create new img in currently window.
var canvas = document.getElementsByClassName('ol-unselectable')[0];
var dataURL = canvas.toDataURL('image/png');
var img = new Image();
img.width = 1000;
img.height = 1000;
img.src = dataURL;
img.onload = function () {
document.body.append(img);
}
I'm using a plugin (dom-to-image) to generate a SVG content from a div.
It returns me a dataURL like this:
data image/xml, charset utf-8, <svg...
If a put this on a <img src the image is shown to normally.
The intent is to grab this dataURL, convert it to base64 so I can save it as an image.png on a mobile app.
Is it possible?
I tryied this solution https://stackoverflow.com/a/28450879/1691609
But coudn't get to work.
The console fire an error about the dataUrl
TypeError: Failed to execute 'serializeToString' on 'XMLSerializer': parameter 1 is not of type 'Node'.
==== UPDATE :: PROBLEM EXPLANATION/HISTORY ====
I'm using Ionic Framework, so my project is an mobile app.
The dom-to-image is already working cause right now, its rendering a PNG through toPng function.
The problem is the raster PNG is a blurry.
So I thought: Maybe the SVG will have better quality.
And it IS!! Its 100% perfect, actually.
On Ionic, I'm using 2 step procedure to save the image.
After get the PNG generated by the dom-to-img(base64) dataURL, I convert it to a Blob and then save into device.
This is working, but the final result, as I said, is blurry.
Then with SVG maybe it will be more "high quality" per say.
So, in order to do "minimal" change on a process that s already working :D I just need to convert an SVG into base64 dataURL....
Or, as some of you explained to me, into something else, like canvas...
I don't know any much :/
===
Sorry for the long post, and I really, really thank your help guys!!
EDIT COUPLE OF YARS LATER
Use JS fiddle for a working example: https://jsfiddle.net/msb42ojx/
Note, if you don't own DOM content (images), and those images don't have CORS enabled for everyone (Access-Control-Allow-Origin header), canvas cant render those images
I'm not trying to find out why is your case not working, here is how I did when I had something similar to do:
get the image sourcce (dom-to-image result)
set up a canvas with that image inside (using the image source)
download the image from canvas in whatever image you like: png, jpeg whatever
by the way you can resize the image to a standard format
document.getElementById('mydownload').onclick= function(){
var wrapper = document.getElementById('wrapper');
//dom to image
domtoimage.toSvg(wrapper).then(function (svgDataUrl) {
//download function
downloadPNGFromAnyImageSrc(svgDataUrl);
});
}
function downloadPNGFromAnyImageSrc(src)
{
//recreate the image with src recieved
var img = new Image;
//when image loaded (to know width and height)
img.onload = function(){
//drow image inside a canvas
var canvas = convertImageToCanvas(img);
//get image/png from convas
var pngImage = convertCanvasToImage(canvas);
//download
var anchor = document.createElement('a');
anchor.setAttribute('href', pngImage.src);
anchor.setAttribute('download', 'image.png');
anchor.click();
};
img.src = src;
// Converts image to canvas; returns new canvas element
function convertImageToCanvas(image) {
var canvas = document.createElement("canvas");
canvas.width = image.width;
canvas.height = image.height;
canvas.getContext("2d").drawImage(image, 0, 0);
return canvas;
}
// Converts canvas to an image
function convertCanvasToImage(canvas) {
var image = new Image();
image.src = canvas.toDataURL("image/png");
return image;
}
}
#wrapper{
background: red;
color: blue;
}
<script src="https://rawgit.com/tsayen/dom-to-image/master/src/dom-to-image.js"></script>
<button id='mydownload'>Download DomToImage</button>
<div id="wrapper">
<img src="http://i.imgur.com/6GvKdxY.jpg"/>
<div> DUDE IS WORKING</div>
<img src="http://i.imgur.com/6GvKdxY.jpg"/>
</div>
I translated #SilentTremor's solution into React/JS-Class:
class SVGToPNG {
static convert = function (src) {
var img = new Image();
img.onload = function () {
var canvas = SVGToPNG.#convertImageToCanvas(img);
var pngImage = SVGToPNG.#convertCanvasToImage(canvas);
var anchor = document.createElement("a");
anchor.setAttribute("href", pngImage.src);
anchor.setAttribute("download", "image.png");
anchor.click();
};
img.src = src;
};
static #convertImageToCanvas = function (image) {
var canvas = document.createElement("canvas");
canvas.width = image.width;
canvas.height = image.height;
canvas.getContext("2d").drawImage(image, 0, 0);
return canvas;
};
static #convertCanvasToImage = function (canvas) {
var image = new Image();
image.src = canvas.toDataURL("image/png");
return image;
};
}
export default SVGToPNG;
Usage:
let dataUrl = someCanvas.toDataURL("image/svg+xml");
SVGToPNG.convert(dataUrl);