May 18, 2012 · Hi there I have a question about dynamically creating a canvas using javascript. I create a canvas like this: var canvas = document.createElement('canvas'); canvas.id = "CursorLayer"; canvas....

Aug 7, 2013 · You can create a new canvas the same way you’d create any element: var newCanvas = document.createElement('canvas'); Then you can copy over your old canvas: newCanvas.width = oldCanvas.width; newCanvas.height = oldCanvas.height; oldCanvas.parentNode.replaceChild(newCanvas, oldCanvas); ctx = newCanvas.getContext('2d');

Dec 2, 2014 · There is no Canvas constructor. If you want to ceate a new <canvas> element, use var canvas = document.createElement("canvas");. *PS. This answer seems to solve your previous question. Use the Accept answer feature to mark the answer as the right one. –

Aug 5, 2012 · At the moment it adds the canvas element to the body, how can I get it to add it to a div named ...

You can create a new canvas element with document.createElement: var canvas = document.createElement('canvas'); and then get the context from it. Just make sure you set the width and height. You don't have to add the canvas to the tree in order to make it work: DEMO. But you definitely have to create that node. You could create a function for ...

I am trying to use Javascript in order to add a canvas to one page which originally does not have one. I am trying to do the following: var canv=document.createElement("canvas"); canv.setAttribute...

Jun 16, 2012 · var canvas = document.getElementById('myCanvas'); var ctx = canvas.getContext('2d'); there are times I need to keep all my canvas biznass in a .js file (ex when I want to dynamically change the width/height of the element) and I'll do it like this:

You have to use .onload. let canvas = document.getElementById("myCanvas"); let ctx = canvas.getContext("2d"); const drawImage = (url) => { const image = new Image ...

Jan 29, 2011 · If (as in my case) you just want the starting point to be the middle top of the polygon rather than the middle right, flip the sin and cos calls and change Ycenter + to Ycenter - on both places (leaving it as a sum rather than a difference of the values results in it starting with a point at the bottom of the resultant shape).

Interestingly enough, if you create a canvas object and store its context in a variable, that variable has its own pointer to the canvas object. Since you can't use getContext("2d") without a canvas, you might as well only have one canvas pointer.