To change width is not that hard. Just remove the width attribute from the tag and add width: 100%; in the css for #canvas Changing height is a bit harder: you need javascript. I have used jQuery because i’m more comfortable with. you need to remove the height attribute from the canvas tag and add this script: You can see this fiddle: https://jsfiddle.net/1a11p3ng/3/ … Read more
Given that canvas is a canvas element or an OffscreenCanvas object,
You can use canvas’ context.translate & context.rotate to do rotate your image Here’s a function to draw an image that is rotated by the specified degrees: Here is code and a Fiddle: http://jsfiddle.net/m1erickson/6ZsCz/
This example works fine for me. I think you need to do two things: remember to set the width and height properties on the canvas, and then you can set the canvas width to 100% and its height to auto. It should cause the canvas to always be the full width of its container and force its height to remain in proportion. … Read more
Your value: is a jQuery object, not a pure Canvas element. To turn it back so you can call getContext(), call this.element.get(0), or better yet store the real element and not the jQuery object: See running code at http://jsfiddle.net/alnitak/zbaMh/, ideally using the Chrome Javascript Console so you can see the resulting object in the debug … Read more
Your code seems right, this is running for me on Windows 7 (Python 3.6): resulting in this tkinter GUI: with this image as bll.jpg: (imgur converted it to bll.png but this is working for me as well.) More options: This answer mentions, tkinter is working only with gif images. Try using a .gif image. If this is not working, use PIL as stated in this answer. … Read more
I’m currently building a HTML5 web app/Phonegap native app and I can’t seem to figure out how to save my canvas as an image with canvas.toDataURL(). Can somebody help me out? Here’s the code, what’s wrong with it? //My canvas was named “canvasSignature” JavaScript:
So may be my question should be how to change the screen size showed in editor? To change the screen size, go to the Game window (accessed by the menu “Window->General->Game”). At the top of the window will be a screen size menu (outlined in green, below) to change the screen size. When pressed, it … Read more
You can use down-stepping to achieve better results. Most browsers seem to use linear interpolation rather than bi-cubic when resizing images. (Update There has been added a quality property to the specs, imageSmoothingQuality which is currently available in Chrome only.) Unless one chooses no smoothing or nearest neighbor the browser will always interpolate the image after down-scaling it as this … Read more
I guess the problem is your js runs before the html is loaded. If you are using jquery, you can use the document ready function to wrap your code: Or simply put your js after the <canvas>.