First of all: what am I trying to do?  I have an application to view images. It uses the canvas element to render the image. You can zoom in, you can zoom out, and you can drag it around. This part works perfectly right now.  But let's say I have...
I have a small image, which I am rendering on a canvas, like this:  ctx.drawImage(img, 0, 0, img.width*2, img.height*2);   I would like this to show a sharp upsized image (4 identical pixels for each image pixel). However, this code (in Chrome 29 on...
This seems like it should be quite simple, but for some reason I can't quite wrap my brain around it. I have an image inside a "viewport" div, of which the overflow property is set to hidden.  I've implemented a simple zooming and pan...
I'm having some problems with scaling a container to a fixed point. In my case I'm trying to scale (zoom) a stage to the mouse cursor.  Here is a way to do with pure canvas: http://phrogz.net/tmp/canvas_zoom_to_cursor.html (as discussed at Zo...
I have multiple canvas in one screen using fabricJS.  I have added some ITexts, Text Box, Image, Background in each canvas.  I have some scalling options, like 25%, 50%, 100% to 300% in increasing order of 25%.  If my current default scale is 100% it...
We did some work on an app that lets people fire baseballs over the internet.  It lives entirely within Amazon's AWS ecosystem, and we're building off that for a new project. The stack includes:  -Dedicated MongoDB and Redis servers -three di...
I have the following Javascript, HTML and CSS code    function distanceBetween(point1, point2) {     return Math.sqrt(Math.pow(point2.x - point1.x, 2) + Math.pow(point2.y - point1.y, 2)); }  function angleBetween(point1, point2) {     return Math.ata...
So I have a onChange listener on an input type image which triggers the appending of an image element onto the svg. The problem comes when i try to scale the image with viewbox or other methods. The image element is attached to the svg but it only co...
I am wanting to scale on a multi-core machine. Using the cluster library is an option, but I would like to know if I can do this a more simple way: by simply running multiple servers.  So what I want to know is this: does Node.js automatically spread...
What is the best practice to scale a node app on Heroku?  When should I increase dynos, when workers?  The Heroku website says  Crank your web dynos to increase HTTP performance. Crank your worker dynos to empty the queue faster.   I am not quite sur...

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