I'm using the Google Maps API and have added markers. Now I want to add a 10 mile radius around each marker, meaning a circle that behaves appropriately while zooming. I have no idea how to do that and it seems it's not something common.  I f...
So far none of the threads here on smooth lines are correct.  how to draw smooth curve through N points using javascript HTML5 canvas?  Smooth user drawn lines in canvas  Both result in jagged lines. By smooth I mean using the x,y points as control p...
I'm writing an HTML5 canvas drawing app, and I need to be able to tell whether or not the left mouse button is pressed down during a mousemove event. On Chrome, this works:  if (event.which == 1) { <do stuff> }   But in FireFox, event.which...
I have 3 x,y points that I am trying to use to draw a right trangle.  So I am calculating the angles of the triangle after calculating side lengths.  After I have gotten the hypotenuse's length, I want to rotate the hypotenuse so that it complete...
I am trying to create a background for my website that uses canvases to draw stuff, get the data URL of it and set it as the background-image property of an element. The method works, but I can't find a good way to draw a cloud on the canvas. Oth...
I'm currently thinking about using fabric.js for an on-line handwriting recognition system. For such a system, I would need to send the drawn lines as a list of lines, where each line is a list of points.  So if the user has drawn an "x"...
I trying to do an anti-aliasing drawing function in canvas. Thanks to all the super answers on this site about canvas and aliasing.   here's the demo: https://jsfiddle.net/garciaVvV/eu34c8sy/12/  here's the line js:   function lineXY(mouseX,...
My trigonometry is more than weak, and therefore I do not know how to draw a line segment shorter than full lines start point and end point.  http://jsfiddle.net/psycketom/TUyJb/  What I have tried, is, subtract from start point a fraction of target...
This is a script for filling canvas' grid squares with red color. I'm looking for tips how to optimize my script to fill squares continuously, without chopping like here:   I tried to separate and merge some functions, but can't find a so...
I want to draw a Sankey diagram using Javascript. Can anyone provide some direction regarding the algorithms or libraries that are available for this?...

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