Posts about Konva.js, the JavaScript library adding an object model and other super powers to the HTML5 canvas lib.
When you start zooming with Konva you quickly get frustrated about how to zoom relative to the mouse position pr center point and not the top-left corner of the stage. Here's how to get that fixed...
I'm generally interested in text layout for couple of side projects so I'm keen to see what Konva can do for me with its Text object. A little research shows the HTML canvas is a little light on text support, but Konva has your back...within limits...
Take your protein pills and put your helmet on, strap yourselves in and hold on tight - we're embarking on a rollercoaster ride to try and find a reliable, robust & repeatable approach to measuring line height on the HTML5 canvas.
A quick run through of some of the principles of working with text and breaking away from relying on textOut and Text object from the Konva HTML5 canvas library.
This is from a StackOverflow answer I made in response to a request for a way to show a route on a map with bends. In essence this is manipulation of the points array for a Konva Line object.
I've seen a few questions on The 'Net around how the HTML5 canvas fits into the DOM and whether canvas content can be styled via CSS - here's my explanation. I also mention a few libraries and why you would want to use them...
Thinking about shape-point collision detection in a case where there are many shapes on the stage, and how to improve performance. Here's my explanation of those functions and an possibly better approach.