Konva - drawing arrows on a path
Ever needed to put a direction of flow indicator on some connector line? In this post I explain a simple approach to get that done.
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Konva
Posts about Konva.js, the JavaScript library adding an object model and other super powers to the HTML5 canvas lib.
Konva - text and web-fonts, use a font loader
The font loading process is a stumbling block for folks new to using web-fonts in conjunction with Konva.Text and in the canvas. In this short post I'll explain what the problem is, how to solve it, and provide links to sample code. Read on...
Konva - How to edit and save points on a line or polygon
Editing line points or vertices of a polygon is a recurring question I see in the Konva Discord. It gets tricky when the line or its parents are affected by transforms. Here's how to make a bulletproof solution that handles that.
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Konva - Relativity and why your shapes aren't where you expect
We are often required to position shapes relative to each other - maybe circles mark points on a line - but then you move one of the shapes and update the others position but it doesn't make sense. The answer is relativity!
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Konva - masked image
So you need to make an image mask. That means making a shape and drawing the image into that shape so that the area of the image outside the shape is cut off. But you can't use a path so clipping is off the menu. How to get the mask with composition operations or fill pattern image...
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Konva - styling transformer anchors
One of the common requirements we see coming through the Konva Discord channel is modifying the stock Transformer anchors with popular requests being how to change the anchors shape and colors, and how use an icon for the rotation anchors. Lets take a look...
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Konva - composing & blend modes
The HTML5 canvas has the globalCompositeOperation feature which lets us control how new content being drawn onto the canvas will play with the content that is already there. Konva's API lets us apply it to our shapes. I was curious to visualize and understand what it does..
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Node-canvas and CSS font descriptions
I'm developing an app that will generate / layout rich text in a canvas. So far my focus has been on the browser but now I need to do some automated testing for which I use node. But node doesn't provide text support out-of-the-box so we have to use node-canvas. How to work with text in node-canvas?
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