DigiToffee

Today I am going to show you how to create a basic code highlighter for website. This UI is actually inspired by sixrevisions.com. I have added functionality of showing line numbers.
Following things will be covered
How to add line numbersHow to highlight single line comments i.e. those lines which starts with //How to highlight comment blocks i.e. those lines which are enclosed within /* */
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To use this code highlighter you have to wrap your code inside <pre> tags. Really there is nothing new in it. It is the same traditional old method. <code> tag is another way of adding code into your post. However there is a difference between <pre> and <code> tag. To give analogy of their working I would give example of <div> and <span> respectively. This means <pre> is a block tag and <code> tag can be used inline.
One important thing we need to consider is, in WordPress if you want to post HTML code then you have to es…

In this post we will see how to draw lines using mouse with KineticJS canvas library. First we will go through a basic logic for drawing line. Also we will see how this logic can be implemented for KineticJS.

live Demo | Download Code
Logic for drawing line on canvas using mouse
Listen for mousedown, mousemove, mouseup events on canvason mousedown
store x1, y1 relative to canvas element
set started = trueon mousemove
if started = false then exit
get current x, y
element = line(x1, y1, x, y)on mouseup
if started = false then exit
get current x, y
element = line(x1, y1, x, y) Explanation is as below
Add following div into body
<div id="canvasArea"> </div> Initialize a stage and layers
var stage = new Kinetic.Stage({ container: 'canvasArea', width: 500, height: 500, draggable: false }), layer = new Kinetic.Layer({ name: 'layer' }), tmpLayer = new Kinetic.Layer({ name: 'tmpLayer' }); In above co…