0 -> #ff0000
10 -> #ff4d00
20 -> #ff9900
30 -> #ffe500
40 -> #ccff00
50 -> #80ff00
60 -> #33ff00
70 -> #00e619
80 -> #009966
90 -> #004db3
100 -> #0000ff
-0.5 -> #ff0000
-0.4 -> #ff3333
-0.3 -> #ff6666
-0.2 -> #ff9999
-0.1 -> #ffcccc
0 -> #ffffff
0.1 -> #ccffcc
0.2 -> #99ff99
0.3 -> #66ff66
0.4 -> #33ff33
0.5 -> #00ff00
This is a heatmap-style colouring that represents the relative popularity of Linux distros. Red is hottest and black is coldest.
|Linux Distribution||Popularity (average hits per day)|
I drew this with HTML5 Canvas, but the below image is just a screen capture.
A working demo of these examples—with source code—are in the example.html file in the github repository.
The Rainbow class by default maps the range 0 to 100 (inclusive) to the colours of the rainbow (i.e., a gradient transitioning from red to yellow to lime to blue).
var rainbow = new Rainbow(); creates new instance of Rainbow. By default, the number range is from 0 to 100, and the spectrum is a rainbow.
rainbow.colourAt(number); returns the hex colour corresponding to the number. If number is out of range, it returns the appropriate hex colour corresponding to either the minNumber or maxNumber.
rainbow.setSpectrum(colour1, colour2 [,colourN]); sets the spectrum of the Rainbow object. By default, the spectrum is a rainbow. You must have a minimum of two colours, but you can specify more than two colours. Colours can be in the form ‘red’, ‘ff0000’, or ‘#ff0000’. For example,
rainbow.setSpectrum('red', 'yellow', 'white'); makes the “Rainbow” a colour gradient from red to yellow to white.
rainbow.setNumberRange(minNumber, maxNumber); sets the number range of the Rainbow object. By default, it is 0 to 100.
If you find any bugs, please let me know.