This content originally appeared on Lea Verou’s blog and was authored by Lea Verou
A while ago, I posted a script of mine for creating 2-color cross-browser imageless linear gradients. As I stated there, I needed them for a color picker I have to create. And even though 2-color gradients are sufficient for most components, in most color spaces, I had forgotten an important one: Hue. You can’t represent Hue with a 2-color gradient! So, I had to revise the script, and make it able to produce linear gradients of more than 2 colors. Furthermore, I needed to be able to specify a fully transparent color as one of the gradient colors, in order to create the photoshop-like 2d plane used by the picker (and no, a static image background like the one used in most JS color pickers wouldn’t suffice, for reasons irrelevant with this post). I hereby present you Cross-browser, imageless, linear gradients v2!
The API has stayed just the same, with the following differences:
-
You may specify the keyword “transparent” instead of a #RRGGBB color (that was such a pain to implement btw!).
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When creating a Gradient object, color strings are now defined in an array. Example:
var g = new Gradient(200, 100, [‘#000000’, ‘#ff1166’, ‘#23ff46’], true);
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When calling
g.paint()it now takes 2 arguments instead of 3: The new color array (or null if you don’t want that to change) and the direction (true for vertical, false for horizontal). For example:g.paint([‘#000000’, ‘#ff1166’, ‘#23ff46’], true);
-
2 new methods have been added:
g.setColorAt(index, color)andg.direction(newDirection). The first allows you to set a particular gradient color (index starting from 0) and the second to alter or toggle the direction (if you specify a direction parameter, you set the direction, if you call it with no parameters, it toggles from horizontal to vertical). -
The fields
g.startColorandg.endColorhave been replaced by the arrayg.colors.
Update: v2.0.1 Fixed a small bug with the ‘transparent’ keyword that affected multi-color gradients in browsers != IE when the transparent color wasn’t first or last.
Enjoy:
This content originally appeared on Lea Verou’s blog and was authored by Lea Verou
Lea Verou | Sciencx (2009-04-24T00:00:00+00:00) Cross-browser imageless linear gradients v2. Retrieved from https://www.scien.cx/2009/04/24/cross-browser-imageless-linear-gradients-v2/
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