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Zoran Ravic ZoranRavic
mjackson
/ color-conversion-algorithms.js
Last active
October 28, 2024 10:49
RGB, HSV, and HSL color conversion algorithms in JavaScript
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| /** | |
| * Converts an RGB color value to HSL. Conversion formula | |
| * adapted from http://en.wikipedia.org/wiki/HSL_color_space. | |
| * Assumes r, g, and b are contained in the set [0, 255] and | |
| * returns h, s, and l in the set [0, 1]. | |
| * | |
| * @param Number r The red color value | |
| * @param Number g The green color value | |
| * @param Number b The blue color value | |
| * @return Array The HSL representation |
neilmendoza
/ gist:4512992
Last active
June 9, 2023 14:22
Function to return matrix for rotation about an arbitrary axis in GLSL.
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| mat4 rotationMatrix(vec3 axis, float angle) | |
| { | |
| axis = normalize(axis); | |
| float s = sin(angle); | |
| float c = cos(angle); | |
| float oc = 1.0 - c; | |
| return mat4(oc * axis.x * axis.x + c, oc * axis.x * axis.y - axis.z * s, oc * axis.z * axis.x + axis.y * s, 0.0, | |
| oc * axis.x * axis.y + axis.z * s, oc * axis.y * axis.y + c, oc * axis.y * axis.z - axis.x * s, 0.0, | |
| oc * axis.z * axis.x - axis.y * s, oc * axis.y * axis.z + axis.x * s, oc * axis.z * axis.z + c, 0.0, |