scratchfoundation/paper.js
1
0
Fork 0
mirror of https://github.com/scratchfoundation/paper.js.git synced 2025-01-19 06:00:56 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

packed hsl-rgb conversion code a bit

Browse source
This commit is contained in:
gka 2011-07-05 20:25:35 +02:00
parent 0e37d9e93d
commit 46483ee431
1 changed files with 10 additions and 25 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

35
src/color/Color.js
View file

@ -173,25 +173,17 @@ var Color = this.Color = Base.extend(new function() {
b = color._blue,
max = Math.max(r, g, b),
min = Math.min(r, g, b),
l = (max + min) / 2,
s, h;
h, s, l = (max + min) / 2;
if (max == min) {
s = 0;
h = Number.NaN
h = s = 0;
} else {
if (l < 0.5) {
s = (max - min) / (max + min);
} else {
s = (max - min) / (2 - max - min);
}
s = l < 0.5 ? (max - min) / (max + min) : (max - min) / (2 - max - min);
}
if (r == max) {
h = (g - b) / (max - min);
} else if (g == max) {
h = 2 + (b - r) / (max - min);
} else {
h = 4 + (r - g) / (max - min);
switch (max) {
case r: h = (g - b) / (max - min); break;
case g: h = 2 + (b - r) / (max - min); break;
case b: h = 4 + (r - g) / (max - min); break;
}
h *= 60;
if (h < 0) h += 360;
@ -200,7 +192,7 @@ var Color = this.Color = Base.extend(new function() {
'hsl-rgb': function(color) {
var s = color._saturation,
h = color._hue,
h = color._hue / 360,
l = color._lightness,
t1, t2, t3, c, r, g, b, i;
@ -209,17 +201,11 @@ var Color = this.Color = Base.extend(new function() {
} else {
t3 = [0,0,0];
c = [0,0,0];
if (l < 0.5) {
t2 = t2 = l * (1 + s);
} else {
t2 = l + s - l * s;
}
t1 = 2 * l - t2;
h = h / 360;
t2 = l < 0.5 ? l * (1 + s) : l + s - l * s;
t1 = 2 * l - t2;
t3[0] = h + 1 / 3;
t3[1] = h;
t3[2] = h - 1 / 3;
for (i = 0; i<3; i++) {
if (t3[i] < 0) t3[i] += 1;
if (t3[i] > 1) t3[i] -= 1;
@ -228,7 +214,6 @@ var Color = this.Color = Base.extend(new function() {
else if (3 * t3[i] < 2) c[i] = t1 + (t2 - t1) * ((2 / 3) - t3[i]) * 6;
else c[i] = t1;
}
return new RGBColor(c[0], c[1], c[2], color._alpha);
}
},