Should there be a lerp? #5
Description
Better color lerping is the kind of thing I'd reach for a perceptual colorspace for, so I'm a little surprised to see that there doesn't seem to be a lerp function here.
Though I'm not sure how that would be implemented.
Right now, I'm using this:
double sign(double v) => v > 0 ? 1 : -1;
HSLuvColor lerpHsluv(HSLuvColor a, HSLuvColor b, double p) {
// find the shortest route through the hue circle
var forwards = (b.hue - a.hue);
var backwards = -(360 - forwards.abs()) * sign(forwards);
var huePath = forwards.abs() < backwards.abs() ? forwards : backwards;
return HSLuvColor.fromHSL(
(a.hue + p * huePath) % 360,
lerpDouble(a.saturation, b.saturation, p)!,
lerpDouble(a.lightness, b.lightness, p)!);
}but of course, it does a kind of rainbow effect when the hues are far apart, which is not always going to be what people want.