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Skip conversion to radians

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Constantin Wartenburger 2020-10-08 00:56:36 +02:00
parent 26b8ef8af9
commit efa7c66d98
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GPG Key ID: 7439D96D8E1DB894
1 changed files with 6 additions and 5 deletions
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11
vector/src/main/java/im/vector/app/features/home/room/detail/composer/rainbow/RainbowGenerator.kt
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@ -31,7 +31,7 @@ class RainbowGenerator @Inject constructor() {
fun generate(text: String): String { fun generate(text: String): String {
val split = text.splitEmoji() val split = text.splitEmoji()
val frequency = 360.0 / split.size val frequency = 2 * Math.PI / split.size
return split return split
.mapIndexed { idx, letter -> .mapIndexed { idx, letter ->
@ -48,21 +48,21 @@ class RainbowGenerator @Inject constructor() {
} }
private fun generateAB(hue: Double, chroma: Float): Pair<Double, Double> { private fun generateAB(hue: Double, chroma: Float): Pair<Double, Double> {
val radians = Math.toRadians(hue) val a = chroma * 127 * cos(hue)
val b = chroma * 127 * sin(hue)
val a = chroma * 127 * cos(radians)
val b = chroma * 127 * sin(radians)
return Pair(a, b) return Pair(a, b)
} }
private fun labToRGB(l: Int, a: Double, b: Double): RgbColor { private fun labToRGB(l: Int, a: Double, b: Double): RgbColor {
// Convert CIELAB to CIEXYZ (D65)
var y = (l + 16) / 116.0 var y = (l + 16) / 116.0
val x = adjustXYZ(y + a / 500) * 0.9505 val x = adjustXYZ(y + a / 500) * 0.9505
val z = adjustXYZ(y - b / 200) * 1.0890 val z = adjustXYZ(y - b / 200) * 1.0890
y = adjustXYZ(y) y = adjustXYZ(y)
// Linear transformation from CIEXYZ to RGB
val red = 3.24096994 * x - 1.53738318 * y - 0.49861076 * z val red = 3.24096994 * x - 1.53738318 * y - 0.49861076 * z
val green = -0.96924364 * x + 1.8759675 * y + 0.04155506 * z val green = -0.96924364 * x + 1.8759675 * y + 0.04155506 * z
val blue = 0.05563008 * x - 0.20397696 * y + 1.05697151 * z val blue = 0.05563008 * x - 0.20397696 * y + 1.05697151 * z
@ -78,6 +78,7 @@ class RainbowGenerator @Inject constructor() {
} }
private fun gammaCorrection(value: Double): Double { private fun gammaCorrection(value: Double): Double {
// Non-linear transformation to sRGB
if (value <= 0.0031308) { if (value <= 0.0031308) {
return 12.92 * value return 12.92 * value
} }