feature: add colorHSV2RGB

src/color/colorHSV2RGB.ts

@@ -0,0 +1,20 @@
+import { RawRGB } from './RawRGB';
+import { lerp } from '../math/utils';
+
+/**
+ * Convert a color from HSV to RGB.
+ * Each component of the HSV must be given in [0 - 1] range.
+ *
+ * Ref: https://en.wikipedia.org/wiki/HSV_color_space
+ */
+export function colorHSV2RGB( [ h, s, v ]: [ number, number, number ] ): RawRGB {
+  const ht = h % 1.0 * 6.0;
+
+  return [ 0.0, 4.0, 2.0 ].map( ( p ) => {
+    const colH = Math.min( Math.max( (
+      Math.abs( ( ht + p ) % 6.0 - 3.0 ) - 1.0
+    ), 0.0 ), 1.0 );
+    const colS = lerp( 1.0, colH, s );
+    return v * colS;
+  } ) as RawRGB;
+}

src/color/index.ts

@@ -1,4 +1,5 @@
 export * from './colorFromAtariST';
+export * from './colorHSV2RGB';
 export * from './colorToHex';
 export * from './colorTurbo';
 export * from './eotfRec709';

src/color/tests/colorHSV2RGB.test.ts

@@ -0,0 +1,14 @@
+import '../../tests/matchers/toBeCloseToArray';
+import { colorHSV2RGB } from '../colorHSV2RGB';
+
+describe( 'colorHSV2RGB', () => {
+  it( 'converts the input HSV into RGB', () => {
+    const subject = colorHSV2RGB( [ 152.0 / 360.0, 0.59, 0.86 ] );
+
+    expect( subject ).toBeCloseToArray( [
+      90.0 / 255.0,
+      219.0 / 255.0,
+      159.0 / 255.0,
+    ] );
+  } );
+} );