planning

node_modules/@mapbox/mapbox-gl-style-spec/util/interpolate.js

@@ -0,0 +1,22 @@
+// @flow
+
+import Color from './color.js';
+
+export function number(a: number, b: number, t: number): number {
+    return (a * (1 - t)) + (b * t);
+}
+
+export function color(from: Color, to: Color, t: number): Color {
+    return new Color(
+        number(from.r, to.r, t),
+        number(from.g, to.g, t),
+        number(from.b, to.b, t),
+        number(from.a, to.a, t)
+    );
+}
+
+export function array(from: Array<number>, to: Array<number>, t: number): Array<number> {
+    return from.map((d, i) => {
+        return number(d, to[i], t);
+    });
+}