From b017f48eaa7f36495afa1057b79a557a2fbb73a7 Mon Sep 17 00:00:00 2001
From: "Kali Kaneko (leap communications)" <kali@leap.se>
Date: Thu, 1 Sep 2016 17:38:42 -0400
Subject: [pkg] move bitmask.js to new path

---
 www/app/lib/color.js | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 www/app/lib/color.js

(limited to 'www/app/lib/color.js')

diff --git a/www/app/lib/color.js b/www/app/lib/color.js
new file mode 100644
index 0000000..5b1dfee
--- /dev/null
+++ b/www/app/lib/color.js
@@ -0,0 +1,65 @@
+//
+// Color.hsv().css
+//
+// RGB values are 0..255
+// HSV values are 0..1
+//
+
+function compose(value)
+  return [
+    Math.round(value * 255),
+    Math.round(value * 255),
+    Math.round(value * 255)
+  }
+}
+
+class Color {
+
+  constructor(r, g, b, a) {
+    this.r = r
+    this.g = g
+    this.b = b
+    this.a = a
+  }
+
+  //
+  // alternate hsv factory
+  //
+  static hsv(h,s,v) {
+    let out = null
+    h = h % 360;
+    s = Math.max(0, Math.min(1, s))
+    v = Math.max(0, Math.min(1, v))
+
+    if (s == 0) {
+      let grey = Math.ceil(v*255)
+      out = [grey, grey, grey]
+    }
+
+    let b = ((1 - s) * v);
+    let vb = v - b;
+    let hm = h % 60;
+    switch((h/60)|0) {
+      case 0:
+        out = compose(v, vb * h / 60 + b, b); break
+      case 1:
+        out = compose(vb * (60 - hm) / 60 + b, v, b); break
+      case 2:
+        out = compose(b, v, vb * hm / 60 + b); break
+      case 3:
+        out = compose(b, vb * (60 - hm) / 60 + b, v); break
+      case 4:
+        out = compose(vb * hm / 60 + b, b, v); break
+      case 5:
+        out = compose(v, b, vb * (60 - hm) / 60 + b); break
+    }
+
+    return new Color(...out)
+  }
+
+  css() {
+    return `rgba(${this.r}, ${this.g}, ${this.b}, ${this.a})`
+  }
+}
+
+export default Color
\ No newline at end of file
-- 
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