initial commit

include/colors.h

@@ -0,0 +1,152 @@
+typedef struct {
+    double r;       // a fraction between 0 and 1
+    double g;       // a fraction between 0 and 1
+    double b;       // a fraction between 0 and 1
+} rgb;
+
+typedef struct {
+    double h;       // angle in degrees
+    double s;       // a fraction between 0 and 1
+    double v;       // a fraction between 0 and 1
+} hsv;
+
+static rgb   int2rgb(uint32_t in);
+static hsv   rgb2hsv(rgb in);
+static rgb   hsv2rgb(hsv in);
+
+rgb int2rgb(uint32_t in)
+{
+    rgb out;
+    out.r = (in >> 16) & 255;
+    out.g = (in >> 8) & 255;
+    out.b = in & 255;
+    return out;
+}
+
+hsv rgb2hsv(rgb in)
+{
+    hsv out;
+    double min, max, delta;
+
+    min = in.r < in.g ? in.r : in.g;
+    min = min  < in.b ? min  : in.b;
+
+    max = in.r > in.g ? in.r : in.g;
+    max = max  > in.b ? max  : in.b;
+
+    out.v = max;
+    delta = max - min;
+
+    if (delta < 0.00001)
+    {
+        out.s = 0;
+        out.h = 0; 
+        return out;
+    }
+    if(max > 0.0)
+    {
+        out.s = (delta / max);
+    } 
+    else 
+    {
+        out.s = 0.0;
+        out.h = 0;
+        return out;
+    }
+
+    if(in.r >= max)
+        out.h = ( in.g - in.b ) / delta;
+    else if(in.g >= max)
+        out.h = 2.0 + ( in.b - in.r ) / delta;
+    else
+        out.h = 4.0 + ( in.r - in.g ) / delta;
+
+    out.h *= 60.0;
+
+    if(out.h < 0.0)
+        out.h += 360.0;
+
+    return out;
+}
+
+
+rgb hsv2rgb(hsv in)
+{
+    double hh, p, q, t, ff;
+    long i;
+    rgb out;
+
+    if(in.s <= 0.0) 
+    {
+        out.r = in.v;
+        out.g = in.v;
+        out.b = in.v;
+        return out;
+    }
+    hh = in.h;
+    
+    if(hh >= 360.0) 
+        hh = 0.0;
+    
+    hh /= 60.0;
+    i = (long)hh;
+    ff = hh - i;
+    p = in.v * (1.0 - in.s);
+    q = in.v * (1.0 - (in.s * ff));
+    t = in.v * (1.0 - (in.s * (1.0 - ff)));
+
+    switch(i)
+    {
+        case 0:
+            out.r = in.v;
+            out.g = t;
+            out.b = p;
+            break;
+        case 1:
+            out.r = q;
+            out.g = in.v;
+            out.b = p;
+            break;
+        case 2:
+            out.r = p;
+            out.g = in.v;
+            out.b = t;
+            break;
+
+        case 3:
+            out.r = p;
+            out.g = q;
+            out.b = in.v;
+            break;
+        case 4:
+            out.r = t;
+            out.g = p;
+            out.b = in.v;
+            break;
+        case 5:
+        default:
+            out.r = in.v;
+            out.g = p;
+            out.b = q;
+            break;
+    }
+    return out;     
+}
+
+rgb gradient(rgb start, rgb end, double ratio)
+{
+  if(ratio < 0)
+    ratio = 0;
+  if(ratio > 1)
+    ratio = 1;
+
+  auto start_hsv = rgb2hsv(start);
+  auto end_hsv = rgb2hsv(end);
+
+  hsv result;
+  result.h = start_hsv.h + ratio * (end_hsv.h - start_hsv.h);
+  result.s = start_hsv.s + ratio * (end_hsv.s - start_hsv.s);
+  result.v = start_hsv.v + ratio * (end_hsv.v - start_hsv.v);
+
+  return hsv2rgb(result);
+}

include/config.h

@@ -0,0 +1,22 @@
+#include <stdint.h>
+
+#define SSID     "Galaxy"
+#define PASSWORD "changeme"
+
+#define NTP_SERVER "0.be.pool.ntp.org"
+
+#define PIN        D4
+#define NUMPIXELS  20
+
+const uint32_t PALETTES[] = 
+{
+    0xc43f1a, 0x75266f, 0x43aba3,
+    0x542424, 0xe1b343, 0xefc988,
+    0xAA5E47, 0xDDA254, 0x4D7A5C,
+    0x034F4D, 0x53BD99, 0x1A8263,
+    0xfb9568, 0x729575, 0x1eeac5,
+    0x2F66C4, 0xF04F4F, 0x1EBA8B,
+    0x428529, 0xFFCBB5, 0x767FA6
+};
+
+const int PALETTE_COUNT = sizeof(PALETTES) / sizeof(uint32_t) / 3;