add neopixel example

lib/NeoPattern/NeoPattern_api_modes.cpp

@@ -0,0 +1,66 @@
+#ifndef __NEOPATTERN_API_MODES__
+#define __NEOPATTERN_API_MODES__
+
+#include "NeoPattern.cpp"
+
+enum PIXEL_MODE { PIXELS_OFF = 0, COLOR_WHEEL_MODE = 1, COLOR_MODE = 2, PATTERN_MODE = 3};
+typedef void (*PIXEL_FP)(NeoPattern*, const char *);
+
+/*
+    Array of function pointers to be used as lookup table using the int values of PIXEL_MODE.
+    TODO header file + separate functions instead of lambdas
+*/
+const PIXEL_FP PIXEL_FNCS[] = {
+    /* 
+        PIXESL_OFF 
+        Sets all pixels to black.
+    */
+    [](NeoPattern* pixels, const char *color){        
+        pixels->clear();
+        pixels->ColorSet(0);
+    },
+    /* 
+        COLOR_WHEEL_MODE 
+        Input: integer color from 0 to 155
+        Uses the color wheel to set a color.
+        If given integer is <= 1, set the color to black.
+        By using this function, Color1 and Color2 is set on the pixels; 
+            Color1 = new color, Color2 = last color.
+    */
+    [](NeoPattern* pixels, const char *color){
+        int c1 = atoi(color);
+        int c2 = pixels->Color1;
+        pixels->Color1 = c1;
+        pixels->Color2 = c2;
+        pixels->ActivePattern = NONE;
+        if(c1 <= 1) {
+            pixels->ColorSet(0); 
+            return;
+        }
+        pixels->ColorSet(pixels->Wheel(c1));
+    },
+    /* 
+        COLOR_MODE 
+        Input: rgb hex color without #
+        parses the hex string to r,g,b and sets all pixels accordingly
+    */
+    [](NeoPattern* pixels, const char *color){
+        int r, g, b;
+        sscanf(color, "%02x%02x%02x", &r, &g, &b);
+        pixels->ColorSet(pixels->Color(r,g,b));
+    },
+    /* 
+        PATTERN_MODE 
+        Input: id of the pattern
+        Sets the active pattern on the strip.
+        As every pattern has another API, all fields need to be set before, for example by using COLOR_WHEEL_MODE.
+    */
+    [](NeoPattern* pixels, const char *id){
+        pattern p = (pattern)atoi(id);
+        pixels->Interval = 50;
+        pixels->TotalSteps = pixels->numPixels();
+        pixels->ActivePattern = p;
+    }
+};
+
+#endif