Added private "Colouring" library

lib/Colouring/Colouring.cpp

@@ -0,0 +1,69 @@
+
+#include <Arduino.h>
+#include <stdint.h>
+#include <Adafruit_ILI9341.h>
+
+/**
+ * @brief converts rgb 8-8-8
+ * into rgb 5-6-5
+ * (bits)
+ */
+uint16_t colourFromRGB(unsigned char red, unsigned char green, unsigned char blue) {
+    return 
+        ((red >> 3) << (5+6)) +
+        ((green >> 2) << 5) +
+        (blue >> 3);
+}
+
+/**
+ * @brief converts hsv to rgb 5-6-5
+ * 
+ * @see https://piandmore.wordpress.com/2020/08/15/rgb-to-hsv-and-vice-versa/
+ */
+uint16_t colourFromHSV(int hue, float saturation, float value) {
+    float c = value*saturation;
+    float tmp = hue/60;
+    int tmp2 = tmp-2*floor((float)tmp/2);
+    float x = c*(1-abs(tmp2-1));
+    float m = value-c;
+    float r,g,b;
+    int i = floor((float)tmp);
+
+    switch (i) {
+        case 0:
+            r = c;
+            g = x;
+            b = 0;
+            break;
+        case 1:
+            r = x;
+            g = c;
+            b = 0;
+            break;
+        case 2: 
+            r = 0;
+            g = c;
+            b = x;
+            break;
+        case 3:
+            r = 0;
+            g = x;
+            b = c;
+            break;
+        case 4:
+            r = x;
+            g = 0;
+            b = c;
+            break;
+        case 5:
+            r = c;
+            g = 0;
+            b = x;
+            break;
+    }
+    return colourFromRGB(
+        constrain((int)255*(r+m),0,255),
+        constrain((int)255*(g+m),0,255),
+        constrain((int)255*(b+m),0,255)
+    );
+}

lib/Colouring/Colouring.h

@@ -0,0 +1,4 @@
+
+uint16_t colourFromRGB(unsigned char red, unsigned char green, unsigned char blue);
+
+uint16_t colourFromHSV(int hue, float saturation, float value);

lib/Colouring/library.properties

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+name=Colouring
+version=0.1.0
+author=ketrab2004
+maintainer=ketrab2004
+sentence=Functions for generating 5-6-5 colours from different inputs
+paragraph=Functions for generating 5-6-5 colours from different inputs
+category=Data Processing
+url=https://github.com/ketrab2004
+architectures=*