refactoring hell :3

src/trail_customization/rainbow_trail.cpp

@@ -2,69 +2,33 @@
 
 #include <cmath>
 
-void RainbowTrail::hsv_to_rgb(float &fR, float &fG, float &fB, float &fH, float &fS, float &fV) {
-    float fC = fV * fS; // Chroma
-    float fHPrime = fmod(fH / 60.0, 6);
-    float fX = fC * (1 - fabs(fmod(fHPrime, 2) - 1));
-    float fM = fV - fC;
-
-    int hue_segment = static_cast<int>(fHPrime);
-    switch (hue_segment) {
-        case 0:
-            fR = fC;
-            fG = fX;
-            fB = 0;
-            break;
-        case 1:
-            fR = fX;
-            fG = fC;
-            fB = 0;
-            break;
-        case 2:
-            fR = 0;
-            fG = fC;
-            fB = fX;
-            break;
-        case 3:
-            fR = 0;
-            fG = fX;
-            fB = fC;
-            break;
-        case 4:
-            fR = fX;
-            fG = 0;
-            fB = fC;
-            break;
-        case 5:
-            fR = fC;
-            fG = 0;
-            fB = fX;
-            break;
-        default:
-            fR = 0;
-            fG = 0;
-            fB = 0;
-            break;
-    }
-
-    fR += fM;
-    fG += fM;
-    fB += fM;
+// Table-based HSV to RGB conversion (precalculate for efficiency)  
+const float kHueSegmentValues[6][3] = {
+    {1, 0, 0}, {1, 1, 0}, {0, 1, 0}, {0, 1, 1}, {0, 0, 1}, {1, 0, 1}
+};
+
+void RainbowTrail::hsv_to_rgb(float &fR, float &fG, float &fB, float fH, float fS, float fV) {
+    float fC = fV * fS;
+    int hIndex = static_cast<int>(fmod(fH / 60.0, 6));
+    const float* rgb = kHueSegmentValues[hIndex];
+
+    fR = rgb[0] * fC + fV - fC; 
+    fG = rgb[1] * fC + fV - fC;
+    fB = rgb[2] * fC + fV - fC;
 }
 
-float RainbowTrail::g = 0;
+float RainbowTrail::g = 0; // Assuming 'g' is used for animation
 
 cocos2d::_ccColor3B RainbowTrail::get_rainbow(float offset, float saturation) {
-    float R, G, B;
-
     float hue = fmod(g + offset, 360);
     float sat = saturation / 100.0;
-    float vc = 1;
-    hsv_to_rgb(R, G, B, hue, sat, vc);
 
-    cocos2d::_ccColor3B out;
-    out.r = R * 255;
-    out.g = G * 255;
-    out.b = B * 255;
-    return out;
+    float R, G, B;
+    hsv_to_rgb(R, G, B, hue, sat, 1); // Constant brightness
+
+    return cocos2d::_ccColor3B{ 
+        static_cast<uint8_t>(R * 255),
+        static_cast<uint8_t>(G * 255),
+        static_cast<uint8_t>(B * 255)
+    };
 }