Add random and rainbow variant presets

Changed refresh rate to 4 Hz to better visualize animations

main/main.cpp

@@ -209,7 +209,7 @@ extern "C" void app_main(void) {
         } else {
             ESP_LOGI(TAG, "Starting animation");
 
-            int period_us = 1000000;
+            int period_us = 1000000 / 4;
             int64_t target_us = time_us();
             while (true) {
                 int64_t delay_us = target_us - time_us();

main/presets.cpp

@@ -18,6 +18,24 @@ GRADIENT(rainbow, 6, {
     Colors::purple,
 });
 
+GRADIENT(dark_rainbow, 6, {
+    Colors::dark_red,
+    Colors::dark_orange,
+    Colors::dark_yellow,
+    Colors::dark_green,
+    Colors::dark_blue,
+    Colors::dark_purple,
+});
+
+GRADIENT(pale_rainbow, 6, {
+    Colors::pale_red,
+    Colors::pale_orange,
+    Colors::pale_yellow,
+    Colors::pale_green,
+    Colors::pale_blue,
+    Colors::pale_purple,
+});
+
 GRADIENT(peacock, 4, {
     Colors::teal,
     Colors::black,
@@ -25,6 +43,31 @@ GRADIENT(peacock, 4, {
     Colors::blue,
 });
 
+// Guaranteed to be random.  https://xkcd.com/221/
+GRADIENT(random, 20, {
+    {223, 241, 107},
+    Colors::black,
+    {34, 170, 82},
+    Colors::black,
+    {98, 222, 224},
+    Colors::black,
+    {230, 114, 8},
+    Colors::black,
+    {226, 215, 213},
+    Colors::black,
+    {94, 187, 179},
+    Colors::black,
+    {76, 185, 214},
+    Colors::black,
+    {40, 115, 111},
+    Colors::black,
+    {230, 234, 120},
+    Colors::black,
+    {157, 128, 68},
+    Colors::black,
+});
+
+
 } // Gradients
 
 
@@ -40,8 +83,18 @@ namespace Patterns {
     }
 
 PATTERN(rainbow);
+PATTERN(dark_rainbow);
+PATTERN(pale_rainbow);
 PATTERN(peacock);
 
+static const Pattern random = {
+    .cycle_length = 20,
+    .cycle_time_ms = 10000,
+    .reverse = false,
+    .march = true,
+    .gradient = Gradients::random
+};
+
 } // Patterns
 
 
@@ -51,7 +104,10 @@ namespace Presets {
 
 const std::map <std::string, const Pattern*> map = {
     PRESET(rainbow),
+    PRESET(dark_rainbow),
+    PRESET(pale_rainbow),
     PRESET(peacock),
+    PRESET(random),
 };
 
 const Pattern* find(const std::string &name) {