Basic title animtion for VCO

src/droplets/droplet.cpp

@@ -22,3 +22,15 @@ void Droplet::UpdateState(DropletState m_state) {
     screen_min = SSD1309_WIDTH / 2;
   }
 }
+
+void Droplet::AnimationInc() {
+  if (count == animation_rate) {
+    animation_count++;
+    count = 0;
+  }
+  count++;
+}
+
+void Droplet::SetAnimationRate(int rate) {
+  animation_rate = rate;
+}

src/droplets/droplet.h

@@ -14,6 +14,9 @@ using namespace daisy;
 enum class DropletState {kFull, kLeft, kRight};
 
 class Droplet {
+private:
+  unsigned int count = 0;
+  unsigned int animation_rate = 1;
 public:
   DaisyPatch* patch;
   DropletState state;
@@ -22,7 +25,7 @@ public:
   virtual void Control()=0;
   virtual void Process(float**, float**, size_t)=0;
   virtual void Draw()=0;
-  const int kTitleHeight = 8;
+  const int kTitleHeight = 7;
   int screen_min;
   int screen_max;
   size_t chn_min = 0;
@@ -30,6 +33,9 @@ public:
   void DrawName(daisy::DaisyPatch*,
 		std::string);
   void UpdateState(DropletState);
+  unsigned int animation_count = 0;
+  void AnimationInc();
+  void SetAnimationRate(int);
 };
 
 #endif // CASCADE_DROPLETS_DROPLET_H_

src/droplets/vco_droplet.cpp

@@ -6,6 +6,7 @@ VCODroplet::VCODroplet(DaisyPatch* m_patch,
   Droplet(m_patch,
 	  m_state){
   int num_waves = Oscillator::WAVE_LAST;
+  SetAnimationRate(10);
   osc.Init(sample_rate);
   freqctrl.Init(patch->controls[patch->CTRL_1], 10.0,
 		110.0f, Parameter::LINEAR);
@@ -45,9 +46,31 @@ void VCODroplet::Process(float** in, float** out, size_t size) {
 }
 
 void VCODroplet::Draw() {
-  DrawName(patch, "VCO");
+  int sine_width = 20;
+  bool sine_wave[sine_width][Droplet::kTitleHeight];
+
+  // Set blank pattern
+  for (int h = 0; h < kTitleHeight; h++) {
+    for (int w = screen_min; w < screen_max; w++) {
+      sine_wave[w][h] = false;
+    }
+  }
+
+  for (int i = 0; i < sine_width; i++) {
+    int pixel = (int) round(std::sin(2*pi*((double)(i + animation_count%sine_width)/sine_width)) * (kTitleHeight/2) + kTitleHeight/2);
+  sine_wave[i][pixel] = true;
+  }
+
+  for (int h = 0; h < kTitleHeight; h++) {
+    for (int w = screen_min; w < screen_max; w++) {
+      patch->display.DrawPixel(w, h, sine_wave[w%sine_width][h%kTitleHeight]);
+    }
+  }
+  
   WriteString(*patch, 0, 54, Font_6x8,
 	      WaveToString(wavectrl.Process()));
+  DrawName(patch, "VCO");
+  AnimationInc();
 }
 
 std::string VCODroplet::WaveToString(uint8_t wf) {

src/droplets/vco_droplet.h

@@ -3,6 +3,8 @@
 #ifndef CASCADE_DROPLETS_VCO_DROPLET_H_
 #define CASCADE_DROPLETS_VCO_DROPLET_H_
 
+#include <cmath>
+
 #include "daisysp.h"
 #include "daisy_patch.h"
 
@@ -17,6 +19,7 @@ private:
   Oscillator osc;
   Parameter freqctrl, wavectrl, ampctrl, finectrl;
   std::string WaveToString(uint8_t);
+  const double pi = std::acos(-1);
 public:
   VCODroplet(DaisyPatch*, DropletState, float);
   void Control();