Sequencer step and reset

src/droplets/sequencer_droplet.cpp

@@ -9,7 +9,14 @@ SequencerDroplet::SequencerDroplet(DaisyPatch* m_patch,
 
 SequencerDroplet::~SequencerDroplet() {}
 
-void SequencerDroplet::Control() {}
+void SequencerDroplet::Control() {
+  if(Patch()->gate_input[0].Trig()) {
+    Step();
+  }
+  if(Patch()->gate_input[1].Trig()) {
+    Reset();
+  }
+}
 
 void SequencerDroplet::Process(AudioHandle::InputBuffer in,
 			      AudioHandle::OutputBuffer out,
@@ -17,9 +24,18 @@ void SequencerDroplet::Process(AudioHandle::InputBuffer in,
 }
 
 void SequencerDroplet::Draw() {
+  WriteString(Patch(), 0, 10, std::to_string(step));
   DrawName("Sequencer");
 }
 
 void SequencerDroplet::UpdateStateCallback() {}
 
 void SequencerDroplet::SetControls() {}
+
+void SequencerDroplet::Step() {
+  step = (step + 1) % MAX_SEQUENCE_LENGTH;
+}
+
+void SequencerDroplet::Reset() {
+  step = 0;
+}

src/droplets/sequencer_droplet.h

@@ -9,11 +9,22 @@
 #include "droplet.h"
 #include "../util.h"
 
+#define MAX_SEQUENCE_LENGTH 32
+
 class SequencerDroplet: public Droplet {
 private:
-  int sequence_length = 32;
   int step = 0;
-  float swquence[32] = { 0.0f };
+  float swquence[MAX_SEQUENCE_LENGTH] = { 0.0f };
+
+  /*
+   * Set the sequencer to the next step.
+   */
+  void Step();
+
+  /*
+   * Reset the sequencers to the first step of the sequence.
+   */
+  void Reset();
 public:
   /*
    * Constructor for a droplet.

src/util.cpp

@@ -29,6 +29,13 @@ void WriteString(DaisyPatch* patch,
   WriteString(patch, x, y, font, text, true);
 }
 
+void WriteString(DaisyPatch* patch,
+		 int x,
+		 int y,
+		 std::string text) {
+  WriteString(patch, x, y, Font_6x8, text, true);
+}
+
 void WriteCenteredString(DaisyPatch* patch,
 			 int x,
 			 int y,

src/util.h

@@ -63,6 +63,20 @@ void WriteString(DaisyPatch* patch,
 		 FontDef font,
 		 std::string text);
 
+/*
+ * Draws text on screen flushed left. 
+ *
+ * @param patch daisy patch board
+ * @param x start of text x coordinate 
+ * @param y start of text y coordinate
+ * @param text text to be written
+ */
+void WriteString(DaisyPatch* patch,
+		 int x,
+		 int y,
+		 std::string text);
+
+
 /*
  * Draws text on screen centered. 
  *