Frame rate limiter

src/visual/ScopeCanvas.cpp

@@ -22,9 +22,10 @@ wxEND_EVENT_TABLE()
 
 ScopeCanvas::ScopeCanvas(wxWindow *parent, int *attribList) :
         wxGLCanvas(parent, wxID_ANY, attribList, wxDefaultPosition, wxDefaultSize,
-        wxFULL_REPAINT_ON_RESIZE), parent(parent) {
+        wxFULL_REPAINT_ON_RESIZE), parent(parent), frameTimer(0) {
 
     glContext = new ScopeContext(this, &wxGetApp().GetContext(this));
+    timer.start();
 }
 
 ScopeCanvas::~ScopeCanvas() {
@@ -75,5 +76,10 @@ void ScopeCanvas::OnKeyDown(wxKeyEvent& event) {
 }
 
 void ScopeCanvas::OnIdle(wxIdleEvent &event) {
-    Refresh(false);
+    timer.update();
+    frameTimer += timer.lastUpdateSeconds();
+    if (frameTimer > 1.0/30.0) {
+        Refresh(false);
+        frameTimer = 0;
+    }
 }

src/visual/ScopeCanvas.h

@@ -9,6 +9,7 @@
 #include "ScopeContext.h"
 
 #include "fftw3.h"
+#include "Timer.h"
 
 class ScopeCanvas: public wxGLCanvas {
 public:
@@ -27,6 +28,8 @@ private:
     wxWindow *parent;
 
     ScopeContext *glContext;
+    Timer timer;
+    float frameTimer;    
 // event table
 wxDECLARE_EVENT_TABLE();
 };

src/visual/SpectrumCanvas.cpp

@@ -22,7 +22,7 @@ wxEND_EVENT_TABLE()
 
 SpectrumCanvas::SpectrumCanvas(wxWindow *parent, int *attribList) :
         wxGLCanvas(parent, wxID_ANY, attribList, wxDefaultPosition, wxDefaultSize,
-        wxFULL_REPAINT_ON_RESIZE), parent(parent) {
+        wxFULL_REPAINT_ON_RESIZE), parent(parent), frameTimer(0) {
 
     int in_block_size = BUF_SIZE / 2;
     int out_block_size = FFT_SIZE;
@@ -35,6 +35,7 @@ SpectrumCanvas::SpectrumCanvas(wxWindow *parent, int *attribList) :
     fft_floor_ma = fft_floor_maa = 0.0;
 
     glContext = new SpectrumContext(this, &wxGetApp().GetContext(this));
+    timer.start();
 }
 
 SpectrumCanvas::~SpectrumCanvas() {
@@ -152,5 +153,10 @@ void SpectrumCanvas::setData(std::vector<signed char> *data) {
 }
 
 void SpectrumCanvas::OnIdle(wxIdleEvent &event) {
-    Refresh(false);
+    timer.update();
+    frameTimer += timer.lastUpdateSeconds();
+    if (frameTimer > 1.0/30.0) {
+        Refresh(false);
+        frameTimer = 0;
+    }
 }

src/visual/SpectrumCanvas.h

@@ -9,6 +9,7 @@
 #include "SpectrumContext.h"
 
 #include "fftw3.h"
+#include "Timer.h"
 
 class SpectrumCanvas: public wxGLCanvas {
 public:
@@ -36,6 +37,8 @@ private:
     std::vector<float> fft_result_maa;
 
     SpectrumContext *glContext;
+    Timer timer;
+    float frameTimer;
 // event table
 wxDECLARE_EVENT_TABLE();
 };

src/visual/WaterfallCanvas.cpp

@@ -22,7 +22,7 @@ wxEND_EVENT_TABLE()
 
 WaterfallCanvas::WaterfallCanvas(wxWindow *parent, int *attribList) :
         wxGLCanvas(parent, wxID_ANY, attribList, wxDefaultPosition, wxDefaultSize,
-        wxFULL_REPAINT_ON_RESIZE), parent(parent) {
+        wxFULL_REPAINT_ON_RESIZE), parent(parent), frameTimer(0) {
 
     int in_block_size = BUF_SIZE / 2;
     int out_block_size = FFT_SIZE;
@@ -35,6 +35,7 @@ WaterfallCanvas::WaterfallCanvas(wxWindow *parent, int *attribList) :
     fft_floor_ma = fft_floor_maa = 0.0;
 
     glContext = new WaterfallContext(this, &wxGetApp().GetContext(this));
+    timer.start();
 }
 
 WaterfallCanvas::~WaterfallCanvas() {
@@ -150,5 +151,10 @@ void WaterfallCanvas::setData(std::vector<signed char> *data) {
 }
 
 void WaterfallCanvas::OnIdle(wxIdleEvent &event) {
-    Refresh(false);
+    timer.update();
+    frameTimer += timer.lastUpdateSeconds();
+    if (frameTimer > 1.0/30.0) {
+        Refresh(false);
+        frameTimer = 0;
+    }
 }

src/visual/WaterfallCanvas.h

@@ -9,6 +9,7 @@
 #include "WaterfallContext.h"
 
 #include "fftw3.h"
+#include "Timer.h"
 
 class WaterfallCanvas: public wxGLCanvas {
 public:
@@ -36,6 +37,8 @@ private:
     std::vector<float> fft_result_maa;
 
     WaterfallContext *glContext;
+    Timer timer;
+    float frameTimer;
 // event table
 wxDECLARE_EVENT_TABLE();
 };