scope checkpoint

src/synth/Scope.cpp

@@ -0,0 +1,47 @@
+
+#include "Scope.hpp"
+
+#include <iostream>
+
+ScopeBuffer::ScopeBuffer(size_t size) : buffer_(size) {
+
+}
+
+void ScopeBuffer::push(float sample) {
+
+    size_t w = writeIndex_.fetch_add(1, std::memory_order_relaxed);
+    buffer_[w % buffer_.size()] = sample;
+}
+
+void ScopeBuffer::read(std::vector<float>& out) {
+
+    size_t w = writeIndex_.load(std::memory_order_relaxed);
+    for(size_t i = 0; i < buffer_.size(); i++) {
+        size_t idx = (w + trigger_ + i * wavelength_ / out.size()) % buffer_.size();
+        out[i] = buffer_[idx];
+    }
+
+}
+
+Scope::Scope(QQuickItem *parent) : QQuickPaintedItem(parent) {
+    setAntialiasing(true); 
+}
+
+void Scope::paint(QPainter *painter) {
+
+    //std::cout << "onPaint" << std::endl;
+
+    static float phase = 0.0f;
+    phase += 0.1f;
+    float sample = sin(phase);
+
+    QPen pen(Qt::blue, 4);
+    painter->setPen(pen);
+    painter->setRenderHint(QPainter::Antialiasing);
+
+    painter->drawRect(10, 10, width() - 20*sample, height() - 20*sample);
+    
+    painter->setPen(QPen(Qt::red, 2));
+    painter->drawLine(0, 0, width(), height());
+
+}