Refactoring and cleanup

1 files changed, 86 insertions, 0 deletions

diff --git a/gui.cpp b/gui.cpp
new file mode 100644
index 0000000..5a8a231
--- /dev/null
+++ b/gui.cpp
@@ -0,0 +1,86 @@
+#include "gui.h"
+
+#include <SDL2/SDL.h>
+#include "sequence.h"
+
+void Knob::Draw(SDL_Renderer* renderer)
+{
+	constexpr int Radius = 25;
+	SDL_Rect rect = { m_x, m_y, Radius, Radius };
+	SDL_RenderDrawRect(renderer, &rect);
+
+	SDL_RenderDrawLine(renderer, m_x, m_y + (*value * valueScaling), m_x + Radius, m_y + (*value * valueScaling));
+}
+
+bool Knob::InBounds(int x, int y)
+{
+	constexpr int Radius = 25;
+	SDL_Rect rect = { m_x, m_y, Radius, Radius };
+	SDL_Point point = { x, y };
+
+	return SDL_PointInRect(&point, &rect);
+}
+
+GUI::GUI(Sequence& seq)
+{
+	int i = 0;
+	for (auto& step : seq.steps) {
+		++i;
+		m_knobs.emplace_back(i * 30 + 10, 120, &step.carrierFreq, 0.1f);
+		m_knobs.emplace_back(i * 30 + 10, 180, &step.modFreq);
+		m_knobs.emplace_back(i * 30 + 10, 220, &step.modDepth, 3.0f);
+	}
+}
+
+void GUI::OnMouseDown(int x, int y)
+{
+	for (Knob& knob : m_knobs) {
+		if (knob.InBounds(x, y)) {
+			m_activeKnob = &knob;
+			m_dragStart = y;
+			return;
+		}
+	}
+}
+
+void GUI::OnMouseUp()
+{
+	m_activeKnob = nullptr;
+	m_dragStart = 0;
+}
+
+void GUI::OnMouseMove(int x, int y)
+{
+	if (m_activeKnob) {
+		*m_activeKnob->value -= (m_dragStart - y) / m_activeKnob->valueScaling;
+		m_dragStart = y;
+
+		if (*m_activeKnob->value < 0) 
+			*m_activeKnob->value = 0;
+	}
+}
+
+void GUI::Repaint(SDL_Renderer* renderer, int currentStep)
+{
+	SDL_Rect rect = {
+		(640 - 8 * (32 + 8)) / 2,
+		(320 - 32) / 2,
+		32,
+		32
+	};
+
+	for (int i = 0; i < 8; i++) {
+		SDL_SetRenderDrawColor(renderer, 128, i * (255 / 8), 255, 255);
+
+		if (i == currentStep)
+			SDL_RenderFillRect(renderer, &rect);
+		else
+			SDL_RenderDrawRect(renderer, &rect);
+
+		rect.x += rect.w + 8;
+	}
+
+	for (Knob& knob : m_knobs) {
+		knob.Draw(renderer);
+	}
+}
\ No newline at end of file