Split render primitives into dedicated modules

src/render/sine_wave.c

@@ -0,0 +1,27 @@
+#include "display/render/sine_wave.h"
+#include <math.h>
+
+void render_sine_wave(
+    render_ctx_t* ctx,
+    uint16_t num_points,
+    int amplitude,
+    float frequency,
+    int offset_x,
+    int offset_y,
+    float phase_shift,
+    uint16_t color
+)
+{
+    if (num_points < 2 || ctx->width == 0 || ctx->height == 0)
+        return;
+
+    float step = (2.0f * (float)M_PI * frequency) / (float)(num_points - 1u);
+    float x_step = (float)ctx->width / (float)(num_points - 1u);
+
+    for (uint16_t i = 0; i < num_points; ++i)
+    {
+        int x = offset_x + (int)((float)i * x_step);
+        int y = offset_y + (int)((float)amplitude * sinf((float)i * step + phase_shift));
+        render_pixel(ctx, x, y, color);
+    }
+}