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Render sine wave as continuous polyline

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Stanislav N Mikhailov
2026-04-05 00:37:29 +03:00
parent 763ba34110
commit 822890d466
1 changed files with 9 additions and 2 deletions
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src/render/sine_wave.c
+9 -2
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@@ -1,4 +1,5 @@
#include "display/render/sine_wave.h" #include "display/render/sine_wave.h"
#include "display/render/line.h"
#include <math.h> #include <math.h>
void render_sine_wave( void render_sine_wave(
@@ -18,10 +19,16 @@ void render_sine_wave(
float step = (2.0f * (float)M_PI * frequency) / (float)(num_points - 1u); float step = (2.0f * (float)M_PI * frequency) / (float)(num_points - 1u);
float x_step = (float)ctx->width / (float)(num_points - 1u); float x_step = (float)ctx->width / (float)(num_points - 1u);
for (uint16_t i = 0; i < num_points; ++i) int prev_x = offset_x;
int prev_y = offset_y + (int)((float)amplitude * sinf(phase_shift));
for (uint16_t i = 1; i < num_points; ++i)
{ {
int x = offset_x + (int)((float)i * x_step); int x = offset_x + (int)((float)i * x_step);
int y = offset_y + (int)((float)amplitude * sinf((float)i * step + phase_shift)); int y = offset_y + (int)((float)amplitude * sinf((float)i * step + phase_shift));
render_pixel(ctx, x, y, color);
render_line(ctx, prev_x, prev_y, x, y, color);
prev_x = x;
prev_y = y;
} }
} }