shithub: m8c

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fx_cube.c: do not use cumulative scaling for coordinates

--- a/src/fx_cube.c

+++ b/src/fx_cube.c

@@ -117,17 +117,17 @@

     SDL_SetRenderDrawColor(fx_renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);

     SDL_RenderClear(fx_renderer);

-    const Uint64 seconds = SDL_GetTicks() / 1000;

-    const float scale_factor = 1 + SDL_sinf((float)seconds) * (float)0.005;

+    const Uint64 ms = SDL_GetTicks();

+    const float t = (float)ms / 1000.0f;

+    const float pulse = 1.0f + 0.25f * SDL_sinf(t);

-    scale(scale_factor, scale_factor, scale_factor);

     rotate_cube(M_PI / 180, M_PI / 270);

     for (int i = 0; i < 12; i++) {

       const float *p1 = nodes[edges[i][0]];

       const float *p2 = nodes[edges[i][1]];

-      points[points_counter++] = (SDL_FPoint){p1[0] + center_x, nodes[edges[i][0]][1] + center_y};

-      points[points_counter++] = (SDL_FPoint){p2[0] + center_x, p2[1] + center_y};

+      points[points_counter++] = (SDL_FPoint){p1[0] * pulse + center_x, p1[1] * pulse + center_y};

+      points[points_counter++] = (SDL_FPoint){p2[0] * pulse + center_x, p2[1] * pulse + center_y};

     }

     SDL_RenderTexture(fx_renderer, texture_text, NULL, NULL);

-- 

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