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| author | kdx <kikoodx@paranoici.org> | 2023-03-17 11:56:08 +0100 |
|---|---|---|
| committer | kdx <kikoodx@paranoici.org> | 2023-03-17 12:01:20 +0100 |
| commit | b6e8281daa60e60e2ae81569b5547f1e3ac3a72b (patch) | |
| tree | d671bbbfc090c9824ba21e80a2fff33e3df4d1f6 | |
| parent | 9b549158ef22cc845867ac44c4d333b05fa94a44 (diff) | |
| download | hyperultra-b6e8281daa60e60e2ae81569b5547f1e3ac3a72b.tar.gz | |
rotating squares
| -rw-r--r-- | src/background.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/src/background.c b/src/background.c index c33492b..623f5e0 100644 --- a/src/background.c +++ b/src/background.c @@ -3,8 +3,6 @@ #include <math.h> static long tick = 0; -static const int center_x = DISPLAY_WIDTH / 2; -static const int center_y = DISPLAY_HEIGHT / 2; static void rotate(double *x, double *y, double angle) @@ -14,7 +12,7 @@ rotate(double *x, double *y, double angle) const double ox = *x; const double oy = *y; - *x = ox * c - ox * s; + *x = ox * c - oy * s; *y = ox * s + oy * c; } @@ -25,18 +23,18 @@ draw_square(int size, double angle) size / 2.0, size / 2.0, -size / 2.0, - -size / 2.0 + -size / 2.0, }; double y[4] = { -size / 2.0, size / 2.0, size / 2.0, - -size / 2.0 + -size / 2.0, }; for (int i = 0; i < 4; i++) { rotate(&x[i], &y[i], angle); - x[i] += center_x; - y[i] += center_y; + x[i] += DISPLAY_WIDTH / 2.0; + y[i] += DISPLAY_HEIGHT / 2.0; } LZY_DrawLine(x[0], y[0], x[1], y[1]); LZY_DrawLine(x[1], y[1], x[2], y[2]); @@ -49,5 +47,7 @@ background_draw(void) { tick += 1; LZY_DrawSetColor(0, 0, 0); - draw_square(64, (double)tick / 10); + draw_square(64 * sin((double)tick / 50), (double)tick / 40); + draw_square(64 * sin((double)tick / 40), (double)tick / 30); + draw_square(64 * sin((double)tick / 30), (double)tick / 20); } |