diff options
Diffstat (limited to 'src/rotrect.c')
| -rw-r--r-- | src/rotrect.c | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/src/rotrect.c b/src/rotrect.c index 5abae13..6721d10 100644 --- a/src/rotrect.c +++ b/src/rotrect.c @@ -15,8 +15,8 @@ rotate(double *x, double *y, double angle) *y = ox * s + oy * c; } -void -rotrect(double x, double y, double width, double height, double angle) +Rect +rotrect_create(double width, double height, double angle) { double xs[4] = { width / 2.0, @@ -30,14 +30,30 @@ rotrect(double x, double y, double width, double height, double angle) height / 2.0, -height / 2.0, }; - for (int i = 0; i < 4; i++) { + for (int i = 0; i < 4; i++) rotate(&xs[i], &ys[i], angle); - xs[i] = round(xs[i] + x); - ys[i] = round(ys[i] + y); - } + return (Rect){ xs[0], ys[0], xs[1], ys[1], xs[2], ys[2], xs[3], ys[3] }; +} + +void +rotrect_draw(Rect rect, double x, double y) +{ + const int xs[4] = { + round(rect.x0 + x), round(rect.x1) + x, + round(rect.x2 + x), round(rect.x3) + x + }; + const int ys[4] = { + round(rect.y0 + y), round(rect.y1) + y, + round(rect.y2 + y), round(rect.y3) + y, + }; LZY_DrawLine(xs[0], ys[0], xs[1], ys[1]); LZY_DrawLine(xs[1], ys[1], xs[2], ys[2]); LZY_DrawLine(xs[2], ys[2], xs[3], ys[3]); LZY_DrawLine(xs[3], ys[3], xs[0], ys[0]); } +void +rotrect(double x, double y, double width, double height, double angle) +{ + rotrect_draw(rotrect_create(width, height, angle), x, y); +} |