diff options
| -rw-r--r-- | dc/dc.c | 3 | ||||
| -rw-r--r-- | teensy/teensy_renderer.c | 25 |
2 files changed, 14 insertions, 14 deletions
@@ -37,8 +37,7 @@ void tick(void) img, ty_vec2i(SCREEN_WIDTH/2, SCREEN_HEIGHT/2), ty_vec2i(-img.width/2, -img.height/2), - TY_PI / 4 - //ty_get_time() + ty_get_time() * TY_PI / 2 ); ty_draw_text(&font, ty_vec2i(5, SCREEN_HEIGHT - 5 - 8), "hello, world!"); diff --git a/teensy/teensy_renderer.c b/teensy/teensy_renderer.c index 61710a2..ea61163 100644 --- a/teensy/teensy_renderer.c +++ b/teensy/teensy_renderer.c @@ -202,20 +202,21 @@ void ty_draw_image_rot( ty_Vec2i offset, double rot ) { - double s = sin(rot); - double c = cos(rot); - - // x1 = c*x - s*y - // y1 = s*x + c*y + double s = sin(-rot); + double c = cos(-rot); - // FIXME: the corners of the rotated image get cut off. - for (int img_y = 0; img_y < img.height; img_y++) { - for (int img_x = 0; img_x < img.width; img_x++) { - double pixel_x = img_x + offset.x; - double pixel_y = img_y + offset.y; + int blit_width = ceil(img.width * fabs(c) + img.height * fabs(s)); + int blit_height = ceil(img.width * fabs(s) + img.height * fabs(c)); - int dx = floor(pixel_x * c - pixel_y * s - offset.x); - int dy = floor(pixel_x * s + pixel_y * c - offset.y); + int startx = -blit_width / 2; + int starty = -blit_height / 2; + int endx = (blit_width + 1) / 2; + int endy = (blit_height + 1) / 2; + + for (int img_y = starty; img_y < endy; img_y++) { + for (int img_x = startx; img_x < endx; img_x++) { + int dx = floor(img_x * c - img_y * s - offset.x); + int dy = floor(img_x * s + img_y * c - offset.y); if (dx < 0 || dx >= img.width || dy < 0 || dy >= img.height) continue; |