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"Rotate" magic - add indicator lines during active use

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This commit is contained in:
Bill Kendrick 2024-09-25 00:04:54 -07:00
parent 4ee781c6de
commit 9d169fec58
1 changed files with 25 additions and 2 deletions
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27
magic/src/rotate.c
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@ -68,6 +68,7 @@ Uint8 rotate_default_size(magic_api * api, int which, int mode);
void rotate_set_size(magic_api * api, int which, int mode, SDL_Surface * canvas, SDL_Surface * last, Uint8 size,
SDL_Rect * update_rect);
float do_rotate(SDL_Surface * canvas, int x, int y, int smoothing_flag);
void rotate_xorline_callback(void *pointer, int tool, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y);
Uint32 rotate_api_version(void)
@ -157,12 +158,34 @@ float do_rotate(SDL_Surface * canvas, int x, int y, int smoothing_flag)
return angle_rad;
}
void rotate_xorline_callback(void *pointer ATTRIBUTE_UNUSED, int tool ATTRIBUTE_UNUSED,
SDL_Surface * canvas, SDL_Surface * snapshot ATTRIBUTE_UNUSED, int x, int y)
{
magic_api *api = (magic_api *) pointer;
api->xorpixel(canvas, x, y);
}
void rotate_drag(magic_api * api, int which ATTRIBUTE_UNUSED, SDL_Surface * canvas,
SDL_Surface * last ATTRIBUTE_UNUSED, int ox ATTRIBUTE_UNUSED, int oy ATTRIBUTE_UNUSED,
SDL_Surface * last, int ox ATTRIBUTE_UNUSED, int oy ATTRIBUTE_UNUSED,
int x, int y, SDL_Rect * update_rect)
{
float ang;
int xx, yy;
/* Rotate interactively based on the X/Y position of the mouse */
do_rotate(canvas, x, y, SMOOTHING_OFF);
ang = do_rotate(canvas, x, y, SMOOTHING_OFF);
/* Draw indicator lines */
xx = (canvas->w / 2) + ((int) (cos(ang) * 100));
yy = (canvas->h / 2) - ((int) (sin(ang) * 100));
api->line((void *)api, which, canvas, last, canvas->w / 2, canvas->h / 2, xx, yy, 1,
rotate_xorline_callback);
xx = (canvas->w / 2) + ((int) (cos(ang + (M_PI / 2)) * 200));
yy = (canvas->h / 2) - ((int) (sin(ang + (M_PI / 2)) * 200));
api->line((void *)api, which, canvas, last, canvas->w / 2, canvas->h / 2, xx, yy, 1,
rotate_xorline_callback);
update_rect->x = 0;
update_rect->y = 0;