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Angle calculation for WIP Lightning effect

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This commit is contained in:
Bill Kendrick 2021-09-26 23:34:49 -07:00
parent 2bd9b74dd6
commit 4965cc95f1
1 changed files with 18 additions and 10 deletions
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28
magic/src/lightning.c
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@ -9,6 +9,7 @@
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include <libintl.h> #include <libintl.h>
#include <math.h>
#include "tp_magic_api.h" #include "tp_magic_api.h"
#include "SDL_image.h" #include "SDL_image.h"
@ -22,7 +23,6 @@ int sx, sy;
void lightning_drag(magic_api * api, int which, SDL_Surface * canvas, void lightning_drag(magic_api * api, int which, SDL_Surface * canvas,
SDL_Surface * snapshot, int ox, int oy, int x, int y, SDL_Rect * update_rect); SDL_Surface * snapshot, int ox, int oy, int x, int y, SDL_Rect * update_rect);
void lightning_line_callback_drag(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y); void lightning_line_callback_drag(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y);
void lightning_line_callback_release(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y);
Uint32 lightning_api_version(void) Uint32 lightning_api_version(void)
@ -120,6 +120,8 @@ void
lightning_release(magic_api * api, int which, lightning_release(magic_api * api, int which,
SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect) SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect)
{ {
float a, b, len, angle;
/* FIXME: This could be made more efficient /* FIXME: This could be made more efficient
(only blit and update between (sx,sy) and (x,y), though (only blit and update between (sx,sy) and (x,y), though
it should also cover the area extending to (ox,oy), it should also cover the area extending to (ox,oy),
@ -131,9 +133,23 @@ lightning_release(magic_api * api, int which,
SDL_BlitSurface(snapshot, update_rect, canvas, update_rect); SDL_BlitSurface(snapshot, update_rect, canvas, update_rect);
api->line((void *)api, which, canvas, snapshot, sx, sy, x, y, 1, lightning_line_callback_release);
api->stopsound(); api->stopsound();
api->playsound(snd_effect, (x * 255) / canvas->w, 255); api->playsound(snd_effect, (x * 255) / canvas->w, 255);
a = (x - sx);
b = (y - sy);
len = sqrt((a * a) + (b * b));
angle = acos((x - sx) / len);
if (y < sy)
angle = -angle;
#ifdef DEBUG
printf("(%d,%d)->(%d,%d) => a = %.2f, b = %.2f, c (len) = %.2f; angle = %.2f degrees\n",
sx, sy, x, y, a, b, len, (angle * 180.0) / M_PI);
#endif
// FIXME: Do something
} }
void lightning_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b) void lightning_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b)
@ -151,14 +167,6 @@ void lightning_line_callback_drag(void *ptr, int which, SDL_Surface * canvas, SD
api->xorpixel(canvas, x, y); api->xorpixel(canvas, x, y);
} }
void lightning_line_callback_release(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y)
{
magic_api *api = (magic_api *) ptr;
// FIXME
api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, lightning_r, lightning_g, lightning_b));
}
void lightning_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas) void lightning_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas)
{ {
} }