tuxpaint-pencil-sharpener/magic/src/confetti.c

/* Last updated 2021-09-21 */

#include <time.h>               //For time()

#include "tp_magic_api.h"
#include "SDL_image.h"
#include "SDL_mixer.h"

#define CONFETTI_BRUSH_SIZE 8   //radius of each confetti circle
#define CONFETTI_QUANTITY 3     //how many circles will be created every click?

struct confetti_rgb
{
  Uint8 r, g, b;
};

struct confetti_rgb confetti_colors;    //storage for colors, just for having everything in one place

Mix_Chunk *confetti_snd;

/* Local function prototypes: */
Uint32 confetti_api_version(void);
void confetti_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
int confetti_init(magic_api * api);
int confetti_get_tool_count(magic_api * api);
SDL_Surface *confetti_get_icon(magic_api * api, int which);
char *confetti_get_name(magic_api * api, int which);
int confetti_get_group(magic_api * api, int which);
char *confetti_get_description(magic_api * api, int which, int mode);
int confetti_requires_colors(magic_api * api, int which);
void confetti_release(magic_api * api, int which,
                      SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect);
void confetti_shutdown(magic_api * api);
inline char confetti_get_greater(const char what1, const char what2);
inline char confetti_get_lesser(const char what1, const char what2);
Uint32 confetti_get_new_color(void *ptr, SDL_Surface * canvas);
void confetti_click(magic_api * api, int which, int mode,
                    SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
void confetti_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
void confetti_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
int confetti_modes(magic_api * api, int which);

//                              Housekeeping functions

void confetti_drag(magic_api * api, int which, SDL_Surface * canvas,
                   SDL_Surface * snapshot, int ox, int oy, int x, int y, SDL_Rect * update_rect);

Uint32 confetti_api_version(void)
{
  return (TP_MAGIC_API_VERSION);
}

void confetti_set_color(magic_api * api ATTRIBUTE_UNUSED, Uint8 r, Uint8 g, Uint8 b)    //get the colors from API and store it in structure
{
  confetti_colors.r = r;
  confetti_colors.g = g;
  confetti_colors.b = b;
}

int confetti_init(magic_api * api)
{
  char fname[1024];

  snprintf(fname, sizeof(fname), "%s/sounds/magic/confetti.ogg", api->data_directory);
  confetti_snd = Mix_LoadWAV(fname);

  return (1);
}

int confetti_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
{
  return 1;
}

SDL_Surface *confetti_get_icon(magic_api * api, int which ATTRIBUTE_UNUSED)
{
  char fname[1024];

  snprintf(fname, sizeof(fname), "%s/images/magic/confetti.png", api->data_directory);

  return (IMG_Load(fname));
}

char *confetti_get_name(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return strdup(gettext_noop("Confetti"));
}

int confetti_get_group(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return MAGIC_TYPE_PAINTING;
}

char *confetti_get_description(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
{
  return strdup(gettext_noop("Click to throw confetti!"));
}

int confetti_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return 1;
}

void confetti_release(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
                      SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * snapshot ATTRIBUTE_UNUSED,
                      int x ATTRIBUTE_UNUSED, int y ATTRIBUTE_UNUSED, SDL_Rect * update_rect ATTRIBUTE_UNUSED)
{

}

void confetti_shutdown(magic_api * api ATTRIBUTE_UNUSED)
{
  Mix_FreeChunk(confetti_snd);
}


//private functions

inline char confetti_get_greater(const char what1, const char what2)
{
  if (what1 > what2)
    return what1;
  else
    return what2;
}

inline char confetti_get_lesser(const char what1, const char what2)
{
  if (what1 < what2)
    return what1;
  else
    return what2;
}

// Interactivity functions

Uint32 confetti_get_new_color(void *ptr, SDL_Surface * canvas)  //this function creates new color very similar to the one choosen
{
  magic_api *api = (magic_api *) ptr;

  float hsv_h, hsv_s, hsv_v;
  Uint8 temp_r, temp_g, temp_b;

  api->rgbtohsv(confetti_colors.r, confetti_colors.g, confetti_colors.b, &hsv_h, &hsv_s, &hsv_v);       //color choosen by user is converted
  //to HSV palette

  hsv_h += ((rand() % 60) - 30) % 360;  //Every circle has different, but
  //smilar color
  if (hsv_h < 0)
    hsv_h *= -1;

  api->hsvtorgb(hsv_h, hsv_s, hsv_v, &temp_r, &temp_g, &temp_b);        //...and come back to RGB

  return SDL_MapRGB(canvas->format, temp_r, temp_g, temp_b);
}


static void confetti_circle(void *ptr, int which ATTRIBUTE_UNUSED,
                            SDL_Surface * canvas, SDL_Surface * last ATTRIBUTE_UNUSED, int x, int y)
{
  magic_api *api = (magic_api *) ptr;

  int xx, yy;
  Uint32 color = confetti_get_new_color(api, canvas);

  for (yy = y - CONFETTI_BRUSH_SIZE / 2; yy < y + CONFETTI_BRUSH_SIZE / 2; yy++)

    for (xx = x - CONFETTI_BRUSH_SIZE / 2; xx < x + CONFETTI_BRUSH_SIZE / 2; xx++)

      if (api->in_circle(xx - x, yy - y, CONFETTI_BRUSH_SIZE / 2))
        api->putpixel(canvas, xx, yy, color);
}

void confetti_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
                    SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect)
{
  unsigned char i;
  char min_x = 0, max_x = 0, min_y = 0, max_y = 0;
  char dx = 0, dy = 0;

  for (i = 0; i < CONFETTI_QUANTITY; i++)
    {
      srand((dx + dy) / 2 + time(0));   //to get a unique seed even if dx and dy aren't defined
      dx = (rand() % 100) - 50; //generate a value between <-50; +50>
      dy = (rand() % 100) - 50; //to spread confetti around the cursor position

      if (!i)
        {
          min_x = max_x = dx;
          min_y = max_y = dy;
        }
      else
        {
          min_x = confetti_get_lesser(min_x, dx);       //any candidates to new min/max values? Hands up please...
          max_x = confetti_get_greater(max_x, dx);
          min_y = confetti_get_lesser(min_y, dy);
          max_y = confetti_get_greater(max_y, dy);
        }
      confetti_circle((void *)api, which, canvas, last, x + dx, y + dy);
    }

  update_rect->x = x + min_x - CONFETTI_BRUSH_SIZE / 2;
  update_rect->y = y + min_y - CONFETTI_BRUSH_SIZE / 2;
  update_rect->w = CONFETTI_BRUSH_SIZE * 1.5 + max_x - min_x;
  update_rect->h = CONFETTI_BRUSH_SIZE * 1.5 + max_y - min_y;

  api->playsound(confetti_snd, (x * 255) / canvas->w, 255);
}

void confetti_drag(magic_api * api, int which, SDL_Surface * canvas,
                   SDL_Surface * snapshot, int ox, int oy, int x, int y, SDL_Rect * update_rect)
{
  int temp;

  if (ox > x)
    {
      temp = x;
      x = ox;
      ox = temp;
    }
  if (oy > y)
    {
      temp = y;
      y = oy;
      oy = temp;
    }

  confetti_click(api, which, MODE_PAINT, canvas, snapshot, x, y, update_rect);
}

void confetti_switchin(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
                       SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
}

void confetti_switchout(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
                        SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
}

int confetti_modes(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return (MODE_PAINT);
}