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

/*
  rosette.c

  Rosette Magic Tools Plugin + Picasso Magic Tools Plugin 
  Tux Paint - A simple drawing program for children.

  Credits: Adam 'foo-script' Rakowski <foo-script@o2.pl>

  Copyright (c) 2002-2008 by Bill Kendrick and others; see AUTHORS.txt
  bill@newbreedsoftware.com
  http://www.tuxpaint.org/

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  (See COPYING.txt)
*/

// sound only plays on release
// also same sound for both tools

#include "tp_magic_api.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
#include <math.h>               //for sin, cos, ...
#define ROSETTE_R 8             //circle's diameter

static int xmid, ymid;

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

struct rosette_rgb rosette_colors;

Mix_Chunk *rosette_snd;

//                              Housekeeping functions

Uint32 rosette_api_version(void);
void rosette_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
int rosette_init(magic_api * api);
int rosette_get_tool_count(magic_api * api);
SDL_Surface *rosette_get_icon(magic_api * api, int which);
char *rosette_get_name(magic_api * api, int which);
char *rosette_get_description(magic_api * api, int which, int mode);
int rosette_requires_colors(magic_api * api, int which);
void rosette_release(magic_api * api, int which,
                     SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect);
void rosette_shutdown(magic_api * api);
void rosette_draw(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y);
void rosette_drag(magic_api * api, int which, SDL_Surface * canvas,
                  SDL_Surface * snapshot, int ox, int oy, int x, int y, SDL_Rect * update_rect);

void rosette_click(magic_api * api, int which, int mode,
                   SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
void rosette_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
void rosette_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
int rosette_modes(magic_api * api, int which);
void rosette_circle(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y);

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

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

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

  snprintf(fname, sizeof(fname), "%ssounds/magic/picasso.ogg", api->data_directory);
  rosette_snd = Mix_LoadWAV(fname);

  return (1);
}

int rosette_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
{
  return 2;
}

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

  if (!which)
    snprintf(fname, sizeof(fname), "%simages/magic/rosette.png", api->data_directory);
  else
    snprintf(fname, sizeof(fname), "%simages/magic/picasso.png", api->data_directory);

  return (IMG_Load(fname));
}

char *rosette_get_name(magic_api * api ATTRIBUTE_UNUSED, int which)
{
  if (!which)
    return strdup(gettext_noop("Rosette"));
  else
    return strdup(gettext_noop("Picasso"));
}

char *rosette_get_description(magic_api * api ATTRIBUTE_UNUSED, int which, int mode ATTRIBUTE_UNUSED)
{
  if (!which)
    return strdup(gettext_noop("Click and start drawing your rosette."));       //just k'scope with 3 bits?  
  else
    return strdup(gettext_noop("You can draw just like Picasso!"));     //what is this actually doing?
}

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

void rosette_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 rosette_shutdown(magic_api * api ATTRIBUTE_UNUSED)
{
  Mix_FreeChunk(rosette_snd);
}

// Interactivity functions

void rosette_circle(void *ptr, int which ATTRIBUTE_UNUSED,
                    SDL_Surface * canvas, SDL_Surface * snapshot ATTRIBUTE_UNUSED, int x, int y)
{
  magic_api *api = (magic_api *) ptr;

  int xx, yy;

  for (yy = y - ROSETTE_R; yy < y + ROSETTE_R; yy++)
    for (xx = x - ROSETTE_R; xx < x + ROSETTE_R; xx++)
      if (api->in_circle(xx - x, yy - y, ROSETTE_R / 2))
        api->putpixel(canvas, xx, yy, SDL_MapRGB(canvas->format, rosette_colors.r, rosette_colors.g, rosette_colors.b));

}

void rosette_draw(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y)
{
  magic_api *api = (magic_api *) ptr;

  double angle;
  double xx, yy;                //distance to the center of the image
  int x1, y1, x2, y2;

  xx = (double)(xmid - x);
  yy = (double)(y - ymid);

  if (which == 0)
    {
      angle = 2 * M_PI / 3;     //an angle between brushes

      x1 = (int)(xx * cos(angle) - yy * sin(angle));
      y1 = (int)(xx * sin(angle) + yy * cos(angle));

      x2 = (int)(xx * cos(2 * angle) - yy * sin(2 * angle));
      y2 = (int)(xx * sin(2 * angle) + yy * cos(2 * angle));
    }
  else
    {
      angle = atan(yy / xx);

      if ((xx < 0) && (yy > 0))
        angle += M_PI;

      if ((xx < 0) && (yy < 0))
        angle += M_PI;

      if ((xx > 0) && (yy < 0))
        angle += 2 * M_PI;

      if ((y == ymid) && (xx < 0))
        angle = M_PI;

      x1 = (int)(xx * cos(2 * angle) - yy * sin(2 * angle));
      y1 = (int)(xx * sin(2 * angle) - yy * cos(angle));

      x2 = (int)(xx * cos(2 * angle) - yy * sin(2 * angle));
      y2 = (int)(xx * sin(2 * angle) + yy * cos(2 * angle));
    }

  rosette_circle(api, which, canvas, snapshot, x, y);
  rosette_circle(api, which, canvas, snapshot, (-1) * (x1 - xmid), y1 + ymid);
  rosette_circle(api, which, canvas, snapshot, (-1) * (x2 - xmid), y2 + ymid);
}

void rosette_drag(magic_api * api, int which, SDL_Surface * canvas,
                  SDL_Surface * snapshot, int ox, int oy, int x, int y, SDL_Rect * update_rect)
{
  api->line((void *)api, which, canvas, snapshot, ox, oy, x, y, 1, rosette_draw);
  api->playsound(rosette_snd, (x * 255) / canvas->w, 255);

  update_rect->x = update_rect->y = 0;
  update_rect->w = canvas->w;
  update_rect->h = canvas->h;
}

void rosette_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
                   SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect)
{
  rosette_drag(api, which, canvas, last, x, y, x, y, update_rect);
}

void rosette_switchin(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
                      SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
  xmid = canvas->w / 2;
  ymid = canvas->h / 2;
}

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

}

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