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New "Stretch" magic tool

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Docs/etc. to be updated in a separate commit.
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Bill Kendrick 2021-10-20 22:32:34 -07:00
parent 170453a42b
commit 1135225691
3 changed files with 286 additions and 0 deletions
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/*
stretch.c
"Stretch" Magic Tools Plugin
Tux Paint - A simple drawing program for children.
By Bill Kendrick
Some parts based on "Blind" Magic Tool by Pere Pujal Carabantes
Copyright (c) 2021
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)
*/
#include "tp_magic_api.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
int stretch_side, stretch_start_x, stretch_start_y;
enum stretch_sides
{
STRETCH_DIRECTION_VERT,
STRETCH_DIRECTION_HORIZ
};
enum stretch_tools
{
STRETCH_TOOL_STRETCH,
STRETCH_NUMTOOLS
};
Mix_Chunk *stretch_snd;
// Prototypes
Uint32 stretch_api_version(void);
void stretch_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
int stretch_init(magic_api * api);
int stretch_get_tool_count(magic_api * api);
SDL_Surface *stretch_get_icon(magic_api * api, int which);
char *stretch_get_name(magic_api * api, int which);
int stretch_get_group(magic_api * api, int which);
char *stretch_get_description(magic_api * api, int which, int mode);
int stretch_requires_colors(magic_api * api, int which);
void stretch_release(magic_api * api, int which,
SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect);
void stretch_shutdown(magic_api * api);
void stretch_paint_stretch(void *ptr_to_api, int which_tool, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y);
void stretch_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 stretch_click(magic_api * api, int which, int mode,
SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
void stretch_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
void stretch_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
int stretch_modes(magic_api * api, int which);
// Housekeeping functions
Uint32 stretch_api_version(void)
{
return (TP_MAGIC_API_VERSION);
}
void stretch_set_color(magic_api * api ATTRIBUTE_UNUSED, Uint8 r ATTRIBUTE_UNUSED, Uint8 g ATTRIBUTE_UNUSED, Uint8 b ATTRIBUTE_UNUSED)
{
}
int stretch_init(magic_api * api)
{
char fname[1024];
snprintf(fname, sizeof(fname), "%s/sounds/magic/stretch.ogg", api->data_directory);
stretch_snd = Mix_LoadWAV(fname);
return (1);
}
int stretch_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
{
return STRETCH_NUMTOOLS;
}
SDL_Surface *stretch_get_icon(magic_api * api, int which ATTRIBUTE_UNUSED)
{
char fname[1024];
snprintf(fname, sizeof(fname), "%s/images/magic/stretch.png", api->data_directory);
return (IMG_Load(fname));
}
char *stretch_get_name(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return strdup(gettext_noop("Stretch"));
}
int stretch_get_group(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return MAGIC_TYPE_PICTURE_WARPS;
}
char *stretch_get_description(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
{
return
strdup(gettext_noop
("Click and drag to stretch part of your picture vertically or horizontally."));
}
int stretch_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return 0;
}
void stretch_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 stretch_shutdown(magic_api * api ATTRIBUTE_UNUSED)
{
Mix_FreeChunk(stretch_snd);
}
// Interactivity functions
void stretch_drag(magic_api * api, int which ATTRIBUTE_UNUSED, SDL_Surface * canvas,
SDL_Surface * snapshot, int ox ATTRIBUTE_UNUSED, int oy ATTRIBUTE_UNUSED,
int x, int y, SDL_Rect * update_rect)
{
SDL_Rect src, dest;
float xx, yy;
float divisor1, divisor2;
SDL_BlitSurface(snapshot, NULL, canvas, NULL);
switch (stretch_side)
{
case STRETCH_DIRECTION_VERT:
{
if (y != stretch_start_y)
{
divisor1 = (float) y / (float) stretch_start_y;
divisor2 = (float) (canvas->h - y) / (float) (canvas->h - stretch_start_y);
for (yy = 0; yy < y; yy++)
{
src.x = 0;
src.y = (yy / divisor1);
src.w = canvas->w;
src.h = 1;
dest.x = 0;
dest.y = yy;
dest.w = canvas->w;
dest.h = 1;
SDL_BlitSurface(snapshot, &src, canvas, &dest);
}
for (yy = y; yy < canvas->h; yy++)
{
src.x = 0;
src.y = stretch_start_y + ((yy - y) / divisor2);
src.w = canvas->w;
src.h = 1;
dest.x = 0;
dest.y = yy;
dest.w = canvas->w;
dest.h = 1;
SDL_BlitSurface(snapshot, &src, canvas, &dest);
}
api->playsound(stretch_snd, 128, 255);
}
break;
}
case STRETCH_DIRECTION_HORIZ:
{
if (x != stretch_start_x)
{
divisor1 = (float) x / (float) stretch_start_x;
divisor2 = (float) (canvas->w - x) / (float) (canvas->w - stretch_start_x);
for (xx = 0; xx < x; xx++)
{
src.x = (xx / divisor1);
src.y = 0;
src.w = 1;
src.h = canvas->h;
dest.x = xx;
dest.y = 0;
dest.w = 1;
dest.h = canvas->h;
SDL_BlitSurface(snapshot, &src, canvas, &dest);
}
for (xx = x; xx < canvas->w; xx++)
{
src.x = stretch_start_x + ((xx - x) / divisor2);
src.y = 0;
src.w = 1;
src.h = canvas->h;
dest.x = xx;
dest.y = 0;
dest.w = 1;
dest.h = canvas->h;
SDL_BlitSurface(snapshot, &src, canvas, &dest);
}
api->playsound(stretch_snd, (x * 255) / canvas->w, 255);
}
break;
}
}
update_rect->x = 0;
update_rect->y = 0;
update_rect->w = canvas->w;
update_rect->h = canvas->h;
}
void stretch_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect)
{
if (y < canvas->h / 2)
{
if (x < y)
stretch_side = STRETCH_DIRECTION_HORIZ;
else if (canvas->w - x < y)
stretch_side = STRETCH_DIRECTION_HORIZ;
else
stretch_side = STRETCH_DIRECTION_VERT;
}
else
{
if (x < canvas->h - y)
stretch_side = STRETCH_DIRECTION_HORIZ;
else if (canvas->w - x < canvas->h - y)
stretch_side = STRETCH_DIRECTION_HORIZ;
else
stretch_side = STRETCH_DIRECTION_VERT;
}
stretch_start_x = x;
stretch_start_y = y;
stretch_drag(api, which, canvas, last, x, y, x, y, update_rect);
}
void stretch_switchin(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
}
void stretch_switchout(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
}
int stretch_modes(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
return (MODE_PAINT);
}