New "Stretch" magic tool
Docs/etc. to be updated in a separate commit.
This commit is contained in:
Bill Kendrick
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magic/icons/stretch.png
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magic/icons/stretch.png
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magic/sounds/stretch.ogg
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magic/sounds/stretch.ogg
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magic/src/stretch.c
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magic/src/stretch.c
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/*
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stretch.c
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"Stretch" Magic Tools Plugin
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Tux Paint - A simple drawing program for children.
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By Bill Kendrick
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Some parts based on "Blind" Magic Tool by Pere Pujal Carabantes
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Copyright (c) 2021
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http://www.tuxpaint.org/
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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(See COPYING.txt)
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*/
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#include "tp_magic_api.h"
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#include "SDL_image.h"
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#include "SDL_mixer.h"
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int stretch_side, stretch_start_x, stretch_start_y;
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enum stretch_sides
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{
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STRETCH_DIRECTION_VERT,
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STRETCH_DIRECTION_HORIZ
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};
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enum stretch_tools
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{
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STRETCH_TOOL_STRETCH,
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STRETCH_NUMTOOLS
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};
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Mix_Chunk *stretch_snd;
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// Prototypes
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Uint32 stretch_api_version(void);
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void stretch_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
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int stretch_init(magic_api * api);
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int stretch_get_tool_count(magic_api * api);
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SDL_Surface *stretch_get_icon(magic_api * api, int which);
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char *stretch_get_name(magic_api * api, int which);
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int stretch_get_group(magic_api * api, int which);
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char *stretch_get_description(magic_api * api, int which, int mode);
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int stretch_requires_colors(magic_api * api, int which);
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void stretch_release(magic_api * api, int which,
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SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y, SDL_Rect * update_rect);
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void stretch_shutdown(magic_api * api);
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void stretch_paint_stretch(void *ptr_to_api, int which_tool, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y);
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void stretch_drag(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * snapshot, int ox, int oy, int x, int y, SDL_Rect * update_rect);
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void stretch_click(magic_api * api, int which, int mode,
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SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
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void stretch_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
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void stretch_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
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int stretch_modes(magic_api * api, int which);
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// Housekeeping functions
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Uint32 stretch_api_version(void)
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{
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return (TP_MAGIC_API_VERSION);
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}
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void stretch_set_color(magic_api * api ATTRIBUTE_UNUSED, Uint8 r ATTRIBUTE_UNUSED, Uint8 g ATTRIBUTE_UNUSED, Uint8 b ATTRIBUTE_UNUSED)
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{
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}
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int stretch_init(magic_api * api)
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{
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char fname[1024];
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snprintf(fname, sizeof(fname), "%s/sounds/magic/stretch.ogg", api->data_directory);
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stretch_snd = Mix_LoadWAV(fname);
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return (1);
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}
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int stretch_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
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{
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return STRETCH_NUMTOOLS;
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}
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SDL_Surface *stretch_get_icon(magic_api * api, int which ATTRIBUTE_UNUSED)
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{
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char fname[1024];
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snprintf(fname, sizeof(fname), "%s/images/magic/stretch.png", api->data_directory);
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return (IMG_Load(fname));
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}
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char *stretch_get_name(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return strdup(gettext_noop("Stretch"));
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}
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int stretch_get_group(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return MAGIC_TYPE_PICTURE_WARPS;
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}
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char *stretch_get_description(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
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{
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return
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strdup(gettext_noop
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("Click and drag to stretch part of your picture vertically or horizontally."));
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}
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int stretch_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return 0;
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}
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void stretch_release(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
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SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * snapshot ATTRIBUTE_UNUSED,
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int x ATTRIBUTE_UNUSED, int y ATTRIBUTE_UNUSED, SDL_Rect * update_rect ATTRIBUTE_UNUSED)
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{
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}
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void stretch_shutdown(magic_api * api ATTRIBUTE_UNUSED)
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{
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Mix_FreeChunk(stretch_snd);
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}
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// Interactivity functions
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void stretch_drag(magic_api * api, int which ATTRIBUTE_UNUSED, SDL_Surface * canvas,
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SDL_Surface * snapshot, int ox ATTRIBUTE_UNUSED, int oy ATTRIBUTE_UNUSED,
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int x, int y, SDL_Rect * update_rect)
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{
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SDL_Rect src, dest;
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float xx, yy;
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float divisor1, divisor2;
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SDL_BlitSurface(snapshot, NULL, canvas, NULL);
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switch (stretch_side)
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{
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case STRETCH_DIRECTION_VERT:
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{
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if (y != stretch_start_y)
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{
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divisor1 = (float) y / (float) stretch_start_y;
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divisor2 = (float) (canvas->h - y) / (float) (canvas->h - stretch_start_y);
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for (yy = 0; yy < y; yy++)
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{
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src.x = 0;
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src.y = (yy / divisor1);
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src.w = canvas->w;
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src.h = 1;
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dest.x = 0;
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dest.y = yy;
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dest.w = canvas->w;
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dest.h = 1;
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SDL_BlitSurface(snapshot, &src, canvas, &dest);
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}
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for (yy = y; yy < canvas->h; yy++)
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{
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src.x = 0;
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src.y = stretch_start_y + ((yy - y) / divisor2);
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src.w = canvas->w;
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src.h = 1;
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dest.x = 0;
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dest.y = yy;
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dest.w = canvas->w;
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dest.h = 1;
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SDL_BlitSurface(snapshot, &src, canvas, &dest);
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}
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api->playsound(stretch_snd, 128, 255);
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}
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break;
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}
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case STRETCH_DIRECTION_HORIZ:
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{
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if (x != stretch_start_x)
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{
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divisor1 = (float) x / (float) stretch_start_x;
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divisor2 = (float) (canvas->w - x) / (float) (canvas->w - stretch_start_x);
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for (xx = 0; xx < x; xx++)
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{
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src.x = (xx / divisor1);
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src.y = 0;
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src.w = 1;
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src.h = canvas->h;
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dest.x = xx;
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dest.y = 0;
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dest.w = 1;
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dest.h = canvas->h;
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SDL_BlitSurface(snapshot, &src, canvas, &dest);
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}
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for (xx = x; xx < canvas->w; xx++)
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{
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src.x = stretch_start_x + ((xx - x) / divisor2);
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src.y = 0;
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src.w = 1;
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src.h = canvas->h;
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dest.x = xx;
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dest.y = 0;
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dest.w = 1;
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dest.h = canvas->h;
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SDL_BlitSurface(snapshot, &src, canvas, &dest);
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}
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api->playsound(stretch_snd, (x * 255) / canvas->w, 255);
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}
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break;
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}
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}
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update_rect->x = 0;
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update_rect->y = 0;
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update_rect->w = canvas->w;
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update_rect->h = canvas->h;
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}
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void stretch_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
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SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect)
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{
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if (y < canvas->h / 2)
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{
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if (x < y)
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stretch_side = STRETCH_DIRECTION_HORIZ;
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else if (canvas->w - x < y)
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stretch_side = STRETCH_DIRECTION_HORIZ;
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else
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stretch_side = STRETCH_DIRECTION_VERT;
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}
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else
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{
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if (x < canvas->h - y)
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stretch_side = STRETCH_DIRECTION_HORIZ;
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else if (canvas->w - x < canvas->h - y)
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stretch_side = STRETCH_DIRECTION_HORIZ;
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else
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stretch_side = STRETCH_DIRECTION_VERT;
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}
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stretch_start_x = x;
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stretch_start_y = y;
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stretch_drag(api, which, canvas, last, x, y, x, y, update_rect);
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}
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void stretch_switchin(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
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SDL_Surface * canvas ATTRIBUTE_UNUSED)
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{
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}
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void stretch_switchout(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
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SDL_Surface * canvas ATTRIBUTE_UNUSED)
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{
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}
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int stretch_modes(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return (MODE_PAINT);
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}
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