288 lines
9 KiB
C
288 lines
9 KiB
C
/*
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ribbon.c
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Ribbon Magic Tool Plugin
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Tux Paint - A simple drawing program for children.
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Copyright (c) 2023-2023 by Bill Kendrick and others; see AUTHORS.txt
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bill@newbreedsoftware.com
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https://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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Last updated: May 23, 2023
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*/
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#include <stdio.h>
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#include <string.h>
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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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/* Our globals: */
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#define MAX_LENGTH 256
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#define NUM_LENGTH_OPTIONS 4
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#define ribbon_radius 8
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static int ribbon_max_length = (MAX_LENGTH / 2);
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static Uint8 ribbon_r, ribbon_g, ribbon_b;
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static Uint32 ribbon_segment_color;
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static int ribbon_x[MAX_LENGTH], ribbon_y[MAX_LENGTH];
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static int ribbon_tail = 0, ribbon_head = 0;
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static double ribbon_old_angle;
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static Mix_Chunk *ribbon_snd;
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int ribbon_init(magic_api * api, Uint32 disabled_features);
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Uint32 ribbon_api_version(void);
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int ribbon_get_tool_count(magic_api * api);
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SDL_Surface *ribbon_get_icon(magic_api * api, int which);
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char *ribbon_get_name(magic_api * api, int which);
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int ribbon_get_group(magic_api * api, int which);
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char *ribbon_get_description(magic_api * api, int which, int mode);
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static void ribbon_linecb(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * last, int x, int y);
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void ribbon_drag(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * last, int ox, int oy, int x, int y, SDL_Rect * update_rect);
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void ribbon_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 ribbon_release(magic_api * api, int which,
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SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
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void ribbon_shutdown(magic_api * api);
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void ribbon_set_color(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * last, Uint8 r, Uint8 g, Uint8 b, SDL_Rect * update_rect);
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int ribbon_requires_colors(magic_api * api, int which);
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void ribbon_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
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void ribbon_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
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int ribbon_modes(magic_api * api, int which);
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Uint8 ribbon_accepted_sizes(magic_api * api, int which, int mode);
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Uint8 ribbon_default_size(magic_api * api, int which, int mode);
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void ribbon_set_size(magic_api * api, int which, int mode, SDL_Surface * canvas, SDL_Surface * last, Uint8 size,
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SDL_Rect * update_rect);
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Uint32 ribbon_api_version(void)
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{
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return (TP_MAGIC_API_VERSION);
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}
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// Load our sfx:
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int ribbon_init(magic_api * api, Uint32 disabled_features ATTRIBUTE_UNUSED)
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{
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char fname[1024];
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snprintf(fname, sizeof(fname), "%ssounds/magic/ribbon.ogg", api->data_directory);
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ribbon_snd = Mix_LoadWAV(fname);
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return (1);
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}
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// We have multiple tools:
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int ribbon_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
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{
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return 1;
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}
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// Load our icons:
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SDL_Surface *ribbon_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), "%simages/magic/ribbon.png", api->data_directory);
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return (IMG_Load(fname));
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}
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// Return our names, localized:
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char *ribbon_get_name(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return (strdup(gettext_noop("Ribbon")));
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}
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// Return our group:
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int ribbon_get_group(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return MAGIC_TYPE_PAINTING;
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}
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// Return our descriptions, localized:
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char *ribbon_get_description(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
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{
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return (strdup(gettext_noop("Add a flowing ribbon to your picture.")));
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}
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// Do the effect:
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static void ribbon_linecb(void *ptr, int which ATTRIBUTE_UNUSED,
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SDL_Surface * canvas, SDL_Surface * last ATTRIBUTE_UNUSED, int x, int y)
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{
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magic_api *api = (magic_api *) ptr;
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int i;
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for (i = - ribbon_radius; i < ribbon_radius; i++)
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{
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api->putpixel(canvas, x + i, y + i, ribbon_segment_color);
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api->putpixel(canvas, x + i, y + i + 1, ribbon_segment_color);
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api->putpixel(canvas, x + i + 1, y + i, ribbon_segment_color);
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}
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}
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// Affect the canvas on drag:
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void ribbon_drag(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * last, int ox, int oy, int x, int y, SDL_Rect * update_rect)
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{
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int pt, pt2, first_click;
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Uint8 r, g, b;
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int angle;
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SDL_BlitSurface(last, NULL, canvas, NULL);
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ribbon_x[ribbon_head] = x;
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ribbon_y[ribbon_head] = y;
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first_click = (ribbon_head == 0 && ribbon_tail == 0);
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ribbon_head = (ribbon_head + 1) % ribbon_max_length;
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if (ribbon_head == ribbon_tail)
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ribbon_tail = (ribbon_tail + 1) % ribbon_max_length;
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angle = 0.0;
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if (!first_click) {
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double x_angle;
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if (sqrt((x - ox) * (x - ox) + (y - oy) * (y - oy)) > 16)
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{
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/* Play swooshing sfx if we're moving quickly and making a big angle */
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x_angle = (fabs(atan2((double)(y - oy), (double)(x - ox))) * 2.0);
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if (fabs(x_angle - ribbon_old_angle) > (M_PI / 4.0))
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api->playsound(ribbon_snd, (x * 255) / canvas->w, 255);
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ribbon_old_angle = x_angle;
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}
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pt = ribbon_tail;
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do {
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int brt;
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pt2 = ((pt + 1) % ribbon_max_length);
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ox = ribbon_x[pt];
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oy = ribbon_y[pt];
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x = ribbon_x[pt2];
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y = ribbon_y[pt2];
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x_angle = (fabs(atan2((double)(y - oy), (double)(x - ox))) * 2.0);
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if (pt == ribbon_tail)
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angle = x_angle;
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else
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angle = (angle + x_angle) / 2.0;
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brt = ((angle - (M_PI / 4)) * 128.0) / M_PI;
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r = max(min(ribbon_r + brt, 255), 0);
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g = max(min(ribbon_g + brt, 255), 0);
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b = max(min(ribbon_b + brt, 255), 0);
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ribbon_segment_color = SDL_MapRGB(canvas->format, r, g, b);
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api->line((void *)api, which, canvas, last, ox, oy, x, y, 1, ribbon_linecb);
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pt = pt2;
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} while (((pt + 1) % ribbon_max_length) != ribbon_head);
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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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// Affect the canvas on click:
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void ribbon_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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ribbon_head = ribbon_tail = ribbon_old_angle = 0;
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ribbon_drag(api, which, canvas, last, x, y, x, y, update_rect);
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}
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void ribbon_release(magic_api * api ATTRIBUTE_UNUSED,
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int which ATTRIBUTE_UNUSED,
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SDL_Surface * canvas ATTRIBUTE_UNUSED,
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SDL_Surface * last 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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// Clean up
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void ribbon_shutdown(magic_api * api ATTRIBUTE_UNUSED)
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{
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if (ribbon_snd != NULL)
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Mix_FreeChunk(ribbon_snd);
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}
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// Record the color from Tux Paint:
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void ribbon_set_color(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
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SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * last ATTRIBUTE_UNUSED,
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Uint8 r, Uint8 g, Uint8 b,
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SDL_Rect * update_rect ATTRIBUTE_UNUSED)
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{
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ribbon_r = r;
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ribbon_g = g;
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ribbon_b = b;
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}
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// Use colors:
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int ribbon_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return 1;
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}
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void ribbon_switchin(magic_api * api ATTRIBUTE_UNUSED,
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int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED, SDL_Surface * canvas ATTRIBUTE_UNUSED)
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{
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}
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void ribbon_switchout(magic_api * api ATTRIBUTE_UNUSED,
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int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED, SDL_Surface * canvas ATTRIBUTE_UNUSED)
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{
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}
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int ribbon_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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Uint8 ribbon_accepted_sizes(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
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{
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return NUM_LENGTH_OPTIONS;
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}
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Uint8 ribbon_default_size(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
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{
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return (NUM_LENGTH_OPTIONS / 2);
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}
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void ribbon_set_size(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
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SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * last ATTRIBUTE_UNUSED, Uint8 size,
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SDL_Rect * update_rect ATTRIBUTE_UNUSED)
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{
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ribbon_max_length = (size * MAX_LENGTH) / NUM_LENGTH_OPTIONS;
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}
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