407 lines
11 KiB
C
407 lines
11 KiB
C
/* swirls.c
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Transforms parts of the image into brush strokes that
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swirl or shoot out from around where you click,
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or in the case of Fur, paint following the mouse.
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Inspired by "Night Sky Scene [Pen Parallax]" Scratch Project
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by -HexaScape- <https://scratch.mit.edu/users/-HexaScape->
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Last updated: February 16, 2023
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*/
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#include <stdio.h>
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#include <string.h>
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#include <libintl.h>
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#include <math.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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enum {
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SWIRL_TOOL_CIRCLES,
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SWIRL_TOOL_RAYS,
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SWIRL_TOOL_FUR,
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NUM_SWIRL_TOOLS
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};
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char * swirl_names[NUM_SWIRL_TOOLS] = {
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gettext_noop("Circles"),
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gettext_noop("Rays"),
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gettext_noop("Fur")
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};
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char * swirl_descriptions[NUM_SWIRL_TOOLS][2] = {
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{
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gettext_noop("Click and drag to transform parts of your picture to circular brushstrokes."),
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gettext_noop("Click to turn your entire picture into circular brushstrokes.")
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},
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{
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gettext_noop("Click and drag to transform parts of your picture to brushstroke rays."),
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gettext_noop("Click to turn your entire picture into brushstroke rays.")
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},
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{
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gettext_noop("Click and drag to add fur to your picture."),
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""
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},
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};
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char * swirl_icon_filenames[NUM_SWIRL_TOOLS] = {
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"swirls_circles.png",
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"swirls_rays.png",
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"swirls_fur.png"
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};
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char * swirl_sfx_filenames[NUM_SWIRL_TOOLS] = {
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"swirls_circles.ogg",
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"swirls_rays.ogg",
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"swirls_fur.ogg"
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};
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int SWIRLS_NUM_STROKES_PER_DRAG_LINE[NUM_SWIRL_TOOLS] = {
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5,
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5,
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15
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};
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int SWIRLS_DRAG_LINE_STROKE_RADIUS[NUM_SWIRL_TOOLS] = {
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64,
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64,
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16
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};
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int SWIRLS_STROKE_LENGTH[NUM_SWIRL_TOOLS] = {
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10,
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10,
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5
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};
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Mix_Chunk *snd_effects[NUM_SWIRL_TOOLS];
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SDL_Surface * swirls_snapshot = NULL;
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int swirls_start_x, swirls_start_y;
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Uint32 swirl_stroke_color;
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Uint8 swirl_fur_color_r, swirl_fur_color_g, swirl_fur_color_b;
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Uint32 swirls_api_version(void);
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int swirls_init(magic_api * api);
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int swirls_get_tool_count(magic_api * api);
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SDL_Surface *swirls_get_icon(magic_api * api, int which);
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char *swirls_get_name(magic_api * api, int which);
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int swirls_get_group(magic_api * api, int which);
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char *swirls_get_description(magic_api * api, int which, int mode);
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int swirls_requires_colors(magic_api * api, int which);
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int swirls_modes(magic_api * api, int which);
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void swirls_shutdown(magic_api * api);
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void swirls_click(magic_api * api, int which, int mode,
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SDL_Surface * canvas, SDL_Surface * snapshot, int x,
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int y, SDL_Rect * update_rect);
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void swirls_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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void swirls_drag(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * snapshot, int ox, int oy, int x, int y,
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SDL_Rect * update_rect);
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void swirls_line_callback_drag(void *ptr, int which, SDL_Surface * canvas,
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SDL_Surface * snapshot, int x, int y);
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void swirls_draw_stroke(magic_api * api, int which, SDL_Surface * canvas, int x, int y);
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void swirls_line_callback_draw_stroke(void *ptr, int which ATTRIBUTE_UNUSED,
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SDL_Surface * canvas,
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SDL_Surface * snapshot ATTRIBUTE_UNUSED,
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int x, int y);
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void swirls_release(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * snapshot, int x, int y,
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SDL_Rect * update_rect);
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void swirls_switchin(magic_api * api, int which, int mode,
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SDL_Surface * canvas);
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void swirls_switchout(magic_api * api, int which, int mode,
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SDL_Surface * canvas);
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double get_angle(int x, int y, int target_x, int target_y);
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Uint32 swirls_api_version(void)
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{
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return (TP_MAGIC_API_VERSION);
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}
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int swirls_init(magic_api * api)
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{
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int i;
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char fname[1024];
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for (i = 0; i < NUM_SWIRL_TOOLS; i++) {
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snprintf(fname, sizeof(fname), "%ssounds/magic/%s",
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api->data_directory, swirl_sfx_filenames[i]);
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snd_effects[i] = Mix_LoadWAV(fname);
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}
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return (1);
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}
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int swirls_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
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{
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return (NUM_SWIRL_TOOLS);
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}
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SDL_Surface *swirls_get_icon(magic_api * api, int which)
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{
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char fname[1024];
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snprintf(fname, sizeof(fname), "%simages/magic/%s",
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api->data_directory, swirl_icon_filenames[which]);
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return (IMG_Load(fname));
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}
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char *swirls_get_name(magic_api * api ATTRIBUTE_UNUSED,
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int which)
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{
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return strdup(gettext(swirl_names[which]));
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}
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int swirls_get_group(magic_api * api ATTRIBUTE_UNUSED,
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int which ATTRIBUTE_UNUSED)
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{
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if (which == SWIRL_TOOL_FUR) {
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return MAGIC_TYPE_PAINTING;
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} else {
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return MAGIC_TYPE_DISTORTS;
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}
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}
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char *swirls_get_description(magic_api * api ATTRIBUTE_UNUSED,
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int which, int mode)
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{
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return strdup(gettext(swirl_descriptions[which][mode - 1]));
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}
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int swirls_requires_colors(magic_api * api ATTRIBUTE_UNUSED,
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int which)
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{
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if (which == SWIRL_TOOL_FUR) {
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return 1;
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} else {
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return 0;
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}
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}
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int swirls_modes(magic_api * api ATTRIBUTE_UNUSED,
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int which ATTRIBUTE_UNUSED)
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{
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if (which == SWIRL_TOOL_FUR) {
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return MODE_PAINT;
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} else {
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return (MODE_PAINT | MODE_FULLSCREEN);
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}
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}
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void swirls_shutdown(magic_api * api ATTRIBUTE_UNUSED)
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{
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int i;
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for (i = 0; i < NUM_SWIRL_TOOLS; i++) {
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if (snd_effects[i] != NULL)
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Mix_FreeChunk(snd_effects[i]);
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}
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}
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void
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swirls_click(magic_api * api, int which, int mode,
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SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y,
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SDL_Rect * update_rect)
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{
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if (snd_effects[which] != NULL)
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api->stopsound();
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swirls_start_x = x;
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swirls_start_y = y;
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if (mode == MODE_PAINT) {
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swirls_drag(api, which, canvas, snapshot, x, y, x, y, update_rect);
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} else {
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if (snd_effects[which] != NULL) {
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api->playsound(snd_effects[which], (x * 255) / canvas->w, 255);
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}
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for (x = 0; x < canvas->w; x++) {
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for (y = 0; y < canvas->h; y++) {
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if (rand() % 100 == 0) {
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swirls_draw_stroke(api, which, canvas, x, y);
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}
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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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}
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void
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swirls_drag(magic_api * api ATTRIBUTE_UNUSED, 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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{
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if (which == SWIRL_TOOL_FUR) {
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swirls_start_x = x;
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swirls_start_y = y;
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}
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api->line((void *) api, which, canvas, snapshot, ox, oy, x, y, 1 /* FIXME: Consider fewer iterations? */,
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swirls_line_callback_drag);
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/* FIXME: Would be good to only update the area around the line (ox,oy)->(x,y) (+/- the maxium radius of the effect) */
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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 swirls_release(magic_api * api, int which,
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SDL_Surface * canvas ATTRIBUTE_UNUSED,
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SDL_Surface * snapshot ATTRIBUTE_UNUSED,
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int x ATTRIBUTE_UNUSED, int y ATTRIBUTE_UNUSED,
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SDL_Rect * update_rect ATTRIBUTE_UNUSED) {
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if (snd_effects[which] != NULL && which != SWIRL_TOOL_FUR)
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api->stopsound();
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}
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void swirls_set_color(magic_api * api ATTRIBUTE_UNUSED, 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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Uint8 r, Uint8 g, Uint8 b,
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SDL_Rect * update_rect ATTRIBUTE_UNUSED)
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{
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swirl_fur_color_r = r;
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swirl_fur_color_g = g;
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swirl_fur_color_b = b;
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}
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void swirls_line_callback_drag(void *ptr, int which,
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SDL_Surface * canvas,
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SDL_Surface * snapshot ATTRIBUTE_UNUSED,
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int x, int y)
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{
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int i, ang_deg, radius, nx, ny;
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double ang_rad;
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magic_api *api = (magic_api *) ptr;
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if (snd_effects[which] != NULL)
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api->playsound(snd_effects[which], (x * 255) / canvas->w, 255);
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for (i = 0; i < SWIRLS_NUM_STROKES_PER_DRAG_LINE[which]; i++) {
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ang_deg = (rand() % 360);
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ang_rad = (ang_deg * M_PI) / 180.0;
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radius = (rand() % (SWIRLS_DRAG_LINE_STROKE_RADIUS[which] * 2)) - SWIRLS_DRAG_LINE_STROKE_RADIUS[which];
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nx = x + (int) (cos(ang_rad) * radius);
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ny = y + (int) (sin(ang_rad) * radius);
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swirls_draw_stroke(api, which, canvas, nx, ny);
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}
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}
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void swirls_draw_stroke(magic_api * api, int which, SDL_Surface * canvas, int x, int y) {
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int x1, y1, x2, y2, len;
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double a;
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Uint8 r, g, b;
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float h, s, v;
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len = SWIRLS_STROKE_LENGTH[which];
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a = get_angle(x, y, swirls_start_x, swirls_start_y);
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if (which == SWIRL_TOOL_CIRCLES) {
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a = a + (M_PI / 2.0);
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}
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x1 = x - cos(a) * len;
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y1 = y - sin(a) * len;
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x2 = x + cos(a) * len;
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y2 = y + sin(a) * len;
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if (which == SWIRL_TOOL_FUR) {
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r = swirl_fur_color_r;
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g = swirl_fur_color_g;
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b = swirl_fur_color_b;
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} else {
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swirl_stroke_color = api->getpixel(swirls_snapshot, x, y);
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SDL_GetRGB(swirl_stroke_color, canvas->format, &r, &g, &b);
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}
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api->rgbtohsv(r, g, b, &h, &s, &v);
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h = h + (((rand() % 7) - 3) / 10.0);
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if (s > 0.00) {
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s = s + (((rand() % 3) - 1) / 10.0);
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}
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v = v + (((rand() % 3) - 1) / 10.0);
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if (h < 0.0) {
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h = h - 360.0;
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} else if (h >= 360.0) {
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h = h - 360.0;
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}
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if (s < 0.0) {
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s = 0.0;
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} else if (s > 1.0) {
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s = 1.0;
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}
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if (v < 0.0) {
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v = 0.0;
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} else if (v > 1.0) {
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v = 1.0;
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}
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api->hsvtorgb(h, s, v, &r, &g, &b);
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swirl_stroke_color = SDL_MapRGB(canvas->format, r, g, b);
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api->line((void *) api, which, canvas, NULL /* N/A */,
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x1, y1, x2, y2, 1, swirls_line_callback_draw_stroke);
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}
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void swirls_line_callback_draw_stroke(void *ptr, int which,
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SDL_Surface * canvas,
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SDL_Surface * snapshot ATTRIBUTE_UNUSED,
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int x, int y) {
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magic_api *api = (magic_api *) ptr;
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if (which == SWIRL_TOOL_FUR) {
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api->putpixel(canvas, x, y, swirl_stroke_color);
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} else {
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int xx, yy;
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for (yy = -1; yy <= 1; yy++) {
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for (xx = -1; xx <= 1; xx++) {
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api->putpixel(canvas, x + xx, y + yy, swirl_stroke_color);
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}
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}
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}
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}
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void swirls_switchin(magic_api * api ATTRIBUTE_UNUSED,
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int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
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SDL_Surface * canvas)
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{
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if (swirls_snapshot == NULL)
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swirls_snapshot = SDL_CreateRGBSurface(SDL_SWSURFACE, canvas->w, canvas->h,
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canvas->format->BitsPerPixel, canvas->format->Rmask,
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canvas->format->Gmask, canvas->format->Bmask,
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canvas->format->Amask);
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if (swirls_snapshot != NULL)
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SDL_BlitSurface(canvas, NULL, swirls_snapshot, NULL);
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}
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void swirls_switchout(magic_api * api ATTRIBUTE_UNUSED,
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int which ATTRIBUTE_UNUSED,
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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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double get_angle(int x, int y, int target_x, int target_y) {
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return atan2((double) (y - target_y), (double) (x - target_x));
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}
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