WIP Centered trochoids tools
Epitrochoid & Hypotrochoid to draw Spiralgraph / Wondergraph style line artwork. See https://sourceforge.net/p/tuxpaint/feature-requests/248/
This commit is contained in:
Bill Kendrick
parent
cecb344faf
commit
6b4e82c8b4
2 changed files with 513 additions and 1 deletions
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@ -6,7 +6,7 @@ Copyright (c) 2002-2024
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Various contributors (see below, and AUTHORS.txt)
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https://tuxpaint.org/
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2024.January.2 (0.9.32)
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2024.January.7 (0.9.32)
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* Improvements to Magic tools:
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----------------------------
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* Support for complexity levels in Magic tools via the plugin API.
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@ -54,6 +54,19 @@ https://tuxpaint.org/
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(https://freesound.org/people/mudflea2/sounds/708182/)
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Creative Commons 0 by mudflea2
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* WIP - Epitrochoid and Hypotrochoid magic tools:
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+ Tools to draw centered trochoids; to create art similar to a
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Spirograph or Wondergraph. Drag left/right to adjust the
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radius of the stator (fixed circle). Drag up/down to adjust
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radius of the rotator (the rolling circle). Size option
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adjusts the position of the virtual pen within the rotator.
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+ If "--nomagicsizes" is set, three versions each of
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epitrochoid and hypotrochoid drawing tools will be made
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available, each with differing pen positions.
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+ Code: Bill Kendrick <bill@newbreedsoftware.com>
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+ WIP - Needs icons
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+ WIP - Needs sounds
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* Improvements to "Text" & "Label" tools:
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---------------------------------------
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* The name and size of the chosen font is shown in the instructions
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499
magic/src/trochoids.c
Normal file
499
magic/src/trochoids.c
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@ -0,0 +1,499 @@
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/* trochoids.c
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Magic tools to draw various centered trochoids;
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similar to art generated by devices like the
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Spirograph and Wondergraph.
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by Bill Kendrick <bill@newbreedsoftware.com>
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January 6, 2024 - January 7, 2024
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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 "tp_magic_api.h"
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#include "SDL_image.h"
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#include "SDL_mixer.h"
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#define deg_cos(x) cos((float) (x) * M_PI / 180.0)
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#define deg_sin(x) sin((float) (x) * M_PI / 180.0)
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/* All _possible_ tools */
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enum
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{
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TOOL_EPITROCHOID_SIZES,
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TOOL_EPITROCHOID_NOSIZES_1,
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TOOL_EPITROCHOID_NOSIZES_2,
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TOOL_EPITROCHOID_NOSIZES_3,
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TOOL_HYPOTROCHOID_SIZES,
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TOOL_HYPOTROCHOID_NOSIZES_1,
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TOOL_HYPOTROCHOID_NOSIZES_2,
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TOOL_HYPOTROCHOID_NOSIZES_3,
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NUM_TOOLS
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};
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Uint8 tp_offers_sizes = 1;
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int num_tools[2] = {
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6, /* when sizes not available */
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2, /* when sizes available */
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};
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int * which_to_tool;
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int which_to_tool_per_size_availability[2][6] = {
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/* when sizes not available */
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{
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TOOL_EPITROCHOID_NOSIZES_1,
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TOOL_EPITROCHOID_NOSIZES_2,
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TOOL_EPITROCHOID_NOSIZES_3,
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TOOL_HYPOTROCHOID_NOSIZES_1,
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TOOL_HYPOTROCHOID_NOSIZES_2,
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TOOL_HYPOTROCHOID_NOSIZES_3,
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},
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/* when sizes available */
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{
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TOOL_EPITROCHOID_SIZES,
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TOOL_HYPOTROCHOID_SIZES,
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-1,
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-1,
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-1,
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-1,
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},
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};
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#define SIZE_WELLINSIDE 0.33
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#define SIZE_INSIDE 0.66
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#define SIZE_EDGE 1.00
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#define SIZE_OUTSIDE 1.50
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#define SIZE_WELLOUTSIDE 2.00
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#define NUM_SIZES 5
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float trochoids_sizes_per_size_setting[NUM_SIZES] = {
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SIZE_WELLINSIDE,
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SIZE_INSIDE,
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SIZE_EDGE,
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SIZE_OUTSIDE,
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SIZE_WELLOUTSIDE,
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};
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/* Default to "SIZE_EDGE" */
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#define DEFAULT_SIZE 3
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float trochoids_sizes_per_tool[NUM_TOOLS] = {
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0, // N/A; size controls available
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SIZE_INSIDE,
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SIZE_EDGE,
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SIZE_WELLOUTSIDE,
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0, // N/A; size controls available
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SIZE_INSIDE,
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SIZE_EDGE,
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SIZE_WELLOUTSIDE,
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};
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const char *icon_filenames[NUM_TOOLS] = {
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"1pt_persp_select.png", /* FIXME */
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"1pt_persp_select.png", /* FIXME */
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"1pt_persp_select.png", /* FIXME */
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"1pt_persp_select.png", /* FIXME */
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"1pt_persp_select.png", /* FIXME */
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"1pt_persp_select.png", /* FIXME */
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"1pt_persp_select.png", /* FIXME */
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"1pt_persp_select.png", /* FIXME */
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};
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const char *tool_names[NUM_TOOLS] = {
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gettext_noop("Epitrochoid"),
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gettext_noop("Epitrochoid 1"),
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gettext_noop("Epitrochoid 2"),
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gettext_noop("Epitrochoid 3"),
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gettext_noop("Hypotrochoid"),
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gettext_noop("Hypotrochoid 1"),
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gettext_noop("Hypotrochoid 2"),
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gettext_noop("Hypotrochoid 3"),
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};
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const char *tool_descriptions[NUM_TOOLS] = {
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/* Epitrochoids */
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gettext_noop("Click to start drawing an epitrochoid. Drag left/right to change the size of the fixed circle, and up/down to change the size of the circle rolling outside of it. Use the size option to change where the pen is."),
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gettext_noop("Click to start drawing an epitrochoid. Drag left/right to change the size of the fixed circle, and up/down to change the size of the circle rolling outside of it. Then pen is within the rolling circle."),
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gettext_noop("Click to start drawing an epitrochoid. Drag left/right to change the size of the fixed circle, and up/down to change the size of the circle rolling outside of it. Then pen is on the edge of the rolling circle."),
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gettext_noop("Click to start drawing an epitrochoid. Drag left/right to change the size of the fixed circle, and up/down to change the size of the circle rolling outside of it. Then pen is outside the rolling circle."),
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/* Hypotrochoids */
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gettext_noop("Click to start drawing a hypotrochoid. Drag left/right to change the size of the fixed circle, and up/down to change the size of the circle rolling inside it. Use the size option to change where the pen is."),
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gettext_noop("Click to start drawing a hypotrochoid. Drag left/right to change the size of the fixed circle, and up/down to change the size of the circle rolling inside it. Then pen is within the rolling circle."),
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gettext_noop("Click to start drawing a hypotrochoid. Drag left/right to change the size of the fixed circle, and up/down to change the size of the circle rolling inside it. Then pen is on the edge of the rolling circle."),
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gettext_noop("Click to start drawing a hypotrochoid. Drag left/right to change the size of the fixed circle, and up/down to change the size of the circle rolling inside it. Then pen is outside the rolling circle."),
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};
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/* Sound effects (same for everyone) */
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enum {
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SND_DRAW_CLICK,
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SND_DRAW_RELEASE,
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NUM_SNDS
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};
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Mix_Chunk *sound_effects[NUM_SNDS];
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const char *sound_filenames[NUM_SNDS] = {
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"n_pt_persp_click.ogg", // FIXME
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"n_pt_persp_release.ogg", // FIXME
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};
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Uint8 trochoids_size = 1;
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int trochoids_x, trochoids_y, dragged = 0;
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Uint32 trochoids_color = 0x00000000;
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int rotator_anim_a = 0;
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/* Function prototypes: */
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Uint32 trochoids_api_version(void);
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int trochoids_init(magic_api * api, Uint8 disabled_features, Uint8 complexity_level);
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int trochoids_get_tool_count(magic_api * api);
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SDL_Surface *trochoids_get_icon(magic_api * api, int which);
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char *trochoids_get_name(magic_api * api, int which);
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int trochoids_get_group(magic_api * api, int which);
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char *trochoids_get_description(magic_api * api, int which, int mode);
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int trochoids_requires_colors(magic_api * api, int which);
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int trochoids_modes(magic_api * api, int which);
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Uint8 trochoids_accepted_sizes(magic_api * api, int which, int mode);
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Uint8 trochoids_default_size(magic_api * api, int which, int mode);
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void trochoids_shutdown(magic_api * api);
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void trochoids_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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void trochoids_drag(magic_api * api, int which,
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SDL_Surface * canvas, SDL_Surface * snapshot,
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int old_x, int old_y, int x, int y,
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SDL_Rect * update_rect);
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void trochoids_work(magic_api * api, int which,
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SDL_Surface * canvas, SDL_Surface * snapshot,
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int x, int y, SDL_Rect * update_rect, int guides);
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void trochoids_release(magic_api * api, int which,
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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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void trochoids_set_color(magic_api * api, int which, SDL_Surface * canvas,
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SDL_Surface * snapshot, Uint8 r, Uint8 g, Uint8 b,
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SDL_Rect * update_rect);
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void trochoids_set_size(magic_api * api, int which, int mode,
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SDL_Surface * canvas, SDL_Surface * last,
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Uint8 size, SDL_Rect * update_rect);
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void trochoids_line_callback(void *pointer, int tool, SDL_Surface * canvas,
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SDL_Surface * snapshot, int x, int y);
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void trochoids_xorline_callback(void *pointer, int tool, SDL_Surface * canvas,
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SDL_Surface * snapshot, int x, int y);
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void trochoids_switchin(magic_api * api, int which, int mode,
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SDL_Surface * canvas);
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void trochoids_switchout(magic_api * api, int which, int mode,
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SDL_Surface * canvas);
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int calc_lcm(int a, int b);
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Uint32 trochoids_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 trochoids_init(magic_api * api, Uint8 disabled_features, Uint8 complexity_level ATTRIBUTE_UNUSED)
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{
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int i;
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char filename[1024];
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for (i = 0; i < NUM_SNDS; i++) {
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sound_effects[i] = NULL;
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}
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if (disabled_features & MAGIC_FEATURE_SIZE) {
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tp_offers_sizes = 0;
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} else {
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tp_offers_sizes = 1;
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}
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which_to_tool = which_to_tool_per_size_availability[tp_offers_sizes];
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for (i = 0; i < NUM_SNDS; i++)
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{
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snprintf(filename, sizeof(filename), "%s/sounds/magic/%s", api->data_directory,
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sound_filenames[i]);
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sound_effects[i] = Mix_LoadWAV(filename);
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}
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return (1);
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}
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int trochoids_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
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{
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return (num_tools[tp_offers_sizes]);
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}
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SDL_Surface *trochoids_get_icon(magic_api * api, int which)
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{
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char filename[1024];
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snprintf(filename, sizeof(filename), "%s/images/magic/%s",
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api->data_directory, icon_filenames[which_to_tool[which]]);
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return (IMG_Load(filename));
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}
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char *trochoids_get_name(magic_api * api ATTRIBUTE_UNUSED, int which)
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{
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return (strdup(gettext(tool_names[which_to_tool[which]])));
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}
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int trochoids_get_group(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
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{
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return (MAGIC_TYPE_ARTISTIC);
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}
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char *trochoids_get_description(magic_api * api ATTRIBUTE_UNUSED, int which, int mode ATTRIBUTE_UNUSED)
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{
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return (strdup(gettext(tool_descriptions[which_to_tool[which]])));
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}
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int trochoids_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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int trochoids_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 trochoids_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_SIZES;
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}
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Uint8 trochoids_default_size(magic_api * api ATTRIBUTE_UNUSED,
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int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
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{
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return DEFAULT_SIZE;
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}
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void trochoids_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_SNDS; i++) {
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if (sound_effects[i] != NULL) {
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Mix_FreeChunk(sound_effects[i]);
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}
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}
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}
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void trochoids_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
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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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trochoids_x = x;
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trochoids_y = y;
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trochoids_drag(api, which, canvas, snapshot, x, y, x + (canvas->w / 20), y + (canvas->h / 20), update_rect);
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dragged = 0;
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}
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/* Affect the canvas on drag: */
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void trochoids_drag(magic_api * api, int which,
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SDL_Surface * canvas, SDL_Surface * snapshot,
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int old_x ATTRIBUTE_UNUSED, int old_y ATTRIBUTE_UNUSED,
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int x, int y, SDL_Rect * update_rect)
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{
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dragged = 1;
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trochoids_work(api, which, canvas, snapshot, x, y, update_rect, 1);
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}
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void trochoids_work(magic_api * api, int which,
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SDL_Surface * canvas, SDL_Surface * snapshot,
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int x, int y, SDL_Rect * update_rect, int guides) {
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int R, r, d, LCM;
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int px, py, px2, py2;
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float a, r_ratio, size;
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which = which_to_tool[which];
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/* Drag left/rigth to change radius of stator (fixed circle) */
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R = abs(trochoids_x - x);
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if (R < 20) {
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R = 20;
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}
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R = (R / 10) * 10;
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/* Drag down to increase radius of rotator (rolling circle) */
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r = abs(y - trochoids_y);
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if (r < 10) {
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r = 10;
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}
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r = (r / 10) * 10;
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/* Epitrochoid: rotator is outside the stator;
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Hypotrochoid: rotator is inside the stator */
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if (which == TOOL_HYPOTROCHOID_SIZES ||
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which == TOOL_HYPOTROCHOID_NOSIZES_1 ||
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which == TOOL_HYPOTROCHOID_NOSIZES_2 ||
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which == TOOL_HYPOTROCHOID_NOSIZES_3) {
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r = -r - 2;
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}
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r_ratio = (float) (R + r) / (float) r;
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/* Size option (or use of alternate tools, if --nomagicsizes)
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determines the distance from the center of the rotator
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that the pen draws */
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if (tp_offers_sizes) {
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size = trochoids_sizes_per_size_setting[trochoids_size];
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} else {
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size = trochoids_sizes_per_tool[which];
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}
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d = r * size;
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/* Erase old before drawing new */
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/* FIXME */
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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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SDL_BlitSurface(snapshot, update_rect, canvas, update_rect);
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/* Draw the lines */
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LCM = calc_lcm(r, R);
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for (a = 0; a < 360.0 * (float) (LCM / R); a++) {
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float a2 = (a + 1);
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px = trochoids_x + (((R + r) * deg_cos(a)) + (d * deg_cos(r_ratio * a)));
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py = trochoids_y + (((R + r) * deg_sin(a)) - (d * deg_sin(r_ratio * a)));
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px2 = trochoids_x + (((R + r) * deg_cos((a2))) + (d * deg_cos(r_ratio * a2)));
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py2 = trochoids_y + (((R + r) * deg_sin((a2))) - (d * deg_sin(r_ratio * a2)));
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api->line((void *)api, which, canvas, snapshot, px, py, px2, py2, (20 * guides) + 1, trochoids_line_callback);
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}
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if (guides) {
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/* When still dragging (before release), draw some "guides",
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showing the mechanism that would be used to generate the pattern */
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rotator_anim_a = (int) (atan2(y - trochoids_y, x - trochoids_x) / M_PI * 180.0);
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for (a = 0; a < 360; a = a + 2) {
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/* Stator (fixed circle) */
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px = (int) ((float) trochoids_x + ((float) R * deg_cos(a)));
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py = (int) ((float) trochoids_y - ((float) R * deg_sin(a)));
|
||||
api->xorpixel(canvas, px, py);
|
||||
api->xorpixel(canvas, px + 1, py);
|
||||
api->xorpixel(canvas, px, py + 1);
|
||||
api->xorpixel(canvas, px + 1, py + 1);
|
||||
|
||||
/* Rotator (rolling circle) */
|
||||
px = (int) ((float) trochoids_x + ((R + r) * deg_cos(rotator_anim_a)) + ((float) r * deg_cos(a)));
|
||||
py = (int) ((float) trochoids_y + ((R + r) * deg_sin(rotator_anim_a)) - ((float) r * deg_sin(a)));
|
||||
api->xorpixel(canvas, px, py);
|
||||
api->xorpixel(canvas, px + 1, py);
|
||||
api->xorpixel(canvas, px, py + 1);
|
||||
api->xorpixel(canvas, px + 1, py + 1);
|
||||
|
||||
}
|
||||
px = (int) ((float) trochoids_x + ((R + r) * deg_cos(rotator_anim_a)) + ((float) d * deg_cos(0)));
|
||||
py = (int) ((float) trochoids_y + ((R + r) * deg_sin(rotator_anim_a)) - ((float) d * deg_sin(0)));
|
||||
for (int yy = -2; yy <= 2; yy++) {
|
||||
for (int xx = -2; xx <= 2; xx++) {
|
||||
api->putpixel(canvas, px + xx, py + yy, trochoids_color);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void trochoids_release(magic_api * api, int which,
|
||||
SDL_Surface * canvas, SDL_Surface * snapshot,
|
||||
int x, int y, SDL_Rect * update_rect)
|
||||
{
|
||||
if (dragged == 0) {
|
||||
x += (canvas->w / 20);
|
||||
y += (canvas->h / 20);
|
||||
}
|
||||
|
||||
trochoids_work(api, which, canvas, snapshot, x, y, update_rect, 0);
|
||||
}
|
||||
|
||||
|
||||
void trochoids_set_color(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
|
||||
SDL_Surface * canvas ATTRIBUTE_UNUSED,
|
||||
SDL_Surface * snapshot ATTRIBUTE_UNUSED,
|
||||
Uint8 r, Uint8 g, Uint8 b,
|
||||
SDL_Rect * update_rect ATTRIBUTE_UNUSED)
|
||||
{
|
||||
trochoids_color = SDL_MapRGB(canvas->format, r, g, b);
|
||||
}
|
||||
|
||||
|
||||
void trochoids_set_size(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
|
||||
SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * last ATTRIBUTE_UNUSED,
|
||||
Uint8 size, SDL_Rect * update_rect ATTRIBUTE_UNUSED)
|
||||
{
|
||||
trochoids_size = (size - 1); /* array index is 0-based, but Tux Paint returns between 1...{accepted sizes} */
|
||||
}
|
||||
|
||||
|
||||
void trochoids_line_callback(void *pointer ATTRIBUTE_UNUSED, int tool ATTRIBUTE_UNUSED,
|
||||
SDL_Surface * canvas, SDL_Surface * snapshot ATTRIBUTE_UNUSED,
|
||||
int x, int y)
|
||||
{
|
||||
magic_api *api = (magic_api *) pointer;
|
||||
|
||||
api->putpixel(canvas, x, y, trochoids_color);
|
||||
}
|
||||
|
||||
void trochoids_xorline_callback(void *pointer ATTRIBUTE_UNUSED, int tool ATTRIBUTE_UNUSED,
|
||||
SDL_Surface * canvas, SDL_Surface * snapshot ATTRIBUTE_UNUSED,
|
||||
int x, int y)
|
||||
{
|
||||
magic_api *api = (magic_api *) pointer;
|
||||
|
||||
api->xorpixel(canvas, x, y);
|
||||
api->xorpixel(canvas, x + 1, y);
|
||||
api->xorpixel(canvas, x, y + 1);
|
||||
api->xorpixel(canvas, x + 1, y + 1);
|
||||
}
|
||||
|
||||
void trochoids_switchin(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
|
||||
SDL_Surface * canvas ATTRIBUTE_UNUSED)
|
||||
{
|
||||
}
|
||||
|
||||
void trochoids_switchout(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
|
||||
SDL_Surface * canvas ATTRIBUTE_UNUSED)
|
||||
{
|
||||
}
|
||||
|
||||
int calc_lcm(int a, int b) {
|
||||
int max;
|
||||
|
||||
if (a > b) {
|
||||
max = a;
|
||||
} else {
|
||||
max = b;
|
||||
}
|
||||
|
||||
while ((max % a) != 0 || (max % b) != 0) {
|
||||
max++;
|
||||
}
|
||||
|
||||
return max;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue