b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define __SP_DYNA_DRAW_CONTEXT_C__

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define noDYNA_DRAW_VERBOSE

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen#include "config.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen#include <gtk/gtk.h>

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen#include <gdk/gdkkeysyms.h>

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "svg/svg.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "display/canvas-bpath.h"

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen#include "display/bezier-utils.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen#include "macros.h"

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen#include "document.h"

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen#include "selection.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "desktop.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "desktop-events.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "desktop-handles.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "desktop-affine.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "desktop-style.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "message-context.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "pixmaps/cursor-calligraphy.xpm"

79d46cc367c4181803d9a7a327b163643f23e8a7cilix#include "dyna-draw-context.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "libnr/n-art-bpath.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "libnr/nr-path.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "xml/repr.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#include "context-fns.h"

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen#include "sp-item.h"

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define DDC_RED_RGBA 0xff0000ff

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define DDC_GREEN_RGBA 0x000000ff

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define SAMPLE_TIMEOUT 10

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define TOLERANCE_LINE 1.0

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define TOLERANCE_CALLIGRAPHIC 3.0

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define DYNA_EPSILON 1.0e-6

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define DYNA_MIN_WIDTH 1.0e-6

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define DRAG_MIN 0.0

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define DRAG_DEFAULT 1.0

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix#define DRAG_MAX 1.0

620d9f76e90641a5a91f0c45fcb9a2f07b3881dbJohan Engelen

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);

99fae8b11f74e464ad0f55a7bfcc02933c4c1747johanengelenstatic void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);

99fae8b11f74e464ad0f55a7bfcc02933c4c1747johanengelenstatic void sp_dyna_draw_context_dispose(GObject *object);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void sp_dyna_draw_context_setup(SPEventContext *ec);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void clear_current(SPDynaDrawContext *dc);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void set_to_accumulated(SPDynaDrawContext *dc);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void concat_current_line(SPDynaDrawContext *dc);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void accumulate_calligraphic(SPDynaDrawContext *dc);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void fit_and_split(SPDynaDrawContext *ddc, gboolean release);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void fit_and_split_line(SPDynaDrawContext *ddc, gboolean release);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void fit_and_split_calligraphics(SPDynaDrawContext *ddc, gboolean release);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic NR::Point sp_dyna_draw_get_curr_vpoint(SPDynaDrawContext const *ddc);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void draw_temporary_box(SPDynaDrawContext *dc);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic SPEventContextClass *parent_class;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

7655c8b8ffe3674dd7e7c74f450fb7194943c0deJon A. Cruzsp_dyna_draw_context_get_type(void)

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen{

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen static GType type = 0;

7655c8b8ffe3674dd7e7c74f450fb7194943c0deJon A. Cruz if (!type) {

7655c8b8ffe3674dd7e7c74f450fb7194943c0deJon A. Cruz GTypeInfo info = {

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen sizeof(SPDynaDrawContextClass),

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix NULL, NULL,

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen (GClassInitFunc) sp_dyna_draw_context_class_init,

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen NULL, NULL,

7655c8b8ffe3674dd7e7c74f450fb7194943c0deJon A. Cruz sizeof(SPDynaDrawContext),

7655c8b8ffe3674dd7e7c74f450fb7194943c0deJon A. Cruz 4,

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen (GInstanceInitFunc) sp_dyna_draw_context_init,

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen NULL, /* value_table */

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen };

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0);

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen }

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix return type;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix}

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixsp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix{

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen GObjectClass *object_class = (GObjectClass *) klass;

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen SPEventContextClass *event_context_class = (SPEventContextClass *) klass;

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen

947fb2f89245c19c5bad9dbefb9fd44c2aaed2eccilix parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix object_class->dispose = sp_dyna_draw_context_dispose;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix event_context_class->setup = sp_dyna_draw_context_setup;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix event_context_class->set = sp_dyna_draw_context_set;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix event_context_class->root_handler = sp_dyna_draw_context_root_handler;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix}

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixsp_dyna_draw_context_init(SPDynaDrawContext *ddc)

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix{

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen SPEventContext *event_context = SP_EVENT_CONTEXT(ddc);

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen event_context->cursor_shape = cursor_calligraphy_xpm;

947fb2f89245c19c5bad9dbefb9fd44c2aaed2eccilix event_context->hot_x = 4;

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen event_context->hot_y = 4;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->accumulated = NULL;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->segments = NULL;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->currentcurve = NULL;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->currentshape = NULL;

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen ddc->npoints = 0;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->cal1 = NULL;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->cal2 = NULL;

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen ddc->repr = NULL;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix /* DynaDraw values */

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->cur = NR::Point(0,0);

5b20351508dc029f37f23fb7add6d0b43bf47f20johanengelen ddc->last = NR::Point(0,0);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->vel = NR::Point(0,0);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->acc = NR::Point(0,0);

3cfad782faf34c654ec837780ed7b3fe95e82c2eJohan B. C. Engelen ddc->ang = NR::Point(0,0);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->del = NR::Point(0,0);

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix /* attributes */

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->use_timeout = FALSE;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->use_calligraphic = TRUE;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->timer_id = 0;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->dragging = FALSE;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->dynahand = FALSE;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->mass = 0.3;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->drag = DRAG_DEFAULT;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->angle = 30.0;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->width = 0.2;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->vel_thin = 0.1;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix ddc->flatness = 0.9;

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix}

b320a8d186114a5122ddc3afbe95110eb6cb10cecilix

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixstatic void

b320a8d186114a5122ddc3afbe95110eb6cb10cecilixsp_dyna_draw_context_dispose(GObject *object)

{

SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);

if (ddc->accumulated) {

ddc->accumulated = sp_curve_unref(ddc->accumulated);

}

while (ddc->segments) {

gtk_object_destroy(GTK_OBJECT(ddc->segments->data));

ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data);

}

if (ddc->currentcurve) ddc->currentcurve = sp_curve_unref(ddc->currentcurve);

if (ddc->cal1) ddc->cal1 = sp_curve_unref(ddc->cal1);

if (ddc->cal2) ddc->cal2 = sp_curve_unref(ddc->cal2);

if (ddc->currentshape) {

gtk_object_destroy(GTK_OBJECT(ddc->currentshape));

ddc->currentshape = NULL;

}

if (ddc->_message_context) {

delete ddc->_message_context;

}

G_OBJECT_CLASS(parent_class)->dispose(object);

}

static void

sp_dyna_draw_context_setup(SPEventContext *ec)

{

SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);

if (((SPEventContextClass *) parent_class)->setup)

((SPEventContextClass *) parent_class)->setup(ec);

ddc->accumulated = sp_curve_new_sized(32);

ddc->currentcurve = sp_curve_new_sized(4);

ddc->cal1 = sp_curve_new_sized(32);

ddc->cal2 = sp_curve_new_sized(32);

/* style should be changed when dc->use_calligraphc is touched */

ddc->currentshape = sp_canvas_item_new(SP_DT_SKETCH(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);

sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);

sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);

/* fixme: Cannot we cascade it to root more clearly? */

g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);

sp_event_context_read(ec, "mass");

sp_event_context_read(ec, "drag");

sp_event_context_read(ec, "angle");

sp_event_context_read(ec, "width");

sp_event_context_read(ec, "thinning");

sp_event_context_read(ec, "flatness");

sp_event_context_read(ec, "usepressure");

sp_event_context_read(ec, "usetilt");

ddc->is_drawing = false;

ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());

}

static void

sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)

{

SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);

if (!strcmp(key, "mass")) {

double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );

ddc->mass = CLAMP(dval, -1000.0, 1000.0);

} else if (!strcmp(key, "drag")) {

double const dval = ( val ? g_ascii_strtod (val, NULL) : DRAG_DEFAULT );

ddc->drag = CLAMP(dval, DRAG_MIN, DRAG_MAX);

} else if (!strcmp(key, "angle")) {

double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);

ddc->angle = CLAMP (dval, -90, 90);

} else if (!strcmp(key, "width")) {

double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );

ddc->width = CLAMP(dval, -1000.0, 1000.0);

} else if (!strcmp(key, "thinning")) {

double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );

ddc->vel_thin = CLAMP(dval, -1.0, 1.0);

} else if (!strcmp(key, "flatness")) {

double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );

ddc->flatness = CLAMP(dval, 0, 1.0);

} else if (!strcmp(key, "usepressure")) {

ddc->usepressure = (val && strcmp(val, "0"));

} else if (!strcmp(key, "usetilt")) {

ddc->usetilt = (val && strcmp(val, "0"));

}

//g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);

}

static double

flerp(double f0, double f1, double p)

{

return f0 + ( f1 - f0 ) * p;

}

static NR::Point

sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)

{

NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();

double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );

return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max, ( v[NR::Y] - drect.min()[NR::Y] ) / max);

}

static NR::Point

sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)

{

NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();

double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );

return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);

}

static NR::Point sp_dyna_draw_get_curr_vpoint(SPDynaDrawContext const *dc)

{

NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();

double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );

return NR::Point(dc->cur[NR::X] * max + drect.min()[NR::X], dc->cur[NR::Y] * max + drect.min()[NR::Y]);

}

static void

sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)

{

dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);

dc->vel = NR::Point(0,0);

dc->acc = NR::Point(0,0);

dc->ang = NR::Point(0,0);

dc->del = NR::Point(0,0);

}

static void

sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)

{

if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))

dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);

else

dc->pressure = DDC_DEFAULT_PRESSURE;

if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))

dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);

else

dc->xtilt = DDC_DEFAULT_TILT;

if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))

dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);

else

dc->ytilt = DDC_DEFAULT_TILT;

}

static gboolean

sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)

{

NR::Point n = sp_dyna_draw_get_npoint(dc, p);

/* Calculate mass and drag */

double const mass = flerp(1.0, 160.0, dc->mass);

double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);

/* Calculate force and acceleration */

NR::Point force = n - dc->cur;

if ( NR::L2(force) < DYNA_EPSILON ) {

return FALSE;

}

dc->acc = force / mass;

/* Calculate new velocity */

dc->vel += dc->acc;

/* Calculate angle of drawing tool */

double a1;

if (dc->usetilt) {

// 1a. calculate nib angle from input device tilt:

gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;

if (length > 0) {

NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);

a1 = atan2(ang1);

}

else

a1 = 0.0;

}

else {

// 1b. fixed dc->angle (absolutely flat nib):

double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;

NR::Point ang1 = NR::Point(-sin(radians), cos(radians));

a1 = atan2(ang1);

}

// 2. perpendicular to dc->vel (absolutely non-flat nib):

gdouble const mag_vel = NR::L2(dc->vel);

if ( mag_vel < DYNA_EPSILON ) {

return FALSE;

}

NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;

// 3. Average them using flatness parameter:

// calculate angles

double a2 = atan2(ang2);

// flip a2 to force it to be in the same half-circle as a1

bool flipped = false;

if (fabs (a2-a1) > 0.5*M_PI) {

a2 += M_PI;

flipped = true;

}

// normalize a2

if (a2 > M_PI)

a2 -= 2*M_PI;

if (a2 < -M_PI)

a2 += 2*M_PI;

// find the flatness-weighted bisector angle, unflip if a2 was flipped

// FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?

double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);

// convert to point

dc->ang = NR::Point (cos (new_ang), sin (new_ang));

/* Apply drag */

dc->vel *= 1.0 - drag;

/* Update position */

dc->last = dc->cur;

dc->cur += dc->vel;

return TRUE;

}

static void

sp_dyna_draw_brush(SPDynaDrawContext *dc)

{

g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );

if (dc->use_calligraphic) {

/* calligraphics */

// How much velocity thins strokestyle

double vel_thin = flerp (0, 160, dc->vel_thin);

// Influence of pressure on thickness

double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);

double width = ( pressure_thick - vel_thin * NR::L2(dc->vel) ) * dc->width;

if ( width < 0.02 * dc->width ) {

width = 0.02 * dc->width;

}

NR::Point del = 0.05 * width * dc->ang;

dc->point1[dc->npoints] = sp_dyna_draw_get_vpoint(dc, dc->cur + del);

dc->point2[dc->npoints] = sp_dyna_draw_get_vpoint(dc, dc->cur - del);

dc->del = del;

} else {

dc->point1[dc->npoints] = sp_dyna_draw_get_curr_vpoint(dc);

}

dc->npoints++;

}

static gint

sp_dyna_draw_timeout_handler(gpointer data)

{

SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(data);

SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;

SPCanvas *canvas = SP_CANVAS(SP_DT_CANVAS(desktop));

dc->dragging = TRUE;

dc->dynahand = TRUE;

int x, y;

gtk_widget_get_pointer(GTK_WIDGET(canvas), &x, &y);

NR::Point p = sp_canvas_window_to_world(canvas, NR::Point(x, y));

p = desktop->w2d(p);

if (! sp_dyna_draw_apply(dc, p)) {

return TRUE;

}

if ( dc->cur != dc->last ) {

sp_dyna_draw_brush(dc);

g_assert( dc->npoints > 0 );

fit_and_split(dc, FALSE);

}

return TRUE;

}

sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)

{

desktop->setToolboxAdjustmentValue (id, value);

}

sp_dyna_draw_context_root_handler(SPEventContext *event_context,

GdkEvent *event)

{

SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);

SPDesktop *desktop = event_context->desktop;

gint ret = FALSE;

switch (event->type) {

case GDK_BUTTON_PRESS:

if ( event->button.button == 1 ) {

SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);

if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {

return TRUE;

}

NR::Point const button_w(event->button.x,

event->button.y);

NR::Point const button_dt(desktop->w2d(button_w));

sp_dyna_draw_reset(dc, button_dt);

sp_dyna_draw_extinput(dc, event);

sp_dyna_draw_apply(dc, button_dt);

sp_curve_reset(dc->accumulated);

if (dc->repr) {

dc->repr = NULL;

}

/* initialize first point */

dc->npoints = 0;

sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),

( dc->use_timeout

? ( GDK_KEY_PRESS_MASK |

GDK_BUTTON_RELEASE_MASK |

GDK_BUTTON_PRESS_MASK )

: ( GDK_KEY_PRESS_MASK |

GDK_BUTTON_RELEASE_MASK |

GDK_POINTER_MOTION_MASK |

GDK_BUTTON_PRESS_MASK ) ),

NULL,

event->button.time);

if ( dc->use_timeout && !dc->timer_id ) {

dc->timer_id = gtk_timeout_add(SAMPLE_TIMEOUT, sp_dyna_draw_timeout_handler, dc);

}

ret = TRUE;

dc->is_drawing = true;

}

break;

case GDK_MOTION_NOTIFY:

if ( dc->is_drawing && !dc->use_timeout && ( event->motion.state & GDK_BUTTON1_MASK ) ) {

dc->dragging = TRUE;

dc->dynahand = TRUE;

NR::Point const motion_w(event->motion.x,

event->motion.y);

NR::Point const motion_dt(desktop->w2d(motion_w));

sp_dyna_draw_extinput(dc, event);

if (!sp_dyna_draw_apply(dc, motion_dt)) {

ret = TRUE;

break;

}

if ( dc->cur != dc->last ) {

sp_dyna_draw_brush(dc);

g_assert( dc->npoints > 0 );

fit_and_split(dc, FALSE);

}

ret = TRUE;

}

break;

case GDK_BUTTON_RELEASE:

sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);

dc->is_drawing = false;

if ( event->button.button == 1

&& dc->use_timeout

&& dc->timer_id != 0 )

{

gtk_timeout_remove(dc->timer_id);

dc->timer_id = 0;

}

if ( dc->dragging && event->button.button == 1 ) {

dc->dragging = FALSE;

/* release */

if (dc->dynahand) {

dc->dynahand = FALSE;

/* Remove all temporary line segments */

while (dc->segments) {

gtk_object_destroy(GTK_OBJECT(dc->segments->data));

dc->segments = g_slist_remove(dc->segments, dc->segments->data);

}

/* Create object */

fit_and_split(dc, TRUE);

if (dc->use_calligraphic) {

accumulate_calligraphic(dc);

} else {

concat_current_line(dc);

}

set_to_accumulated(dc); /* temporal implementation */

if (dc->use_calligraphic /* || dc->cinside*/) {

/* reset accumulated curve */

sp_curve_reset(dc->accumulated);

clear_current(dc);

if (dc->repr) {

dc->repr = NULL;

}

}

}

ret = TRUE;

}

break;

case GDK_KEY_PRESS:

switch (get_group0_keyval (&event->key)) {

case GDK_Up:

case GDK_KP_Up:

if (!MOD__CTRL_ONLY) {

dc->angle += 5.0;

if (dc->angle > 90.0)

dc->angle = 90.0;

sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);

ret = TRUE;

}

break;

case GDK_Down:

case GDK_KP_Down:

if (!MOD__CTRL_ONLY) {

dc->angle -= 5.0;

if (dc->angle < -90.0)

dc->angle = -90.0;

sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);

ret = TRUE;

}

break;

case GDK_Right:

case GDK_KP_Right:

if (!MOD__CTRL_ONLY) {

dc->width += 0.01;

if (dc->width > 1.0)

dc->width = 1.0;

sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width); // the same spinbutton is for alt+x

ret = TRUE;

}

break;

case GDK_Left:

case GDK_KP_Left:

if (!MOD__CTRL_ONLY) {

dc->width -= 0.01;

if (dc->width < 0.01)

dc->width = 0.01;

sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width);

ret = TRUE;

}

break;

case GDK_x:

case GDK_X:

if (MOD__ALT_ONLY) {

desktop->setToolboxFocusTo ("altx-calligraphy");

ret = TRUE;

}

break;

case GDK_Escape:

SP_DT_SELECTION(desktop)->clear();

break;

default:

break;

}

default:

break;

}

if (!ret) {

if (((SPEventContextClass *) parent_class)->root_handler) {

ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);

}

}

return ret;

}

static void

clear_current(SPDynaDrawContext *dc)

{

/* reset bpath */

sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);

/* reset curve */

sp_curve_reset(dc->currentcurve);

sp_curve_reset(dc->cal1);

sp_curve_reset(dc->cal2);

/* reset points */

dc->npoints = 0;

}

static void

set_to_accumulated(SPDynaDrawContext *dc)

{

SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;

if (!sp_curve_empty(dc->accumulated)) {

NArtBpath *abp;

gchar *str;

if (!dc->repr) {

/* Create object */

Inkscape::XML::Node *repr = sp_repr_new("svg:path");

/* Set style */

sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);

dc->repr = repr;

SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));

Inkscape::GC::release(dc->repr);

item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());

item->updateRepr();

SP_DT_SELECTION(desktop)->set(dc->repr);

}

abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));

str = sp_svg_write_path(abp);

g_assert( str != NULL );

nr_free(abp);

dc->repr->setAttribute("d", str);

g_free(str);

} else {

if (dc->repr) {

sp_repr_unparent(dc->repr);

}

dc->repr = NULL;

}

sp_document_done(SP_DT_DOCUMENT(desktop));

}

static void

concat_current_line(SPDynaDrawContext *dc)

{

if (!sp_curve_empty(dc->currentcurve)) {

NArtBpath *bpath;

if (sp_curve_empty(dc->accumulated)) {

bpath = sp_curve_first_bpath(dc->currentcurve);

g_assert( bpath->code == NR_MOVETO_OPEN );

sp_curve_moveto(dc->accumulated, bpath->x3, bpath->y3);

}

bpath = sp_curve_last_bpath(dc->currentcurve);

if ( bpath->code == NR_CURVETO ) {

sp_curve_curveto(dc->accumulated,

bpath->x1, bpath->y1,

bpath->x2, bpath->y2,

bpath->x3, bpath->y3);

} else if ( bpath->code == NR_LINETO ) {

sp_curve_lineto(dc->accumulated, bpath->x3, bpath->y3);

} else {

g_assert_not_reached();

}

}

}

static void

accumulate_calligraphic(SPDynaDrawContext *dc)

{

if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {

sp_curve_reset(dc->accumulated); /* Is this required ?? */

SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);

sp_curve_append(dc->accumulated, dc->cal1, FALSE);

sp_curve_append(dc->accumulated, rev_cal2, TRUE);

sp_curve_closepath(dc->accumulated);

sp_curve_unref(rev_cal2);

sp_curve_reset(dc->cal1);

sp_curve_reset(dc->cal2);

}

}

static void

fit_and_split(SPDynaDrawContext *dc,

gboolean release)

{

if (dc->use_calligraphic) {

fit_and_split_calligraphics(dc, release);

} else {

fit_and_split_line(dc, release);

}

}

static double square(double const x)

{

return x * x;

}

static void

fit_and_split_line(SPDynaDrawContext *dc,

gboolean release)

{

double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_LINE );

NR::Point b[4];

double const n_segs = sp_bezier_fit_cubic(b, dc->point1, dc->npoints, tolerance_sq);

if ( n_segs > 0

&& dc->npoints < SAMPLING_SIZE )

{

/* Fit and draw and reset state */

#ifdef DYNA_DRAW_VERBOSE

g_print("%d", dc->npoints);

#endif

sp_curve_reset(dc->currentcurve);

sp_curve_moveto(dc->currentcurve, b[0]);

sp_curve_curveto(dc->currentcurve, b[1], b[2], b[3]);

sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);

} else {

/* Fit and draw and copy last point */

#ifdef DYNA_DRAW_VERBOSE

g_print("[%d]Yup\n", dc->npoints);

#endif

g_assert(!sp_curve_empty(dc->currentcurve));

concat_current_line(dc);

SPCanvasItem *cbp = sp_canvas_item_new(SP_DT_SKETCH(SP_EVENT_CONTEXT(dc)->desktop),

SP_TYPE_CANVAS_BPATH,

NULL);

SPCurve *curve = sp_curve_copy(dc->currentcurve);

sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cbp), curve);

sp_curve_unref(curve);

/* fixme: We have to parse style color somehow */

sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), DDC_GREEN_RGBA, SP_WIND_RULE_EVENODD);

sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x000000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);

/* fixme: Cannot we cascade it to root more clearly? */

g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);

dc->segments = g_slist_prepend(dc->segments, cbp);

dc->point1[0] = dc->point1[dc->npoints - 2];

dc->npoints = 1;

}

}

static void

fit_and_split_calligraphics(SPDynaDrawContext *dc, gboolean release)

{

double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );

#ifdef DYNA_DRAW_VERBOSE

g_print("[F&S:R=%c]", release?'T':'F');

#endif

if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))

return; // just clicked

if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {

#define BEZIER_SIZE 4

#define BEZIER_MAX_BEZIERS 8

#define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )

#ifdef DYNA_DRAW_VERBOSE

g_print("[F&S:#] dc->npoints:%d, release:%s\n",

dc->npoints, release ? "TRUE" : "FALSE");

#endif

/* Current calligraphic */

if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {

/* dc->npoints > 0 */

/* g_print("calligraphics(1|2) reset\n"); */

sp_curve_reset(dc->cal1);

sp_curve_reset(dc->cal2);

sp_curve_moveto(dc->cal1, dc->point1[0]);

sp_curve_moveto(dc->cal2, dc->point2[0]);

}

NR::Point b1[BEZIER_MAX_LENGTH];

gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,

tolerance_sq, BEZIER_MAX_BEZIERS);

g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );

NR::Point b2[BEZIER_MAX_LENGTH];

gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,

tolerance_sq, BEZIER_MAX_BEZIERS);

g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );

if ( nb1 != -1 && nb2 != -1 ) {

/* Fit and draw and reset state */

#ifdef DYNA_DRAW_VERBOSE

g_print("nb1:%d nb2:%d\n", nb1, nb2);

#endif

/* CanvasShape */

if (! release) {

sp_curve_reset(dc->currentcurve);

sp_curve_moveto(dc->currentcurve, b1[0]);

for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {

sp_curve_curveto(dc->currentcurve, bp1[1],

bp1[2], bp1[3]);

}

sp_curve_lineto(dc->currentcurve,

b2[BEZIER_SIZE*(nb2-1) + 3]);

for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {

sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);

}

sp_curve_closepath(dc->currentcurve);

sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);

}

/* Current calligraphic */

for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {

sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);

}

for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {

sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);

}

} else {

/* fixme: ??? */

#ifdef DYNA_DRAW_VERBOSE

g_print("[fit_and_split_calligraphics] failed to fit-cubic.\n");

#endif

draw_temporary_box(dc);

for (gint i = 1; i < dc->npoints; i++) {

sp_curve_lineto(dc->cal1, dc->point1[i]);

}

for (gint i = 1; i < dc->npoints; i++) {

sp_curve_lineto(dc->cal2, dc->point2[i]);

}

}

/* Fit and draw and copy last point */

#ifdef DYNA_DRAW_VERBOSE

g_print("[%d]Yup\n", dc->npoints);

#endif

if (!release) {

g_assert(!sp_curve_empty(dc->currentcurve));

SPCanvasItem *cbp = sp_canvas_item_new(SP_DT_SKETCH(SP_EVENT_CONTEXT(dc)->desktop),

SP_TYPE_CANVAS_BPATH,

NULL);

SPCurve *curve = sp_curve_copy(dc->currentcurve);

sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);

sp_curve_unref(curve);

sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), 0x000000ff, SP_WIND_RULE_EVENODD);

sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);

/* fixme: Cannot we cascade it to root more clearly? */

g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);

dc->segments = g_slist_prepend(dc->segments, cbp);

}

dc->point1[0] = dc->point1[dc->npoints - 1];

dc->point2[0] = dc->point2[dc->npoints - 1];

dc->npoints = 1;

} else {

draw_temporary_box(dc);

}

}

static void

draw_temporary_box(SPDynaDrawContext *dc)

{

sp_curve_reset(dc->currentcurve);

sp_curve_moveto(dc->currentcurve, dc->point1[0]);

for (gint i = 1; i < dc->npoints; i++) {

sp_curve_lineto(dc->currentcurve, dc->point1[i]);

}

for (gint i = dc->npoints-1; i >= 0; i--) {

sp_curve_lineto(dc->currentcurve, dc->point2[i]);

}

sp_curve_closepath(dc->currentcurve);

sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);

}