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Diffstat (limited to 'src/dyna-draw-context.cpp')
| -rw-r--r-- | src/dyna-draw-context.cpp | 958 |
1 files changed, 958 insertions, 0 deletions
diff --git a/src/dyna-draw-context.cpp b/src/dyna-draw-context.cpp new file mode 100644 index 000000000..8b90ce034 --- /dev/null +++ b/src/dyna-draw-context.cpp @@ -0,0 +1,958 @@ +#define __SP_DYNA_DRAW_CONTEXT_C__ + +/* + * Handwriting-like drawing mode + * + * Authors: + * Mitsuru Oka <oka326@parkcity.ne.jp> + * Lauris Kaplinski <lauris@kaplinski.com> + * bulia byak <buliabyak@users.sf.net> + * + * The original dynadraw code: + * Paul Haeberli <paul@sgi.com> + * + * Copyright (C) 1998 The Free Software Foundation + * Copyright (C) 1999-2005 authors + * Copyright (C) 2001-2002 Ximian, Inc. + * + * Released under GNU GPL, read the file 'COPYING' for more information + */ + +/* + * TODO: Tue Oct 2 22:57:15 2001 + * - Decide control point behavior when use_calligraphic==1. + * - Decide to use NORMALIZED_COORDINATE or not. + * - Bug fix. + */ + +#define noDYNA_DRAW_VERBOSE + +#include "config.h" + +#include <gtk/gtk.h> +#include <gdk/gdkkeysyms.h> + +#include "svg/svg.h" +#include "display/canvas-bpath.h" +#include "display/bezier-utils.h" + +#include "macros.h" +#include "document.h" +#include "selection.h" +#include "desktop.h" +#include "desktop-events.h" +#include "desktop-handles.h" +#include "desktop-affine.h" +#include "desktop-style.h" +#include "message-context.h" +#include "pixmaps/cursor-calligraphy.xpm" +#include "dyna-draw-context.h" +#include "libnr/n-art-bpath.h" +#include "libnr/nr-path.h" +#include "xml/repr.h" +#include "context-fns.h" +#include "sp-item.h" + +#define DDC_RED_RGBA 0xff0000ff +#define DDC_GREEN_RGBA 0x000000ff + +#define SAMPLE_TIMEOUT 10 +#define TOLERANCE_LINE 1.0 +#define TOLERANCE_CALLIGRAPHIC 3.0 +#define DYNA_EPSILON 1.0e-6 + +#define DYNA_MIN_WIDTH 1.0e-6 + +#define DRAG_MIN 0.0 +#define DRAG_DEFAULT 1.0 +#define DRAG_MAX 1.0 + +static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass); +static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc); +static void sp_dyna_draw_context_dispose(GObject *object); + +static void sp_dyna_draw_context_setup(SPEventContext *ec); +static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val); +static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event); + +static void clear_current(SPDynaDrawContext *dc); +static void set_to_accumulated(SPDynaDrawContext *dc); +static void concat_current_line(SPDynaDrawContext *dc); +static void accumulate_calligraphic(SPDynaDrawContext *dc); + +static void fit_and_split(SPDynaDrawContext *ddc, gboolean release); +static void fit_and_split_line(SPDynaDrawContext *ddc, gboolean release); +static void fit_and_split_calligraphics(SPDynaDrawContext *ddc, gboolean release); + +static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p); +static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v); +static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n); +static NR::Point sp_dyna_draw_get_curr_vpoint(SPDynaDrawContext const *ddc); +static void draw_temporary_box(SPDynaDrawContext *dc); + + +static SPEventContextClass *parent_class; + +GtkType +sp_dyna_draw_context_get_type(void) +{ + static GType type = 0; + if (!type) { + GTypeInfo info = { + sizeof(SPDynaDrawContextClass), + NULL, NULL, + (GClassInitFunc) sp_dyna_draw_context_class_init, + NULL, NULL, + sizeof(SPDynaDrawContext), + 4, + (GInstanceInitFunc) sp_dyna_draw_context_init, + NULL, /* value_table */ + }; + type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0); + } + return type; +} + +static void +sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass) +{ + GObjectClass *object_class = (GObjectClass *) klass; + SPEventContextClass *event_context_class = (SPEventContextClass *) klass; + + parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass); + + object_class->dispose = sp_dyna_draw_context_dispose; + + event_context_class->setup = sp_dyna_draw_context_setup; + event_context_class->set = sp_dyna_draw_context_set; + event_context_class->root_handler = sp_dyna_draw_context_root_handler; +} + +static void +sp_dyna_draw_context_init(SPDynaDrawContext *ddc) +{ + SPEventContext *event_context = SP_EVENT_CONTEXT(ddc); + + event_context->cursor_shape = cursor_calligraphy_xpm; + event_context->hot_x = 4; + event_context->hot_y = 4; + + ddc->accumulated = NULL; + ddc->segments = NULL; + ddc->currentcurve = NULL; + ddc->currentshape = NULL; + ddc->npoints = 0; + ddc->cal1 = NULL; + ddc->cal2 = NULL; + ddc->repr = NULL; + + /* DynaDraw values */ + ddc->cur = NR::Point(0,0); + ddc->last = NR::Point(0,0); + ddc->vel = NR::Point(0,0); + ddc->acc = NR::Point(0,0); + ddc->ang = NR::Point(0,0); + ddc->del = NR::Point(0,0); + + /* attributes */ + ddc->use_timeout = FALSE; + ddc->use_calligraphic = TRUE; + ddc->timer_id = 0; + ddc->dragging = FALSE; + ddc->dynahand = FALSE; + + ddc->mass = 0.3; + ddc->drag = DRAG_DEFAULT; + ddc->angle = 30.0; + ddc->width = 0.2; + + ddc->vel_thin = 0.1; + ddc->flatness = 0.9; +} + +static void +sp_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; +} + +/* Get normalized point */ +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); +} + +/* Get view point */ +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]); +} + +/* Get current view point */ +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; +} + +void +sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value) +{ + desktop->setToolboxAdjustmentValue (id, value); +} + +gint +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); +} + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 : |