moving trunk for module inkscape

(bzr r1)

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 :