diff options
Diffstat (limited to 'src/spiral-context.cpp')
| -rw-r--r-- | src/spiral-context.cpp | 473 |
1 files changed, 473 insertions, 0 deletions
diff --git a/src/spiral-context.cpp b/src/spiral-context.cpp new file mode 100644 index 000000000..c1640d427 --- /dev/null +++ b/src/spiral-context.cpp @@ -0,0 +1,473 @@ +#define __SP_SPIRAL_CONTEXT_C__ + +/* + * Spiral drawing context + * + * Authors: + * Mitsuru Oka + * Lauris Kaplinski <lauris@kaplinski.com> + * bulia byak <buliabyak@users.sf.net> + * + * Copyright (C) 1999-2001 Lauris Kaplinski + * Copyright (C) 2001-2002 Mitsuru Oka + * + * Released under GNU GPL + */ + +#include "config.h" + +#include <gdk/gdkkeysyms.h> + +#include "macros.h" +#include "display/sp-canvas.h" +#include "sp-spiral.h" +#include "document.h" +#include "sp-namedview.h" +#include "selection.h" +#include "desktop-handles.h" +#include "desktop-affine.h" +#include "snap.h" +#include "desktop.h" +#include "desktop-style.h" +#include "message-context.h" +#include "pixmaps/cursor-spiral.xpm" +#include "spiral-context.h" +#include "sp-metrics.h" +#include <glibmm/i18n.h> +#include "object-edit.h" +#include "xml/repr.h" +#include "xml/node-event-vector.h" +#include "prefs-utils.h" +#include "context-fns.h" + +static void sp_spiral_context_class_init(SPSpiralContextClass * klass); +static void sp_spiral_context_init(SPSpiralContext *spiral_context); +static void sp_spiral_context_dispose(GObject *object); +static void sp_spiral_context_setup(SPEventContext *ec); +static void sp_spiral_context_set(SPEventContext *ec, gchar const *key, gchar const *val); + +static gint sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event); + +static void sp_spiral_drag(SPSpiralContext *sc, NR::Point p, guint state); +static void sp_spiral_finish(SPSpiralContext *sc); + +static SPEventContextClass *parent_class; + +GtkType +sp_spiral_context_get_type() +{ + static GType type = 0; + if (!type) { + GTypeInfo info = { + sizeof(SPSpiralContextClass), + NULL, NULL, + (GClassInitFunc) sp_spiral_context_class_init, + NULL, NULL, + sizeof(SPSpiralContext), + 4, + (GInstanceInitFunc) sp_spiral_context_init, + NULL, /* value_table */ + }; + type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSpiralContext", &info, (GTypeFlags)0); + } + return type; +} + +static void +sp_spiral_context_class_init(SPSpiralContextClass *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_spiral_context_dispose; + + event_context_class->setup = sp_spiral_context_setup; + event_context_class->set = sp_spiral_context_set; + event_context_class->root_handler = sp_spiral_context_root_handler; +} + +static void +sp_spiral_context_init(SPSpiralContext *spiral_context) +{ + SPEventContext *event_context = SP_EVENT_CONTEXT(spiral_context); + + event_context->cursor_shape = cursor_spiral_xpm; + event_context->hot_x = 4; + event_context->hot_y = 4; + event_context->xp = 0; + event_context->yp = 0; + event_context->tolerance = 0; + event_context->within_tolerance = false; + event_context->item_to_select = NULL; + + event_context->shape_repr = NULL; + event_context->shape_knot_holder = NULL; + + spiral_context->item = NULL; + + spiral_context->revo = 3.0; + spiral_context->exp = 1.0; + spiral_context->t0 = 0.0; + + new (&spiral_context->sel_changed_connection) sigc::connection(); +} + +static void +sp_spiral_context_dispose(GObject *object) +{ + SPSpiralContext *sc = SP_SPIRAL_CONTEXT(object); + SPEventContext *ec = SP_EVENT_CONTEXT(object); + + ec->enableGrDrag(false); + + sc->sel_changed_connection.disconnect(); + sc->sel_changed_connection.~connection(); + + /* fixme: This is necessary because we do not grab */ + if (sc->item) sp_spiral_finish(sc); + + if (ec->shape_knot_holder) { + sp_knot_holder_destroy(ec->shape_knot_holder); + ec->shape_knot_holder = NULL; + } + + if (ec->shape_repr) { // remove old listener + sp_repr_remove_listener_by_data(ec->shape_repr, ec); + Inkscape::GC::release(ec->shape_repr); + ec->shape_repr = 0; + } + + if (sc->_message_context) { + delete sc->_message_context; + } + + G_OBJECT_CLASS(parent_class)->dispose(object); +} + +static Inkscape::XML::NodeEventVector ec_shape_repr_events = { + NULL, /* child_added */ + NULL, /* child_removed */ + ec_shape_event_attr_changed, + NULL, /* content_changed */ + NULL /* order_changed */ +}; + +/** +\brief Callback that processes the "changed" signal on the selection; +destroys old and creates new knotholder +*/ +void +sp_spiral_context_selection_changed(Inkscape::Selection *selection, gpointer data) +{ + SPSpiralContext *sc = SP_SPIRAL_CONTEXT(data); + SPEventContext *ec = SP_EVENT_CONTEXT(sc); + + if (ec->shape_knot_holder) { // desktroy knotholder + sp_knot_holder_destroy(ec->shape_knot_holder); + ec->shape_knot_holder = NULL; + } + + if (ec->shape_repr) { // remove old listener + sp_repr_remove_listener_by_data(ec->shape_repr, ec); + Inkscape::GC::release(ec->shape_repr); + ec->shape_repr = 0; + } + + SPItem *item = selection->singleItem(); + if (item) { + ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop); + Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item); + if (shape_repr) { + ec->shape_repr = shape_repr; + Inkscape::GC::anchor(shape_repr); + sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec); + sp_repr_synthesize_events(shape_repr, &ec_shape_repr_events, ec); + } + } +} + +static void +sp_spiral_context_setup(SPEventContext *ec) +{ + SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec); + + if (((SPEventContextClass *) parent_class)->setup) + ((SPEventContextClass *) parent_class)->setup(ec); + + sp_event_context_read(ec, "expansion"); + sp_event_context_read(ec, "revolution"); + sp_event_context_read(ec, "t0"); + + Inkscape::Selection *selection = SP_DT_SELECTION(ec->desktop); + + SPItem *item = selection->singleItem(); + if (item) { + ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop); + Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item); + if (shape_repr) { + ec->shape_repr = shape_repr; + Inkscape::GC::anchor(shape_repr); + sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec); + sp_repr_synthesize_events(shape_repr, &ec_shape_repr_events, ec); + } + } + + sc->sel_changed_connection.disconnect(); + sc->sel_changed_connection = selection->connectChanged(sigc::bind(sigc::ptr_fun(&sp_spiral_context_selection_changed), (gpointer)sc)); + + if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) { + ec->enableSelectionCue(); + } + + if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) { + ec->enableGrDrag(); + } + + sc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack()); +} + +static void +sp_spiral_context_set(SPEventContext *ec, gchar const *key, gchar const *val) +{ + SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec); + + if (!strcmp(key, "expansion")) { + sc->exp = (val) ? g_ascii_strtod(val, NULL) : 1.0; + sc->exp = CLAMP(sc->exp, 0.0, 1000.0); + } else if (!strcmp(key, "revolution")) { + sc->revo = (val) ? g_ascii_strtod(val, NULL) : 3.0; + sc->revo = CLAMP(sc->revo, 0.05, 40.0); + } else if (!strcmp(key, "t0")) { + sc->t0 = (val) ? g_ascii_strtod(val, NULL) : 0.0; + sc->t0 = CLAMP(sc->t0, 0.0, 0.999); + } +} + +static gint +sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event) +{ + static gboolean dragging; + + SPDesktop *desktop = event_context->desktop; + Inkscape::Selection *selection = SP_DT_SELECTION (desktop); + SPSpiralContext *sc = SP_SPIRAL_CONTEXT(event_context); + + event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100); + + gint ret = FALSE; + + switch (event->type) { + case GDK_BUTTON_PRESS: + if (event->button.button == 1) { + + dragging = TRUE; + sc->center = Inkscape::setup_for_drag_start(desktop, event_context, event); + + SnapManager const m(desktop->namedview); + sc->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, sc->center, sc->item).getPoint(); + + sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate), + ( GDK_KEY_PRESS_MASK | + GDK_BUTTON_RELEASE_MASK | + GDK_POINTER_MOTION_MASK | + GDK_BUTTON_PRESS_MASK ), + NULL, event->button.time); + ret = TRUE; + } + break; + case GDK_MOTION_NOTIFY: + if (dragging && event->motion.state && GDK_BUTTON1_MASK) { + + if ( event_context->within_tolerance + && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance ) + && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) { + break; // do not drag if we're within tolerance from origin + } + // Once the user has moved farther than tolerance from the original location + // (indicating they intend to draw, not click), then always process the + // motion notify coordinates as given (no snapping back to origin) + event_context->within_tolerance = false; + + NR::Point const motion_w(event->motion.x, event->motion.y); + NR::Point const motion_dt(event_context->desktop->w2d(motion_w)); + sp_spiral_drag(sc, motion_dt, event->motion.state); + ret = TRUE; + } + break; + case GDK_BUTTON_RELEASE: + event_context->xp = event_context->yp = 0; + if (event->button.button == 1) { + dragging = FALSE; + if (!event_context->within_tolerance) { + // we've been dragging, finish the spiral + sp_spiral_finish(sc); + } else if (event_context->item_to_select) { + // no dragging, select clicked item if any + if (event->button.state & GDK_SHIFT_MASK) { + selection->toggle(event_context->item_to_select); + } else { + selection->set(event_context->item_to_select); + } + } else { + // click in an empty space + selection->clear(); + } + + event_context->item_to_select = NULL; + ret = TRUE; + sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time); + } + break; + case GDK_KEY_PRESS: + switch (get_group0_keyval(&event->key)) { + case GDK_Alt_R: + case GDK_Control_L: + case GDK_Control_R: + case GDK_Shift_L: + case GDK_Shift_R: + case GDK_Meta_L: // Meta is when you press Shift+Alt (at least on my machine) + case GDK_Meta_R: + sp_event_show_modifier_tip(event_context->defaultMessageContext(), event, + _("<b>Ctrl</b>: snap angle"), + NULL, + _("<b>Alt</b>: lock spiral radius")); + break; + case GDK_Up: + case GDK_Down: + case GDK_KP_Up: + case GDK_KP_Down: + // prevent the zoom field from activation + if (!MOD__CTRL_ONLY) + ret = TRUE; + break; + case GDK_x: + case GDK_X: + if (MOD__ALT_ONLY) { + desktop->setToolboxFocusTo ("altx-spiral"); + ret = TRUE; + } + break; + case GDK_Escape: + SP_DT_SELECTION(desktop)->clear(); + //TODO: make dragging escapable by Esc + default: + break; + } + break; + case GDK_KEY_RELEASE: + switch (get_group0_keyval(&event->key)) { + case GDK_Alt_L: + case GDK_Alt_R: + case GDK_Control_L: + case GDK_Control_R: + case GDK_Shift_L: + case GDK_Shift_R: + case GDK_Meta_L: // Meta is when you press Shift+Alt + case GDK_Meta_R: + event_context->defaultMessageContext()->clear(); + break; + default: + break; + } + break; + default: + break; + } + + if (!ret) { + if (((SPEventContextClass *) parent_class)->root_handler) + ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event); + } + + return ret; +} + +static void +sp_spiral_drag(SPSpiralContext *sc, NR::Point p, guint state) +{ + SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop; + + int const snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12); + + if (!sc->item) { + + if (Inkscape::have_viable_layer(desktop, sc->_message_context) == false) { + return; + } + + /* Create object */ + Inkscape::XML::Node *repr = sp_repr_new("svg:path"); + repr->setAttribute("sodipodi:type", "spiral"); + + /* Set style */ + sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.spiral", false); + + sc->item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr); + Inkscape::GC::release(repr); + sc->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer()); + sc->item->updateRepr(); + } + + NR::Point const p0 = sp_desktop_dt2root_xy_point(desktop, sc->center); + NR::Point p1 = sp_desktop_dt2root_xy_point(desktop, p); + SnapManager const m(desktop->namedview); + p1 = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p1, sc->item).getPoint(); + + SPSpiral *spiral = SP_SPIRAL(sc->item); + + NR::Point const delta = p1 - p0; + gdouble const rad = NR::L2(delta); + + gdouble arg = NR::atan2(delta) - 2.0*M_PI*spiral->revo; + + if (state & GDK_CONTROL_MASK) { + arg = sp_round(arg, M_PI/snaps); + } + + /* Fixme: these parameters should be got from dialog box */ + sp_spiral_position_set(spiral, p0[NR::X], p0[NR::Y], + /*expansion*/ sc->exp, + /*revolution*/ sc->revo, + rad, arg, + /*t0*/ sc->t0); + + /* status text */ + GString *rads = SP_PX_TO_METRIC_STRING(rad, desktop->namedview->getDefaultMetric()); + sc->_message_context->setF(Inkscape::NORMAL_MESSAGE, + _("<b>Spiral</b>: radius %s, angle %5g°; with <b>Ctrl</b> to snap angle"), + rads->str, sp_round((arg + 2.0*M_PI*spiral->revo)*180/M_PI, 0.0001)); + g_string_free(rads, FALSE); +} + +static void +sp_spiral_finish(SPSpiralContext *sc) +{ + sc->_message_context->clear(); + + if (sc->item != NULL) { + SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop; + SPSpiral *spiral = SP_SPIRAL(sc->item); + + sp_shape_set_shape(SP_SHAPE(spiral)); + SP_OBJECT(spiral)->updateRepr(NULL, SP_OBJECT_WRITE_EXT); + + SP_DT_SELECTION(desktop)->set(sc->item); + sp_document_done(SP_DT_DOCUMENT(desktop)); + + sc->item = NULL; + } +} + + +/* + 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 : |