src/display/snap-indicator.cpp

   1 /** \file
   2  * Provides a class that shows a temporary indicator on the canvas of where the snap was, and what kind of snap
   3  *
   4  * Authors:
   5  *   Johan Engelen
   6  *   Diederik van Lierop
   7  *
   8  * Copyright (C) Johan Engelen 2008 <j.b.c.engelen@utwente.nl>
   9  * Copyright (C) Diederik van Lierop 2008 <mail@diedenrezi.nl>
  10  *
  11  * Released under GNU GPL, read the file 'COPYING' for more information
  12  */
  13
  14 #include "display/snap-indicator.h"
  15
  16 #include "desktop.h"
  17 #include "desktop-handles.h"
  18 #include "display/sodipodi-ctrl.h"
  19 #include "knot.h"
  20 #include "preferences.h"
  21
  22 namespace Inkscape {
  23 namespace Display {
  24
  25 SnapIndicator::SnapIndicator(SPDesktop * desktop)
  26     :   _tempitem(NULL),
  27         _desktop(desktop)
  28 {
  29 }
  30
  31 SnapIndicator::~SnapIndicator()
  32 {
  33     // remove item that might be present
  34     remove_snappoint();
  35 }
  36
  37 void
  38 SnapIndicator::set_new_snappoint(Inkscape::SnappedPoint const p)
  39 {
  40     remove_snappoint();
  41
  42     g_assert(_desktop != NULL);
  43
  44     /* Commented out for now, because this might hide any snapping bug!
  45     if (!p.getSnapped()) {
  46        return; // If we haven't snapped, then it is of no use to draw a snapindicator
  47     }
  48     */
  49
  50     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
  51     bool value = prefs->getBool("/options/snapindicator/value", true);
  52
  53     if (value) {
  54         // TODO add many different kinds of snap indicator :-)
  55         // For this we should use p->getTarget() to find out what has snapped
  56         // and adjust the shape of the snapindicator accordingly, e.g. a cross
  57         // when snapping to an intersection, a circle when snapping to a node, etc.
  58         SPCanvasItem * canvasitem = sp_canvas_item_new( sp_desktop_tempgroup (_desktop),
  59                                                         SP_TYPE_CTRL,
  60                                                         "anchor", GTK_ANCHOR_CENTER,
  61                                                         "size", 10.0,
  62                                                         "stroked", TRUE,
  63                                                         "stroke_color", 0xf000f0ff,
  64                                                         "mode", SP_KNOT_MODE_XOR,
  65                                                         "shape", SP_KNOT_SHAPE_CROSS,
  66                                                         NULL );
  67
  68         SP_CTRL(canvasitem)->moveto(p.getPoint());
  69         _tempitem = _desktop->add_temporary_canvasitem(canvasitem, 1000); // TODO add preference for snap indicator timeout
  70     }
  71 }
  72
  73 void
  74 SnapIndicator::remove_snappoint()
  75 {
  76     if (_tempitem) {
  77         _desktop->remove_temporary_canvasitem(_tempitem);
  78         _tempitem = NULL;
  79     }
  80 }
  81
  82
  83 } //namespace Display
  84 } /* namespace Inkscape */
  85
  86 /*
  87   Local Variables:
  88   mode:c++
  89   c-file-style:"stroustrup"
  90   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  91   indent-tabs-mode:nil
  92   fill-column:99
  93   End:
  94 */
  95 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :