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     :   _snaptarget(NULL),
  27         _snapsource(NULL),
  28         _desktop(desktop)
  29 {
  30 }
  31
  32 SnapIndicator::~SnapIndicator()
  33 {
  34     // remove item that might be present
  35         remove_snaptarget();
  36         remove_snapsource();
  37 }
  38
  39 void
  40 SnapIndicator::set_new_snaptarget(Inkscape::SnappedPoint const p)
  41 {
  42         remove_snaptarget();
  43
  44     g_assert(_desktop != NULL);
  45
  46     /* Commented out for now, because this might hide any snapping bug!
  47     if (!p.getSnapped()) {
  48        return; // If we haven't snapped, then it is of no use to draw a snapindicator
  49     }
  50     */
  51
  52     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
  53     bool value = prefs->getBool("/options/snapindicator/value", true);
  54
  55     if (value) {
  56         SPCanvasItem * canvasitem = NULL;
  57         switch (p.getTarget()) {
  58             /// @todo  add the different kinds of snapindicator visuals
  59             case SNAPTARGET_NODE:
  60                 canvasitem = sp_canvas_item_new(sp_desktop_tempgroup (_desktop),
  61                                                 SP_TYPE_CTRL,
  62                                                 "anchor", GTK_ANCHOR_CENTER,
  63                                                 "size", 10.0,
  64                                                 "stroked", TRUE,
  65                                                 "stroke_color", 0xf000f0ff,
  66                                                 "mode", SP_KNOT_MODE_XOR,
  67                                                 "shape", SP_KNOT_SHAPE_DIAMOND,
  68                                                 NULL );
  69                 break;
  70             case SNAPTARGET_GRID:
  71             case SNAPTARGET_GRID_INTERSECTION:
  72             case SNAPTARGET_GUIDE:
  73             case SNAPTARGET_GUIDE_INTERSECTION:
  74             case SNAPTARGET_GRID_GUIDE_INTERSECTION:
  75             case SNAPTARGET_PATH:
  76             case SNAPTARGET_PATH_INTERSECTION:
  77             case SNAPTARGET_BBOX_CORNER:
  78             case SNAPTARGET_BBOX_EDGE:
  79             case SNAPTARGET_GRADIENT:
  80             case SNAPTARGET_UNDEFINED:
  81             default:
  82                 canvasitem = sp_canvas_item_new(sp_desktop_tempgroup (_desktop),
  83                                                 SP_TYPE_CTRL,
  84                                                 "anchor", GTK_ANCHOR_CENTER,
  85                                                 "size", 10.0,
  86                                                 "stroked", TRUE,
  87                                                 "stroke_color", 0xf000f0ff,
  88                                                 "mode", SP_KNOT_MODE_XOR,
  89                                                 "shape", SP_KNOT_SHAPE_CROSS,
  90                                                 NULL );
  91                 break;
  92         }
  93
  94         SP_CTRL(canvasitem)->moveto(p.getPoint());
  95         remove_snapsource(); // Don't set both the source and target indicators, as these will overlap
  96         _snaptarget = _desktop->add_temporary_canvasitem(canvasitem, 1000); // TODO add preference for snap indicator timeout
  97     }
  98 }
  99
 100 void
 101 SnapIndicator::remove_snaptarget()
 102 {
 103     if (_snaptarget) {
 104         _desktop->remove_temporary_canvasitem(_snaptarget);
 105         _snaptarget = NULL;
 106     }
 107 }
 108
 109 void
 110 SnapIndicator::set_new_snapsource(Geom::Point const p)
 111 {
 112         remove_snapsource();
 113
 114     g_assert(_desktop != NULL);
 115
 116     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 117     bool value = prefs->getBool("/options/snapindicator/value", true);
 118
 119     if (value) {
 120         SPCanvasItem * canvasitem = sp_canvas_item_new( sp_desktop_tempgroup (_desktop),
 121                                                         SP_TYPE_CTRL,
 122                                                         "anchor", GTK_ANCHOR_CENTER,
 123                                                         "size", 10.0,
 124                                                         "stroked", TRUE,
 125                                                         "stroke_color", 0xf000f0ff,
 126                                                         "mode", SP_KNOT_MODE_XOR,
 127                                                         "shape", SP_KNOT_SHAPE_CIRCLE,
 128                                                         NULL );
 129
 130         SP_CTRL(canvasitem)->moveto(p);
 131         _snapsource = _desktop->add_temporary_canvasitem(canvasitem, 1000);
 132     }
 133 }
 134
 135 void
 136 SnapIndicator::remove_snapsource()
 137 {
 138     if (_snapsource) {
 139         _desktop->remove_temporary_canvasitem(_snapsource);
 140         _snapsource = NULL;
 141     }
 142 }
 143
 144
 145
 146 } //namespace Display
 147 } /* namespace Inkscape */
 148
 149 /*
 150   Local Variables:
 151   mode:c++
 152   c-file-style:"stroustrup"
 153   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 154   indent-tabs-mode:nil
 155   fill-column:99
 156   End:
 157 */
 158 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :