src/rubberband.cpp

   1 #define __RUBBERBAND_C__
   2
   3 /**
   4  * \file src/rubberband.cpp
   5  * \brief Rubberbanding selector
   6  *
   7  * Author:
   8  *   Lauris Kaplinski <lauris@kaplinski.com>
   9  *
  10  * Copyright (C) 1999-2002 Lauris Kaplinski
  11  *
  12  * Released under GNU GPL, read the file 'COPYING' for more information
  13  */
  14
  15 #include "display/sodipodi-ctrlrect.h"
  16 #include "desktop.h"
  17 #include "desktop-handles.h"
  18 #include "rubberband.h"
  19 #include "display/canvas-bpath.h"
  20 #include "display/curve.h"
  21 #include "libnr/nr-point.h"
  22
  23 Inkscape::Rubberband *Inkscape::Rubberband::_instance = NULL;
  24
  25 Inkscape::Rubberband::Rubberband(SPDesktop *dt)
  26     : _desktop(dt), _rect(NULL), _touchpath(NULL), _started(false)
  27 {
  28     _points.clear();
  29     _mode = RUBBERBAND_MODE_RECT;
  30     _touchpath_curve = new SPCurve();
  31 }
  32
  33 void Inkscape::Rubberband::delete_canvas_items()
  34 {
  35     if (_rect) {
  36         GtkObject *temp = _rect;
  37         _rect = NULL;
  38         gtk_object_destroy(temp);
  39     }
  40     if (_touchpath) {
  41         GtkObject *temp = _touchpath;
  42         _touchpath = NULL;
  43         gtk_object_destroy(temp);
  44     }
  45 }
  46
  47
  48 void Inkscape::Rubberband::start(SPDesktop *d, NR::Point const &p)
  49 {
  50     _points.clear();
  51     _touchpath_curve->reset();
  52     delete_canvas_items();
  53     _desktop = d;
  54     _start = p;
  55     _started = true;
  56     _points.push_back(_desktop->d2w(p));
  57     _touchpath_curve->moveto(p);
  58
  59     sp_canvas_force_full_redraw_after_interruptions(_desktop->canvas, 5);
  60 }
  61
  62 void Inkscape::Rubberband::stop()
  63 {
  64     _started = false;
  65     _mode = RUBBERBAND_MODE_RECT; // restore the default
  66
  67     _points.clear();
  68     _touchpath_curve->reset();
  69
  70     delete_canvas_items();
  71
  72     if (_desktop)
  73         sp_canvas_end_forced_full_redraws(_desktop->canvas);
  74 }
  75
  76 void Inkscape::Rubberband::move(NR::Point const &p)
  77 {
  78     if (!_started)
  79         return;
  80
  81     _end = p;
  82     _desktop->scroll_to_point(&p);
  83     _touchpath_curve->lineto(p);
  84
  85     NR::Point next = _desktop->d2w(p);
  86     // we want the points to be at most 0.5 screen pixels apart,
  87     // so that we don't lose anything small;
  88     // if they are farther apart, we interpolate more points
  89     if (_points.size() > 0 && NR::L2(next-_points.back()) > 0.5) {
  90         NR::Point prev = _points.back();
  91         int subdiv = 2 * (int) round(NR::L2(next-prev) + 0.5);
  92         for (int i = 1; i <= subdiv; i ++) {
  93             _points.push_back(prev + ((double)i/subdiv) * (next - prev));
  94         }
  95     } else {
  96         _points.push_back(next);
  97     }
  98
  99     if (_mode == RUBBERBAND_MODE_RECT) {
 100         if (_rect == NULL) {
 101             _rect = static_cast<CtrlRect *>(sp_canvas_item_new(sp_desktop_controls(_desktop), SP_TYPE_CTRLRECT, NULL));
 102         }
 103         _rect->setRectangle(NR::Rect(_start, _end));
 104
 105         sp_canvas_item_show(_rect);
 106         if (_touchpath)
 107             sp_canvas_item_hide(_touchpath);
 108
 109     } else if (_mode == RUBBERBAND_MODE_TOUCHPATH) {
 110         if (_touchpath == NULL) {
 111             _touchpath = sp_canvas_bpath_new(sp_desktop_sketch(_desktop), NULL);
 112             sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(_touchpath), 0xff0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 113             sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(_touchpath), 0, SP_WIND_RULE_NONZERO);
 114         }
 115         sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(_touchpath), _touchpath_curve);
 116
 117         sp_canvas_item_show(_touchpath);
 118         if (_rect)
 119             sp_canvas_item_hide(_rect);
 120     }
 121 }
 122
 123 void Inkscape::Rubberband::setMode(int mode)
 124 {
 125     _mode = mode;
 126 }
 127
 128 boost::optional<NR::Rect> Inkscape::Rubberband::getRectangle() const
 129 {
 130     if (!_started) {
 131         return boost::optional<NR::Rect>();
 132     }
 133
 134     return NR::Rect(_start, _end);
 135 }
 136
 137 Inkscape::Rubberband *Inkscape::Rubberband::get(SPDesktop *desktop)
 138 {
 139     if (_instance == NULL) {
 140         _instance = new Inkscape::Rubberband(desktop);
 141     }
 142
 143     return _instance;
 144 }
 145
 146 bool Inkscape::Rubberband::is_started()
 147 {
 148     return _started;
 149 }
 150
 151 /*
 152   Local Variables:
 153   mode:c++
 154   c-file-style:"stroustrup"
 155   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 156   indent-tabs-mode:nil
 157   fill-column:99
 158   End:
 159 */
 160 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :