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 "inkscape.h"
  18 #include "desktop-handles.h"
  19 #include "rubberband.h"
  20 #include "display/canvas-bpath.h"
  21 #include "display/curve.h"
  22 #include "libnr/nr-point.h"
  23
  24 Inkscape::Rubberband *Inkscape::Rubberband::_instance = NULL;
  25
  26 Inkscape::Rubberband::Rubberband()
  27     : _desktop(SP_ACTIVE_DESKTOP), _rect(NULL), _touchpath(NULL), _started(false)
  28 {
  29     _points.clear();
  30     _mode = RUBBERBAND_MODE_RECT;
  31     _touchpath_curve = sp_curve_new_sized(2000);
  32 }
  33
  34 void Inkscape::Rubberband::delete_canvas_items()
  35 {
  36     if (_rect) {
  37         GtkObject *temp = _rect;
  38         _rect = NULL;
  39         gtk_object_destroy(temp);
  40     }
  41     if (_touchpath) {
  42         GtkObject *temp = _touchpath;
  43         _touchpath = NULL;
  44         gtk_object_destroy(temp);
  45     }
  46 }
  47
  48
  49 void Inkscape::Rubberband::start(SPDesktop *d, NR::Point const &p)
  50 {
  51     _points.clear();
  52     sp_curve_reset(_touchpath_curve);
  53     delete_canvas_items();
  54     _desktop = d;
  55     _start = p;
  56     _started = true;
  57     _points.push_back(_desktop->d2w(p));
  58     sp_curve_moveto(_touchpath_curve, p);
  59
  60     sp_canvas_force_full_redraw_after_interruptions(_desktop->canvas, 5);
  61 }
  62
  63 void Inkscape::Rubberband::stop()
  64 {
  65     _started = false;
  66     _mode = RUBBERBAND_MODE_RECT; // restore the default
  67
  68     _points.clear();
  69     sp_curve_reset(_touchpath_curve);
  70
  71     delete_canvas_items();
  72
  73     if (_desktop)
  74         sp_canvas_end_forced_full_redraws(_desktop->canvas);
  75 }
  76
  77 void Inkscape::Rubberband::move(NR::Point const &p)
  78 {
  79     if (!_started)
  80         return;
  81
  82     _end = p;
  83     _desktop->scroll_to_point(&p);
  84     sp_curve_lineto (_touchpath_curve, p);
  85
  86     NR::Point next = _desktop->d2w(p);
  87     // we want the points to be at most 0.5 screen pixels apart,
  88     // so that we don't lose anything small;
  89     // if they are farther apart, we interpolate more points
  90     if (_points.size() > 0 && NR::L2(next-_points.back()) > 0.5) {
  91         NR::Point prev = _points.back();
  92         int subdiv = 2 * (int) round(NR::L2(next-prev) + 0.5);
  93         for (int i = 1; i <= subdiv; i ++) {
  94             _points.push_back(prev + ((double)i/subdiv) * (next - prev));
  95         }
  96     } else {
  97         _points.push_back(next);
  98     }
  99
 100     if (_mode == RUBBERBAND_MODE_RECT) {
 101         if (_rect == NULL) {
 102             _rect = static_cast<CtrlRect *>(sp_canvas_item_new(sp_desktop_controls(_desktop), SP_TYPE_CTRLRECT, NULL));
 103         }
 104         _rect->setRectangle(NR::Rect(_start, _end));
 105
 106         sp_canvas_item_show(_rect);
 107         if (_touchpath)
 108             sp_canvas_item_hide(_touchpath);
 109
 110     } else if (_mode == RUBBERBAND_MODE_TOUCHPATH) {
 111         if (_touchpath == NULL) {
 112             _touchpath = sp_canvas_bpath_new(sp_desktop_sketch(_desktop), NULL);
 113             sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(_touchpath), 0xff0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 114             sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(_touchpath), 0, SP_WIND_RULE_NONZERO);
 115         }
 116         sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(_touchpath), _touchpath_curve);
 117
 118         sp_canvas_item_show(_touchpath);
 119         if (_rect)
 120             sp_canvas_item_hide(_rect);
 121     }
 122 }
 123
 124 void Inkscape::Rubberband::setMode(int mode)
 125 {
 126     _mode = mode;
 127 }
 128
 129 NR::Maybe<NR::Rect> Inkscape::Rubberband::getRectangle() const
 130 {
 131     if (!_started) {
 132         return NR::Nothing();
 133     }
 134
 135     return NR::Rect(_start, _end);
 136 }
 137
 138 Inkscape::Rubberband *Inkscape::Rubberband::get()
 139 {
 140     if (_instance == NULL) {
 141         _instance = new Inkscape::Rubberband;
 142     }
 143
 144     return _instance;
 145 }
 146
 147 bool Inkscape::Rubberband::is_started()
 148 {
 149     return _started;
 150 }
 151
 152 /*
 153   Local Variables:
 154   mode:c++
 155   c-file-style:"stroustrup"
 156   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 157   indent-tabs-mode:nil
 158   fill-column:99
 159   End:
 160 */
 161 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :