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