1 files changed, 165 insertions, 0 deletions
diff --git a/src/rubberband.cpp b/src/rubberband.cpp
new file mode 100644
index 0000000..3519ee8
--- /dev/null
+++ b/src/rubberband.cpp
@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Rubberbanding selector.
+ *
+ * Author:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "display/sodipodi-ctrlrect.h"
+#include "desktop.h"
+
+#include "rubberband.h"
+#include "display/sp-canvas.h"
+#include "display/canvas-bpath.h"
+#include "display/curve.h"
+
+Inkscape::Rubberband *Inkscape::Rubberband::_instance = nullptr;
+
+Inkscape::Rubberband::Rubberband(SPDesktop *dt)
+    : _desktop(dt), _rect(nullptr), _touchpath(nullptr), _started(false)
+{
+    _points.clear();
+    _mode = RUBBERBAND_MODE_RECT;
+    _touchpath_curve = new SPCurve();
+}
+
+void Inkscape::Rubberband::delete_canvas_items()
+{
+    if (_rect) {
+        SPCanvasItem *temp = _rect;
+        _rect = nullptr;
+        sp_canvas_item_destroy(temp);
+    }
+    if (_touchpath) {
+        SPCanvasItem *temp = _touchpath;
+        _touchpath = nullptr;
+        sp_canvas_item_destroy(temp);
+    }
+}
+
+
+void Inkscape::Rubberband::start(SPDesktop *d, Geom::Point const &p)
+{
+    _points.clear();
+    _touchpath_curve->reset();
+    delete_canvas_items();
+    _desktop = d;
+    _start = p;
+    _started = true;
+    _points.push_back(_desktop->d2w(p));
+    _touchpath_curve->moveto(p);
+
+    _desktop->canvas->forceFullRedrawAfterInterruptions(5);
+}
+
+void Inkscape::Rubberband::stop()
+{
+    _started = false;
+    _mode = RUBBERBAND_MODE_RECT; // restore the default
+
+    _points.clear();
+    _touchpath_curve->reset();
+
+    delete_canvas_items();
+
+    if (_desktop) {
+        _desktop->canvas->endForcedFullRedraws();
+    }
+}
+
+void Inkscape::Rubberband::move(Geom::Point const &p)
+{
+    if (!_started) 
+        return;
+
+    _end = p;
+    _desktop->scroll_to_point(p);
+    _touchpath_curve->lineto(p);
+
+    Geom::Point next = _desktop->d2w(p);
+    // we want the points to be at most 0.5 screen pixels apart,
+    // so that we don't lose anything small;
+    // if they are farther apart, we interpolate more points
+    if (!_points.empty() && Geom::L2(next-_points.back()) > 0.5) {
+        Geom::Point prev = _points.back();
+        int subdiv = 2 * (int) round(Geom::L2(next-prev) + 0.5);
+        for (int i = 1; i <= subdiv; i ++) {
+            _points.push_back(prev + ((double)i/subdiv) * (next - prev));
+        }
+    } else {
+        _points.push_back(next);
+    }
+
+    if (_mode == RUBBERBAND_MODE_RECT) {
+        if (_rect == nullptr) {
+            _rect = static_cast<CtrlRect *>(sp_canvas_item_new(_desktop->getControls(), SP_TYPE_CTRLRECT, nullptr));
+            _rect->setColor(0x808080ff, false, 0x0);
+            _rect->setInvert(true);
+        }
+        _rect->setRectangle(Geom::Rect(_start, _end));
+
+        sp_canvas_item_show(_rect);
+        if (_touchpath)
+            sp_canvas_item_hide(_touchpath);
+
+    } else if (_mode == RUBBERBAND_MODE_TOUCHPATH) {
+        if (_touchpath == nullptr) {
+            _touchpath = sp_canvas_bpath_new(_desktop->getSketch(), nullptr);
+            sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(_touchpath), 0xff0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
+            sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(_touchpath), 0, SP_WIND_RULE_NONZERO);
+        }
+        sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(_touchpath), _touchpath_curve);
+
+        sp_canvas_item_show(_touchpath);
+        if (_rect)
+            sp_canvas_item_hide(_rect);
+    }
+}
+
+void Inkscape::Rubberband::setMode(int mode) 
+{
+    _mode = mode;
+}
+
+/**
+ * @return Rectangle in desktop coordinates
+ */
+Geom::OptRect Inkscape::Rubberband::getRectangle() const
+{
+    if (!_started) {
+        return Geom::OptRect();
+    }
+
+    return Geom::Rect(_start, _end);
+}
+
+Inkscape::Rubberband *Inkscape::Rubberband::get(SPDesktop *desktop)
+{
+    if (_instance == nullptr) {
+        _instance = new Inkscape::Rubberband(desktop);
+    }
+
+    return _instance;
+}
+
+bool Inkscape::Rubberband::is_started()
+{
+    return _started;
+}
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :