1 files changed, 262 insertions, 0 deletions
diff --git a/src/display/control/canvas-item-bpath.cpp b/src/display/control/canvas-item-bpath.cpp
new file mode 100644
index 0000000..6938ac5
--- /dev/null
+++ b/src/display/control/canvas-item-bpath.cpp
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * A class to represent a Bezier path.
+ */
+
+/*
+ * Author:
+ *   Tavmjong Bah
+ *
+ * Copyright (C) 2020 Tavmjong Bah
+ *
+ * Rewrite of SPCanvasBPath
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "canvas-item-bpath.h"
+
+#include <memory>  // unique_ptr
+#include <utility> // std::move
+
+#include "color.h" // SP_RGBA_x_F
+
+#include "display/curve.h"
+#include "display/cairo-utils.h"
+
+#include "helper/geom.h"  // bounds_exact_transformed()
+
+#include "ui/widget/canvas.h"
+
+namespace Inkscape {
+
+/**
+ * Create an null control bpath.
+ */
+CanvasItemBpath::CanvasItemBpath(CanvasItemGroup *group)
+    : CanvasItem(group)
+{
+    _name = "CanvasItemBpath:Null";
+    _pickable = true; // For now, nobody gets events from this class!
+}
+
+/**
+ * Create a control bpath. Curve is in document coordinates.
+ */
+CanvasItemBpath::CanvasItemBpath(CanvasItemGroup *group, SPCurve *curve, bool phantom_line)
+    : CanvasItem(group)
+    , _phantom_line(phantom_line)
+{
+    _name = "CanvasItemBpath";
+    _pickable = true; // For now, everyone gets events from this class!
+    if (curve) {
+        _path = curve->get_pathvector();
+    }
+
+    request_update(); // Render immediately or temporary bpaths won't show.
+}
+
+/**
+ * Create a control bpath. Path is in document coordinates.
+ */
+CanvasItemBpath::CanvasItemBpath(CanvasItemGroup *group, Geom::PathVector path, bool phantom_line)
+    : CanvasItem(group)
+    , _path(std::move(path))
+    , _phantom_line(phantom_line)
+{
+    _name = "CanvasItemBpath";
+    _pickable = true; // For now, everyone gets events from this class!
+    request_update(); // Render immediately or temporary bpaths won't show.
+}
+
+/**
+ * Set a control bpath. Curve is in document coordinates.
+ */
+void CanvasItemBpath::set_bpath(SPCurve *curve, bool phantom_line)
+{
+    if (curve) {   // No test to see if *curve == *_curve so we always do the swap.
+        _path = curve->get_pathvector();
+    } else {
+        _path.clear();
+    }
+
+    _phantom_line = phantom_line;
+
+    request_update();
+}
+
+/**
+ * Set a control bpath. Path is in document coordinates.
+ */
+void CanvasItemBpath::set_bpath(Geom::PathVector const &path, bool phantom_line)
+{
+    _path = path;
+    _phantom_line = phantom_line;
+
+    request_update();
+}
+
+/**
+ * Set the fill color and fill rule.
+ */
+void CanvasItemBpath::set_fill(guint rgba, SPWindRule fill_rule)
+{
+    if (_fill != rgba || _fill_rule != fill_rule) {
+        _fill = rgba;
+        _fill_rule = fill_rule;
+        request_redraw();
+    }
+}
+
+/**
+ * Returns distance between point in canvas units and nearest point on bpath.
+ */
+double CanvasItemBpath::closest_distance_to(Geom::Point const &p)
+{
+    double d = Geom::infinity();
+
+    // Convert p to document coordinates (quicker than converting path to canvas units).
+    Geom::Point p_doc = p * _affine.inverse();
+    _path.nearestTime(p_doc, &d);
+    d *= _affine.descrim(); // Uniform scaling and rotation only.
+
+    return d;
+}
+
+/**
+ * Returns true if point p (in canvas units) is within tolerance (canvas units) distance of bpath.
+ */
+bool CanvasItemBpath::contains(Geom::Point const &p, double tolerance)
+{
+    if (tolerance == 0) {
+        tolerance = 1; // Need a minimum tolerance value or always returns false.
+    }
+
+    return closest_distance_to(p) < tolerance;
+}
+
+/**
+ * Update and redraw control bpath.
+ */
+void CanvasItemBpath::update(Geom::Affine const &affine)
+{
+    if (_affine == affine && !_need_update) {
+        // Nothing to do.
+        return;
+    }
+
+    // Queue redraw of old area (erase previous content).
+    request_redraw();
+
+    // Get new bounds
+    _affine = affine;
+
+    _bounds = Geom::Rect(); // Reset bounds
+
+    if (_path.empty()) return; // No path, no chocolate!
+
+    Geom::OptRect bbox = bounds_exact_transformed(_path, _affine);
+
+    if (bbox) {
+        _bounds = *bbox;
+        _bounds.expandBy(2);
+    } else {
+        _bounds = Geom::Rect();
+    }
+
+    // Queue redraw of new area
+    request_redraw();
+
+    _need_update = false;
+}
+
+/**
+ * Render bpath to screen via Cairo.
+ */
+void CanvasItemBpath::render(Inkscape::CanvasItemBuffer *buf)
+{
+    if (!buf) {
+        std::cerr << "CanvasItemBpath::Render: No buffer!" << std::endl;
+         return;
+    }
+
+    if (!_visible) {
+        // Hidden
+        return;
+    }
+
+    if (_path.empty()) {
+        return;
+    }
+
+    bool do_fill   = (_fill   & 0xff) != 0; // Not invisible.
+    bool do_stroke = (_stroke & 0xff) != 0; // Not invisible.
+
+    if (!do_fill && !do_stroke) {
+        // Both fill and stroke invisible.
+        return;
+    }
+
+    buf->cr->save();
+
+    // Setup path
+    buf->cr->set_tolerance(0.5);
+    buf->cr->begin_new_path();
+
+    feed_pathvector_to_cairo (buf->cr->cobj(), _path, _affine, buf->rect,
+                              /* optimized_stroke = */ !do_fill, 1);
+
+    // Do fill
+    if (do_fill) {
+        buf->cr->set_source_rgba(SP_RGBA32_R_F(_fill), SP_RGBA32_G_F(_fill),
+                                 SP_RGBA32_B_F(_fill), SP_RGBA32_A_F(_fill));
+        buf->cr->set_fill_rule(_fill_rule == SP_WIND_RULE_EVENODD ?
+                               Cairo::FILL_RULE_EVEN_ODD : Cairo::FILL_RULE_WINDING);
+        buf->cr->fill_preserve();
+    }
+
+    // Do stroke
+    if (do_stroke) {
+
+        if (!_dashes.empty()) {
+            buf->cr->set_dash(_dashes, 0.0); // 0.0 is offset
+        }
+
+        if (_phantom_line) {
+            buf->cr->set_source_rgba(1.0, 1.0, 1.0, 0.25);
+            buf->cr->set_line_width(2.0);
+            buf->cr->stroke_preserve();
+        }
+
+        buf->cr->set_source_rgba(SP_RGBA32_R_F(_stroke), SP_RGBA32_G_F(_stroke),
+                                 SP_RGBA32_B_F(_stroke), SP_RGBA32_A_F(_stroke));
+        buf->cr->set_line_width(1.0);
+        buf->cr->stroke();
+
+    } else {
+        buf->cr->begin_new_path(); // Clears path
+    }
+
+    // Uncomment to show bounds
+    // Geom::Rect bounds = _bounds;
+    // bounds.expandBy(-1);
+    // bounds -= buf->rect.min();
+    // buf->cr->set_source_rgba(1.0, 0.0, 0.0, 1.0);
+    // buf->cr->rectangle(bounds.min().x(), bounds.min().y(), bounds.width(), bounds.height());
+    // buf->cr->stroke();
+
+    buf->cr->restore();
+}
+
+} // namespace Inkscape
+
+/*
+  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 :