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-rw-r--r--src/display/control/canvas-item-grid.cpp122
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diff --git a/src/display/control/canvas-item-grid.cpp b/src/display/control/canvas-item-grid.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * A class to represent a grid. All the magic happens elsewhere.
+ */
+
+/*
+ * Author:
+ * Tavmjong Bah
+ *
+ * Copyright (C) 2020 Tavmjong Bah
+ *
+ * Rewrite of GridCanvasItem.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "canvas-item-grid.h"
+
+#include "canvas-grid.h"
+
+#include "color.h" // SP_RGBA_x_F
+
+#include "ui/widget/canvas.h"
+
+namespace Inkscape {
+
+/**
+ * Create an null control grid.
+ */
+CanvasItemGrid::CanvasItemGrid(CanvasItemGroup *group, CanvasGrid *grid)
+ : CanvasItem(group)
+ , _grid(grid)
+{
+ _name = "CanvasItemGrid:";
+ _name += grid->getName(grid->getGridType());
+ _pickable = false; // For now, nobody gets events from this class!
+ _bounds = Geom::Rect(-Geom::infinity(), -Geom::infinity(), Geom::infinity(), Geom::infinity());
+
+ request_update(); // Update affine
+}
+
+/**
+ * Destructor: must remove ourself from the CanvasGrid's vector of CanvasItemGrids.
+ */
+CanvasItemGrid::~CanvasItemGrid()
+{
+ if (_grid) {
+ _grid->removeCanvasItem(this);
+ }
+}
+
+/**
+ * Returns distance between point in canvas units and nearest point on grid.
+ */
+double CanvasItemGrid::closest_distance_to(Geom::Point const &p)
+{
+ double d = Geom::infinity();
+ std::cerr << "CanvasItemGrid::closest_distance_to: Not implemented!" << std::endl;
+ return d;
+}
+
+/**
+ * Returns true if point p (in canvas units) is within tolerance (canvas units) distance of grid.
+ */
+bool CanvasItemGrid::contains(Geom::Point const &p, double tolerance)
+{
+ return false; // We're not pickable!
+}
+
+/**
+ * Update and redraw control grid.
+ */
+void CanvasItemGrid::update(Geom::Affine const &affine)
+{
+ if (_affine == affine && !_need_update) {
+ // Nothing to do.
+ return;
+ }
+
+ _affine = affine;
+ _grid->Update(affine, 0); // TODO: Remove flag (not used).
+ _need_update = false;
+
+ // Queue redraw of grid area
+ request_redraw();
+}
+
+/**
+ * Render grid to screen via Cairo.
+ */
+void CanvasItemGrid::render(Inkscape::CanvasItemBuffer *buf)
+{
+ if (!buf) {
+ std::cerr << "CanvasItemGrid::Render: No buffer!" << std::endl;
+ return;
+ }
+
+ if (!_visible) {
+ // Hidden
+ return;
+ }
+
+ if (!_grid->isVisible()) {
+ // Hidden: Grid code doesn't set CanvasItem::visible!
+ return;
+ }
+
+ _grid->Render(buf);
+}
+
+} // 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 :