1 files changed, 122 insertions, 0 deletions
diff --git a/src/display/control/canvas-item-grid.cpp b/src/display/control/canvas-item-grid.cpp
new file mode 100644
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--- /dev/null
+++ b/src/display/control/canvas-item-grid.cpp
@@ -0,0 +1,122 @@
+// 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 :