1 files changed, 123 insertions, 0 deletions
diff --git a/src/display/control/canvas-item-grid.h b/src/display/control/canvas-item-grid.h
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+++ b/src/display/control/canvas-item-grid.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Author:
+ *   Tavmjong Bah
+ *
+ * Copyright (C) 2020 Tavmjong Bah
+ *
+ * Rewrite of GridCanvasItem.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#ifndef SEEN_CANVAS_ITEM_GRID_H
+#define SEEN_CANVAS_ITEM_GRID_H
+
+#include <cstdint>
+#include <2geom/point.h>
+
+#include "canvas-item.h"
+#include "preferences.h"
+
+uint32_t constexpr GRID_DEFAULT_MAJOR_COLOR = 0x0099e54d;
+uint32_t constexpr GRID_DEFAULT_MINOR_COLOR = 0x0099e526;
+
+namespace Inkscape {
+
+class CanvasItemGrid : public CanvasItem
+{
+public:
+    CanvasItemGrid(CanvasItemGroup *group);
+
+    // Selection
+    bool contains(Geom::Point const &p, double tolerance = 0) override;
+
+    // Properties
+    void set_major_color(uint32_t color);
+    void set_minor_color(uint32_t color);
+    void set_origin(Geom::Point const &point);
+    void set_spacing(Geom::Point const &point);
+    void set_dotted(bool b);
+    void set_major_line_interval(int n);
+    void set_no_emp_when_zoomed_out(bool noemp);
+
+protected:
+    ~CanvasItemGrid() override = default;
+
+    bool _dotted;
+
+    Geom::Point _origin;
+
+    Geom::Point _spacing; /**< Spacing between elements of the grid */
+
+    int _major_line_interval;
+    bool _no_emp_when_zoomed_out;
+    uint32_t _major_color;
+    uint32_t _minor_color;
+
+private:
+    std::unique_ptr<Preferences::PreferencesObserver> _pref_tracker;
+};
+
+/** Canvas Item for rectangular grids */
+class CanvasItemGridXY final : public CanvasItemGrid
+{
+public:
+    CanvasItemGridXY(CanvasItemGroup *group);
+
+protected:
+    friend class GridSnapperXY;
+
+    void _update(bool propagate) override;
+    void _render(CanvasItemBuffer &buf) const override;
+
+    bool scaled[2];    /**< Whether the grid is in scaled mode, which can
+                            be different in the X or Y direction, hence two
+                            variables */
+    Geom::Point ow;      /**< Transformed origin by the affine for the zoom */
+    Geom::Point sw[2];   /**< Transformed spacing by the affine for the zoom */
+};
+
+/** Canvas Item for axonometric grids */
+class CanvasItemGridAxonom final : public CanvasItemGrid
+{
+public:
+    CanvasItemGridAxonom(CanvasItemGroup *group);
+
+    // Properties
+    void set_angle_x(double value);
+    void set_angle_z(double value);
+
+protected:
+    friend class GridSnapperAxonom;
+
+    void _update(bool propagate) override;
+    void _render(CanvasItemBuffer &buf) const override;
+
+    bool scaled;          /**< Whether the grid is in scaled mode */
+
+    double angle_deg[3];  /**< Angle of each axis (note that angle[2] == 0) */
+    double angle_rad[3];  /**< Angle of each axis (note that angle[2] == 0) */
+    double tan_angle[3];  /**< tan(angle[.]) */
+
+    double lyw   = 1.0;     /**< Transformed length y by the affine for the zoom */
+    double lxw_x = 1.0;
+    double lxw_z = 1.0;
+    double spacing_ylines = 1.0;
+
+    Geom::Point ow;         /**< Transformed origin by the affine for the zoom */
+};
+
+} // namespace Inkscape
+
+#endif // SEEN_CANVAS_ITEM_GRID_H
+
+/*
+  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 :