1 files changed, 152 insertions, 0 deletions
diff --git a/src/ui/widget/ink-color-wheel.h b/src/ui/widget/ink-color-wheel.h
new file mode 100644
index 0000000..57af896
--- /dev/null
+++ b/src/ui/widget/ink-color-wheel.h
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * @file
+ * HSLuv color wheel widget, based on the web implementation at
+ * https://www.hsluv.org
+ *
+ * Authors:
+ *   Tavmjong Bah
+ *   Massinissa Derriche <massinissa.derriche@gmail.com>
+ *
+ * Copyright (C) 2018, 2021 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INK_COLORWHEEL_H
+#define INK_COLORWHEEL_H
+
+#include <gtkmm.h>
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+struct PickerGeometry;
+
+/**
+ * @class ColorWheel
+ */
+class ColorWheel : public Gtk::DrawingArea
+{
+public:
+    ColorWheel();
+
+    virtual void setRgb(double r, double g, double b, bool overrideHue = true);
+    virtual void getRgb(double *r, double *g, double *b) const;
+    virtual void getRgbV(double *rgb) const;
+    virtual guint32 getRgb() const;
+
+    void setHue(double h);
+    void setSaturation(double s);
+    virtual void setLightness(double l);
+    void getValues(double *a, double *b, double *c) const;
+
+    bool isAdjusting() const { return _adjusting; }
+
+protected:
+    virtual void _set_from_xy(double const x, double const y);
+
+    double _values[3];
+    bool _adjusting;
+
+private:
+    // Callbacks
+    bool on_key_release_event(GdkEventKey* key_event) override;
+
+    // Signals
+public:
+    sigc::signal<void> signal_color_changed();
+
+protected:
+    sigc::signal<void> _signal_color_changed;
+};
+
+/**
+ * @class ColorWheelHSL
+ */
+class ColorWheelHSL : public ColorWheel
+{
+public:
+    void setRgb(double r, double g, double b, bool overrideHue = true) override;
+    void getRgb(double *r, double *g, double *b) const override;
+    void getRgbV(double *rgb) const override;
+    guint32 getRgb() const override;
+
+    void getHsl(double *h, double *s, double *l) const;
+
+protected:
+    bool on_draw(const::Cairo::RefPtr<::Cairo::Context>& cr) override;
+    bool on_focus(Gtk::DirectionType direction) override;
+
+private:
+    void _set_from_xy(double const x, double const y) override;
+    bool _is_in_ring(double x, double y);
+    bool _is_in_triangle(double x, double y);
+    void _update_triangle_color(double x, double y);
+    void _update_ring_color(double x, double y);
+    void _triangle_corners(double& x0, double& y0, double& x1, double& y1, double& x2,
+            double& y2);
+
+    enum class DragMode {
+        NONE,
+        HUE,
+        SATURATION_VALUE
+    };
+
+    double _ring_width = 0.2;
+    DragMode _mode = DragMode::NONE;
+    bool _focus_on_ring = true;
+
+    // Callbacks
+    bool on_button_press_event(GdkEventButton* event) override;
+    bool on_button_release_event(GdkEventButton* event) override;
+    bool on_motion_notify_event(GdkEventMotion* event) override;
+    bool on_key_press_event(GdkEventKey* key_event) override;
+};
+
+/**
+ * @class ColorWheelHSLuv
+ */
+class ColorWheelHSLuv : public ColorWheel
+{
+public:
+    ColorWheelHSLuv();
+    ~ColorWheelHSLuv() override;
+
+    void setRgb(double r, double g, double b, bool overrideHue = true) override;
+    void getRgb(double *r, double *g, double *b) const override;
+    void getRgbV(double *rgb) const override;
+    guint32 getRgb() const override;
+
+    void setHsluv(double h, double s, double l);
+    void setLightness(double l) override;
+
+    void getHsluv(double *h, double *s, double *l) const;
+
+protected:
+    bool on_draw(const::Cairo::RefPtr<::Cairo::Context>& cr) override;
+
+private:
+    void _set_from_xy(double const x, double const y) override;
+    void _update_polygon();
+
+    // Callbacks
+    bool on_button_press_event(GdkEventButton* event) override;
+    bool on_button_release_event(GdkEventButton* event) override;
+    bool on_motion_notify_event(GdkEventMotion* event) override;
+    bool on_key_press_event(GdkEventKey* key_event) override;
+
+    double _scale;
+    PickerGeometry *_picker_geometry;
+    std::vector<guint32> _buffer_polygon;
+    Cairo::RefPtr<::Cairo::ImageSurface> _surface_polygon;
+    int _cache_width, _cache_height;
+    int _square_size;
+};
+
+} // namespace Widget
+} // namespace UI
+} // namespace Inkscape
+
+#endif // INK_COLORWHEEL_HSLUV_H