1 files changed, 86 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..c6333b7
--- /dev/null
+++ b/src/ui/widget/ink-color-wheel.h
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Color wheel widget. Outer ring for Hue. Inner triangle for Saturation and Value.
+ *
+ * Copyright (C) 2018 Tavmjong Bah
+ *
+ * The contents of this file may be used under the GNU General Public License Version 2 or later.
+ *
+ */
+
+#ifndef INK_COLORWHEEL_H
+#define INK_COLORWHEEL_H
+
+/* Rewrite of the C Gimp ColorWheel which came originally from GTK2. */
+
+#include <gtkmm.h>
+#include <iostream>
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+  
+class ColorWheel : public Gtk::DrawingArea
+{
+public:
+    ColorWheel();
+    void set_rgb(const double& r, const double& g, const double& b, bool override_hue = true);
+    void get_rgb(double& r, double& g, double& b);
+    guint32 get_rgb();
+    bool is_adjusting() {return _mode != DRAG_NONE;}
+
+protected:
+    bool on_draw(const::Cairo::RefPtr<::Cairo::Context>& cr) override;
+
+private:
+    void triangle_corners(double& x0, double& y0,
+                          double& x1, double& y1,
+                          double& x2, double& y2);
+    void set_from_xy(const double& x, const double& y);
+    bool is_in_ring(    const double& x, const double& y);
+    bool is_in_triangle(const double& x, const double& y);
+
+    enum DragMode {
+        DRAG_NONE,
+        DRAG_H,
+        DRAG_SV
+    };
+
+    double _hue;  // Range [0,1)
+    double _saturation;
+    double _value;
+    double _ring_width;
+    DragMode _mode;
+    bool   _focus_on_ring;
+
+    // Callbacks
+    bool on_focus(Gtk::DirectionType direction) override;
+    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;
+
+    // Signals
+public:
+    sigc::signal<void> signal_color_changed();
+
+protected:
+    sigc::signal<void> _signal_color_changed;
+
+};
+
+} // Namespace Inkscape
+}
+}
+#endif // INK_COLOR_WHEEL_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:fileencoding=utf-8:textwidth=99 :