/*
NanoGUI was developed by Wenzel Jakob <wenzel.jakob@epfl.ch>.
The widget drawing code is based on the NanoVG demo application
by Mikko Mononen.
All rights reserved. Use of this source code is governed by a
BSD-style license that can be found in the LICENSE.txt file.
*/
#pragma once
#include <nanogui/widget.h>
NAMESPACE_BEGIN(nanogui)
class NANOGUI_EXPORT ColorWheel : public Widget {
public:
ColorWheel(Widget *parent, const Color& color = Color(1.0f, 0.0f, 0.0f, 1.0f));
std::function<void(const Color &)> callback() const { return mCallback; }
void setCallback(const std::function<void(const Color &)> &callback) { mCallback = callback; }
Color color() const;
void setColor(const Color& color);
virtual Vector2i preferredSize(NVGcontext *ctx) const override;
virtual void draw(NVGcontext *ctx) override;
virtual bool mouseButtonEvent(const Vector2i &p, int button, bool down, int modifiers) override;
virtual bool mouseDragEvent(const Vector2i &p, const Vector2i &rel, int button, int modifiers) override;
virtual void save(Serializer &s) const override;
virtual bool load(Serializer &s) override;
private:
// Used to describe where the mouse is interacting
enum Region {
None = 0,
InnerTriangle = 1,
OuterCircle = 2,
Both = 3
};
// Converts a specified hue (with saturation = value = 1) to RGB space.
Color hue2rgb(float h) const;
// Manipulates the positioning of the different regions of the ColorWheel.
Region adjustPosition(const Vector2i &p, Region consideredRegions = Both);
protected:
float mHue;
float mWhite;
float mBlack;
Region mDragRegion;
std::function<void(const Color &)> mCallback;
public:
EIGEN_MAKE_ALIGNED_OPERATOR_NEW
};
NAMESPACE_END(nanogui)