cloudcompare/plugins/core/Standard/qCloudLayers/include/ccMouseCircle.h

#pragma once

//##########################################################################
//#                                                                        #
//#                    CLOUDCOMPARE PLUGIN: ccCompass                      #
//#                                                                        #
//#  This program is free software; you can redistribute it and/or modify  #
//#  it under the terms of the GNU General Public License as published by  #
//#  the Free Software Foundation; version 2 of the License.               #
//#                                                                        #
//#  This program is distributed in the hope that it will be useful,       #
//#  but WITHOUT ANY WARRANTY; without even the implied warranty of        #
//#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         #
//#  GNU General Public License for more details.                          #
//#                                                                        #
//#                     COPYRIGHT: Sam Thiele  2017                        #
//#                                                                        #
//##########################################################################

/**
This is a custom 2DViewportLabel which takes up the entire viewport but is entirely transparent,
except for a circle with radius r around the mouse. 
*/

#include <ccGLWindowInterface.h>
#include <cc2DViewportObject.h>

class QEvent;

//Qt
#include <QObject>

class ccMouseCircle : public cc2DViewportObject, public QObject
{
public:
	//constructor
	explicit ccMouseCircle(ccGLWindowInterface* owner, QString name = QString("MouseCircle"));

	//deconstructor
	~ccMouseCircle() override;

	//get the circle radius in px
	inline int getRadiusPx() const { return m_radius; }

	//sets whether scroll is allowed or not
	inline void setAllowScroll(bool state) { m_allowScroll = state; }
	
protected:
	//draws a circle of radius r around the mouse
	void draw(CC_DRAW_CONTEXT& context) override;

private:
	//event to get mouse-move updates & trigger repaint
	bool eventFilter(QObject* obj, QEvent* event) override;

private:
	//ccGLWindowInterface this overlay is attached to -> used to get mouse position & events
	ccGLWindowInterface* m_owner;

	float m_pixelSize;

	int m_radius;
	int m_radiusStep;
	bool m_allowScroll;
};