ccMouseCircle.h

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#pragma once
 
#include <ecv2DViewportObject.h>
#include <ecvDisplayTools.h>
#include <ecvStdPluginInterface.h>
 
// Qt
#include <QEvent>
#include <QObject>
#include <QPoint>
 
class ccMouseCircle : public cc2DViewportObject, public QObject {
public:
    // constructor
    explicit ccMouseCircle(ecvMainAppInterface* appInterface,
                           QWidget* owner,
                           QString name = QString("MouseCircle"));
 
    // deconstructor
    ~ccMouseCircle();
 
    // get the circle radius in px
    inline int getRadiusPx() const { return m_radius; }
 
    // get the circle radius in world coordinates
    float getRadiusWorld();
 
    // removes the link with the owner (no cleanup)
    inline void ownerIsDead() { m_owner = nullptr; }
 
    // 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:
    ecvMainAppInterface* m_app;
 
    QWidget* m_owner;
 
    float m_pixelSize;
 
    // event to get mouse-move updates & trigger repaint
    bool eventFilter(QObject* obj, QEvent* event) override;
 
    int m_radius;
    int m_radiusStep;
    bool m_allowScroll;
};