ScaleBarWidget.h

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#pragma once
 
#include <vtkActor2D.h>
#include <vtkCamera.h>
#include <vtkLineSource.h>
#include <vtkPolyDataMapper2D.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkTextActor.h>
 
// Qt version compatibility handling
#include <QApplication>
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
#include <QDesktopWidget>
#endif
#include <QScreen>
 
class ScaleBarWidget {
public:
    ScaleBarWidget(vtkRenderer* renderer);
    ~ScaleBarWidget();
    void update(vtkRenderer* renderer, vtkRenderWindowInteractor* interactor);
    void setVisible(bool visible);
 
private:
    vtkSmartPointer<vtkActor2D> lineActor;
    vtkSmartPointer<vtkTextActor> textActor;
    vtkSmartPointer<vtkActor2D> leftTickActor;   // Left tick mark
    vtkSmartPointer<vtkActor2D> rightTickActor;  // Right tick mark
    double lastLength = 0.0;
    bool visible = true;
    double dpiScale = 1.0;
 
    // DPI retrieval method compatible with different Qt versions
    double getDPIScale();
 
    // Cross-platform font size optimization function
    int getOptimizedFontSize(int baseFontSize = 18);
 
    // Cross-platform DPI scaling function
    double getPlatformAwareDPIScale();
 
    // Create tick mark actor
    vtkSmartPointer<vtkActor2D> createTickActor(double x,
                                                double y,
                                                double length);
};