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#include "nmVTKScalarBarLayer.h"
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#include <QByteArray>
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#include <QCoreApplication>
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#include <QThread>
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#include <vtkLookupTable.h>
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#include <vtkMath.h>
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#include <vtkScalarBarActor.h>
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namespace {
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// ScalarBarActor 和 LookupTable 均只能在 Qt GUI 线程中修改。
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bool isScalarBarGuiThread()
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{
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QCoreApplication* pApplication = QCoreApplication::instance();
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return pApplication == nullptr ||
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pApplication->thread() == QThread::currentThread();
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}
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}
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nmVTKScalarBarLayer::nmVTKScalarBarLayer(const QString& sLayerId)
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: nmVTKRenderLayer(sLayerId),
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m_pLookupTable(nullptr),
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m_pActor(vtkSmartPointer<vtkScalarBarActor>::New())
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{
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Q_ASSERT(isScalarBarGuiThread());
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// vtkScalarBarActor 是二维 Prop，仍通过图层基类统一完成挂载和显隐。
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setRenderProp(m_pActor);
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}
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nmVTKScalarBarLayer::~nmVTKScalarBarLayer()
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{
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Q_ASSERT(isScalarBarGuiThread());
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// 先移除二维 Prop，再释放对外部 LookupTable 的共享引用。
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detach();
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m_pLookupTable = nullptr;
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}
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void nmVTKScalarBarLayer::setLookupTable(vtkLookupTable* pLookupTable)
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{
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Q_ASSERT(isScalarBarGuiThread());
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if(!isScalarBarGuiThread()) {
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return;
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}
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// 智能指针共享 LookupTable，保证外部释放原指针后色标仍可安全显示。
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m_pLookupTable = pLookupTable;
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m_pActor->SetLookupTable(pLookupTable);
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}
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vtkLookupTable* nmVTKScalarBarLayer::getLookupTable() const
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{
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return m_pLookupTable;
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}
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void nmVTKScalarBarLayer::setTitle(const QString& sTitle)
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{
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Q_ASSERT(isScalarBarGuiThread());
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if(!isScalarBarGuiThread()) {
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return;
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}
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m_sTitle = sTitle;
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// VTK 7.1 接口接收窄字符串，统一以 UTF-8 临时缓冲传入并由 Actor 复制。
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const QByteArray aTitle = sTitle.toUtf8();
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m_pActor->SetTitle(aTitle.constData());
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}
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QString nmVTKScalarBarLayer::getTitle() const
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{
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return m_sTitle;
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}
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bool nmVTKScalarBarLayer::setPosition(double dX, double dY)
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{
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Q_ASSERT(isScalarBarGuiThread());
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if(!isScalarBarGuiThread() || !vtkMath::IsFinite(dX) ||
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!vtkMath::IsFinite(dY)) {
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return false;
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}
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// vtkScalarBarActor 默认使用归一化视口坐标，位置值由上层布局策略决定。
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m_pActor->SetPosition(dX, dY);
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return true;
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}
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bool nmVTKScalarBarLayer::setSize(double dWidth, double dHeight)
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{
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Q_ASSERT(isScalarBarGuiThread());
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if(!isScalarBarGuiThread() || !vtkMath::IsFinite(dWidth) ||
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!vtkMath::IsFinite(dHeight) || dWidth <= 0.0 || dHeight <= 0.0) {
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return false;
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}
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// 这里只拒绝非正尺寸，不替业务层限制色标是否超出视口。
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m_pActor->SetWidth(dWidth);
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m_pActor->SetHeight(dHeight);
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return true;
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}
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vtkScalarBarActor* nmVTKScalarBarLayer::getActor() const
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{
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return m_pActor;
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}
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