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55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
#include "nmVolumeSliceSettings.h"
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#include "nmVolumeData.h"
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#include <QCoreApplication>
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#include <cmath>
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#include <vtkMath.h>
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nmVolumeSliceSettings::nmVolumeSliceSettings()
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: m_bShowPlane(true), m_bShowSource(false)
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{
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for(int nAxis = 0; nAxis < 3; ++nAxis) {
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m_dOrigin[nAxis] = 0.0;
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m_dNormal[nAxis] = nAxis == 2 ? 1.0 : 0.0;
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}
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}
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nmVolumeSliceSettings nmVolumeSliceSettings::fromData(const nmVolumeData& oData)
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{
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nmVolumeSliceSettings oSettings;
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double dBounds[6];
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oData.getBounds(dBounds);
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for(int nAxis = 0; nAxis < 3; ++nAxis) {
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// 避免两个同号大坐标相加溢出。
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oSettings.m_dOrigin[nAxis] = dBounds[2 * nAxis] * 0.5 + dBounds[2 * nAxis + 1] * 0.5;
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}
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oSettings.m_sPropertyId = oData.getInitialPropertyId();
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return oSettings;
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}
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bool nmVolumeSliceSettings::normalize(QString* pError)
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{
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if(pError != nullptr) pError->clear();
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double dMaximum = 0.0;
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for(int nAxis = 0; nAxis < 3; ++nAxis) {
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if(!vtkMath::IsFinite(m_dOrigin[nAxis]) || !vtkMath::IsFinite(m_dNormal[nAxis])) {
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if(pError != nullptr) *pError = QCoreApplication::translate("nmVolumeSliceSettings", "Origin and normal must contain finite numbers.");
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return false;
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}
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dMaximum = qMax(dMaximum, std::fabs(m_dNormal[nAxis]));
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}
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if(dMaximum == 0.0) {
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if(pError != nullptr) *pError = QCoreApplication::translate("nmVolumeSliceSettings", "The plane normal must not be zero.");
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return false;
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}
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// 先缩放再求模，兼容科学计数法输入的极大、极小非零法向。
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double dNormal[3];
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double dLengthSquared = 0.0;
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for(int nAxis = 0; nAxis < 3; ++nAxis) {
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dNormal[nAxis] = m_dNormal[nAxis] / dMaximum;
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dLengthSquared += dNormal[nAxis] * dNormal[nAxis];
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}
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const double dLength = std::sqrt(dLengthSquared);
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for(int nAxis = 0; nAxis < 3; ++nAxis) m_dNormal[nAxis] = dNormal[nAxis] / dLength;
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return true;
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}
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