VtkBGImageSource.cpp

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
// ** INCLUDES **
#include "VtkBGImageSource.h"
 
#include <vtkImageAlgorithm.h>
#include <vtkImageData.h>
#include <vtkImageShiftScale.h>
#include <vtkInformation.h>
#include <vtkInformationVector.h>
#include <vtkObjectFactory.h>
#include <vtkPlaneSource.h>
#include <vtkPointData.h>
#include <vtkSmartPointer.h>
#include <vtkStreamingDemandDrivenPipeline.h>
#include <vtkTexture.h>
 
#include "VtkVisHelper.h"
 
vtkStandardNewMacro(VtkBGImageSource);
 
VtkBGImageSource::VtkBGImageSource() = default;
VtkBGImageSource::~VtkBGImageSource() = default;
 
void VtkBGImageSource::SetRaster(vtkImageAlgorithm* img, double x0, double y0,
                                 double scalingFactor)
{
    double range[2];
    img->Update();
    img->GetOutput()->GetPointData()->GetScalars()->GetRange(range);
    vtkSmartPointer<vtkImageShiftScale> scale =
        vtkSmartPointer<vtkImageShiftScale>::New();
    scale->SetInputConnection(img->GetOutputPort());
    scale->SetShift(-range[0]);
    scale->SetScale(255.0 / (range[1] - range[0]));
    scale->SetOutputScalarTypeToUnsignedChar();
    scale->Update();
 
    vtkImageData* imageData = scale->GetOutput();
    int dims[3];
    imageData->GetDimensions(dims);
    vtkTexture* texture = vtkTexture::New();
    texture->InterpolateOff();
    texture->RepeatOff();
    // texture->EdgeClampOn(); // does not work
    texture->SetInputData(imageData);
    this->SetTexture(texture);
 
    _origin =
        std::pair<float, float>(static_cast<float>(x0), static_cast<float>(y0));
    _cellsize = scalingFactor;
 
    vtkSmartPointer<vtkPlaneSource> plane =
        vtkSmartPointer<vtkPlaneSource>::New();
    plane->SetOrigin(_origin.first, _origin.second, -1);
    plane->SetPoint1(_origin.first + dims[0] * _cellsize, _origin.second, -1);
    plane->SetPoint2(_origin.first, _origin.second + dims[1] * _cellsize, -1);
 
    this->SetInputConnection(0, plane->GetOutputPort(0));
    this->SetTexture(texture);
}
 
void VtkBGImageSource::SetUserProperty(QString name, QVariant value)
{
    VtkAlgorithmProperties::SetUserProperty(name, value);
}