import vtkColorMaps from '@kitware/vtk.js/Rendering/Core/ColorTransferFunction/ColorMaps'
import vtkColorTransferFunction from '@kitware/vtk.js/Rendering/Core/ColorTransferFunction'
import vtkPiecewiseFunction from '@kitware/vtk.js/Common/DataModel/PiecewiseFunction'
var currentPreset = 'hsv'
function setPetColorMapTransferFunctionForVolumeActor(
  volumeInfo
) {
  const { volumeActor, preset } = volumeInfo
  const mapper = volumeActor.getMapper()
  mapper.setSampleDistance(1.0)

  const cfun = vtkColorTransferFunction.newInstance()
  const presetToUse = preset || vtkColorMaps.getPresetByName(currentPreset)
  cfun.applyColorMap(presetToUse)
  cfun.setMappingRange(0, 5)

  volumeActor.getProperty().setRGBTransferFunction(0, cfun)

  // Create scalar opacity function
  const ofun = vtkPiecewiseFunction.newInstance()
  ofun.addPoint(0, 0.0)
  ofun.addPoint(0.1, 0.9)
  ofun.addPoint(5, 1.0)

  volumeActor.getProperty().setScalarOpacity(0, ofun)
}
function switchColorPreset(preset) {
  currentPreset = preset
}
export { setPetColorMapTransferFunctionForVolumeActor, switchColorPreset }