fix(ITKHelper): Add ITK to VTK js image converter

Sources/Common/DataModel/ITKHelper/index.js

@@ -0,0 +1,30 @@
+import vtkImageData from 'vtk.js/Sources/Common/DataModel/ImageData';
+import vtkDataArray from 'vtk.js/Sources/Common/Core/DataArray';
+
+/**
+ * Converts an itk.js image to a vtk.js image.
+ *
+ * Requires an itk.js image as input.
+ */
+function convertItkToVtkImage(itkImage) {
+  // create VTK image data
+  const imageData = vtkImageData.newInstance({
+    origin: itkImage.origin.slice(),
+    spacing: itkImage.spacing.slice(),
+  });
+  const scalars = vtkDataArray.newInstance({
+    name: 'Scalars',
+    values: itkImage.data,
+    numberOfComponents: itkImage.imageType.components,
+  });
+
+  imageData.setDirection(itkImage.direction.data);
+  imageData.setDimensions(...itkImage.size);
+  imageData.getPointData().setScalars(scalars);
+
+  return imageData;
+}
+
+export default {
+  convertItkToVtkImage,
+};

Sources/Common/DataModel/index.js

@@ -5,6 +5,7 @@ import vtkCone from './Cone';
 import vtkCylinder from './Cylinder';
 import vtkDataSet from './DataSet';
 import vtkDataSetAttributes from './DataSetAttributes';
+import vtkITKHelper from './ITKHelper';
 import vtkImageData from './ImageData';
 import vtkImplicitBoolean from './ImplicitBoolean';
 import vtkLine from './Line';
@@ -25,6 +26,7 @@ export default {
   vtkCylinder,
   vtkDataSet,
   vtkDataSetAttributes,
+  vtkITKHelper,
   vtkImageData,
   vtkImplicitBoolean,
   vtkLine,