After vtk.js' ImageCPRMapper class example is run, how do I get the image coordinates of the center line on the cpr plane in stretch and straighten mode

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To make sure that your calculations are right, you can visualize the centerline using the CPR mapper by adding this code in Sources\Rendering\OpenGL\ImageCPRMapper\index.js at line 806:

tcoordFSImpl.push(
  'if (abs(horizontalOffset) < 1.0)',
  '{',
  '  gl_FragData[0] = vec4(1.0, 0.0, 0.0, 1.0);',
  '  return;',
  '}'
);