objectgraphics/

vis_transformpoint.pro

object graphics

includes main-level program

Transforms a point by a transformation matrix.

For example, let's rotate a point 90 degrees about the x-axis. The easiest way to specify the transformation matrix is with an IDLgrModel:

  IDL> model = obj_new('IDLgrModel')
  IDL> model->rotate, [1, 0, 0], 90

Next, use the model created to transform [0, 1, 0]:

  IDL> print, vis_transformpoint([0, 1, 0], model)
         0.0000000  -3.8285687e-16       1.0000000

This example is included as a main-level program at the end of this file and can be run by typing:

  IDL> .run vis_transformpoint

result = vis_transformpoint(point, ctm)

Transforms a point by a transformation matrix.

fltarr(3)

point in required type=fltarr(3): point in data coordinates
ctm in required type=object or fltarr(4, 4): either a transformation matrix or an object with a getCTM method