I would like to convert the coordinates of a PlanarLine defined in a pf
file to world coordinates. I assumed that the way to do this was multiple
the (x, y, 0) of each control point by a transformation matrix specific by
the transformParam. That does not seem to work. Apparently I am just
supposed to add the origin to the control point. What am I misunderstanding
with how the planar figure / PlanarLine is represented in XML? These files
are created using MITK-GEM and stored in an mitk scene file.
Here is the pf file:
<?xml version="1.0" ?>
<Version
Writer="C:\MITK\build2013\MITK\Modules\PlanarFigure\src\IO\mitkPlanarFigureWriter.cpp"
CVSRevision="$Revision: 17055 $" FileVersion="1" />
<PlanarFigure type="PlanarLine">
<property key="closed" type="BoolProperty">
<bool value="false" />
</property>
<property key="initiallyplaced" type="BoolProperty">
<bool value="true" />
</property>
<ControlPoints>
<Vertex id="0" x="115.8695640182204" y="213.91333499194826" />
<Vertex id="1" x="112.39129840859526" y="44.347886522720955" />
</ControlPoints>
<Geometry>
<transformParam param0="0.958333313465118" param1="0"
param2="0" param3="0" param4="-0.958333313465118" param5="0"
param6="0" param7="0" param8="-6.50000047683716"
param9="-112.320826202631" param10="112.13685862045457"
param11="29.695721817634535" />
<boundsParam bound0="0" bound1="240" bound2="0"
bound3="262.53344449978272" bound4="0" bound5="1" />
<Spacing x="0.958333313465118" y="0.958333313465118"
z="6.500000476837157" />
<Origin x="-112.320826202631" y="112.13685862045457"
z="29.695721817634535" />
</Geometry>
</PlanarFigure>
naively this was the matrix I tried to use:
array([[ 0.95833331, 0. , 0. , 0. ],
[ 0. , -0.95833331, 0. , 0. ],
[ 0. , 0. , -6.50000048, 0. ],
[-112.32082367, 112.13685608, 29.69572258, 1. ]])
however this is the matrix that actually works:
array([[ 1. , 0. , 0. , 0. ],
[ 0. , -1. , 0. , 0. ],
[ 0. , 0. , -1. , 0. ],
[-112.32082367, 112.13685608, 29.69572258, 1. ]])
Is there a more correct way of creating the second matrix other than
setting the on diagonal elements to (+1 or-1)? How do I do if the
value should be +1 or -1?
Thanks for the help,
Alex
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