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<!-- This file is to illustrate the use of the constraint symmetry_by_point.
It still has not been run on any DGS, so it may contain bugs. -->
<construction xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../xml/intergeo.xsd">
<elements>
<point id="C">
<homogeneous_coordinates>
<double>0.0</double>
<double>0.0</double>
<double>1.0</double>
</homogeneous_coordinates>
</point>
<point id="P">
<homogeneous_coordinates>
<double>2.0</double>
<double>1.0</double>
<double>1.0</double>
</homogeneous_coordinates>
</point>
<point id="P2">
<homogeneous_coordinates>
<double>-2.0</double>
<double>-1.0</double>
<double>1.0</double>
</homogeneous_coordinates>
</point>
<point id="Q">
<homogeneous_coordinates>
<double>3.0</double>
<double>4.0</double>
<double>1.0</double>
</homogeneous_coordinates>
</point>
<point id="Q2">
<homogeneous_coordinates>
<double>-3.0</double>
<double>-4.0</double>
<double>1.0</double>
</homogeneous_coordinates>
</point>
<line_segment id="s">
<homogeneous_coordinates>
<double>2.0</double>
<double>1.0</double>
<double>1.0</double>
</homogeneous_coordinates>
<homogeneous_coordinates>
<double>3.0</double>
<double>4.0</double>
<double>1.0</double>
</homogeneous_coordinates>
</line_segment>
<line_segment id="s2">
<homogeneous_coordinates>
<double>-2.0</double>
<double>-1.0</double>
<double>1.0</double>
</homogeneous_coordinates>
<homogeneous_coordinates>
<double>-3.0</double>
<double>-4.0</double>
<double>1.0</double>
</homogeneous_coordinates>
</line_segment>
</elements>
<constraints>
<free_point>
<point out="true">C</point>
</free_point>
<free_point>
<point out="true">P</point>
</free_point>
<free_point>
<point out="true">Q</point>
</free_point>
<line_segment_by_points>
<line_segment out="true">s</line_segment>
<point>P</point>
<point>Q</point>
</line_segment_by_points>
<symmetry_by_point>
<point out="true">P2</point>
<point>P</point>
<point>C</point>
</symmetry_by_point>
<symmetry_by_point>
<point out="true">Q2</point>
<point>Q</point>
<point>C</point>
</symmetry_by_point>
<symmetry_by_point>
<point out="true">s2</point>
<point>s</point>
<point>C</point>
</symmetry_by_point>
</constraints>
</construction>
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