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Here is an example of how to do that.

<node name="tfs" pkg="ctt_tools" type="tfs" respawn="true"/> 
    <param name="param_1" value="23.0" />
</node>

and

double param_1;
node_handle.getParam("/tfs/param_1", param_1);      
if(m.point.x > param_1 && m.point.x < 26 && m.point.y > -4.70 && m.point.y < 4.50 )
{ 
   ...
}

You could also refer to Parameters in launch file and Use parameters in roscpp for more details.

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