Objects like
point,
line, or
arc return certain values, for example
their current position. You can then use these values as options in
other objects. This makes it easy to connect two objects, for example:
$p1 = point({"type" => "empty",
"coordinates" => [[20,20]],
"polar" => [[50,0],[50,360]]});
line({"type" => "line",
"color" => "Red",
"foot" => [[-20,30],[50,-50]],
"head" => [${$p1}{"coordinates"}]
});
line({"type" => "line",
"color" => "Green",
"foot" => [[20,-30],[-50,50]],
"head" => [${$p1}{"coordinates"}]
});
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