init
The AM command creates a macro aperture template and adds it to the aperture template dictionary (see 2.2). A template is a parametrized shape. The AD command instantiates a template into an aperture by supplying values to the template parameters.
Templates of any shape or parametrization can be created. Multiple simple shapes called primitives can be combined in a single template. An aperture macro can contain variables whose actual values are defined by:
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Values provided by the AD command
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Arithmetic expressions with other variables
The template is created by positioning primitives in a coordinate space. The origin of that coordinate space will be the origin of all apertures created with the state.
A template must be defined before the first AD that refers to it. The AM command can be used multiple times in a file.
Attributes are not attached to templates. They are attached to the aperture at the time of its creation with the AD command.
An AM command contains the following words:
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The AM declaration with the macro name
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Primitives with their comma-separated parameters
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Macro variables, defined by an arithmetic expression