extract math from a canvas
XML canvas string, or table
The GetMath command extracts the content from a canvas inserted by the ShowCanvas command, or Maple Learn canvas constructed by a command, or fetched by the GetCanvas command.
Note that ShowCanvas and button actions clicked in an active canvas will set the global variable, _canvas. If the first argument is omitted, the _canvas global will be used. The returned list will contain Record structures describing the content. Each Record will have a type field, such that elem[i]:-type will return "math", "text", or other identifier. For elements that have their type member set to "math", there will be a math member containing the value. Similarly text elements will have a text member containing the value.
A "canvas" is an interactive section of a Maple document created by the NewCanvas command, or a shared web-based Maple Learn document. See the Script command for a more complete description.
When the keeptext=true option is given, the text content is returned in addition to the math. The default is to return only the math content.
When the keepall=true option is given, text and other content like buttons are returned in addition to the math.
Empty math structures are normally pruned from the result. Use the keepempty=true option to retain these. Their math member will be set to the empty string, "".
When the inert=true option is specified, operators will remain in InertForm style. This prevents simplification, for example, returning `%+`(1,1) instead of 2.
When the mathmlonly=true option is specified, the record's math field will be set to NULL, but the mathml field will remain populated.
Process a canvas from Maple Learn
In this section we will fetch a shared canvas from Maple Learn, and process it. This is similar to the processing that is done when clicking a button in Maple Learn.
Process an Active Canvas
In this section we create and show a canvas, then use the global variable, canvas to access the state.
cv≔NewCanvas⁡Another GetMath Example,ScriptButton⁡Check Your Page,DoNothing,position=500,50:
The DocumentTools[Canvas][GetMath] command was introduced in Maple 2021.
For more information on Maple 2021 changes, see Updates in Maple 2021.
Download Help Document
What kind of issue would you like to report? (Optional)