Mathematica Asked by srossd on April 29, 2021
I’m trying to understand how Graphics expressions are rendered. I create an invisible notebook, write a cell and evaluate it, then rasterize the notebook.
UsingFrontEnd[
nb = CreateNotebook[Visible->False];
NotebookWrite[nb,Cell["Graphics[Disk[{0,0}]]","Input"]];
NotebookEvaluate[nb,InsertResults->True];
Export["test_out.jpg",Rasterize[nb]];
]
If I open Mathematica and run this line, the output is as expected:
But if I run this from the terminal (using math -script myscript.m
), the Graphics object doesn’t render in the output cell.
Is there any way to change this behavior, so that I get the same result running from within Mathematica or from the terminal? I’m running 12.1, if that’s important. I’m going to try to work around this using Export
, but for some parts of my application I really do need Rasterize
, so it would be convenient if I could use it in all instances.
In a command line mode, evaluators default to use InputForm
(raw wolfram language expressions), rather than StandardForm
(which MakeBoxes
).
I can't find any way to specify the default form for evalaution yet. But we can make the boxes on our own.
Replace the Cell
expression in your code to:
Cell["Graphics[Disk[{0,0}]]","Input",CellEvaluationFunction->(MakeBoxes@@MakeExpression[#,StandardForm]&)]
Then the code will work for the command line environment.
To reproduce the problem in the notebook environment, use such a CellEvaluationFunction
: (#1&)
.
The kernel can do MakeBoxes
and Export
of Graphics
, so UsingFrontEnd
is not essential for most rendering requirements. $DisplayFunction
may help.
Correct answer by bcegkmqs23 on April 29, 2021
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