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added info about ellipses and units

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Adam Mayer 2017-12-15 10:57:21 -05:00
parent b0b0d42f8c
commit 13ea89fa8d
1 changed files with 12 additions and 1 deletions
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13
docs/Apple 401 Plotter.md
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@ -19,8 +19,19 @@ All drawing operations are clipped to the current viewport and window; parts of
arcs, circles, lines, etc. that would be rendered outside the viewport are not
drawn.
If the size of the window has a different aspect ratio than the size of the viewport,
the elements drawn will be stretched to fit. You can use this mechanism to draw ellipses
or stretched text.
Commands sent to the 401 are terminated by the ASCII "end of text" delimiter, 0x03.
A semicolon may also be used.
A semicolon or newline may also be used in some situations; however it's safest to
terminate a text-writing command (PL) with 0x03.
## Units
The base units for the viewport (as used in the VP command) are approximately 1 unit
= 0.1mm. (In practice, this is slightly off, so I don't recommend drawing any rulers
with this machine.)
### Serial connection