From 13ea89fa8dfe291599879894d430f0aa043c4ed2 Mon Sep 17 00:00:00 2001 From: Adam Mayer Date: Fri, 15 Dec 2017 10:57:21 -0500 Subject: [PATCH] added info about ellipses and units --- docs/Apple 401 Plotter.md | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/docs/Apple 401 Plotter.md b/docs/Apple 401 Plotter.md index 89fa230..aa69141 100644 --- a/docs/Apple 401 Plotter.md +++ b/docs/Apple 401 Plotter.md @@ -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