Sinclair QL - Page 170

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Operates the 'pen' In turtle graphics. If the pen is up then nothing Will be drawn. If the
pen
is down then lines will be drawn as the turtle moves across the screen.
The
line will be drawn in the window attached to the specified or default channel. The
line will be drawn In the current ink colour for the channel to which the output is directed.
syntax:
PENUP [channe~
PENDOWN [channe~
example: i. PENUP [will raise the pen in the default channel]
ii. PENDOWN #2 [will lower the pen in the window attached to
channel 2)
PI is a function which returns the value of 7t.
PENUP
PENDOWN
turtle graphics
PI
maths functions
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syntax:
example:
12/84
PI
PRINT PI
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