Plot; Draw - AMSTRAD cpc 6128 User Instruction

PLOT
Unlike the L 0 CAT E command, PLO T may be used to determine the position of the
graphics cursor, using pixel co-ordinates.
(A
pixel is the smallest possible segment of
the screen).
Note that the graphics cursor is not visible and is different from the character cursor.
There are 640 horizontal pixels by 400 vertical pixels. The x,y co-ordinates are
positioned with respect to the bottom left corner of the screen, which has x,y
co-ordinates of 0,0. Unlike the LO CAT E command used for characters, the
co-ordinates do not differ between modes 0,1, or 2.
To see this, first reset the computer using [CONTROL] [SHIFn [ESC], then type in:
pLot 320,200
A small dot will appear in the centre of the screen.
Now change the mode by typing in:
mode 0
pLot 320,200
You will see the dot is still in the centre but is now larger. Change the mode again and
type in the same command to see the effect in mode 2:
mode 2
pLot 320,200
The dobs still in the centre, but is now much smaller.
Plot several dots over the screen in various modes, in order to accustom yourself with
this command. When you have finished, return to mode 1 and clear the screen by
typing in:
mode
DRAW
First reset the computer using
[CONTROL] [SHIFn [ESC].
The D RAW command
draws a line from the current graphics cursor position. To see this in more detail,
draw a rectangle on the screen by using the following program.
We start by repositioning the graphics cursor with a PLO T command, then DRAWing
a line from the graphics cursor position, up towards the top left corner, then from
there to the right corner etc, etc. Type in:
Chapter 1 Page 58
Foundation Course
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