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The -window- Command

Sometimes it is useful to specify a β€œwindow” through which drawings are viewed. Parts of a figure extending outside the window are not drawn. A rectangular window is specified by giving the lower left and upper right corners of the desired window:

window 100,200;400,300 ⇙ β‡˜ one corner opposite corner

The corners could also be given in coarse-grid coordinates, as in β€œwindow 1524;1248”.

Drawings constructed from the various -draw- commands and -circle- commands are affected by a preceding -window- command. Line-drawn text (size non-zero) produced by -write-, -writec-, -show-, etc., will also be windowed. Like -size- and -rotate-, windowing is not reset upon entering a new main unit. Be sure to use a blank -windowcommand (blank tag) to turn off windowing operations. It is quite common for an author to forget to turn off windowing and then wonder why some of the drawings aren't showing up! The correct structure is shown below. (See Figures 9-9 and 9-10.)

window one corner;opposite corner . . . (windowed) display statements . . . window $$ blank tag to turn off . .

More on Erasing: The -eraseu- Command

plato/tutor/window_command.txt Β· Last modified: 2023/08/05 18:56 by Site Administrator