Drawing Graphics Items

The item command, IT, activates the special graphics mode where groups of graphics commands are assigned to an item number. These items can then be redrawn or modi￿ed without reexecuting the individual graphics commands. This is useful when a graphics item needs to be blanked and redrawn, changed, recolored, or repositioned at a later time. Executing IT assigns a series of graphics commands to an item number ranging from 1 to 50. The following program lines create items 1 and 2.

120

OUTPUT

723;"IT

1;"

Assign box item number 1.

130

OUTPUT

723;"PA

0,0,0,400,400,400,400,0,0,0;"

Draw box.

140

OUTPUT

723;"IT

2;"

Assign triangle item number 2.

150

OUTPUT

723;"PA

600,0,700,200,800,0,600,0;"

Draw triangle .

Graphics Items 1 and 2

Turning o￿ IT mode

To turn o￿ the special graphics mode entered with the IT command, you must execute one of the following commands: IT 0, IP, DELETE , or CLRDSP .

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