Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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Graphics Programs
 
The following programming examples create shapes, colors, and patterns
on your screen.
 
Example 1
 
By making either of the CIRCLE statement start or end arguments negative,
you can connect an arc at its beginning or ending point with the center of
a circle. By making both arguments negative, you can draw shapes ranging
from a wedge that resembles a slice of pie, to the pie itself with the
piece missing. This example draws a pie shape with a piece missing.
 
  SCREEN 2
  CONST RADIUS = 150, PI = 3.141592653589#
  StartAngle = 2.5
  EndAngle = PI
  ' Draw the wedge:
  CIRCLE (320, 100), RADIUS, , -StartAngle, -EndAngle
  ' Swap the values for the start and end angles:
  SWAP StartAngle, EndAngle
  ' Move the center 10 pixels down and 70 pixels to the
  ' right, then draw the "pie" with the wedge missing:
  CIRCLE STEP(70, 10), RADIUS, , -StartAngle, -EndAngle
 
Sample output
 
You'll have to run the program to see the output.