QBasic 1.1: WINDOW Statement

Explanation

WINDOW Statement

Defines logical dimensions for the current graphics viewport. Use the WINDOW statement to define your own viewport coordinate system.

Worth knowing

Useful and cross-version information about the programming environments of QBasic, QuickBasic and Visual Basic for DOS.

ASCII Code Tables
Keyboard Scan Codes
Syntax Conventions
Screen Modes
Color Attributes
Error Codes

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Syntax

WINDOW [[SCREEN] (x1!,y1!)-(x2!,y2!)]

Description / Parameter(s)

SCREEN	Inverts the normal Cartesian direction of the y screen coordinates so that y values increase from the top of the screen to the bottom.
(x1!,y1!)	Logical coordinates that map to the upper-left screen coordinates of the viewport.
(x2!,y2!)	Logical coordinates that map to the lower-right screen coordinates of the viewport.
WINDOW with no arguments disables the logical coordinate system.
Use the VIEW statement to change the size of the viewport.

Example


'This example requires a color graphics adapter.
SCREEN 1
FOR i% = 1 TO 10 STEP 2
  WINDOW (-160 / i%, -100 / i%)-(160 / i%, 100 / i%)
  CIRCLE (0, 0), 10
NEXT i%