FLIP

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgFlip
• Last revised: 2017-12-13

---

Changes the current video display page

Syntax

` declare function Flip ( byval frompage as long = -1, byval topage as long = -1 ) as long

`

Usage

` Flip [ frompage ] [, topage ]

`

Parameters

frompage

previous page

topage

new page to display

Return Value

Returns zero (0) if successful, or a non-zero error code to indicate a failure.

Description

In normal graphics mode, Flip is an alias for PCopy and ScreenCopy. See ScreenCopy for details.

In OpenGL mode, Flip does a hardware page flip and displays the contents of the backbuffer. It is recommended that you call Flip regularly while in OpenGL mode, otherwise your app may also become unresponsive.

The error code returned by Flip can be checked using Err in the next line. The function version of Flip returns directly the error code as a 32 bit Long.

Examples

start GeSHi

ScreenRes 320, 240, 32, 2    'Sets up the screen to be 320x240 in 32-bit color with 2 video pages.
ScreenSet 1,0                'Sets the working page to 1 and the displayed page to 0

For n As Integer = 50 To 270

    Cls
    Circle (n, 50),50 ,RGB(255,255,0) 'Draws a circle with a 50 pixel radius in yellow on page 1
    Flip 1,0    'Copies our circle from page 1 to page 0

    Sleep 25
Next

Print "Now wasn't that neat!"
Print "Push any key."
Flip 1,0    'Copies our text from page 1 to page 0
Sleep

end GeSHi

Dialect Differences

• Not available in the -lang qb dialect unless referenced with the alias __Flip.

Differences from QB

• New to FreeBASIC

Back to DocToc