PMap

FreeBASIC

PMap
 
Maps coordinates between view and physical mapping.

Syntax

Declare Function PMap ( ByVal coord As Single, ByVal func As Long ) As Single

Usage

result = PMap( coord, func )

Parameters

coord
An expression indicating the coordinate to be mapped.
func
The mapping function number to be applied to given coordinate.

Return Value

The mapped coordinate value.

Description

This function converts a coordinate between view (as defined by the Window statement) and physical (as set by the View (Graphics) statement) mappings. Depending on the value of func, expr is used to compute a different mapping to be returned by PMap:

func value:return value:
0Treats expr as x view coordinate and returns corresponding x physical coordinate.
1Treats expr as y view coordinate and returns corresponding y physical coordinate.
2Treats expr as x physical coordinate and returns corresponding x view coordinate.
3Treats expr as y physical coordinate and returns corresponding y view coordinate.


Example

Screen 12
Window Screen (0, 0)-(100, 100)
Print "Logical x=50, Physical x="; PMap(50, 0)   '' 320
Print "Logical y=50, Physical y="; PMap(50, 1)   '' 240
Print "Physical x=160, Logical x="; PMap(160, 2) '' 25
Print "Physical y=60, Logical y="; PMap(60, 3)   '' 12.5
Sleep


Differences from QB

  • None

See also