User Guide

Lingo Dictionary 153

constrainV()

Syntax

constrainV (whichSprite, integerExpression)

Description

Function; evaluates integerExpression and then returns a value that depends on the vertical

coordinates of the top and bottom edges of the sprite specified by whichSprite, as follows:

• When the value is between the top and bottom coordinates, the value doesn’t change.

• When the value is less than the top coordinate, the value changes to the value of the top coordinate.

• When the value is greater than the bottom coordinate, the value changes to the value of the

bottom coordinate.

This function does not change the sprite properties.

Examples

These statements check the constrainV function for sprite 1 when it has top and bottom

coordinates of 40 and 60:

put constrainV(1, 20)

-- 40

put constrainV(1, 55)

-- 55

put constrainV(1, 100)

-- 60

This statement constrains a moveable slider (sprite 1) to the edges of a gauge (sprite 2) when the

mouse pointer moves past the edge of the gauge:

set the locV of sprite 1 to constrainV(2, the mouseV)