IlvScaleVisibilityFilter Class Reference

Controls the visibility of a layer according to the scale. More...

#include <ilviews/maps/scalefilter.h>

Inheritance diagram for IlvScaleVisibilityFilter:

List of all members.

Public Member Functions
	IlvScaleVisibilityFilter (IlDouble minScale, IlDouble maxScale)
	Initializes an IlvScaleVisibilityFilter object.
IlDouble	getMaxScale () const
	Returns the maximum scale at which the layer is visible.
IlDouble	getMinScale () const
	Returns the minimum scale at which the layer is visible.
void	setMaxScale (IlDouble maxScale)
	Sets the maximum scale at which the layer is visible.
void	setMinScale (IlDouble minScale)
	Sets the minimum scale at which the layer is visible.
Static Public Member Functions
static IlDouble	NoLimit ()
	The value meaning that a scale limit is undefined.

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Detailed Description

Controls the visibility of a layer according to the scale.

A scale visibility filter allows a layer to be visible between a minimum scale and a maximum scale. Both limit scales can have the IlvScaleVisibilityFilter::NoLimit() value if the layer should be visible for any scale smaller than a minimum scale (this could be the case for layers containing low-resolution map data), or conversely, for any scale larger than a maximum scale (this could be the case for layers containing high-resolution map data). Library: ilvmaps

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Constructor & Destructor Documentation

IlvScaleVisibilityFilter::IlvScaleVisibilityFilter	(	IlDouble	minScale,
		IlDouble	maxScale
	)

Initializes an IlvScaleVisibilityFilter object.

The layer will be visible if its scale is between minScale and maxScale.

Parameters:

	minScale	The minimum scale at which the layer will be visible (for instance, 1/100000). If no minimum scale is required, you must pass the value IlvScaleVisibilityFilter::NoLimit().
	maxScale	The maximum scale at which the layer will be visible (for instance, 1/20000). If no maximum scale is required, you must pass the value IlvScaleVisibilityFilter::NoLimit().

See also:

IlvScaleVisibilityFilter::NoLimit()

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Member Function Documentation

IlDouble IlvScaleVisibilityFilter::getMaxScale

(

)

const

Returns the maximum scale at which the layer is visible.

Returns:

The maximum scale.

IlDouble IlvScaleVisibilityFilter::getMinScale

(

)

const

Returns the minimum scale at which the layer is visible.

Returns:

The minimum scale.

void IlvScaleVisibilityFilter::setMaxScale

(

IlDouble

maxScale

)

Sets the maximum scale at which the layer is visible.

Parameters:

maxScale

The maximum scale.

void IlvScaleVisibilityFilter::setMinScale

(

IlDouble

minScale

)

Sets the minimum scale at which the layer is visible.

Parameters:

minScale

The minimum scale.