ilog.tgo.resource
Class IltrZoom

java.lang.Object
  ilog.tgo.resource.IltrZoom

public abstract class IltrZoom
extends Object

This class contains all global parameters that have an effect on the physical (proportional) zoom.

See Also:

IlpGraphView.setZoomPolicy(ilog.cpl.graphic.views.IlpZoomPolicy), IltPhysicalZoomPolicy, IltMixedZoomPolicy

Field Summary

static double	SubnetworkCollapsionIconThreshold Threshold for a modified display of subnetworks.
static double	SubnetworkTitlebarFrameThreshold Threshold for a modified display of subnetworks.
static double	ThinGroupThreshold Threshold for a modified display of groups.
static double	ThinLinkThreshold Threshold for a modified display of links.

Method Summary

static double	GetVisibilityThreshold(IltGraphicElementName elementName) Returns the threshold for the visibility of decorations of a given kind.
static void	SetVisibilityThreshold(IltGraphicElementName elementName, double visibilityThreshold) Changes the threshold for the visibility of decorations of a given kind.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ThinLinkThreshold

public static double ThinLinkThreshold

Threshold for a modified display of links. When the absolute value of the view's transform's determinant is less than this value, links will be shown thinner and in a single color.

ThinGroupThreshold

public static double ThinGroupThreshold

Threshold for a modified display of groups. When the absolute value of the view's transform's determinant is less than this value, groups will be shown thinner and in a single color.

SubnetworkTitlebarFrameThreshold

public static double SubnetworkTitlebarFrameThreshold

Threshold for a modified display of subnetworks. When the absolute value of the view's transform's determinant is less than this value, the frame and background of a subnetwork of type TITLEBAR_FRAME will not be shown.

SubnetworkCollapsionIconThreshold

public static double SubnetworkCollapsionIconThreshold

Threshold for a modified display of subnetworks. When the absolute value of the view's transform's determinant is less than this value, the collapse icon will not be shown.

Method Detail

GetVisibilityThreshold

public static double GetVisibilityThreshold(IltGraphicElementName elementName)

Returns the threshold for the visibility of decorations of a given kind. When the absolute value of the drawing transform's determinant is less than this value, decorations of the given kind will not be shown.

See Also:

IlvTransformer.getDeterminant()

SetVisibilityThreshold

public static void SetVisibilityThreshold(IltGraphicElementName elementName,
                                          double visibilityThreshold)

Changes the threshold for the visibility of decorations of a given kind. When the absolute value of the drawing transform's determinant is less than this value, decorations of the given kind will not be shown.

The drawing transform depends on the zoom policy. Ignoring subnetworks, the zoom policy is as follows:

• physical zoom: the same as the view transform
• logical zoom: always a translation with a determinant of 1
• mixed zoom: a transform of absolute determinant <= 1, that is, < 1 in the case of physical zoom, = 1 when logical zoom is active.

Useful values for a visibility threshold are often between 0.01 and 1.

Note: When a transform is a scale transform, its determinant is the square of the scale factor. Therefore, to hide a decoration when the scale factor is below a certain value, you have to set the visibility threshold to the square of this value.

This setting has no effect if a visibility threshold on the same elementName that has been set in the current zoom policy.

See Also:

IlvTransformer.getDeterminant(), IltMixedZoomPolicy.setVisibilityThresholds(int, double)