Theme Visibility dialog

This dialog allows you to make layer themes visible between set zoom levels. Outside this range the default symbol is used. Within the range, the theme is applied. This should speed up rendering at higher zoom levels for complicated themes.

The dialog is displayed when the Visibility button of the Map Layer Properties dialog is clicked.

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Notes:

• Unit shown is the unit of the layer's coordinate system.
• An unchecked Enable theme visibility option indicates that the theme will be visible at all zoom levels.
• Clicking the relevant Current button will set the value to the zoom value as currently set on the Layer preview area of the Configure Map Layer dialog.
• Validation is implemented to ensure that both values are valid (for example, checks are made to ensure that value entered in Zoom is at least is smaller than value in Zoom is less than).