loon (version 1.4.1)

l_layer_isVisible: Return visibility flag of layer

Description

Hidden or invisible layers are not rendered. This function queries whether a layer is visible/rendered or not.

Usage

l_layer_isVisible(widget, layer)

Value

TRUE or FALSE depending whether the layer is visible or not.

Arguments

widget

widget path or layer object of class 'l_layer'

layer

layer id. If the widget argument is of class 'l_layer' then the layer argument is not used

Details

Visibile layers are rendered, invisible ones are not. If any ancestor of a layer is set to be invisible then the layer is not rendered either. The layer visibility flag can be checked with l_layer_isVisible and the actual visibility (i.e. are all the ancesters visibile too) can be checked with l_layer_layerVisibility.

Note that layer visibility is not a state of the layer itself, instead is information that is part of the layer collection (i.e. its parent widget).

See Also

l_layer, l_layer_show, l_layer_hide, l_layer_layerVisibility, l_layer_groupVisibility

Examples

if(interactive()){

p <- l_plot()
l <- l_layer_rectangle(p, x=0:1, y=0:1)
l_layer_isVisible(p, l)
l_layer_hide(p, l)
l_layer_isVisible(p, l)

}