yang686526

how can an empty layout/viewport be detected
how can an empty layout/viewport be detected
i am processing layouts for certain blocks, but i want to retain a list of all layouts that are not empty - that would be something along these lines;
layout has no viewport ->layout is empty
layout has a viewport, which has no enitities -> layout is empty
layout has a viewport, which has entities -> layout is not empty
i can get the layout, i can get the viewport - but, how can i know the viewport is empty?
thanks
bill
i think it depends on your software: the viewport can be empty if the model space contains no entities, or if the modelspace contains no visible entities (for example if the layers are turned on/off or frozen), or if the viewport has frozen layers specifically for itself. or, there may be visible entities in the model space but they may be outside the viewport visibility area - in that case detecting this will be more difficult. you choose which to support...
best regards
chudomir
quote:
originally posted by chudo
i think it depends on your software: the viewport can be empty if the model space contains no entities, or if the modelspace contains no visible entities (for example if the layers are turned on/off or frozen), or if the viewport has frozen layers specifically for itself. or, there may be visible entities in the model space but they may be outside the viewport visibility area - in that case detecting this will be more difficult. you choose which to support...
thanks for the reply
what i want to do is have a way to discard layouts which are "empty".
as i understand it, all layouts have at least one viewport.
assuming that is true, what i would then want to do do is ask the question "does this viewport have any entities". i dont care if they are frozen, thawed, etc - i just want to understand that one question.
to make it more clear, i am not projecting the drawing into a viewer - i am walking it for properties and attributes. one of the attributes i will store is the layouts in the drawing. but, i dont want to save layouts which are meaningless.
hi,
quote:
as i understand it, all layouts have at least one viewport.
you are right, a layout always has one viewport (or rather it is the block table record associated with the layout that has the viewport) - this is the main viewport through which the paperspace rendering is done. this viewport is the first entity found in the block.
quote:
i would then want to do do is ask the question "does this viewport have any entities"
well, a viewport in the paperspace is an entity. therefore it does not contains any other entities. during regen, the viewport defines a view in itself which render the modelspace entities. so, an empty viewport can mean an empty modelspace. the only exception is the first viewport in the paperspace block, which displays paperspace entities, but you should skip it in your checks.
best regards
chudomir