Hi Michael,
I gave a look at the usage of LayerView class and I found a bug on opening
project if layerViews are saved into a project file
This is the sequence:
1) I create a project and load (or create) a new layer
2) I create a layerView of selected layer and click to save the project
3) OpenJUMP asks to save the newly created layer (=layerView) as JMP or
SHP.
4) I select to create a new layer. The the saving project is finalized and
a project file is saved.
5) I try to open the project.the *project is not opened* and an error
message shows the problem is in OpenProjectWizard, possibly on
loadLayers(...) method:
j
*ava.lang.Exception: Caricando il file progetto
'C:\Users\Beppe\Desktop\2.jmp' fallito con
errore:com.vividsolutions.jump.workbench.model.LayerView. at
org.openjump.core.ui.plugin.file.open.OpenProjectWizard.open(OpenProjectWizard.java:195)
at
org.openjump.core.ui.plugin.file.open.OpenProjectWizard.open(OpenProjectWizard.java:132)
at
org.openjump.core.ui.plugin.file.open.OpenProjectWizard.run(OpenProjectWizard.java:127)
at
org.openjump.core.ui.plugin.AbstractWizardPlugin.run(AbstractWizardPlugin.java:73)*
* ...........................................*
I opened the project file with a text editor and substitute
any
layer class="com.vividsolutions.jump.workbench.model.LayerView"
with
layer class="com.vividsolutions.jump.workbench.model.Layer"
In this case I can open the project file in openjump with no problem.
------------------------------------------------------------------------------------------
Apart from the bug, I have some observations for possible further
development
a) a LayerView is be a simple "view" of a layer: the modification action is
syncroniozed: whenever I modified the geometries of a layer, the
modification affects also the conresponding LayerView. In this case the
"view" could be a parameter to save only into the project file without the
need to create a clone of the layer.
b) II found the LayerView can have a great positive impact on OJ style as
users can create multiple views of the same layer with different styles.
I explored the possibility to create subviews of a selected layer,
according to defined attribute (*). The easy way was to create sub feature
collections according to the attribute, create conresponding sub-layers
(which are not opened into the view, create conresponding views to load
into the view.
Of coarse those subviews are not subviews of the original layer but
subviews of sub-layers. The syncronized modification is lost.
(*) This could be extremely useful as OJ lacks of a good point/linestring
decoration symbology according to attribute. I am Thinking about vertex
symbol rotation, the usage of wkt files, text display next to symbols -
what is available in CadPlann symbology plugin available only for basic
style
Best regards and thanks for your job
Peppe
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