I have a QGIS project that displays calculation results on a map. There are several vector layers, each with >100 calculated fields. The way the data should be visualised is very similar for all these layers/fields. I try to write a script that duplicates a template layer, and changes the expressions for the symbology according to the selected fieldname.
Below is a screenshot of the properties I try to access (if I were to change them using the UI).
How do I access/change the expressions of the line width and line offset of a graduated symbology in PyQGIS?
In case someone else runs into this issue.
I solved it using a workaround. I saved the style of the source layer to a qml-file, for the duplicated layers I create a temporary copy of the qml-file, do a search-and-replace on the qml-file and apply this to the new layer using
newLayer.loadNamedStyle(pathToTheTempQmlFile)
Hope this helps:
rule=layer.renderer().rootRule().children()[0]
rule.setFilterExpression('whatever')
see:
QgsRuleBasedRenderer.Rule
Related
Recently i've been working on this repository https://github.com/xiaodongliang/forgeviewer_embed_in_powerbi_report to build a custom visual in Power BI to visualize the issues extracted from Bim track'S API.
The idea was visualizing them in associaton to the model's ROOMS.
In order to do that I worked with a NWC file, so i cuold export rooms as a geometry.
What i would like to do now is to highligt the rooms if a connected issue is selected from a table.
The problem is When i select an issue from a table, in the selection tree i can see highlighted the parent object name (ROOM) instead of the child (solid), and i think that is why i can't achieve my purpose (if not please correct me).
what i have
what i wold like to do
Does anyone know a way to do that?
If you would like to change your selection between (FIRST_OBJECT, LAST_OBJECT, LEAF_OBJECT) you can change viewer selection settings in order to test:
If you would like to achieve this programmatically :
Viewer.setSelectionMode();
could help you as well.
If I well understood, you want to highlight the child (which contain the mesh) instead of the parent.
The object highlight (isolate) is done in /forgePowerbiView/src/visual.ts with this code:
const dbIds = options.dataViews[0].table.rows.map(r =>
<number>r[0].valueOf());
console.log('dbIds: ' +dbIds)
this.forge_viewer.showAll();
this.forge_viewer.impl.setGhostingBrightness(true); //for isolate effect
this.forge_viewer.isolate(dbIds);
Take a look at this link Enumerating leaf nodes on Viewer. This will help you to get the dbIds you want to isolate.
I am not sure if I am just blind, but. In Mapbox you can filter your dataset.
So what I want is to display all lines of a given class, that have a certain attribute NOT set. I see options for Exists, Is and Is Not. But there is no Does not exist, right? Is there a way to define that? Or do I have to do that when exporting my dataset beforehand?
You will want to wrap your expression in the logical negation operator:
["!",{{your expression here}}]
In Mapbox Studio, after creating the filter, you can switch from the UI editor to the JSON editor at the bottom of the pane:
I have two Shape Data rows for a Shape's ShapeSheet:
Shape Data Label Prompt Type Format Value Invisible
Prop.Type "Type" "" 4 "Alpha;Beta;Gamma;Delta;Epsilon;Zeta;Eta;Theta;Iota;Kappa" INDEX(4,Prop.Type.Format) False
Prop.Abbrev "Abbrev" No Formula 4 "A;B;G;D;E;Z;E;T;I;K" INDEX(4,Prop.Abbrev.Format) True
The way I intent to use this is to have the user select the Type, say Epsilon, and then have the Abbrev automatically switch to the corresponding value in the Prop.Abbrev.Format.
Note: the values used here are placeholders for the actual values for my application, which are not shown here so they don't distract from the real answer I need, how to keep the selections in sync when the first one is chosen or changed.
Thanks for any help you can give!
I don't have Visio on this machine, so I am unable to copy and paste a working solution. The approach gets a little complicated, but extremely flexible.
Save your lists in the User section, rather than Prop - this then becomes underlying data for use in properties. If you are using a master stencil then this also helps with managing the fields.
You can now store an index in your data as well - this index points to the appropriate values in your arrays. You can use Actions and side menus to set the index which, when referenced properly, means you can have the full name and/or abbreviation in the side menu and the ShapeSheet does all the work underneath.
The functions you want to look at are:
Index (e.g. INDEX(1,User.Type) will return "Beta". (0-based)
Lookup (e.g. LOOKUP("D", User.Abbrev) will return "3". (0-based)
GetAtRef
SetAtRef
SetAtRefExpr
SetF
I had a similar business problem which relied on setting a background colour based on the value of shape data. Your final solution could end up including formulas like this: =SETF(GetRef(Prop.Type),"GUARD(INDEX(LOOKUP(Prop.X,Prop.X.Format),User.Type))").
For more in-depth discussion - check out https://superuser.com/questions/1277331/fillforegnd-in-shapesheet-using-wrong-data and the extended discussion at http://visguy.com/vgforum/index.php?topic=8205.15 - the latter link also includes an example file with working shapesheets (well, working to the extent that they exposed my problem).
Hello I'm using ImageJ to analyse -czi and -zvi files. I'm using an automatic selection with "create selection" or "analyze particle"s. It's working well when openening/importing the files with ImageJ. But when I try to use the Bio-Format importer Plugin with the same pictures, it's not working. Not my intended ROIS are selected but the background or even nothing. With using the plugin something about the parameters of the picture changes and I don't know what it is or how to undo it. Does somebody has an idea?
One of the Solutions I realised is a Change of scale. My original files use pixels, whereas the BioFormat importer converts the scale into microns.
Analyze--> Set Scale... --> Click to remove scale or changing the scale solves one part of the problem.
For a macro following code restores the scale:
run("Set Scale...", "distance=0 known=0 pixel=1 unit=pixel");
Still somethng about the colour values changes, I can't find, create selection is still not working properly.
I am generating xlsx files and would like to not have to compute the values of all formulae during this process.
That is, I would like to set <v> to 0 (or omit it) for cells with an <f>, and have Excel fill in the values when it is opened.
One suggestion was to have a macro run Calculate on startup, but have been unable to find a complete guide on how to do this with signed macros to avoid prompting the user. A flag you can set somewhere within the xlsx would be far better.
Edit: I'm not looking for answers that involve using Office programs to make changes. I am looking for file format details.
The Python module XlsxWriter sets the formula <v> value to 0 (unless the actual value is known) and the <calcPr> fullCalcOnLoad attribute to true in the xl/workbook.xml file:
<calcPr fullCalcOnLoad="1"/>
This works for all Excel and OpenOffice, LibreOffice, Google Docs and Gnumeric versions that I have tested.
The place it won't work is for non-spreadsheet applications that cannot re-calculate the formula value such as file viewers.
If calculation mode is set to automatic, Excel always (re)calculates workbooks on open.
So, just generate your files with calculation mode set to "Automatic".
In xl/workbook.xml, add following node to workbook node:
<calcPr calcMode="auto"/>
Also check Description of how Excel determines the current mode of calculation.
You can use macros as suggested, however you will create a less secure and less compatible workbook without avoiding user interaction to force calculation.
If you opt by using VBA, you may Application.Calculate in Workbook_Open event.
In your XML contents, simply omit the <v> entity in each cell that have a formula, this will force Ms Excel to actualize the formula whatever the Excel options are.
Instead of:
<c r="B2" s="1">
<f>SUM(A1:C1)</f>
<v>6</v>
</c>
Have:
<c r="B2" s="1">
<f>SUM(A1:C1)</f>
</c>
If you have to actualize formula in an already given XML contents, then you can code easily a small parser that search for each <c> entities. If the <c> entity has a <f> entity, then delete its <v> entity.
Faced the same problem when exporting xlsx'es via openxml (with fastest SAX + template file approach w/o zip stream rewinds).
Despite Calculation option=Automatic, no recalculation on opening the file.
Furthermore no recalculation via Calculate Now and Calculate Sheet buttons.
Only upon selecting the cell and pressing enter ;(
Original formula: SUM(A3:A999)
Solution:
Create an internal hidden sheet
Place end row number (999 in my case) into any cell in hidden sheet (P1 in my case)
Reference row number in the cell via INDIRECT operator
Final formula: SUM(A3:INDIRECT("A"&Internal!P1))
Please refer to the attached gifs
before.gif
after.gif
P.S.
Theoretically, in P1 you can implement dynamic row number calculation via smth like =LOOKUP(2;1/(Sheet1!A:A<>"");ROW(Sheet1!A:A)), but my customers were satisfied with hardcoded row number solution