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module swap metview/5.14.0-develop |
How to start the symbol editor?
Start uPlot and open the sidebar then select the Symbols tab:
How to add a new symbol to the map?
Just click on the symbol in the sidebar, the cursor changes into a cross, then click on the map to add the symbol.
Lines
When you are creating a line double click to conclude the creation.
Polylines, curves and fronts
When you are creating a polyline or a curve each left-click on the map adds a new point and double-click concludes the creation.
What kind of symbol are available?
Fitted geo-shapes
These are special shapes where all the vertices keep their lat-lon positions as the projection changes and the edges between them are sampled linearly in lat-lon space. It means that in cylindrical projection the edges are always straight lines, while in other projections they might be curves. The following table shows how a fitted geo-shape changes as the projection changes from cylindrical to polar north:
| Shape | Cylindrical | Polar North |
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Geo Line |
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Geo Polyline |
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| Geo Polygon |
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Geo Quad The corner points always form a rectangle in the lat-lon space. |
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Geo shapes
In these shapes all the vertices keep their lat-lon positions as the projection changes and they are always connected with a straight line (or with a B-Spline for curves) in all the projections.
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| Object | Cylindrical | Polar North |
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| Line |
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| Geo rectangle |
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Markers and text
For these objects only the anchor point (see below) keeps its lat-lon position as the projection changes, while the extent is defined in terms of pixels:
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- for a text box it is the top left corner
- for a placemark it is the tip of the symbol (bottom-centre)
- for the other shapes it is the centre
Surface analysis
This is a collection of standard meteorological curves and symbols.
WMO symbols
All the WMO weather symbols are available here. They behave like markers, i.e. their centre keeps its lat-lon position when the projection changes and the extent is defined in pixels.
Can I add my own symbols?
You can use any square shaped SVG or PNG file as a symbol. These have to be added to the System/Symbols folder in your Metview home directory. When you start a uPlot window it scans this directory and adds all the files with .*svg or *.png suffix to the Markers and text group in the Symbols sidebar.
How can I edit the symbols?
Single click on the symbol: it gets into edit mode where you can move and resize it and edit its graphical properties from the ribbon editor at the top of the view area.
How can I edit the points on a polyline, curve or front?
Double click the symbol and the control points become visible. You can drag them now to a new location.
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You can add/remove points to a curve when you are in the point edit mode. Right click on a control point and use the actions in the context menu:
Can I rotate the objects?
It is not yet available.
Is redo-undo available?
It is not yet available.
How to generate a PNG or PDF from the scene?
Just use the Export button in the toolbar and choose between the PDF_QT or PNG_QT output formats.
Can I save the edited objects for later reuse?
It is not possible at the moment, so you will lose all the objects when close the uPlot window.
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