Contents
- 1 How to set layers in qgsmapcanvas-QGIS?
- 2 Do you have to have theme name in qgsmapcanvas?
- 3 What is the scope of the qgsmapcanvas class?
- 4 Can a qgslayertreemapcanvasbridge be used as a layer tree?
- 5 How to zoom map in QGIS layout independently?
- 6 Which is the most important widget in QGIS?
- 7 How is the context scope set in QGIS?
- 8 Which is QGIS application has no attribute’setlayers’?
- 9 Can you use mask plugin in standalone QGIS script?
How to set layers in qgsmapcanvas-QGIS?
Sets the list of layers that should be shown in the canvas. If the map canvas has been associated with a map theme via a call to setTheme (), then any calls to setLayers () are ignored. It is necessary to first clear the theme association by calling setTheme () with an empty string before setLayers () calls can be made. New in version 3.0.
Do you have to have theme name in qgsmapcanvas?
The theme name must match a theme present in the associated project’s QgsMapThemeCollection. When the canvas is associated to a map theme, it will automatically follow the layer selection and layer styles from that theme.
What is the scope of the qgsmapcanvas class?
Returns a reference to the expression context scope for the map canvas. This scope is injected into the expression context used for rendering the map, and can be used to apply specific variable overrides for expression evaluation for the map canvas render. New in version 2.12. Emitted when the extents of the map change [signal]
What is the Bool for freeze in QGIS?
Freeze/thaw the map canvas. This is used to prevent the canvas from responding to events while layers are being added/removed etc. frozen ( bool = True) – Boolean specifying if the canvas should be frozen (true) or thawed (false). Default is true.
When to deprecate decorations as a map canvas item?
TODO: deprecate when decorations are reimplemented as map canvas items – anything related to rendering progress is not visible outside of map canvas – additional drawing shall be done directly within the renderer job or independently as a map canvas item [signal]
Can a qgslayertreemapcanvasbridge be used as a layer tree?
Calls to setLayers () or setLayerStyleOverrides () will have no effect, and canvases associated with a QgsLayerTreeMapCanvasBridge will no longer synchronize their state with the layer tree.
How to zoom map in QGIS layout independently?
In main QGIS window, zoom to extent you want to use in Print Layout. 2. In Print Layout window, click “Set Map Extent to Match Main Canvas Extent” 3. See if Print Layout looks ok. If not, repeats steps 1 and 2 until you are satisfied. “Move Item Content” button (blue square) did not work for me.
Which is the most important widget in QGIS?
The Map canvas widget is probably the most important widget within QGIS because it shows the map composed from overlaid map layers and allows interaction with the map and layers. The canvas always shows a part of the map defined by the current canvas extent.
Which is a class for displaying GIS data?
Map canvas is a class for displaying all GIS data types on a canvas. Returns a list of all annotation items in the canvas. New in version 3.0. Returns true if annotations are visible within the map canvas. New in version 3.0. true if antialising is enabled
How to convert vector layer to raster using QGIS?
There are good answers here and I realize the question is a little old, but just to help with completeness here’s another approach. You can also use the v.to.rast.* GRASS modules, which are available through the Processing toolbox in QGIS. It lets you set the raster resolution and extents.
How is the context scope set in QGIS?
Sets an expression context scope for the map canvas. This scope is injected into the expression context used for rendering the map, and can be used to apply specific variable overrides for expression evaluation for the map canvas render. This method will overwrite the existing expression context scope for the canvas.
Which is QGIS application has no attribute’setlayers’?
– Geographic Information Systems Stack Exchange QgsMapCanvas has no attribute ‘setLayers’? I would like to construct a GUI using PyQt4 and qgis outside of the main QGIS application. I found this tutorial which provides some indications on how to do this.
Can you use mask plugin in standalone QGIS script?
After a long research and many tries, I’ve finally manage to simulate the Mask plugin QGIS init in a standalone script (after discovering it was not possible to init the plugins from such scripts using a single API: one should do this on his/her own).