QGIS Print Composer – Can Map Layers Be Turned Off or Removed?

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The title pretty much says it all. I have a base map in QGIS that I am using with several Print Composers. In one of the Print Composers, I don't want one of the layers to show up. Is there any way to accomplish this?

Best Answer

you could unmark the layer (which you dont want to be drawn in one composer) in the layers panel, then do your settings in the print composer and then mark "lock layers for map item" in the Item Properties tab of the print composer. Now you have one print composer without that layer. Now reselect = checkmark this layer again in the layers-panel and create your other printcomposers, which will contain this layer too

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[GIS] Synchronizing QGIS Print Composer with map view

With a little help from Python, we could create a function which refreshes your composer map each time the canvas extent (from the main window) has changed. In otherwords, whenever you pan or zoom in/out of the canvas, the composer map will also update. You can type the following code into the Python Console:

def update_composer():
    active_Composer = iface.activeComposers()
    canvas = iface.mapCanvas()
    composer = active_Composer[0]
    composition = composer.composition()
    maps = [item for item in composition.items() if item.type() == QgsComposerItem.ComposerMap and item.scene()]
    composer_map = maps[0]
    moveX = composer_map.extent().center().x()-canvas.extent().center().x()
    moveY = composer_map.extent().center().y()-canvas.extent().center().y()
    unitCon = composer_map.mapUnitsToMM()
    composer_map.moveContent(-moveX * unitCon, moveY * unitCon)
    composer_map.setNewScale(canvas.scale())

iface.mapCanvas().extentsChanged.connect(update_composer)

Credit to the author Ed B for his plugin: Sync Composer With Map of which this code was based upon (you can download/install this plugin from the menubar: Plugins > Manage and Install Plugins...).

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[GIS] Synchronizing QGIS Print Composer with map view

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