How to add scale text in QGIS

Question

I'm using QGIS 2.18.4, I wanted to add "scale text" but can't find the tool for adding the scale text on the composer. I only see an option of add text and not "scale text" as in other GIS Software like ArcGIS. Is there anyone who knows this?

Answer 1

If you want to add a numeric scale like 1:10000 you can add a normal scalebar first and then change the style to 'Numeric' under Item Properties > Main Properties of the scalebar element.

Answer 2

You can register expression function to get your map scale. For example:

from qgis.utils import iface 

@qgsfunction(args='auto', group='Custom')
def get_composer_map_scale(comp_window_title, feature, parent):
    composer_views = iface.activeComposers()
    my_composition = None
    for view in composer_views:
        if view.window().windowTitle() == comp_window_title:
            my_composition = view.composition()
            break
    if my_composition is not None:
        # adjust map id below if you have more maps in the composer
        comp_map = my_composition.getComposerMapById(0)
        scale = '{:.0f}'.format(round(comp_map.scale(), 0))
        return scale
    else:
        return 'Unknown'

And use it in your HTML box or label:

Scale 1:[%get_composer_map_scale( 'Composer 1' )%]

where 'Composer 1' is your composer title.

Answer 3

In QGis 3.x you can add variables in text item with something like [%'1 : ' || round(map_get(item_variables('Main'), 'map_scale'),0)%]

Answer 4

Same as these?:

• Integrating numeric scales into a text or HTML box in QGIS print composer
• Is it possible in QGIS print composer to include a numeric scale in an html box?

According to OSGEO - QGIS developer it is not possible, but it will be in version 3.0. GitHub commit.