Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "use [% $now %] to insert the current time stamp".

A block of code is set as follows:

( landcover@1 > 0 AND landcover@1 <= 6 ) * 100
+ ( landcover@1 >= 7 AND landcover@1 <= 10 ) * 101
+ ( landcover@1 >= 11 ) * 102

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

def initGui(self):
    # create the toolbar icon and menu entry
    icon_path = ':/plugins/MyFirstMapTool/icon.png'
    self.map_tool_action=self.add_action(
        icon_path,
        text=self.tr(u'My 1st Map Tool'),
        callback=self.map_tool_init,
        parent=self.iface.mainWindow())
    self.map_tool_action.setCheckable(True)

Any command-line input or output is written as follows:

sudo apt-get install qgis python-qgis qgis-plugin-grass

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "To add text to the map, we can use the Add new label button or go to Layout | Add label".

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.