\"\"\"
from qgis.core import *
from qgis.gui import *
@qgsfunction(args='auto', group='Custom')
def my_sum(value1, value2, feature, parent):
\"\"\"
Calculates the sum of the two parameters value1 and value2.
<h2>Example usage:</h2>
<ul>
<li>my_sum(5, 8) -> 13</li>
<li>my_sum(\"fiel1\", \"field2\") -> 42</li>
</ul>
\"\"\"
return value1 + value2
"""
try:
import expressions
expressions.load = load_user_expressions
expressions.load(expressionspath)
expressions.template = template
except ImportError:
# We get a import error and crash for some reason even if we make the expressions package
# TODO Fix the crash on first load with no expressions folder
# But for now it's not the end of the world if it doesn't load the first time
pass
template = """from qgis.core import *
from qgis.gui import *
@qgsfunction(args='auto', group='Custom')
def my_sum(value1, value2, feature, parent):
\"\"\"
Calculates the sum of the two parameters value1 and value2.
<h2>Example usage:</h2>
<ul>
<li>my_sum(5, 8) -> 13</li>
<li>my_sum(\"field1\", \"field2\") -> 42</li>
</ul>
\"\"\"
return value1 + value2
"""
default_expression_template = template
try:
import expressions
expressions.load = load_user_expressions
expressions.load(expressionspath)
expressions.template = template
except ImportError:
# We get a import error and crash for some reason even if we make the expressions package
# TODO Fix the crash on first load with no expressions folder
# But for now it's not the end of the world if it doesn't load the first time
pass
