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* add roundness function * add roundness function tests * add roundness function help * add roundness expression * add roundness expression tests * add roundness expression help * add roundness processing * add roundness processing tests * add roundness processing help * fix import and typo * Fix typo Co-authored-by: Harrissou Sant-anna <delazj@gmail.com> * Add tag Co-authored-by: Harrissou Sant-anna <delazj@gmail.com> * Fix typo Co-authored-by: Harrissou Sant-anna <delazj@gmail.com> * Modify the description Co-authored-by: Harrissou Sant-anna <delazj@gmail.com> * Replace equality condition by qgsDoubleNear Co-authored-by: Loïc Bartoletti <lbartoletti@users.noreply.github.com> * Change types for literals Co-authored-by: Loïc Bartoletti <lbartoletti@users.noreply.github.com> * add since version Co-authored-by: Loïc Bartoletti <lbartoletti@users.noreply.github.com> * add a const * add the \since adding in the sip file * Fix typo Co-authored-by: Loïc Bartoletti <lbartoletti@users.noreply.github.com> * Fix typo Co-authored-by: Loïc Bartoletti <lbartoletti@users.noreply.github.com> * Remove SIP factory annotation Co-authored-by: Nyall Dawson <nyall.dawson@gmail.com> * Remove double calculation of permimeter Co-authored-by: Nyall Dawson <nyall.dawson@gmail.com> * Always add an attribute Co-authored-by: Nyall Dawson <nyall.dawson@gmail.com> * Use QGSCOMPARENEAR in tests Co-authored-by: Nyall Dawson <nyall.dawson@gmail.com> * Shorten the short description Co-authored-by: Nyall Dawson <nyall.dawson@gmail.com> * Make a more complete help string Co-authored-by: Nyall Dawson <nyall.dawson@gmail.com> * Correct the description Co-authored-by: Nyall Dawson <nyall.dawson@gmail.com> * reformat bad code styles * sipify Co-authored-by: Harrissou Sant-anna <delazj@gmail.com> Co-authored-by: Loïc Bartoletti <lbartoletti@users.noreply.github.com> Co-authored-by: Nyall Dawson <nyall.dawson@gmail.com>
13 lines
576 B
Plaintext
13 lines
576 B
Plaintext
{
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"name": "roundness",
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"type": "function",
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"groups": ["GeometryGroup"],
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"description": "Calculates how close a polygon shape is to a circle. The function returns 1 when the polygon shape is a perfect circle and 0 when it is completely flat.",
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"arguments": [
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{"arg":"geometry","description":"a polygon"}],
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"examples": [
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{ "expression":"round(roundness(geom_from_wkt('POLYGON(( 0 0, 0 1, 1 1, 1 0, 0 0))')), 3)", "returns":"0.785"},
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{ "expression":"round(roundness(geom_from_wkt('POLYGON(( 0 0, 0 0.1, 1 0.1, 1 0, 0 0))')), 3)", "returns":"0.260"}
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]
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}
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