Bug report #18083
Simplify map tool - don't use douglas-peucker simplification
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: |  Denis Rouzaud | ||
| Category: | Map Tools | ||
| Affected QGIS version: | master | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | fixed/implemented |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 25979 |
Description
The simplify map tool currently forces Douglas-Peucker simplification (via the QgsGeometry::simplify method). Unfortunately this simplification technique is not ideal as it preserves jagged spikes within line work, making it unusable for cartographic simplification.
A better choice would be to utilise Visvalingam simplification (which is available from the QgsMapToPixelGeometrySimplifier class) - this simplification technique prefers to eliminate narrow jagged spikes, resulting in much more pleasing cartographic simplification.
(Or better - expose this choice to users so that they can select an appropriate simplification technique for their requirements)
Associated revisions
[FEATURE] Add choice of simplification method to simplify map tool
Allows different techniques to be used for simplification, including
the more cartographically pleasing "Visvalingam" simplification algorithm.
Fixes #18083
History
#1
Updated by Nyall Dawson about 6 years ago
- % Done changed from 0 to 100
- Status changed from Open to Closed
Applied in changeset qgis|dce21882c73b9d4d98a6001872bad0be849df6c1.
#2
Updated by Giovanni Manghi about 6 years ago
- Resolution set to fixed/implemented