QWebMap 4.58.4

QWebMap 4.58.4

QWebMap started as a fork of GallPeters/QGIS2VectorTiles by Jossef Kanter. It is not an official release of the original plugin, and it installs next to it.

This is the generic edition — the one to download. (A special Hungarian zoning-plan edition, not for general use, is released separately with a -hu tag.)

Faster

• Visible-polygon labels with Horizontal, Free and Around point placement are 2–3 times lighter zoomed out. 4.58.3 sped up Over point labels; these placements now get their share:

  • Zoomed out, most small polygons lie under a label placed before them. Finding a free spot in each of them was most of the work (61 % of an update), only to find none. A polygon wholly inside such a label's box is now skipped at once.
  • Every polygon is decoded once per tile for every placement (lines too), and what depends only on a whole polygon is computed once per zoom: its ranked candidate spots (Horizontal), its angle (Free), its centroid and the positions around it (Around point), its label's size.
  • Fewer allocations while looking up nearby labels.

  One label update on a 100 000-parcel test layer (Chrome with software graphics, so compare the numbers with each other), zoom 12 / 13 / 14:

  	4.58.3	4.58.4
  Horizontal	3.6 / 2.6 / 1.2 s	1.1 / 0.65 / 0.4 s
  Free	3.6 / 2.7 / 1.25 s	1.2 / 1.0 / 0.7 s
  Around point	1.7 / 1.0 / 0.33 s	1.4 / 0.7 / 0.25 s

  The labels are the same: compared with 4.58.3 on 540 random layouts (the three placements, panned views), not one differed.