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Round coordinates instead of truncating them (#60)

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* Round coordinates instead of truncating them

* Update all the tests for coordinate rounding changes

* Curses, integer division still truncates

* Fix tests

* Also round instead of shifting when looking for no-op linetos

* Should I worry that the same change for moveto doesn't change any tests?

* Also round instead of shifting when scaling down to maxzoom resolution

* Replace another explicit shift, for origin point

* Round instead of shift when writing clipped geometries to the next zoom

* Fix low-zoom gridding and smaller-than-a-pixel checks

* Don't guess an excessively large maxzoom when there is only one feature

* Add a test for guessing the maxzoom of a single point

* Explicitly sort by index if no other order distinguishes features

* Another affected test
This commit is contained in:
Erica Fischer
2023-01-27 10:57:22 -08:00
committed by GitHub
parent 1c576c2dc1
commit c58a8e3b97
181 changed files with 166358 additions and 165951 deletions
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projection.cpp
+3 -2
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@@ -2,6 +2,7 @@
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <cmath>
#include <atomic>
#include "projection.hpp"
#include "errors.hpp"
@@ -87,8 +88,8 @@ void epsg3857totile(double ix, double iy, int zoom, long long *x, long long *y)
*y = ((1LL << 32) - 1) - (iy * (1LL << 31) / 6378137.0 / M_PI + (1LL << 31));
if (zoom != 0) {
*x >>= (32 - zoom);
*y >>= (32 - zoom);
*x = std::round((double) *x / (1LL << (32 - zoom)));
*y = std::round((double) *y / (1LL << (32 - zoom)));
}
}