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Option to snap low zooms to a stairstep grid

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This commit is contained in:
Eric Fischer
2016-11-28 15:45:38 -08:00
parent c68d553e94
commit 0db8d9ed8b
7 changed files with 95 additions and 3 deletions
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tile.cpp
+7 -3
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@@ -443,12 +443,16 @@ void *partial_feature_worker(void *v) {
int line_detail = (*partials)[i].line_detail;
int maxzoom = (*partials)[i].maxzoom;
if (additional[A_GRID_LOW_ZOOMS] && z < maxzoom) {
geom = stairstep(geom, z, line_detail);
}
double area = 0;
if (t == VT_POLYGON) {
area = get_area(geom, 0, geom.size());
}
if ((t == VT_LINE || t == VT_POLYGON) && !(prevent[P_SIMPLIFY] || (z == maxzoom && prevent[P_SIMPLIFY_LOW]))) {
if ((t == VT_LINE || t == VT_POLYGON) && !(prevent[P_SIMPLIFY] || (z == maxzoom && prevent[P_SIMPLIFY_LOW]) || (z < maxzoom && additional[A_GRID_LOW_ZOOMS]))) {
if (1 /* !reduced */) { // XXX why did this not simplify if reduced?
if (t == VT_LINE) {
geom = remove_noop(geom, t, 32 - z - line_detail);
@@ -912,7 +916,7 @@ bool find_common_edges(std::vector<partial> &partials, int z, int line_detail, d
dv[i].op = VT_LINETO;
}
}
if (!(prevent[P_SIMPLIFY] || (z == maxzoom && prevent[P_SIMPLIFY_LOW]))) {
if (!(prevent[P_SIMPLIFY] || (z == maxzoom && prevent[P_SIMPLIFY_LOW]) || (z < maxzoom && additional[A_GRID_LOW_ZOOMS]))) {
simplified_arcs[ai->second] = simplify_lines(dv, z, line_detail, !(prevent[P_CLIPPING] || prevent[P_DUPLICATION]), simplification, 3);
} else {
simplified_arcs[ai->second] = dv;
@@ -1513,7 +1517,7 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
bool reduced = false;
if (t == VT_POLYGON) {
if (!prevent[P_TINY_POLYGON_REDUCTION]) {
if (!prevent[P_TINY_POLYGON_REDUCTION] && !additional[A_GRID_LOW_ZOOMS]) {
geom = reduce_tiny_poly(geom, z, line_detail, &reduced, &accum_area);
}
has_polygons = true;