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Drop linetos smaller than tile resolution before doing normal simplification

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Since simplification is rather expensive
This commit is contained in:
Eric Fischer
2015-07-01 12:16:50 -07:00
parent af13a95dc1
commit 18cdcb0732
3 changed files with 13 additions and 9 deletions
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tile.cc
+7 -3
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@@ -236,7 +236,7 @@ mapnik::vector::tile create_tile(char **layernames, int line_detail, std::vector
unsigned x;
for (x = 0; x < features[i].size(); x++) {
if (features[i][x].type == VT_LINE || features[i][x].type == VT_POLYGON) {
features[i][x].geom = remove_noop(features[i][x].geom, features[i][x].type);
features[i][x].geom = remove_noop(features[i][x].geom, features[i][x].type, 0);
}
mapnik::vector::tile_feature *feature = layer->add_features();
@@ -546,7 +546,7 @@ long long write_tile(char **geoms, char *metabase, char *stringpool, unsigned *f
geom = clip_point(geom, z, line_detail, buffer);
}
geom = remove_noop(geom, t);
geom = remove_noop(geom, t, 0);
}
if (geom.size() > 0) {
@@ -620,6 +620,10 @@ long long write_tile(char **geoms, char *metabase, char *stringpool, unsigned *f
if ((t == VT_LINE || t == VT_POLYGON) && !prevent['s' & 0xFF]) {
if (!reduced) {
if (t == VT_LINE) {
geom = remove_noop(geom, t, 32 - z - line_detail);
}
geom = simplify_lines(geom, z, line_detail);
}
}
@@ -701,7 +705,7 @@ long long write_tile(char **geoms, char *metabase, char *stringpool, unsigned *f
for (x = 0; x < features[j].size(); x++) {
if (features[j][x].coalesced && features[j][x].type == VT_LINE) {
features[j][x].geom = remove_noop(features[j][x].geom, features[j][x].type);
features[j][x].geom = remove_noop(features[j][x].geom, features[j][x].type, 0);
features[j][x].geom = simplify_lines(features[j][x].geom, 32, 0);
}
}