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Stay in (tile-relative) world-scaled coordinates initially

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This commit is contained in:
Eric Fischer 2014-09-24 14:14:43 -07:00
parent ce3cdfc5e9
commit 5cde832ec6
1 changed files with 11 additions and 7 deletions
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18
tile.cc
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@ -77,9 +77,6 @@ int decode_feature(char **meta, struct draw *out, int z, unsigned tx, unsigned t
wwy -= ty << (32 - z);
}
wwx >>= (32 - detail - z);
wwy >>= (32 - detail - z);
if (out != NULL) {
out[len].x = wwx;
out[len].y = wwy;
@ -126,10 +123,6 @@ int draw(struct draw *geom, int n, mapnik::vector::tile_feature *feature) {
int dx = wwx - px;
int dy = wwy - py;
if (dx == 0 && dy == 0 && op == VT_LINETO) {
printf("0 delta\n");
}
if (feature != NULL) {
feature->add_geometry((dx << 1) ^ (dx >> 31));
feature->add_geometry((dy << 1) ^ (dy >> 31));
@ -204,6 +197,15 @@ int remove_noop(struct draw *geom, int n) {
return out;
}
void to_tile_scale(struct draw *geom, int n, int z, int detail) {
int i;
for (i = 0; i < n; i++) {
geom[i].x >>= (32 - detail - z);
geom[i].y >>= (32 - detail - z);
}
}
long long write_tile(struct index *start, struct index *end, char *metabase, unsigned *file_bbox, int z, unsigned tx, unsigned ty, int detail, int basezoom, struct pool *file_keys) {
GOOGLE_PROTOBUF_VERIFY_VERSION;
@ -265,6 +267,8 @@ long long write_tile(struct index *start, struct index *end, char *metabase, uns
deserialize_int(&meta, &t);
decode_feature(&meta, geom, z, tx, ty, detail);
to_tile_scale(geom, len, z, detail);
if (t == VT_LINE || t == VT_POLYGON) {
len = remove_noop(geom, len);
}