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Heavy-handedly fix clipping errors at the edges of z0 and z1 tiles

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This commit is contained in:
Eric Fischer 2014-10-15 17:03:30 -07:00
parent 8fec4ef9fc
commit 3bdcc3ca90
2 changed files with 31 additions and 8 deletions
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27
geojson.c
View File

@ -61,8 +61,31 @@ void latlon2tile(double lat, double lon, int zoom, unsigned int *x, unsigned int
double lat_rad = lat * M_PI / 180;
unsigned long long n = 1LL << zoom;
*x = n * ((lon + 180) / 360);
*y = n * (1 - (log(tan(lat_rad) + 1/cos(lat_rad)) / M_PI)) / 2;
long long llx = n * ((lon + 180) / 360);
long long lly = n * (1 - (log(tan(lat_rad) + 1/cos(lat_rad)) / M_PI)) / 2;
if (lat >= 85.0511) {
lly = 0;
}
if (lat <= -85.0511) {
lly = n - 1;
}
if (llx < 0) {
llx = 0;
}
if (lly < 0) {
lly = 0;
}
if (llx >= n) {
llx = n - 1;
}
if (lly >= n) {
lly = n - 1;
}
*x = llx;
*y = lly;
}
// http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames

12
tile.cc
View File

@ -373,8 +373,8 @@ void douglas_peucker(drawvec &geom, int start, int n, double e) {
}
}
static bool inside(draw d, int edge, int area) {
int clip_buffer = area / 64;
static bool inside(draw d, int edge, long long area) {
long long clip_buffer = area / 64;
switch (edge) {
case 0: // top
@ -408,8 +408,8 @@ static draw get_line_intersection(draw p0, draw p1, draw p2, draw p3) {
return draw(VT_LINETO, p0.x + (t * s1_x), p0.y + (t * s1_y));
}
static draw intersect(draw a, draw b, int edge, int area) {
int clip_buffer = area / 64;
static draw intersect(draw a, draw b, int edge, long long area) {
long long clip_buffer = area / 64;
switch (edge) {
case 0: // top
@ -437,9 +437,9 @@ static draw intersect(draw a, draw b, int edge, int area) {
static drawvec clip_poly1(drawvec &geom, int z, int detail) {
drawvec out = geom;
unsigned area = 0xFFFFFFFF;
long long area = 0xFFFFFFFF;
if (z != 0) {
area = 1 << (32 - z);
area = 1LL << (32 - z);
}
for (int edge = 0; edge < 4; edge++) {