inline box2d<double> transform(box2d<double>& box) const
{
int x_offset = int(std::floor(box.minx() / tile_size_));
int y_offset = int(std::floor(box.miny() / tile_size_));
box2d<double> rem(x_offset * tile_size_,
y_offset * tile_size_,
x_offset * tile_size_,
y_offset * tile_size_);
box.init(box.minx() - rem.minx(),
box.miny() - rem.miny(),
box.maxx() - rem.maxx(),
box.maxy() - rem.maxy());
return rem;
}
// Output is centered around (0,0)
static void rotated_box2d(box2d<double> & box, rotation const& rot, pixel_position const& center, double width, double height)
{
double half_width, half_height;
if (rot.sin == 0 && rot.cos == 1.)
{
half_width = width / 2.;
half_height = height / 2.;
}
else
{
half_width = (width * rot.cos + height * rot.sin) /2.;
half_height = (width * rot.sin + height * rot.cos) /2.;
}
box.init(center.x - half_width, center.y - half_height, center.x + half_width, center.y + half_height);
}
inline void read_envelope(box2d<double>& envelope)
{
#ifndef MAPNIK_BIG_ENDIAN
file_.read(reinterpret_cast<char*>(&envelope), sizeof(envelope));
#else
char data[4 * 8];
file_.read(data,4 * 8);
double minx, miny, maxx, maxy;
read_double_ndr(data + 0 * 8, minx);
read_double_ndr(data + 1 * 8, miny);
read_double_ndr(data + 2 * 8, maxx);
read_double_ndr(data + 3 * 8, maxy);
envelope.init(minx, miny, maxx, maxy);
#endif
}
bool proj_transform::backward (box2d<double> & box) const
{
if (is_source_equal_dest_)
return true;
double minx = box.minx();
double miny = box.miny();
double maxx = box.maxx();
double maxy = box.maxy();
double z = 0.0;
if (!backward(minx,miny,z))
return false;
if (!backward(maxx,maxy,z))
return false;
box.init(minx,miny,maxx,maxy);
return true;
}
