private coord Ll(coord px, int zoom)
{
//if (isFloat(zoom))
//{
var size = this.size * Math.Pow(2, zoom);
var bc = (size / 360);
var cc = (size / (2 * Math.PI));
var zc = size / 2;
var g = (px.y - zc) / -cc;
var _lon = (px.x - zc) / bc;
var _lat = R2D * (2 * Math.Atan(Math.Exp(g)) - 0.5 * Math.PI);
return(new coord()
{
x = _lat, y = _lon
});
//}
//else
//{
// var g = (px[1] - this.zc[zoom]) / (-this.Cc[zoom]);
// var lon = (px[0] - this.zc[zoom]) / this.Bc[zoom];
// var lat = R2D * (2 * Math.atan(Math.exp(g)) - 0.5 * Math.PI);
// return [lon, lat];
//}
}
public bbox bbox(double x, double y, int zoom, bool tms_style, string srs)
{
// Convert xyz into bbox with srs WGS84
if (tms_style)
{
y = (Math.Pow(2, zoom) - 1) - y;
}
// Use +y to make sure it's a number to avoid inadvertent concatenation.
var ll = new coord()
{
x = x * this.size, y = (+y + 1) * this.size
}; // lower left
// Use +x to make sure it's a number to avoid inadvertent concatenation.
var ur = new coord()
{
x = (+x + 1) * this.size, y = y * this.size
}; // upper right
var bbox = new bbox()
{
ll = this.Ll(ll, zoom), ur = (this.Ll(ur, zoom))
};
// If web mercator requested reproject to 900913.
//if (srs == "900913")
//{
// return this.convert(bbox, "900913");
//}
//else
//{
// return bbox;
//}
return(bbox);
}
private coord px(coord ll, int zoom)
{
//if (isFloat(zoom))
//{
var size = this.size * Math.Pow(2, zoom);
var d = size / 2;
var bc = (size / 360);
var cc = (size / (2 * Math.PI));
var ac = size;
var f = Math.Min(Math.Max(Math.Sin(D2R * ll.y), -0.9999), 0.9999);
var x = d + ll.x * bc;
var y = d + 0.5 * Math.Log((1 + f) / (1 - f)) * -cc;
if (x > ac)
{
x = ac;
}
if (y > ac)
{
y = ac;
}
//(x < 0) && (x = 0);
//(y < 0) && (y = 0);
return(new coord()
{
x = x, y = y
});
//}
//else
//{
// var d = this.zc[zoom];
// var f = Math.min(Math.max(Math.sin(D2R * ll[1]), -0.9999), 0.9999);
// var x = Math.round(d + ll[0] * this.Bc[zoom]);
// var y = Math.round(d + 0.5 * Math.log((1 + f) / (1 - f)) * (-this.Cc[zoom]));
// (x > this.Ac[zoom]) && (x = this.Ac[zoom]);
// (y > this.Ac[zoom]) && (y = this.Ac[zoom]);
// //(x < 0) && (x = 0);
// //(y < 0) && (y = 0);
// return [x, y];
//}
}