Vector4 SampleColor(float x, float y)
{
int ix = (int)Mathf.Floor(x);
int iy = (int)Mathf.Floor(y);
x -= ix;
y -= iy;
float cx = 1.0f - x;
float cy = 1.0f - y;
var c1 = Source.Get(ix, iy);
var c2 = Source.Get(ix + 1, iy);
var c3 = Source.Get(ix, iy + 1);
var c4 = Source.Get(ix + 1, iy + 1);
var color = new Vector4
(
(c1.x * cx + c2.x * x) * cy + (c3.x * cx + c4.x * x) * y,
(c1.y * cx + c2.y * x) * cy + (c3.y * cx + c4.y * x) * y,
(c1.z * cx + c2.z * x) * cy + (c3.z * cx + c4.z * x) * y,
(c1.w * cx + c2.w * x) * cy + (c3.w * cx + c4.w * x) * y
);
return(color);
}
private Vector4 SampleColor(double lon, double lat)
{
lon = lon / Math.PI * (Source.Width / 2.0);
lat = lat / Math.PI * Source.Height;
int ilon = (int)Math.Floor(lon);
int ilat = (int)Math.Floor(lat);
lon -= ilon;
lat -= ilat;
double clon = 1.0 - lon;
double clat = 1.0 - lat;
var c1 = Source.Get((ilon + Source.Width) % Source.Width, ilat);
var c2 = Source.Get((ilon + Source.Width + 1) % Source.Width, ilat);
var c3 = Source.Get((ilon + Source.Width) % Source.Width, ilat + 1);
var c4 = Source.Get((ilon + Source.Width + 1) % Source.Width, ilat + 1);
var color = new Vector4
(
(float)((c1.x * clon + c2.x * lon) * clat + (c3.x * clon + c4.x * lon) * lat),
(float)((c1.y * clon + c2.y * lon) * clat + (c3.y * clon + c4.y * lon) * lat),
(float)((c1.z * clon + c2.z * lon) * clat + (c3.z * clon + c4.z * lon) * lat),
(float)((c1.w * clon + c2.w * lon) * clat + (c3.w * clon + c4.w * lon) * lat)
);
return(color);
}
public float SampleHeight(float x, float y)
{
int ix = (int)Mathf.Floor(x);
int iy = (int)Mathf.Floor(y);
x -= ix;
y -= iy;
float cx = 1.0f - x;
float cy = 1.0f - y;
float h1 = Source.Get(ix, iy).x;
float h2 = Source.Get(ix + 1, iy).x;
float h3 = Source.Get(ix, iy + 1).x;
float h4 = Source.Get(ix + 1, iy + 1).x;
return((h1 * cx + h2 * x) * cy + (h3 * cx + h4 * x) * y);
}
private float SampleHeight(double lon, double lat)
{
lon = lon / Math.PI * (Source.Width / 2.0);
lat = lat / Math.PI * Source.Height;
int ilon = (int)Math.Floor(lon);
int ilat = (int)Math.Floor(lat);
lon -= ilon;
lat -= ilat;
double clon = 1.0 - lon;
double clat = 1.0 - lat;
float h1 = Source.Get((ilon + Source.Width) % Source.Width, ilat).x;
float h2 = Source.Get((ilon + Source.Width + 1) % Source.Width, ilat).x;
float h3 = Source.Get((ilon + Source.Width) % Source.Width, ilat + 1).x;
float h4 = Source.Get((ilon + Source.Width + 1) % Source.Width, ilat + 1).x;
return((float)((h1 * clon + h2 * lon) * clat + (h3 * clon + h4 * lon) * lat));
}