/**
* Checks if the size difference of any dimension is more than a
* factor of two. This is used to check whether the terrain has to be
* redrawn after zooming in.
*/
static bool
IsLargeSizeDifference(const GeoBounds &a, const GeoBounds &b)
{
assert(a.IsValid());
assert(b.IsValid());
return a.GetWidth().Native() > Double(b.GetWidth().Native()) ||
a.GetHeight().Native() > Double(b.GetHeight().Native());
}
void
RasterProjection::Set(const GeoBounds &bounds,
unsigned width, unsigned height)
{
x_scale = double(width) / bounds.GetWidth().Native();
left = AngleToWidth(bounds.GetWest());
y_scale = double(height) / bounds.GetHeight().Native();
top = AngleToHeight(bounds.GetNorth());
}
void
RasterProjection::Set(const GeoBounds &bounds,
unsigned width, unsigned height)
{
x_scale = fixed(width) / bounds.GetWidth().Native();
left = int(bounds.GetWest().Native() * x_scale);
y_scale = fixed(height) / bounds.GetHeight().Native();
top = int(bounds.GetNorth().Native() * y_scale);
}