void
ChartRenderer::ScaleXFromData(const LeastSquares &lsdata)
{
if (lsdata.IsEmpty())
return;
if (x.unscaled) {
x.min = lsdata.GetMinX();
x.max = lsdata.GetMaxX();
x.unscaled = false;
} else {
x.min = std::min(x.min, lsdata.GetMinX());
x.max = std::max(x.max, lsdata.GetMaxX());
}
x.scale = (x.max - x.min);
if (x.scale > 0)
x.scale = (rc.right - rc.left - padding_left) / x.scale;
}
void
ChartRenderer::DrawTrend(const LeastSquares &lsdata, ChartLook::Style style)
{
if (!lsdata.HasResult())
return;
if (x.unscaled || y.unscaled)
return;
auto xmin = lsdata.GetMinX();
auto xmax = lsdata.GetMaxX();
auto ymin = lsdata.GetYAtMinX();
auto ymax = lsdata.GetYAtMaxX();
DrawLine(xmin, ymin, xmax, ymax, look.GetPen(style));
}
/**
* Convert a #LeastSquares to a #WaveInfo. Returns
* WaveInfo::Undefined() if there is no valid result in the
* #LeastSquares instance.
*/
gcc_pure
static WaveInfo
GetWaveInfo(const LeastSquares &ls, const FlatProjection &projection,
double time)
{
if (!ls.HasResult())
return WaveInfo::Undefined();
const FlatPoint flat_location(ls.GetMiddleX(), ls.GetAverageY());
const GeoPoint location(projection.Unproject(flat_location));
const GeoPoint a(projection.Unproject(FlatPoint(ls.GetMinX(),
ls.GetYAtMinX())));
const GeoPoint b(projection.Unproject(FlatPoint(ls.GetMaxX(),
ls.GetYAtMaxX())));
Angle bearing = a.Bearing(b);
Angle normal = (bearing + Angle::QuarterCircle()).AsBearing();
return {location, a, b, normal, time};
}