void
ChartRenderer::ScaleYFromData(const LeastSquares &lsdata)
{
if (lsdata.IsEmpty())
return;
if (y.unscaled) {
y.min = lsdata.GetMinY();
y.max = lsdata.GetMaxY();
y.unscaled = false;
} else {
y.min = std::min(y.min, lsdata.GetMinY());
y.max = std::max(y.max, lsdata.GetMaxY());
}
if (lsdata.HasResult()) {
auto y0 = lsdata.GetYAtMinX();
auto y1 = lsdata.GetYAtMaxX();
y.min = std::min({y.min, y0, y1});
y.max = std::max({y.max, y0, y1});
}
if (fabs(y.max - y.min) > 50) {
y.scale = (y.max - y.min);
if (y.scale > 0)
y.scale = (rc.bottom - rc.top - padding_bottom) / y.scale;
} else {
y.scale = 2000;
}
}
void
ChartRenderer::DrawTrendN(const LeastSquares &lsdata, ChartLook::Style style)
{
if (!lsdata.HasResult())
return;
if (x.unscaled || y.unscaled)
return;
double xmin = 0.5;
double xmax = lsdata.GetCount() + 0.5;
double ymin = lsdata.GetYAtMinX();
double 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};
}