// Plot implements the Plotter interface, drawing a line
// that connects each point in the Line.
func (h *Histogram) Plot(da plot.DrawArea, p *plot.Plot) {
trX, trY := p.Transforms(&da)
for _, bin := range h.Bins {
pts := []plot.Point{
{trX(bin.Min), trY(0)},
{trX(bin.Max), trY(0)},
{trX(bin.Max), trY(bin.Weight)},
{trX(bin.Min), trY(bin.Weight)},
}
if h.FillColor != nil {
da.FillPolygon(h.FillColor, da.ClipPolygonXY(pts))
}
pts = append(pts, plot.Pt(trX(bin.Min), trY(0)))
da.StrokeLines(h.LineStyle, da.ClipLinesXY(pts)...)
}
}
// Plot draws the Line, implementing the plot.Plotter
// interface.
func (pts *Line) Plot(da plot.DrawArea, plt *plot.Plot) {
trX, trY := plt.Transforms(&da)
ps := make([]plot.Point, len(pts.XYs))
for i, p := range pts.XYs {
ps[i].X = trX(p.X)
ps[i].Y = trY(p.Y)
}
if pts.ShadeColor != nil && len(ps) > 0 {
da.SetColor(*pts.ShadeColor)
minY := trY(plt.Y.Min)
var pa vg.Path
pa.Move(ps[0].X, minY)
for i := range pts.XYs {
pa.Line(ps[i].X, ps[i].Y)
}
pa.Line(ps[len(pts.XYs)-1].X, minY)
pa.Close()
da.Fill(pa)
}
da.StrokeLines(pts.LineStyle, da.ClipLinesXY(ps)...)
}