示例#1
0
// 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)...)
	}
}
示例#2
0
// 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)...)
}