// 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)
}
da.StrokeLines(pts.LineStyle, da.ClipLinesXY(ps)...)
}
func (pts *VerticalLine) Plot(da plot.DrawArea, plt *plot.Plot) {
trX, _ := plt.Transforms(&da)
ps := make([]plot.Point, 2)
ps[0].X = trX(pts.X)
ps[1].X = ps[0].X
ps[0].Y = da.Min.Y
ps[1].Y = da.Max().Y
da.StrokeLines(pts.LineStyle, da.ClipLinesXY(ps)...)
}
// Plot implements the Plotter interface, drawing a line
// that connects each point in the Line.
func (f *Function) Plot(da plot.DrawArea, p *plot.Plot) {
trX, trY := p.Transforms(&da)
d := (p.X.Max - p.X.Min) / float64(f.Samples-1)
line := make([]plot.Point, f.Samples)
for i := range line {
x := p.X.Min + float64(i)*d
line[i].X = trX(x)
line[i].Y = trY(f.F(x))
}
da.StrokeLines(f.LineStyle, da.ClipLinesXY(line)...)
}
func (pts *HorizontalLine) Plot(da plot.DrawArea, plt *plot.Plot) {
_, trY := plt.Transforms(&da)
ps := make([]plot.Point, 2)
ps[0].X = da.Min.X
ps[1].X = da.Max().X
ps[0].Y = trY(pts.Y)
ps[1].Y = ps[0].Y
da.StrokeLines(pts.LineStyle, da.ClipLinesXY(ps)...)
}
// 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)...)
}
