Example #1
0
// Plot implements the plot.Plotter interface.
func (b *BarChart) Plot(da plot.DrawArea, plt *plot.Plot) {
	trX, trY := plt.Transforms(&da)

	for i, ht := range b.Values {
		x := b.XMin + float64(i)
		xmin := trX(float64(x))
		if !da.ContainsX(xmin) {
			continue
		}
		xmin = xmin - b.Width/2 + b.Offset
		xmax := xmin + b.Width
		bottom := b.stackedOn.BarHeight(i)
		ymin := trY(bottom)
		ymax := trY(bottom + ht)

		pts := []plot.Point{
			{xmin, ymin},
			{xmin, ymax},
			{xmax, ymax},
			{xmax, ymin},
		}
		poly := da.ClipPolygonY(pts)
		da.FillPolygon(b.Color, poly)

		pts = append(pts, plot.Point{xmin, ymin})
		outline := da.ClipLinesY(pts)
		da.StrokeLines(b.LineStyle, outline...)
	}
}
Example #2
0
func (b *BoxPlot) Plot(da plot.DrawArea, plt *plot.Plot) {
	trX, trY := plt.Transforms(&da)
	x := trX(b.Location)
	if !da.ContainsX(x) {
		return
	}

	med := trY(b.Median)
	q1 := trY(b.Quartile1)
	q3 := trY(b.Quartile3)
	aLow := trY(b.AdjLow)
	aHigh := trY(b.AdjHigh)

	box := da.ClipLinesY([]plot.Point{
		{x - b.Width/2, q1},
		{x - b.Width/2, q3},
		{x + b.Width/2, q3},
		{x + b.Width/2, q1},
		{x - b.Width/2 - b.BoxStyle.Width/2, q1},
	})
	da.StrokeLines(b.BoxStyle, box...)

	medLine := da.ClipLinesY([]plot.Point{
		{x - b.Width/2, med},
		{x + b.Width/2, med},
	})
	da.StrokeLines(b.MedianStyle, medLine...)

	cap := b.CapWidth / 2
	whisks := da.ClipLinesY([]plot.Point{{x, q3}, {x, aHigh}},
		[]plot.Point{{x - cap, aHigh}, {x + cap, aHigh}},
		[]plot.Point{{x, q1}, {x, aLow}},
		[]plot.Point{{x - cap, aLow}, {x + cap, aLow}})
	da.StrokeLines(b.WhiskerStyle, whisks...)

	for _, out := range b.Outside {
		y := trY(b.Value(out))
		da.DrawGlyph(b.GlyphStyle, plot.Point{x, y})
	}
}