// Plot implements the plot.Plotter interface. func (b *BarChart) Plot(c draw.Canvas, plt *plot.Plot) { trX, trY := plt.Transforms(&c) for i, ht := range b.Values { x := b.XMin + float64(i) xmin := trX(float64(x)) if !c.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 := []draw.Point{ {xmin, ymin}, {xmin, ymax}, {xmax, ymax}, {xmax, ymin}, } poly := c.ClipPolygonY(pts) c.FillPolygon(b.Color, poly) pts = append(pts, draw.Point{xmin, ymin}) outline := c.ClipLinesY(pts) c.StrokeLines(b.LineStyle, outline...) } }
// Plot implements the plot.Plotter interface. func (b *BarChart) Plot(c draw.Canvas, plt *plot.Plot) { trCat, trVal := plt.Transforms(&c) if b.Horizontal { trCat, trVal = trVal, trCat } for i, ht := range b.Values { catVal := b.XMin + float64(i) catMin := trCat(float64(catVal)) if !b.Horizontal { if !c.ContainsX(catMin) { continue } } else { if !c.ContainsY(catMin) { continue } } catMin = catMin - b.Width/2 + b.Offset catMax := catMin + b.Width bottom := b.stackedOn.BarHeight(i) valMin := trVal(bottom) valMax := trVal(bottom + ht) var pts []draw.Point var poly []draw.Point if !b.Horizontal { pts = []draw.Point{ {catMin, valMin}, {catMin, valMax}, {catMax, valMax}, {catMax, valMin}, } poly = c.ClipPolygonY(pts) } else { pts = []draw.Point{ {valMin, catMin}, {valMin, catMax}, {valMax, catMax}, {valMax, catMin}, } poly = c.ClipPolygonX(pts) } c.FillPolygon(b.Color, poly) var outline [][]draw.Point if !b.Horizontal { pts = append(pts, draw.Point{X: catMin, Y: valMin}) outline = c.ClipLinesY(pts) } else { pts = append(pts, draw.Point{X: valMin, Y: catMin}) outline = c.ClipLinesX(pts) } c.StrokeLines(b.LineStyle, outline...) } }
// Plot implements the Plotter interface, drawing labels. func (e *YErrorBars) Plot(c draw.Canvas, p *plot.Plot) { trX, trY := p.Transforms(&c) for i, err := range e.YErrors { x := trX(e.XYs[i].X) ylow := trY(e.XYs[i].Y - math.Abs(err.Low)) yhigh := trY(e.XYs[i].Y + math.Abs(err.High)) bar := c.ClipLinesY([]draw.Point{{x, ylow}, {x, yhigh}}) c.StrokeLines(e.LineStyle, bar...) e.drawCap(&c, x, ylow) e.drawCap(&c, x, yhigh) } }
func (b *BarChart) Thumbnail(c *draw.Canvas) { pts := []draw.Point{ {c.Min.X, c.Min.Y}, {c.Min.X, c.Max.Y}, {c.Max.X, c.Max.Y}, {c.Max.X, c.Min.Y}, } poly := c.ClipPolygonY(pts) c.FillPolygon(b.Color, poly) pts = append(pts, draw.Point{c.Min.X, c.Min.Y}) outline := c.ClipLinesY(pts) c.StrokeLines(b.LineStyle, outline...) }
// Plot draws the BoxPlot on Canvas c and Plot plt. func (b *BoxPlot) Plot(c draw.Canvas, plt *plot.Plot) { if b.Horizontal { b := &horizBoxPlot{b} b.Plot(c, plt) return } trX, trY := plt.Transforms(&c) x := trX(b.Location) if !c.ContainsX(x) { return } x += b.Offset med := trY(b.Median) q1 := trY(b.Quartile1) q3 := trY(b.Quartile3) aLow := trY(b.AdjLow) aHigh := trY(b.AdjHigh) box := c.ClipLinesY([]draw.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}, }) c.StrokeLines(b.BoxStyle, box...) medLine := c.ClipLinesY([]draw.Point{ {x - b.Width/2, med}, {x + b.Width/2, med}, }) c.StrokeLines(b.MedianStyle, medLine...) cap := b.CapWidth / 2 whisks := c.ClipLinesY([]draw.Point{{x, q3}, {x, aHigh}}, []draw.Point{{x - cap, aHigh}, {x + cap, aHigh}}, []draw.Point{{x, q1}, {x, aLow}}, []draw.Point{{x - cap, aLow}, {x + cap, aLow}}) c.StrokeLines(b.WhiskerStyle, whisks...) for _, out := range b.Outside { y := trY(b.Value(out)) if c.ContainsY(y) { c.DrawGlyphNoClip(b.GlyphStyle, draw.Point{X: x, Y: y}) } } }