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Show value of each bar on top of it #585

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Show value of each bar on top of it #585

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46da50f
Show value of the barchart on top of each bar
agzuniverse Mar 11, 2020
fc5524a
Add a ShowValue option to BarChart struct
agzuniverse Mar 11, 2020
d5ee20b
Cut off the bar chart labels at 2 places after decimal
agzuniverse Mar 11, 2020
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15 changes: 15 additions & 0 deletions plotter/barchart.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ package plotter

import (
"errors"
"fmt"
"image/color"
"math"

Expand Down Expand Up @@ -48,6 +49,10 @@ type BarChart struct {
// stackedOn is the bar chart upon which
// this bar chart is stacked.
stackedOn *BarChart

// ShowValue determines whether the value of the bars should be
// shown above it or not.
ShowValue bool
}

// NewBarChart returns a new bar chart with a single bar for each value.
Expand Down Expand Up @@ -119,6 +124,8 @@ func (b *BarChart) Plot(c draw.Canvas, plt *plot.Plot) {
bottom := b.stackedOn.BarHeight(i)
valMin := trVal(bottom)
valMax := trVal(bottom + ht)
labelX := catMin
labelY := valMax

var pts []vg.Point
var poly []vg.Point
Expand All @@ -138,6 +145,8 @@ func (b *BarChart) Plot(c draw.Canvas, plt *plot.Plot) {
{valMax, catMin},
}
poly = c.ClipPolygonX(pts)
labelX = valMax
labelY = catMin
}
c.FillPolygon(b.Color, poly)

Expand All @@ -150,6 +159,12 @@ func (b *BarChart) Plot(c draw.Canvas, plt *plot.Plot) {
outline = c.ClipLinesX(pts)
}
c.StrokeLines(b.LineStyle, outline...)
if b.ShowValue {
// Display the value of each bar above it
barLabel := fmt.Sprintf("%.2f", ht)
ft, _ := vg.MakeFont(plot.DefaultFont, 10)
c.FillText(draw.TextStyle{Color: color.Black, Font: ft}, vg.Point{X: labelX, Y: labelY}, barLabel)
}
}
}

Expand Down