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draw circle if single value; do not position text on negative coordinates (#82)

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Bernhard Reisenberger 2018-10-12 02:21:06 +02:00 committed by Will Charczuk
parent 865ff54ab9
commit 6735e8990a
1 changed files with 23 additions and 9 deletions
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32
pie_chart.go
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@ -138,19 +138,26 @@ func (pc PieChart) drawSlices(r Renderer, canvasBox Box, values []Value) {
// draw the pie slices
var rads, delta, delta2, total float64
var lx, ly int
for index, v := range values {
v.Style.InheritFrom(pc.stylePieChartValue(index)).WriteToRenderer(r)
if len(values) == 1 {
pc.stylePieChartValue(0).WriteToRenderer(r)
r.MoveTo(cx, cy)
rads = util.Math.PercentToRadians(total)
delta = util.Math.PercentToRadians(v.Value)
r.Circle(radius, cx, cy)
} else {
for index, v := range values {
v.Style.InheritFrom(pc.stylePieChartValue(index)).WriteToRenderer(r)
r.ArcTo(cx, cy, radius, radius, rads, delta)
r.MoveTo(cx, cy)
rads = util.Math.PercentToRadians(total)
delta = util.Math.PercentToRadians(v.Value)
r.LineTo(cx, cy)
r.Close()
r.FillStroke()
total = total + v.Value
r.ArcTo(cx, cy, radius, radius, rads, delta)
r.LineTo(cx, cy)
r.Close()
r.FillStroke()
total = total + v.Value
}
}
// draw the labels
@ -166,6 +173,13 @@ func (pc PieChart) drawSlices(r Renderer, canvasBox Box, values []Value) {
lx = lx - (tb.Width() >> 1)
ly = ly + (tb.Height() >> 1)
if lx < 0 {
lx = 0
}
if ly < 0 {
lx = 0
}
r.Text(v.Label, lx, ly)
}
total = total + v.Value