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Auto width barchart #123

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Auto width barchart #123

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255dde8
auto width BarChart setting Width=-1
Jul 26, 2019
5b9d15c
algo autowidth
Jul 26, 2019
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1 change: 1 addition & 0 deletions _examples/bar_chart/main.go
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Expand Up @@ -19,6 +19,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
},
},
Height: 512,
Width: -1,
BarWidth: 60,
XAxis: chart.StyleShow(),
YAxis: chart.YAxis{
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15 changes: 15 additions & 0 deletions bar_chart.go
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Expand Up @@ -61,6 +61,8 @@ func (bc BarChart) GetFont() *truetype.Font {
func (bc BarChart) GetWidth() int {
if bc.Width == 0 {
return DefaultChartWidth
} else if bc.Width == -1 {
return bc.autoWidth()
}
return bc.Width
}
Expand Down Expand Up @@ -89,6 +91,19 @@ func (bc BarChart) GetBarWidth() int {
return bc.BarWidth
}

func (bc BarChart) autoWidth() (totalWidth int) {

totalWidth = 0
barWidth := bc.GetBarWidth()
barSpacing := bc.GetBarSpacing()

for _, _ = range bc.Bars {
totalWidth += barWidth + barSpacing
}

return
}

// Render renders the chart with the given renderer to the given io.Writer.
func (bc BarChart) Render(rp RendererProvider, w io.Writer) error {
if len(bc.Bars) == 0 {
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