zeni/go-chart
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potential fix for issue with large deltas rounding the y axis

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This commit is contained in:
Will Charczuk 2017-03-05 23:20:58 -08:00
parent b713ff85cc
commit 182d5a199b
3 changed files with 13 additions and 26 deletions
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16
chart.go
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@ -98,11 +98,11 @@ func (c Chart) Render(rp RendererProvider, w io.Writer) error {
xr, yr, yra := c.getRanges()
canvasBox := c.getDefaultCanvasBox()
xf, yf, yfa := c.getValueFormatters()
xr, yr, yra = c.setRangeDomains(canvasBox, xr, yr, yra)
err = c.checkRanges(xr, yr, yra)
if err != nil {
// (try to) dump the raw background to the stream.
r.Save(w)
return err
}
@ -260,11 +260,15 @@ func (c Chart) getRanges() (xrange, yrange, yrangeAlt Range) {
yrange.SetMin(miny)
yrange.SetMax(maxy)
delta := yrange.GetDelta()
roundTo := Math.GetRoundToForDelta(delta)
rmin, rmax := Math.RoundDown(yrange.GetMin(), roundTo), Math.RoundUp(yrange.GetMax(), roundTo)
yrange.SetMin(rmin)
yrange.SetMax(rmax)
// only round if we're showing the axis
if c.YAxis.Style.Show {
delta := yrange.GetDelta()
roundTo := Math.GetRoundToForDelta(delta)
rmin, rmax := Math.RoundDown(yrange.GetMin(), roundTo), Math.RoundUp(yrange.GetMax(), roundTo)
yrange.SetMin(rmin)
yrange.SetMax(rmax)
}
}
if len(c.YAxisSecondary.Ticks) > 0 {