zeni/go-chart
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small bugfix for edge case.

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This commit is contained in:
Will Charczuk 2016-07-16 23:45:28 -07:00
parent 3432bd9443
commit d455b775da
3 changed files with 45 additions and 0 deletions
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4
chart.go
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@ -104,7 +104,11 @@ func (c Chart) Render(rp RendererProvider, w io.Writer) error {
xt, yt, yta = c.getAxesTicks(r, xr, yr, yra, xf, yf, yfa)
canvasBox = c.getAxisAdjustedCanvasBox(r, canvasBox, xr, yr, yra, xt, yt, yta)
xr, yr, yra = c.setRangeDomains(canvasBox, xr, yr, yra)
// do a second pass in case things haven't settled yet.
xt, yt, yta = c.getAxesTicks(r, xr, yr, yra, xf, yf, yfa)
canvasBox = c.getAxisAdjustedCanvasBox(r, canvasBox, xr, yr, yra, xt, yt, yta)
xr, yr, yra = c.setRangeDomains(canvasBox, xr, yr, yra)
}
if c.hasAnnotationSeries() {

39
examples/timeseries/main.go
View file

@ -42,7 +42,46 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
graph.Render(chart.PNG, res)
}
func drawCustomChart(res http.ResponseWriter, req *http.Request) {
/*
This is basically the other timeseries example, except we switch to hour intervals and specify a different formatter from default for the xaxis tick labels.
*/
graph := chart.Chart{
XAxis: chart.XAxis{
Style: chart.Style{
Show: true,
},
ValueFormatter: chart.TimeHourValueFormatter,
},
Series: []chart.Series{
chart.TimeSeries{
XValues: []time.Time{
time.Now().Add(-10 * time.Hour),
time.Now().Add(-9 * time.Hour),
time.Now().Add(-8 * time.Hour),
time.Now().Add(-7 * time.Hour),
time.Now().Add(-6 * time.Hour),
time.Now().Add(-5 * time.Hour),
time.Now().Add(-4 * time.Hour),
time.Now().Add(-3 * time.Hour),
time.Now().Add(-2 * time.Hour),
time.Now().Add(-1 * time.Hour),
time.Now(),
},
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0},
},
},
}
res.Header().Set("Content-Type", "image/png")
graph.Render(chart.PNG, res)
}
func main() {
http.HandleFunc("/", drawChart)
http.HandleFunc("/favico.ico", func(res http.ResponseWriter, req *http.Request) {
res.Write([]byte{})
})
http.HandleFunc("/custom", drawCustomChart)
http.ListenAndServe(":8080", nil)
}

2
xaxis.go
View file

@ -78,6 +78,7 @@ func (xa XAxis) GetGridLines(ticks []Tick) []GridLine {
func (xa XAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, ticks []Tick) Box {
r.SetStrokeColor(xa.Style.GetStrokeColor(defaults.StrokeColor))
r.SetStrokeWidth(xa.Style.GetStrokeWidth(defaults.StrokeWidth))
r.SetStrokeDashArray(xa.Style.GetStrokeDashArray())
r.SetFont(xa.Style.GetFont(defaults.GetFont()))
r.SetFontColor(xa.Style.GetFontColor(DefaultAxisColor))
r.SetFontSize(xa.Style.GetFontSize(defaults.GetFontSize()))
@ -111,6 +112,7 @@ func (xa XAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, tic
func (xa XAxis) Render(r Renderer, canvasBox Box, ra Range, defaults Style, ticks []Tick) {
r.SetStrokeColor(xa.Style.GetStrokeColor(defaults.StrokeColor))
r.SetStrokeWidth(xa.Style.GetStrokeWidth(defaults.StrokeWidth))
r.SetStrokeDashArray(xa.Style.GetStrokeDashArray())
r.SetFont(xa.Style.GetFont(defaults.GetFont()))
r.SetFontColor(xa.Style.GetFontColor(DefaultAxisColor))
r.SetFontSize(xa.Style.GetFontSize(defaults.GetFontSize()))