small bugfix for edge case.
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3432bd9443
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3 changed files with 45 additions and 0 deletions
4
chart.go
4
chart.go
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@ -104,7 +104,11 @@ func (c Chart) Render(rp RendererProvider, w io.Writer) error {
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xt, yt, yta = c.getAxesTicks(r, xr, yr, yra, xf, yf, yfa)
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canvasBox = c.getAxisAdjustedCanvasBox(r, canvasBox, xr, yr, yra, xt, yt, yta)
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xr, yr, yra = c.setRangeDomains(canvasBox, xr, yr, yra)
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// do a second pass in case things haven't settled yet.
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xt, yt, yta = c.getAxesTicks(r, xr, yr, yra, xf, yf, yfa)
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canvasBox = c.getAxisAdjustedCanvasBox(r, canvasBox, xr, yr, yra, xt, yt, yta)
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xr, yr, yra = c.setRangeDomains(canvasBox, xr, yr, yra)
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}
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if c.hasAnnotationSeries() {
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@ -42,7 +42,46 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
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graph.Render(chart.PNG, res)
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}
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func drawCustomChart(res http.ResponseWriter, req *http.Request) {
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/*
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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.
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*/
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graph := chart.Chart{
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XAxis: chart.XAxis{
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Style: chart.Style{
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Show: true,
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},
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ValueFormatter: chart.TimeHourValueFormatter,
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},
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Series: []chart.Series{
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chart.TimeSeries{
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XValues: []time.Time{
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time.Now().Add(-10 * time.Hour),
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time.Now().Add(-9 * time.Hour),
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time.Now().Add(-8 * time.Hour),
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time.Now().Add(-7 * time.Hour),
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time.Now().Add(-6 * time.Hour),
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time.Now().Add(-5 * time.Hour),
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time.Now().Add(-4 * time.Hour),
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time.Now().Add(-3 * time.Hour),
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time.Now().Add(-2 * time.Hour),
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time.Now().Add(-1 * time.Hour),
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time.Now(),
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},
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YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0},
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},
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},
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}
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res.Header().Set("Content-Type", "image/png")
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graph.Render(chart.PNG, res)
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}
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func main() {
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http.HandleFunc("/", drawChart)
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http.HandleFunc("/favico.ico", func(res http.ResponseWriter, req *http.Request) {
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res.Write([]byte{})
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})
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http.HandleFunc("/custom", drawCustomChart)
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http.ListenAndServe(":8080", nil)
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}
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2
xaxis.go
2
xaxis.go
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@ -78,6 +78,7 @@ func (xa XAxis) GetGridLines(ticks []Tick) []GridLine {
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func (xa XAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, ticks []Tick) Box {
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r.SetStrokeColor(xa.Style.GetStrokeColor(defaults.StrokeColor))
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r.SetStrokeWidth(xa.Style.GetStrokeWidth(defaults.StrokeWidth))
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r.SetStrokeDashArray(xa.Style.GetStrokeDashArray())
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r.SetFont(xa.Style.GetFont(defaults.GetFont()))
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r.SetFontColor(xa.Style.GetFontColor(DefaultAxisColor))
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r.SetFontSize(xa.Style.GetFontSize(defaults.GetFontSize()))
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@ -111,6 +112,7 @@ func (xa XAxis) Measure(r Renderer, canvasBox Box, ra Range, defaults Style, tic
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func (xa XAxis) Render(r Renderer, canvasBox Box, ra Range, defaults Style, ticks []Tick) {
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r.SetStrokeColor(xa.Style.GetStrokeColor(defaults.StrokeColor))
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r.SetStrokeWidth(xa.Style.GetStrokeWidth(defaults.StrokeWidth))
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r.SetStrokeDashArray(xa.Style.GetStrokeDashArray())
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r.SetFont(xa.Style.GetFont(defaults.GetFont()))
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r.SetFontColor(xa.Style.GetFontColor(DefaultAxisColor))
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r.SetFontSize(xa.Style.GetFontSize(defaults.GetFontSize()))
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