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example code.

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Will Charczuk 2016-07-12 22:18:34 -07:00
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@ -72,7 +72,7 @@ The key areas to note are that we have to explicitly turn on two features, the a
# Alternate Usage
You can alternately turn a bunch of features off and constrain the proportions to something like a spark line:
You can alternately leave a bunch of features turned off and constrain the proportions to something like a spark line:
![](https://raw.githubusercontent.com/wcharczuk/go-chart/master/images/tvix_ltm.png)
@ -101,6 +101,77 @@ graph.Render(chart.PNG, buffer)
It is also possible to draw series against 2 separate y-axis with their own ranges (usually good for comparison charts).
In order to map the series to an alternate axis make sure to set the `YAxis` property of the series to `YAxisSecondary`.
```go
graph := chart.Chart{
Title: stock.Name,
TitleStyle: chart.Style{
Show: false,
},
Width: width,
Height: height,
XAxis: chart.XAxis{
Style: chart.Style{
Show: showAxes,
},
},
YAxis: chart.YAxis{
Style: chart.Style{
Show: showAxes,
},
},
Series: []chart.Series{
chart.TimeSeries{
Name: "vea",
XValues: vx,
YValues: vy,
Style: chart.Style{
StrokeColor: chart.GetDefaultSeriesStrokeColor(0),
FillColor: chart.GetDefaultSeriesStrokeColor(0).WithAlpha(64),
},
},
chart.TimeSeries{
Name: "spy",
XValues: cx,
YValues: cy,
YAxis: chart.YAxisSecondary, // key (!)
Style: chart.Style{
StrokeColor: chart.GetDefaultSeriesStrokeColor(1),
FillColor: chart.GetDefaultSeriesStrokeColor(1).WithAlpha(64),
},
},
chart.AnnotationSeries{
Name: fmt.Sprintf("%s - Last Value", "vea"),
Style: chart.Style{
Show: true,
StrokeColor: chart.GetDefaultSeriesStrokeColor(0),
},
Annotations: []chart.Annotation{
chart.Annotation{
X: float64(vx[len(vx)-1].Unix()),
Y: vy[len(vy)-1],
Label: fmt.Sprintf("%s - %s", "vea", chart.FloatValueFormatter(vy[len(vy)-1])),
},
},
},
chart.AnnotationSeries{
Name: fmt.Sprintf("%s - Last Value", "goog"),
Style: chart.Style{
Show: true,
StrokeColor: chart.GetDefaultSeriesStrokeColor(1),
},
YAxis: chart.YAxisSecondary, // key (!)
Annotations: []chart.Annotation{
chart.Annotation{
X: float64(cx[len(cx)-1].Unix()),
Y: cy[len(cy)-1],
Label: fmt.Sprintf("%s - %s", "goog", chart.FloatValueFormatter(cy[len(cy)-1])),
},
},
},
},
}
```
# Design Philosophy
I wanted to make a charting library that used only native golang, that could be stood up on a server (i.e. it had built in fonts).