slight tweak to legend (adds a new style) and example
This commit is contained in:
Will Charczuk
parent
00799114fa
commit
1edf6193b2
111
_examples/legend_left/main.go
Normal file
111
_examples/legend_left/main.go
Normal file
|
|
@ -0,0 +1,111 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"net/http"
|
||||
|
||||
"github.com/wcharczuk/go-chart"
|
||||
)
|
||||
|
||||
func drawChart(res http.ResponseWriter, req *http.Request) {
|
||||
|
||||
/*
|
||||
In this example we add a `Renderable` or a custom component to the `Elements` array.
|
||||
In this specific case it is a pre-built renderable (`CreateLegend`) that draws a legend for the chart's series.
|
||||
If you like, you can use `CreateLegend` as a template for writing your own renderable, or even your own legend.
|
||||
*/
|
||||
|
||||
graph := chart.Chart{
|
||||
XAxis: chart.XAxis{
|
||||
Style: chart.Style{Show: true},
|
||||
},
|
||||
YAxis: chart.YAxis{
|
||||
Style: chart.Style{Show: true},
|
||||
},
|
||||
Background: chart.Style{
|
||||
Padding: chart.Box{
|
||||
Top: 20,
|
||||
Left: 260,
|
||||
},
|
||||
},
|
||||
Series: []chart.Series{
|
||||
chart.ContinuousSeries{
|
||||
Name: "A test series",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
},
|
||||
|
||||
chart.ContinuousSeries{
|
||||
Name: "Another test series",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
},
|
||||
|
||||
chart.ContinuousSeries{
|
||||
Name: "Yet Another test series",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
},
|
||||
|
||||
chart.ContinuousSeries{
|
||||
Name: "Even More series",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
},
|
||||
|
||||
chart.ContinuousSeries{
|
||||
Name: "Foo Bar",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
},
|
||||
|
||||
chart.ContinuousSeries{
|
||||
Name: "Bar Baz",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
},
|
||||
|
||||
chart.ContinuousSeries{
|
||||
Name: "Free Yourself",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
},
|
||||
|
||||
chart.ContinuousSeries{
|
||||
Name: "Wheres Ja?",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
},
|
||||
|
||||
chart.ContinuousSeries{
|
||||
Name: "Fast and the Furious",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{5.0, 4.0, 3.0, 2.0, 1.0},
|
||||
},
|
||||
|
||||
chart.ContinuousSeries{
|
||||
Name: "2 Fast 2 Furious",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{5.0, 4.0, 3.0, 2.0, 1.0},
|
||||
},
|
||||
|
||||
chart.ContinuousSeries{
|
||||
Name: "They only get more fast and more furious",
|
||||
XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
|
||||
YValues: []float64{5.0, 4.0, 3.0, 2.0, 1.0},
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
//note we have to do this as a separate step because we need a reference to graph
|
||||
graph.Elements = []chart.Renderable{
|
||||
chart.LegendLeft(&graph),
|
||||
}
|
||||
|
||||
res.Header().Set("Content-Type", "image/png")
|
||||
graph.Render(chart.PNG, res)
|
||||
}
|
||||
|
||||
func main() {
|
||||
http.HandleFunc("/", drawChart)
|
||||
http.ListenAndServe(":8080", nil)
|
||||
}
|
||||
114
legend.go
114
legend.go
|
|
@ -213,3 +213,117 @@ func LegendThin(c *Chart, userDefaults ...Style) Renderable {
|
|||
}
|
||||
}
|
||||
}
|
||||
|
||||
// LegendLeft is a legend that is designed for longer series lists.
|
||||
func LegendLeft(c *Chart, userDefaults ...Style) Renderable {
|
||||
return func(r Renderer, cb Box, chartDefaults Style) {
|
||||
legendDefaults := Style{
|
||||
FillColor: drawing.ColorWhite,
|
||||
FontColor: DefaultTextColor,
|
||||
FontSize: 8.0,
|
||||
StrokeColor: DefaultAxisColor,
|
||||
StrokeWidth: DefaultAxisLineWidth,
|
||||
}
|
||||
|
||||
var legendStyle Style
|
||||
if len(userDefaults) > 0 {
|
||||
legendStyle = userDefaults[0].InheritFrom(chartDefaults.InheritFrom(legendDefaults))
|
||||
} else {
|
||||
legendStyle = chartDefaults.InheritFrom(legendDefaults)
|
||||
}
|
||||
|
||||
// DEFAULTS
|
||||
legendPadding := Box{
|
||||
Top: 5,
|
||||
Left: 5,
|
||||
Right: 5,
|
||||
Bottom: 5,
|
||||
}
|
||||
lineTextGap := 5
|
||||
lineLengthMinimum := 25
|
||||
|
||||
var labels []string
|
||||
var lines []Style
|
||||
for index, s := range c.Series {
|
||||
if s.GetStyle().IsZero() || s.GetStyle().Show {
|
||||
if _, isAnnotationSeries := s.(AnnotationSeries); !isAnnotationSeries {
|
||||
labels = append(labels, s.GetName())
|
||||
lines = append(lines, s.GetStyle().InheritFrom(c.styleDefaultsSeries(index)))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
legend := Box{
|
||||
Top: 5,
|
||||
Left: 5,
|
||||
// bottom and right will be sized by the legend content + relevant padding.
|
||||
}
|
||||
|
||||
legendContent := Box{
|
||||
Top: legend.Top + legendPadding.Top,
|
||||
Left: legend.Left + legendPadding.Left,
|
||||
Right: legend.Left + legendPadding.Left,
|
||||
Bottom: legend.Top + legendPadding.Top,
|
||||
}
|
||||
|
||||
legendStyle.GetTextOptions().WriteToRenderer(r)
|
||||
|
||||
// measure
|
||||
labelCount := 0
|
||||
for x := 0; x < len(labels); x++ {
|
||||
if len(labels[x]) > 0 {
|
||||
tb := r.MeasureText(labels[x])
|
||||
if labelCount > 0 {
|
||||
legendContent.Bottom += DefaultMinimumTickVerticalSpacing
|
||||
}
|
||||
legendContent.Bottom += tb.Height()
|
||||
right := legendContent.Left + tb.Width() + lineTextGap + lineLengthMinimum
|
||||
legendContent.Right = Math.MaxInt(legendContent.Right, right)
|
||||
labelCount++
|
||||
}
|
||||
}
|
||||
|
||||
legend = legend.Grow(legendContent)
|
||||
legend.Right = legendContent.Right + legendPadding.Right
|
||||
legend.Bottom = legendContent.Bottom + legendPadding.Bottom
|
||||
|
||||
Draw.Box(r, legend, legendStyle)
|
||||
|
||||
legendStyle.GetTextOptions().WriteToRenderer(r)
|
||||
|
||||
ycursor := legendContent.Top
|
||||
tx := legendContent.Left
|
||||
legendCount := 0
|
||||
var label string
|
||||
for x := 0; x < len(labels); x++ {
|
||||
label = labels[x]
|
||||
if len(label) > 0 {
|
||||
if legendCount > 0 {
|
||||
ycursor += DefaultMinimumTickVerticalSpacing
|
||||
}
|
||||
|
||||
tb := r.MeasureText(label)
|
||||
|
||||
ty := ycursor + tb.Height()
|
||||
r.Text(label, tx, ty)
|
||||
|
||||
th2 := tb.Height() >> 1
|
||||
|
||||
lx := tx + tb.Width() + lineTextGap
|
||||
ly := ty - th2
|
||||
lx2 := legendContent.Right - legendPadding.Right
|
||||
|
||||
r.SetStrokeColor(lines[x].GetStrokeColor())
|
||||
r.SetStrokeWidth(lines[x].GetStrokeWidth())
|
||||
r.SetStrokeDashArray(lines[x].GetStrokeDashArray())
|
||||
|
||||
r.MoveTo(lx, ly)
|
||||
r.LineTo(lx2, ly)
|
||||
r.Stroke()
|
||||
|
||||
ycursor += tb.Height()
|
||||
legendCount++
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user