3cb33d48d3
* Add ability to set custom stylesheets for SVG renderer This allow to set custom inline CSS and a optional CSP nonce. This solves the problem mentioned in #103 and is best used with it, as seen in the added examples. Without this one would have to write a custom renderer. * Add note with link to the custom_stylesheets example
58 lines
1.6 KiB
Go
58 lines
1.6 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"github.com/wcharczuk/go-chart"
|
|
"log"
|
|
"net/http"
|
|
)
|
|
|
|
// Note: Additional examples on how to add Stylesheets are in the custom_stylesheets example
|
|
|
|
func inlineSVGWithClasses(res http.ResponseWriter, req *http.Request) {
|
|
res.Write([]byte(
|
|
"<!DOCTYPE html><html><head>" +
|
|
"<link rel=\"stylesheet\" type=\"text/css\" href=\"/main.css\">" +
|
|
"</head>" +
|
|
"<body>"))
|
|
|
|
pie := chart.PieChart{
|
|
// Note that setting ClassName will cause all other inline styles to be dropped!
|
|
Background: chart.Style{ClassName: "background"},
|
|
Canvas: chart.Style{
|
|
ClassName: "canvas",
|
|
},
|
|
Width: 512,
|
|
Height: 512,
|
|
Values: []chart.Value{
|
|
{Value: 5, Label: "Blue", Style: chart.Style{ClassName: "blue"}},
|
|
{Value: 5, Label: "Green", Style: chart.Style{ClassName: "green"}},
|
|
{Value: 4, Label: "Gray", Style: chart.Style{ClassName: "gray"}},
|
|
},
|
|
}
|
|
|
|
err := pie.Render(chart.SVG, res)
|
|
if err != nil {
|
|
fmt.Printf("Error rendering pie chart: %v\n", err)
|
|
}
|
|
res.Write([]byte("</body>"))
|
|
}
|
|
|
|
func css(res http.ResponseWriter, req *http.Request) {
|
|
res.Header().Set("Content-Type", "text/css")
|
|
res.Write([]byte("svg .background { fill: white; }" +
|
|
"svg .canvas { fill: white; }" +
|
|
"svg path.blue { fill: blue; stroke: lightblue; }" +
|
|
"svg path.green { fill: green; stroke: lightgreen; }" +
|
|
"svg path.gray { fill: gray; stroke: lightgray; }" +
|
|
"svg text.blue { fill: white; }" +
|
|
"svg text.green { fill: white; }" +
|
|
"svg text.gray { fill: white; }"))
|
|
}
|
|
|
|
func main() {
|
|
http.HandleFunc("/", inlineSVGWithClasses)
|
|
http.HandleFunc("/main.css", css)
|
|
log.Fatal(http.ListenAndServe(":8080", nil))
|
|
}
|