f97f94425f
* Add ability to set CSS classes instead of inline styles This allows to set a `ClassName` field in `Style` structs. Setting this field to anything but "" will cause all other styles to be ignored. The element will then have a `class=` tag instead with the corresponding name. Possible reasons to use this: * Including multiple SVGs on the same webside, using the same styles * Desire to use strict CSP headers * Add warning that setting `ClassName` will drop all other inline styles
56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
package main
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import (
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"fmt"
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"github.com/wcharczuk/go-chart"
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"log"
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"net/http"
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)
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func inlineSVGWithClasses(res http.ResponseWriter, req *http.Request) {
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res.Write([]byte(
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"<!DOCTYPE html><html><head>" +
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"<link rel=\"stylesheet\" type=\"text/css\" href=\"/main.css\">" +
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"</head>" +
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"<body>"))
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pie := chart.PieChart{
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// Note that setting ClassName will cause all other inline styles to be dropped!
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Background: chart.Style{ClassName: "background"},
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Canvas: chart.Style{
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ClassName: "canvas",
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},
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Width: 512,
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Height: 512,
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Values: []chart.Value{
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{Value: 5, Label: "Blue", Style: chart.Style{ClassName: "blue"}},
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{Value: 5, Label: "Green", Style: chart.Style{ClassName: "green"}},
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{Value: 4, Label: "Gray", Style: chart.Style{ClassName: "gray"}},
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},
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}
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err := pie.Render(chart.SVG, res)
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if err != nil {
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fmt.Printf("Error rendering pie chart: %v\n", err)
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}
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res.Write([]byte("</body>"))
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}
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func css(res http.ResponseWriter, req *http.Request) {
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res.Header().Set("Content-Type", "text/css")
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res.Write([]byte("svg .background { fill: white; }" +
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"svg .canvas { fill: white; }" +
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"svg path.blue { fill: blue; stroke: lightblue; }" +
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"svg path.green { fill: green; stroke: lightgreen; }" +
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"svg path.gray { fill: gray; stroke: lightgray; }" +
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"svg text.blue { fill: white; }" +
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"svg text.green { fill: white; }" +
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"svg text.gray { fill: white; }"))
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}
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func main() {
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http.HandleFunc("/", inlineSVGWithClasses)
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http.HandleFunc("/main.css", css)
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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