50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
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package main
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import (
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"net/http"
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chart "github.com/wcharczuk/go-chart"
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"github.com/wcharczuk/go-chart/drawing"
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)
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func conditionalColor(condition bool, trueColor drawing.Color, falseColor drawing.Color) drawing.Color {
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if condition {
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return trueColor
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}
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return falseColor
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}
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func drawChart(res http.ResponseWriter, req *http.Request) {
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r, _ := chart.PNG(1024, 1024)
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b0 := chart.Box{Left: 100, Top: 100, Right: 400, Bottom: 200}
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b1 := chart.Box{Left: 500, Top: 100, Right: 900, Bottom: 200}
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b0r := b0.Corners().Rotate(45).Shift(0, 200)
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chart.Draw.Box(r, b0, chart.Style{
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StrokeColor: drawing.ColorRed,
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StrokeWidth: 2,
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FillColor: conditionalColor(b0.Corners().Overlaps(b1.Corners()), drawing.ColorRed, drawing.ColorTransparent),
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})
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chart.Draw.Box(r, b1, chart.Style{
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StrokeColor: drawing.ColorBlue,
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StrokeWidth: 2,
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FillColor: conditionalColor(b1.Corners().Overlaps(b0.Corners()), drawing.ColorRed, drawing.ColorTransparent),
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})
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chart.Draw.Box2d(r, b0r, chart.Style{
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StrokeColor: drawing.ColorGreen,
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StrokeWidth: 2,
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FillColor: conditionalColor(b0r.Overlaps(b0.Corners()), drawing.ColorRed, drawing.ColorTransparent),
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})
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res.Header().Set("Content-Type", "image/png")
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r.Save(res)
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}
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func main() {
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http.HandleFunc("/", drawChart)
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http.ListenAndServe(":8080", nil)
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}
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