62 lines
1.1 KiB
Go
62 lines
1.1 KiB
Go
//go:build js && wasm
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// +build js,wasm
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package src
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"image/color"
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"io"
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"syscall/js"
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"gonum.org/v1/plot/plotter"
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)
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func WriterToBase64String(writer io.WriterTo) string {
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var buf bytes.Buffer
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writer.WriteTo(&buf)
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return base64.StdEncoding.EncodeToString(buf.Bytes())
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}
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func HexToRGBA(hex string) color.RGBA {
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var c color.RGBA
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switch len(hex) {
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case 4:
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fmt.Sscanf(hex, "#%1x%1x%1x%1x", &c.R, &c.G, &c.B, &c.A)
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c.R *= 17
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c.G *= 17
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c.B *= 17
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c.A = 255
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case 7:
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fmt.Sscanf(hex, "#%02x%02x%02x", &c.R, &c.G, &c.B)
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c.A = 255
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case 9:
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fmt.Sscanf(hex, "#%02x%02x%02x%02x", &c.R, &c.G, &c.B, &c.A)
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default:
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fmt.Println("Invalid hex color:", hex)
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}
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return c
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}
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func XYFromJSObject(object js.Value) plotter.XYs {
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var (
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x = object.Get("x")
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y = object.Get("y")
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)
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if x.IsUndefined() || y.IsUndefined() {
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return nil
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}
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return XYFromJSValues(x, y)
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}
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func XYFromJSValues(x, y js.Value) plotter.XYs {
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xy := make(plotter.XYs, x.Length())
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for i := range xy {
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xy[i].X = x.Index(i).Float()
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xy[i].Y = y.Index(i).Float()
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}
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return xy
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}
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