52 lines
1.4 KiB
Go
52 lines
1.4 KiB
Go
package chart
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import (
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"bytes"
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"image/png"
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"log/slog"
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"math"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/MujicaUI/core"
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)
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// ChartExportOptions configure a ChartExport.
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type ChartExportOptions struct {
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// Width and Height are the image size in DIPs; required.
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Width, Height int
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// Scale is device pixels per DIP; 0 means 2.
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Scale float32
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}
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// ChartExport returns a PNG rendered in the current theme.
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func ChartExport(c *ui.Context, chart func(c *ui.Context), opts ChartExportOptions) ([]byte, error) {
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if chart == nil || opts.Width <= 0 || opts.Height <= 0 || opts.Scale < 0 || math.IsNaN(float64(opts.Scale)) || math.IsInf(float64(opts.Scale), 0) {
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panic("mujica: ChartExport needs a chart, a positive size and Scale ≥ 0")
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}
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scale := opts.Scale
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if scale == 0 {
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scale = 2
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}
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settings, tokens := core.CurrentSettings(c), core.Tokens(c)
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ready := false
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tester := ui.NewTester(func(c *ui.Context) {
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if !ready {
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return
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}
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core.Use(c, settings)
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ui.Column(c).Fill().Background(tokens.Surface).Padding(core.Density(c).Unit() * 4).Children(func() { chart(c) })
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}, opts.Width, opts.Height)
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tester.SetScale(scale)
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tester.SetPreferences(c.Preferences())
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ready = true
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tester.Frame()
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img := tester.Image()
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var buf bytes.Buffer
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if err := png.Encode(&buf, img); err != nil {
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return nil, err
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}
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slog.Debug("mujica: chart_export png", "bytes", buf.Len(), "width", opts.Width, "height", opts.Height)
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return buf.Bytes(), nil
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}
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