71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
package mujica
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import (
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"log/slog"
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"math"
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"strconv"
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"time"
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"github.com/egoist/mygo/ui"
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"mujicaui/theme"
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)
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// CountUpOptions configure a CountUp.
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type CountUpOptions struct {
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// Duration of a change; zero means StateDuration.
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Duration time.Duration
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// Decimals shown; Format overrides it.
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Decimals int
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// Format writes the shown value; nil uses Decimals.
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Format func(v float64) string
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}
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type countUpState struct {
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from, to float64
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start time.Time
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}
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// CountUp counts from the last value to the new one.
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func CountUp(c *ui.Context, value float64, opts CountUpOptions) *ui.Element {
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if math.IsNaN(value) || math.IsInf(value, 0) {
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panic("mujica: CountUp value must be finite")
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}
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if opts.Duration < 0 || opts.Decimals < 0 {
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panic("mujica: CountUp Duration and Decimals must not be negative")
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}
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d := opts.Duration
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if d == 0 {
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d = theme.StateDuration
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}
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format := opts.Format
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if format == nil {
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format = func(v float64) string { return strconv.FormatFloat(v, 'f', opts.Decimals, 64) }
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}
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dur := Motion(c, d)
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now := c.Now()
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row := ui.Row(c).Shrink(0).Label(format(value))
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st := ui.Local(row, "count", func() countUpState { return countUpState{from: value, to: value} })
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at := func() float64 {
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if dur == 0 {
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return st.to
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}
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p := min(1, float64(now.Sub(st.start))/float64(dur))
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eased := float64(ui.EaseOut(float32(p)))
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return st.from*(1-eased) + st.to*eased
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}
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if value != st.to {
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from := at()
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slog.Debug("mujica: count up", "from", from, "to", value)
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st.from, st.to, st.start = from, value, now
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}
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if dur == 0 {
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st.from, st.start = st.to, now
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}
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shown := at()
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if shown != st.to {
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row.DrawOver(func(*ui.Painter, ui.Rect) { c.AnimationFrame() })
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}
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return row.Children(func() { ui.Text(c, format(shown)).FontFeatures("tnum").SingleLine() })
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}
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