45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
package feedback
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import (
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type SpinnerOptions struct {
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// Scale is 1–4; zero means 1.
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Scale int
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}
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// ring is where the spinner's eight beads sit, by hand.
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var ring = [8][2]int{{5, 1}, {8, 2}, {9, 5}, {8, 8}, {5, 9}, {2, 8}, {1, 5}, {2, 2}}
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// Spinner turns through eight frames, even under Reduce Motion.
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func Spinner(c *ui.Context, text string, o SpinnerOptions) *ui.Element {
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k := pixel.K(c)
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s := pixel.Or("Spinner Scale", o.Scale, 1)
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if s > 4 {
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panic("feedback: Spinner Scale past 4")
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}
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return ui.Box(c).Role(ui.RoleProgress).Label(text).Size(k.D(12*s), k.D(12*s)).Draw(func(p *ui.Painter, r ui.Rect) {
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beads(k.Canvas(p, r), 0, 0, s)
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})
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}
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// beads draws the spinner ring at x, y, scaled s.
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func beads(g pixel.Canvas, x, y, s int) {
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head := g.Busy(10) % 8
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for i, at := range ring {
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ink := pixel.Shade
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switch (head - i + 8) % 8 {
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case 0:
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ink = pixel.Accent
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case 1:
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ink = pixel.AccentLit
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case 2:
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ink = pixel.Faint
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}
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g.Rect(x+at[0]*s, y+at[1]*s, 2*s, 2*s, ink)
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}
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}
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