ZacharyZhang-NY
8be66c09f2
Palette cycling, sky, sun and moon, clouds, starfield, rain, snow, petals, leaves, fireflies, waterfall, ocean, campfire, lava, aurora, lightning, mountains and a season scene; scanlines, vignette, screen shake, flash, dither fades, iris wipes, dissolves, mosaics, glitches, sparkles, explosions and confetti. Home opens on a live scene in the palette's season and a strip of all eight palettes. pixel adds Canvas.Cycled, Sprite.At, SpriteOf, Kit.Toward and Kit.Shot, which spends a cue under Reduce Motion so it never replays; display exports Reduce. Gallery grids and the sidebar are one Tab stop each.
42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
package fx
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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 StarfieldOptions struct {
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// Width and Height are dots; zeros mean 160 by 96.
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Width, Height int
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Label string
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}
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// Starfield scrolls three layers of stars, near ones fastest.
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func Starfield(c *ui.Context, o StarfieldOptions) *ui.Element {
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k := pixel.K(c)
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w, h := size("Starfield", o.Width, o.Height, 160, 96)
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return box(c, k, o.Label, w, h).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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g.Clip(0, 0, g.W, g.H, func() { starfield(g, k, g.Step(12)) })
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})
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}
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// starfield moves layer l one dot every 4>>l steps.
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func starfield(g pixel.Canvas, k pixel.Kit, step int) {
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g.Rect(0, 0, g.W, g.H, dark(k))
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for l, s := range []pixel.Slot{pixel.Faint, pixel.AccentLit, light(k)} {
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shift := step / (4 >> l)
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for i := range g.W * g.H / (120 + 80*l) {
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x, y := wrap(rnd(i, 20+l)-shift, g.W), rnd(i, 23+l)%g.H
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switch t := wrap(step+rnd(i, 26), 12); {
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case l == 2 && t < 2:
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g.Rect(x-1, y, 3, 1, s)
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g.Rect(x, y-1, 1, 3, s)
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case t != 6:
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g.Dot(x, y, s)
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}
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}
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}
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}
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