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.
65 lines
1.6 KiB
Go
65 lines
1.6 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 GlitchOptions struct {
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// Cue glitches the picture each time it changes.
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Cue int
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// Slot inks the sprite's # dots.
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Slot pixel.Slot
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Scale int
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Label string
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}
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const glitchSteps = 6
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// Glitch shifts row bands and swaps two slots, briefly.
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func Glitch(c *ui.Context, sp *pixel.Sprite, o GlitchOptions) *ui.Element {
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k := pixel.K(c)
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sc := scale("Glitch", o.Scale, 1)
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// Three dots either side hold the rows shifted out.
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e := box(c, k, o.Label, (sp.W+6)*sc, sp.H*sc)
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step := k.Shot(c, e, o.Cue, 15, glitchSteps)
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used := slotsOf(sp, o.Slot)
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return e.Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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if step == glitchSteps {
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g.Sprite(3*sc, 0, sp, 0, o.Slot, sc)
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return
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}
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seed := o.Cue*glitchSteps + step
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if len(used) > 1 {
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a := rnd(seed, 160) % len(used)
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b := (a + 1 + rnd(seed, 161)%(len(used)-1)) % len(used)
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g = g.Cycled([]pixel.Slot{used[a], used[b]}, 1)
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}
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for y := 0; y < sp.H; {
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h, dx := 1+rnd(seed+y, 162)%4, 0
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if rnd(seed+y, 163)%3 == 0 {
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dx = rnd(seed+y, 164)%7 - 3
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}
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g.Clip(0, y*sc, g.W, h*sc, func() { g.Sprite((3+dx)*sc, 0, sp, 0, o.Slot, sc) })
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y += h
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}
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})
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}
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// slotsOf lists the slots sp's first frame uses.
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func slotsOf(sp *pixel.Sprite, ink pixel.Slot) []pixel.Slot {
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var seen [pixel.Slots]bool
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var out []pixel.Slot
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for y := range sp.H {
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for x := range sp.W {
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if s, ok := sp.At(0, x, y, ink); ok && !seen[s] {
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seen[s] = true
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out = append(out, s)
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}
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}
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}
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return out
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}
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