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.
43 lines
1007 B
Go
43 lines
1007 B
Go
package fx
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import (
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"math"
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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 IrisWipeOptions struct {
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// Slot fills outside the iris; zero means the darkest slot.
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Slot pixel.Slot
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}
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// IrisWipe closes a circle on content's middle, or opens it.
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func IrisWipe(c *ui.Context, closed bool, o IrisWipeOptions, content func()) *ui.Element {
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k := pixel.K(c)
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s := slotOr(o.Slot, dark(k))
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e := ui.Column(c)
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step := k.Toward(c, e, closed, 12, 8)
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return cover(k, e, func(g pixel.Canvas) { iris(g, s, step) }, content)
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}
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// iris fills outside a circle, gone by step 8.
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func iris(g pixel.Canvas, s pixel.Slot, step int) {
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if step == 0 {
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return
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}
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cx, cy := g.W/2, g.H/2
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r := int(math.Ceil(math.Hypot(float64(g.W)/2, float64(g.H)/2))) * (8 - step) / 8
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for y := range g.H {
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dy := y - cy
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if dy*dy >= r*r {
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g.HLine(0, y, g.W, s)
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continue
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}
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dx := int(math.Sqrt(float64(r*r - dy*dy)))
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g.HLine(0, y, cx-dx, s)
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g.HLine(cx+dx, y, g.W-cx-dx, s)
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}
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}
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