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.
51 lines
1.4 KiB
Go
51 lines
1.4 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 MountainsOptions 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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// Mountains scroll three ridges: far ones slow, near ones quick.
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func Mountains(c *ui.Context, o MountainsOptions) *ui.Element {
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k := pixel.K(c)
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w, h := size("Mountains", 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() { mountains(g, k, g.Step(8), 3) })
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})
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}
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// tri rises from 0 to a, then falls, over p.
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func tri(t, p, a int) int {
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t, h := wrap(t, p), p/2
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if t < h {
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return a * t / h
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}
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return a * (p - t) / h
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}
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// mountains draws n ridges; ridge l moves every 8>>l steps.
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func mountains(g pixel.Canvas, k pixel.Kit, step, n int) {
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slots := [3]pixel.Slot{pick(k, pixel.Shade, pixel.Face), pick(k, pixel.Faint, pixel.Back), pick(k, pixel.Edge, pixel.Well)}
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snowy := k.Palette().Season == pixel.Winter
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for l := range n {
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shift := step / (8 >> l)
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for x := range g.W {
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u := x + shift
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h := g.H*(7-2*l)/16 + tri(u+rnd(l, 100), 48+16*l, g.H/5) + tri(2*u+rnd(l, 101), 37, g.H/12) + rnd(u, 102+l)%2
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g.VLine(x, g.H-h, h, slots[l])
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// Winter caps the far peaks with snow.
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if snowy && l == 0 && h > g.H*9/16 {
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g.VLine(x, g.H-h, 2, light(k))
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}
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}
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}
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}
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