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.
96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
// Package fx draws weather, scenes and transitions in stepped frames.
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package fx
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import (
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"fmt"
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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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// box sizes an effect; a label makes it an image.
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func box(c *ui.Context, k pixel.Kit, label string, w, h int) *ui.Element {
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e := ui.Box(c).Size(k.D(w), k.D(h))
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if label != "" {
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return e.Label(label).Role(ui.RoleImage)
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}
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return e.Role(ui.RoleNone)
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}
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// size is w×h; zeros take dw×dh.
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func size(name string, w, h, dw, dh int) (int, int) {
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return pixel.Or(name+" Width", w, dw), pixel.Or(name+" Height", h, dh)
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}
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// scale is s, or def for zero; above 4 panics.
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func scale(name string, s, def int) int {
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s = pixel.Or(name+" Scale", s, def)
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if s > 4 {
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panic(fmt.Sprintf("fx: %s Scale %d outside 1–4", name, s))
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}
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return s
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}
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// rnd is a fixed pseudo-random number for i and salt.
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func rnd(i, salt int) int {
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x := uint64(i)*0x9E3779B97F4A7C15 + uint64(salt)*0xD1B54A32D192ED03
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x = (x ^ x>>30) * 0xBF58476D1CE4E5B9
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x = (x ^ x>>27) * 0x94D049BB133111EB
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return int((x ^ x>>31) >> 1)
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}
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// wrap is v modulo n, never negative.
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func wrap(v, n int) int { return (v%n + n) % n }
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// sway swings 0 to a, back through -a, over p.
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func sway(t, p, a int) int {
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t = wrap(t, p)
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q := p / 4
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switch {
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case t < q:
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return a * t / q
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case t < 3*q:
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return a - 2*a*(t-q)/(2*q)
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default:
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return -a + a*(t-3*q)/q
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}
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}
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// pick is day under day palettes, night under night ones.
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func pick(k pixel.Kit, day, night pixel.Slot) pixel.Slot {
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if k.Palette().Night {
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return night
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}
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return day
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}
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// light is the palette's brightest slot.
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func light(k pixel.Kit) pixel.Slot { return pick(k, pixel.Lit, pixel.Ink) }
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// dark is the palette's darkest slot.
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func dark(k pixel.Kit) pixel.Slot { return pick(k, pixel.Ink, pixel.Well) }
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// slotOr is s, or def for the zero slot.
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func slotOr(s, def pixel.Slot) pixel.Slot {
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if s == pixel.Ink {
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return def
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}
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return s
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}
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// checkHour panics outside 0–23.
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func checkHour(name string, hour int) {
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if hour < 0 || hour > 23 {
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panic(fmt.Sprintf("fx: %s hour %d outside 0–23", name, hour))
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}
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}
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// cover draws over e's content, clipped to e.
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func cover(k pixel.Kit, e *ui.Element, draw func(g pixel.Canvas), content func()) *ui.Element {
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return e.DrawOver(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() { draw(g) })
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}).Children(content)
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}
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