Ilysa by Example: FX - Alpha

The fx package has functions for working with alpha fades.

 
package main
 
import (
    "github.com/shasderias/ilysa"
    "github.com/shasderias/ilysa/beatsaber"
    "github.com/shasderias/ilysa/colorful"
    "github.com/shasderias/ilysa/colorful/gradient"
    "github.com/shasderias/ilysa/context"
    "github.com/shasderias/ilysa/ease"
    "github.com/shasderias/ilysa/evt"
    "github.com/shasderias/ilysa/fx"
    "github.com/shasderias/ilysa/light"
    "github.com/shasderias/ilysa/timer"
    "github.com/shasderias/ilysa/transform"
)
 
var (
    Red     = colorful.MustParseHex("#FF0000")
    Green   = colorful.MustParseHex("#00FF00")
    Blue    = colorful.MustParseHex("#0000FF")
    RGBGrad = gradient.New(Red, Blue, Green)
)
 
func main() {
    m, _ := beatsaber.NewMockMap(beatsaber.EnvironmentOrigins, 120, "[]")
    p := ilysa.New(m)
 
    l := transform.Light(light.NewBasic(p, evt.BackLasers),
        transform.DivideSingle(),
    )

Save the event(s) generated by fx.ColorSweep() to e.

 
    p.Range(timer.Rng(2, 3, 10, ease.Linear), func(ctx context.Context) {
        ctx.Light(l, func(ctx context.LightContext) {
 
            e := fx.ColorSweep(ctx, 0.2, RGBGrad)

fx.AlphaFade() fades e from alpha 1 (at beat 2) to alpha 0 at beat 3.

 
            fx.AlphaFade(ctx, e, 1, 0, ease.Linear)

fx.AlphaFadeEx() works the similarly to fx.AlphaFade(), but offers more control. In this example, we fade alpha 0 to alpha 2, starting at t = 0 (beat 2) and ending at t = 0.5 (beat 2.5).

 
            fx.AlphaFadeEx(ctx, e, 0, 0.5, 0, 2, ease.Linear)
        })
    })
}

Next example: FX - Ripple.

by shasderias | source | license