Ilysa by Example: Sequence and Range

Use a sequence for discrete events (e.g. every beat for 4 beats), use a range for continuous events (e.g. fade alpha from 1 to 0 over 0.5 beats). We often require both to achieve an effect and Ilysa lets you nest them.

 
package main
 
import (
    "github.com/shasderias/ilysa"
    "github.com/shasderias/ilysa/beatsaber"
    "github.com/shasderias/ilysa/colorful"
    "github.com/shasderias/ilysa/context"
    "github.com/shasderias/ilysa/ease"
    "github.com/shasderias/ilysa/evt"
    "github.com/shasderias/ilysa/timer"
)

Use colorful.MustParseHex() to specify colors.

 
var Red = colorful.MustParseHex("#FF0000")
 
func main() {
    m, _ := beatsaber.NewMockMap(beatsaber.EnvironmentOrigins, 120, "[]")
    p := ilysa.New(m)

Create events at beats 0 and 2 …

 
    p.Sequence(timer.Seq([]float64{0, 2}, 0), func(ctx context.Context) {

… for each beat in the sequence create 6 events from beats 0 to 0.5.

 
        ctx.Range(timer.Rng(0, 0.5, 6, ease.Linear), func(ctx context.Context) {

ctx.NewRGBLighting() specifies Chroma lighting events.

 
            ctx.NewRGBLighting(
                evt.WithLight(evt.LeftRotatingLasers),
                evt.WithLightValue(evt.LightRedOn),
                evt.WithColor(Red),
                evt.WithAlpha(ctx.T()),
            )
        })
    })
 
    p.Dump()
}

The above snippet fades the left lasers in from alpha 0 to alpha 1 over 0.5 beats twice. Once at beat 0 and once more at beat 2.

 
$ go run sequence-and-range.go
[
    {"_customData":{"_color":[1,0,0,0]},"_time":0,"_type":2,"_value":5},
    {"_customData":{"_color":[1,0,0,0.2]},"_time":0.1,"_type":2,"_value":5},
    {"_customData":{"_color":[1,0,0,0.4]},"_time":0.2,"_type":2,"_value":5},
    {"_customData":{"_color":[1,0,0,0.6]},"_time":0.3,"_type":2,"_value":5},
    {"_customData":{"_color":[1,0,0,0.8]},"_time":0.4,"_type":2,"_value":5},
    {"_customData":{"_color":[1,0,0,1]},"_time":0.5,"_type":2,"_value":5},
    
    {"_customData":{"_color":[1,0,0,0]},"_time":2,"_type":2,"_value":5},
    {"_customData":{"_color":[1,0,0,0.2]},"_time":2.1,"_type":2,"_value":5},
    {"_customData":{"_color":[1,0,0,0.4]},"_time":2.2,"_type":2,"_value":5},
    {"_customData":{"_color":[1,0,0,0.6]},"_time":2.3,"_type":2,"_value":5},
    {"_customData":{"_color":[1,0,0,0.8]},"_time":2.4,"_type":2,"_value":5},
    {"_customData":{"_color":[1,0,0,1]},"_time":2.5,"_type":2,"_value":5}
]

Next example: Light.

by shasderias | source | license