Just a simple star field.
Starfield
import io.data2viz.color.*
import io.data2viz.geom.*
import io.data2viz.math.*
import io.data2viz.viz.*
import io.data2viz.random.*
import kotlin.math.sqrt
private val vizWidth = 600.0
private val vizHeight = 600.0
private var center = Point(vizWidth / 2, vizHeight / 2)
private val randomAngle = RandomDistribution.uniform(.02, 2 * PI)
private val randomDistance = RandomDistribution.uniform(1.1, 4.0)
private val randomDepth = RandomDistribution.uniform(0.4, 1.0)
private val randomRadius = RandomDistribution.exponential()
private var frame = .0
data class Star(val visual: CircleNode, var radius: Double, var angle: Angle, var distance: Double, val depth: Double)
private var totalStars = 2000
private lateinit var galaxy: GroupNode
private lateinit var stars: List<Star>
fun main() {
viz {
size = size(vizWidth, vizHeight)
rect {
width = vizWidth
height = vizHeight
fill = Colors.Web.black
}
galaxy = group {
stars = (0 until totalStars).map {
val angle = randomAngle().rad
val starDis = randomDistance() * randomDistance() * randomDistance()
val starDepth = randomDepth()
val starPos = Point(starDis*angle.cos, starDis*angle.sin)
var starRadius = 0.1 + (randomRadius() * sqrt(starDepth) / 1.3)
Star(
circle {
x = starPos.x
y = starPos.y
radius = starRadius
fill = Colors.Web.white.withAlpha((starDepth*120).pct)
},
starRadius,
angle,
starDis,
starDepth
)
}
}
animation {
frame += 0.05
galaxy.apply {
transform {
translate(center.x + (15 * frame.rad.sin), center.y + (10 * (frame / 1.3).rad.cos))
}
}
stars.forEach { star ->
star.distance *= 1.0 + (sqrt(star.distance) * star.depth / 200.0)
star.angle += (star.depth / 1.5).deg
val starX = star.distance * star.angle.cos
val starY = star.distance * star.angle.sin
val alpha = star.depth * star.distance
star.visual.x = starX
star.visual.y = starY
if (alpha <= 102) star.visual.fill = Colors.Web.white.withAlpha(alpha.pct)
star.visual.radius = star.radius * (sqrt(star.distance) / 10.0)
if (starX < -center.x || starX > center.x || starY < -center.y || starY > center.y) {
star.distance = randomDistance() * randomDistance()
star.radius = 0.1 + (randomRadius() * sqrt(star.depth) / 1.3)
star.angle = randomAngle().rad
}
}
}
}.bindRendererOnNewCanvas()
}
Sketch created by
pierre
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