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Smoke.scala
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Smoke.scala
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/*
* Copyright 2015 Creative Scala
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package doodle
package image
package examples
import doodle.core._
import doodle.image.Image
import doodle.random._
import doodle.syntax.all._
object Smoke {
val emitter =
Random.normal(0.0, 5.0) flatMap { x =>
Random.normal(0.0, 5.0) map { y =>
Point(x, y)
}
}
val drift = Vec(20, 0)
def perturb(point: Point): Random[Point] =
Random.normal(0.0, 5.0) flatMap { x =>
Random.normal(0.0, 5.0) map { y =>
point + Vec(x, y) + drift
}
}
def cool(color: Color): Random[Color] =
Random.double map (_ * 0.2) map (_.normalized) map { d =>
color.desaturateBy(d).fadeOutBy(d).spin((d.get * -100).degrees)
}
def widen(radius: Double): Random[Double] =
Random.double map { r =>
(r * 2) + radius
}
def particle(point: Point, color: Color, radius: Double): Image =
Image.circle(radius).fillColor(color).noStroke.at(point.toVec)
def step(
point: Point,
color: Color,
radius: Double
): Random[(Point, Color, Double)] =
perturb(point) flatMap { pt =>
widen(radius) flatMap { r =>
cool(color) map { c =>
(pt, c, r)
}
}
}
def randomWalk(steps: Int): Random[Image] = {
def loop(
count: Int,
point: Point,
color: Color,
radius: Double
): Random[Image] =
count match {
case 0 => Random.always(particle(point, color, radius))
case n =>
val img = particle(point, color, radius)
step(point, color, radius) flatMap { updated =>
val (pt, c, r) = updated
loop(n - 1, pt, c, r).map(accum => img on accum)
}
}
emitter.flatMap(pt =>
loop(steps, pt, Color.yellow.alpha(0.7.normalized), 3)
)
}
val image =
(1 to 20).foldLeft(Random.always(Image.empty)) { (accum, _) =>
accum.flatMap(a => randomWalk(20).map(i => i on a))
}
}