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Polygons.scala
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Polygons.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 examples
import cats.instances.list._
import doodle.algebra.Picture
import doodle.core._
import doodle.language.Basic
import doodle.syntax.all._
object Polygons {
def picture: Picture[Basic, Unit] = {
def polygon(sides: Int, radius: Double): Picture[Basic, Unit] = {
val centerAngle = 360.degrees / sides.toDouble
val shape = (0 until sides).foldLeft(ClosedPath.empty) { (path, index) =>
val point = Point.polar(radius, centerAngle * index.toDouble)
if (index == 0) path.moveTo(point) else path.lineTo(point)
}
shape
.path[Basic]
.strokeWidth(3)
.strokeColor(Color.hsl(centerAngle, 1, .5))
}
((3 to 10) map (polygon(_, 200))).toList.allOn
}
}