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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 then 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
  }
}