doodle.image.examples.Tree.scala Maven / Gradle / Ivy

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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.*
import doodle.syntax.all.*

object Tree {
  def leaf(angle: Angle, length: Double): Image =
    Image
      .path(
        OpenPath.empty.moveTo(Point.zero).lineTo(Point.polar(length, angle))
      )
      .strokeColor(Color.hsl(angle, .5, .5))

  def branch(depth: Int, angle: Angle, length: Double): Image = {
    if depth == 0 then {
      leaf(angle, length)
    } else {
      val l = branch(depth - 1, angle + 20.degrees, length * 0.8)
      val r = branch(depth - 1, angle - 20.degrees, length * 0.8)
      val b = leaf(angle, length)
      b on ((l on r) at Vec.polar(length, angle))
    }
  }

  def image = branch(10, 90.degrees, 50)
}