smile visualization line charts / published by https://github.com/dacr/code-examples-manager #2ac85e0c-419d-4165-8491-9e5fc5367eba/98fa02fa8957e9f13b642571561ed187f768c667

visualization-swing-linechart.sc

// summary : smile visualization line charts
// keywords : smile, chart, visualization
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : 2ac85e0c-419d-4165-8491-9e5fc5367eba
// created-on : 2021-03-05T09:23:01Z
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala  "3.2.2"
//> using dep "com.github.haifengl:smile-scala_2.13:3.0.1"
// ---------------------

import smile.plot.swing.*
import smile.plot.show
import smile.plot.Render.*

import java.awt.Color
import scala.math.*

// examples coming from http://haifengl.github.io/visualization.html

implicit val renderer:Canvas=>Unit = JWindow.apply

// --------------------------------------------------------------------

def interval(from:Double, to:Double, count:Int):LazyList[Double] = {
  val step = (to-from)/count
  LazyList.iterate(from)(step.+).takeWhile(_ <= to)
}

// --------------------------------------------------------------------
{
  val heart = -314 to 314 map { i =>
    val t = i / 100.0
    val x = 16 * pow(sin(t), 3)
    val y = 13 * cos(t) - 5 * cos(2*t) - 2 * cos(3*t) - cos(4*t)
    Array(x, y)
  }
  show(line(heart.toArray, color = Color.RED))
}

// --------------------------------------------------------------------
{
  val gauss = interval(-5, 5, 1000).map { x =>
    val y = exp(-pow(x, 2))
    Array(x, y)
  }
  show(line(gauss.toArray, color = Color.BLUE))
}

// --------------------------------------------------------------------

println("enter to exit"); scala.io.StdIn.readLine()