Render a Processing (http://processing.org) scene to an image

processing.scala

//Invoke with: scala -cp /opt/processing-1.5.1/lib/core.jar processing.scala

import processing.core._
import java.io._
import java.awt.image._
import javax.imageio._

class Image extends PApplet {
  private[this] val width = 200
  private[this] val height = 200

  //Don't override those or you get stuck in the Animation thread endless loop when calling init
  //override def setup {
    //size(width, height)
    //background(0)
  //}

  //override def draw {
    //stroke(255)
    //line(10, 10, 50, 50)
  //}

  def renderToImage = {
    init

    size(256, 256)
    background(0)
    stroke(255)
    line(10, 10, 50, 50)
    line(50, 10, 10, 50)

    noLoop
    loadPixels

    val img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB)
    img.setRGB(0, 0, width, height, pixels, 0, 256)
    draw

    img
  }

}

object Program {
  def main(args: Array[String]) {
    val image = new Image

    val os: OutputStream = new FileOutputStream("out.png")
    ImageIO.write(image.renderToImage, "PNG", os);
    os.close
  }
}

Program.main(Array())