/**
 *  This program animates a ball bouncing in a rectangular box.
 */
import processing.core.PApplet
import ddf.minim.*

fun main(args: Array<String>) {
    PApplet.main("BallSketch")
}

class BallSketch : PApplet() {
    val resources = "src/resources"
    val ballImage by lazy { loadImage("$resources/earth.gif") }
    lateinit var laserPlayer: AudioPlayer
    lateinit var popPlayer: AudioPlayer

    val ballRadius = 10F
    // The following two numbers are gotten by trial and error.
    val minV = 1.0F // minimum velocity
    val maxV = 6.8F // maximum velocity

    var px = 0F // x-coordinate of position
    var py = 0F // y-coordinate of position
    var vx = 0F // x-coordinate of velocity
    var vy = 0F // y-coordinate of velocity
    var minX = 0F
    var maxX = 0F
    var minY = 0F
    var maxY = 0F

    override fun settings() {
        size(640, 480)
        minX = ballRadius
        maxX = width - ballRadius
        minY = ballRadius
        maxY = height - ballRadius
    }

    override fun setup() {
        val minim = Minim(this)
        laserPlayer = minim.loadFile("$resources/laser.wav")
        popPlayer = minim.loadFile("$resources/pop.wav")

        // picks a random starting position for the ball
        px = random(minX, maxX)
        py = random(minY, maxY)

        // picks a random starting velocity for the ball
        vx = random(minV, maxV)
        vy = random(minV, maxV)
    }

    override fun draw() {
        // finds the new position of the ball
        if ((px + ballRadius) !in minX..maxX) {
            vx = -vx
            laserPlayer.rewind()
            laserPlayer.play()
        }
        if ((py + ballRadius) !in minY..maxY) {
            vy = -vy
            popPlayer.rewind()
            popPlayer.play()
        }
        px += vx
        py += vy

        // draws the background, and then the ball
        background(200)
        image(ballImage, px, py)
    }
}