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https://www.openprocessing.org/sketch/149337 を Scala に移植してみたもの。
import processing.core.PConstants._
import processing.core.{PApplet, PFont, PGraphics, PVector}
import scala.collection.mutable.ArrayBuffer
// Original is : https://www.openprocessing.org/sketch/149337 by Jerome Herr
//
class App extends PApplet {
lazy val letterGraphic: PGraphics = {
createGraphics(width, height)
}
lazy val font: PFont = {
createFont("ArialHebrew", FONT_SIZE)
}
val NUM = 2000
val ballCollection = new ArrayBuffer[Ball](NUM)
val FONT_SIZE = 400
var letter = "A"
var theta: Float = _
override def settings(): Unit = {
size(400, 400, JAVA2D)
}
override def setup(): Unit = {
updateLetter()
createBallAndLines()
}
private def updateLetter(): Unit ={
ballCollection.clear()
letterGraphic.beginDraw()
letterGraphic.noStroke()
letterGraphic.background(255)
letterGraphic.fill(0)
letterGraphic.textFont(font, FONT_SIZE)
letterGraphic.textAlign(CENTER)
letterGraphic.text(letter, 200f, 350f)
letterGraphic.endDraw()
letterGraphic.loadPixels()
}
private def createBallAndLines(): Unit = {
for (i <- 0 to NUM) {
val x = random(width).toInt
val y = random(height).toInt
val c = letterGraphic.pixels(x + y * width)
if (brightness(c) < 255) {
val org = new PVector(x, y)
val radius = random(5, 10)
val loc = new PVector(org.x + radius, org.y)
val offSet = random(TWO_PI)
val dir = if (random(1) > .5) {
-1
} else {
1
}
val myBall = new Ball(org, loc, radius, dir, offSet)
ballCollection.append(myBall)
}
}
}
override def keyPressed(): Unit = {
if (key != CODED) {
letter = PApplet.str(key)
updateLetter()
createBallAndLines()
}
}
override def draw(): Unit = {
background(20)
textAlign(LEFT, TOP)
text("%2.3f fps".format(frameRate), 0, 0)
text("current : %s".format(letter), 0 , 15)
ballCollection.foreach({ ball =>
ball.draw()
})
theta += .0523f
}
class Ball(val org: PVector, val loc: PVector, val radius: Float, val dir: Int, val offset: Float) {
val SIZE = 2
val MAX_DIST = 20
val OPACITY = 35
val connection = new Array[Boolean](NUM)
var countC = 1
def draw(): Unit = {
display()
move()
lineBetween()
}
private def move(): Unit = {
loc.x = org.x + PApplet.sin(theta * dir + offset) * radius
loc.y = org.y + PApplet.cos(theta * dir + offset) * radius
}
private def display(): Unit = {
noStroke()
fill(255, 100)
ellipse(loc.x, loc.y, SIZE, SIZE)
}
private def lineBetween(): Unit = {
var other: Ball = null
for (i <- 0 to ballCollection.size - 1) {
other = ballCollection(i)
val distance = loc.dist(other.loc)
if (distance > 0 && distance < MAX_DIST) {
stroke(255, OPACITY)
line(loc.x, loc.y, other.loc.x, other.loc.y)
}
}
}
}
}
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