heart.spde

size(500, 425, P3D)
frameRate(30)
background(0)
noStroke()

val heart = {
    val l = createGraphics(50,50,P3D)
    l.beginDraw
        l.noStroke
        l.fill(255,0,0)
        l.beginShape
            l.vertex(25, 15)
            l.bezierVertex(25, -5, 75, 5, 25, 40)
        l.endShape
        l.beginShape
            l.vertex(25, 15) 
            l.bezierVertex(25, -5, -25, 5, 25, 40)
        l.endShape
    l.endDraw
    l.loadPixels
    l
}

val sceneMask = None :: Some(loadImage("meenuh.png")) :: None :: 
    Some(loadImage("x_x.png")) :: Nil

val red = color(255,0,0)
val black = color(0,0,0)
val sceneLength = 5 * frameRate.toInt // display each scene 5 seconds

def drawBlock(x: Int, y: Int, scene: Int, frame: Int, alpha: Float) {
    sceneMask(scene) match {
        case Some(mask) => {
            if ((heart.pixels(y*heart.width+x) == red) &&
                    mask.pixels(y*mask.width+x) != black) {
                fill(random(215,255),0,0)
            } else {
                fill(0,0,0,alpha)
            } 
        }
        case None => {
            if (heart.pixels(y*heart.width+x)==red) {
                fill(random(215,255),0,0)
            } else {
                fill(0,0,0)
            }
        }
    }
   rect(x*10,y*10,8,8)
}

def draw() {
    // find scene number
    val scene = (frameCount / sceneLength) % sceneMask.length
    // find frame number in scene loop
    val frame = (frameCount % (sceneLength * sceneMask.length))
    // scale alpha based on time to end of scene
    val alpha = ((frame % sceneLength) / sceneLength.toFloat) * 255

    for (x <- 0 until 50) { 
        for (y <- 0 until 50) {
            drawBlock(x,y,scene,frame,alpha)
        }
    }
}

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