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package net.iximeow.raytrace
import Objects._
import java.awt.image.BufferedImage
import javax.imageio._
import java.io.File
case class Scene(walls: Seq[Surface]) {
val buffer = new BufferedImage(800, 600, BufferedImage.TYPE_INT_RGB)
def render(scale: Double = 1, xoff: Int = 0, yoff: Int = 0, color: Int = 0x808000, normals: Boolean = false): Unit = {
for (wall <- walls) {
wall.renderTo(buffer, scale, 400, 300, color = color)
}
for (wall <- walls) {
wall.normal(0.5).toSegment.renderTo(buffer, scale, 400, 300, color = 0xc00000)
}
}
def save(path: String = "render.png"): Unit = {
ImageIO.write(buffer, "png", new File(path))
}
def cast(r: Ray, steps: Int): Seq[Segment] = {
(0 until steps).foldLeft(Seq.empty[Segment] -> r) { case (p: (Seq[Segment], Ray), i: Int) => {
val (prevRay, nextRay) = castSingle(p._2)
((p._1 :+ prevRay.toSegment) -> nextRay): (Seq[Segment], Ray)
}}._1
}
def castSingle(r: Ray): (Ray, Ray) = {
val asSeg = r.toSegment
val intersections: Seq[(Surface, Point)] = walls.flatMap(w => {
w.intersectChecked(asSeg)
.map(x => (w, x))
})
.filter { case (w: Surface, x: Point) => asSeg.tFor(x).map(_ > 0.0000001).getOrElse(false) }
/*
def isBehind(start: Segment, wall: Surface): Boolean = {
val normal = Ray(-wall.y, wall.x, Point(0, 0))
val rebased = Ray(start.x, start.y, Point(0, 0))
val cosAngle = normal.dot(rebased) / (normal.mag * rebased.mag)
cosAngle > 0
}
val continuedIntersections = intersections
.filter(i => {
val otherT = i._1.tFor(i._2)
otherT.map(t => t >= 0 && t <= 1).getOrElse(true)
})
val stoppedIntersections = intersections
.filter(i => {
val otherT = i._1.tFor(i._2)
otherT.map(t => t >= 0 && t <= 1 && isBehind(asSeg, i._1)).getOrElse(false)
})
*/
def fnMin(x: (Surface, Point), y: (Surface, Point)) = if (asSeg.tFor(x._2).get < asSeg.tFor(y._2).get) x else y
/*
val firstStop: Option[(Surface, Point)] = stoppedIntersections.reduceOption(fnMin(_, _))
val firstReflect: Option[(Surface, Point)] = continuedIntersections.reduceOption(fnMin(_, _))
(firstStop, firstReflect) match {
case (None, None) =>
(r, Ray(r.x, r.y, r.toSegment.at(1)))
case (Some(stop), None) =>
(r.endingAt(stop._2), Ray(0, 0, r.initial))
case (None, Some(cont)) => cont._1.scatter(r, cont._2) //reflect(cont)// reflect
case (Some(stop), Some(cont)) => {
if (fnMin(stop, cont) == stop) {
(r.endingAt(stop._2), Ray(0, 0, r.initial))
// stop
} else {
cont._1.scatter(r, cont._2)
//reflect(cont)
// reflect
}
}
}
*/
val firstInteraction = intersections
// .map(x => {println("maybe " + x._1); x})
.filter(i => i._1.tFor(i._2).map(t => t >= 0 && t <= 1).getOrElse(true))
.reduceOption(fnMin(_, _))
firstInteraction match {
case None => (r, Ray(r.x, r.y, r.toSegment.at(1)))
case Some(cont) => cont._1.scatter(r, cont._2)
}
}
}
object Scene {
def generateMirror(r: Double, segments: Int, arcSize: Double, at: Point, rotated: Double): Seq[Segment] = {
val sizePerSegment = arcSize / segments
val points = (0 to segments) map { i =>
val angle = i * sizePerSegment + rotated
at + Point(Math.cos(angle) * r, Math.sin(angle) * r)
}
points.sliding(2).map { case Seq(start, end) =>
Segment.fromPoints(start, end)
}.toSeq
}
def generateParabola(a: Double, b: Double, w: Double, w_i: Double, segments: Int, at: Point, rotated: Double): Seq[Segment] = {
val points = (-segments / 2 to segments / 2) map { i =>
val w_curr = (i / segments.toDouble) * w + w_i
at + Point(a * w_curr, b * w_curr * w_curr)
}
points.sliding(2).map { case Seq(start, end) =>
Segment.fromPoints(start, end)
}.toSeq
}
def rotate(walls: Seq[Segment], angle: Double) =
walls.map(_.rotate(angle))
def rays(number: Int, spacing: Double, centerpoint: Point, direction: Point): Seq[Ray] = {
(0 until number).map { i =>
val x = (i.toDouble - number.toDouble / 2) * spacing
val y = 0
val dx = direction.x
val dy = direction.y
Ray(dx, dy, Point(x, y) + centerpoint)
}
}
}
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