Assignment done

src/main/scala/scalashop/HorizontalBoxBlur.scala

@@ -41,8 +41,11 @@ object HorizontalBoxBlur extends HorizontalBoxBlurInterface {
    */
   def blur(src: Img, dst: Img, from: Int, end: Int, radius: Int): Unit = {
   // TODO implement this method using the `boxBlurKernel` method
-
-  ???
+  for(y <- from until end){
+      for(x <- 0 until src.width){
+        dst(x,y) = boxBlurKernel(src, x, y, radius)
+      }
+    }
   }
 
   /** Blurs the rows of the source image in parallel using `numTasks` tasks.
@@ -53,8 +56,10 @@ object HorizontalBoxBlur extends HorizontalBoxBlurInterface {
    */
   def parBlur(src: Img, dst: Img, numTasks: Int, radius: Int): Unit = {
   // TODO implement using the `task` construct and the `blur` method
-
-  ???
+  val r = 0 to src.height by (src.height/(Math.min(numTasks, src.height)))
+  var ranges = r zip r.tail
+  val tasks = ranges.map( { case (from, to) => task(blur(src, dst, from, to, radius)) } )
+  tasks foreach {_.join}
   }
 
 }

src/main/scala/scalashop/VerticalBoxBlur.scala

@@ -43,7 +43,11 @@ object VerticalBoxBlur extends VerticalBoxBlurInterface {
    */
   def blur(src: Img, dst: Img, from: Int, end: Int, radius: Int): Unit = {
     // TODO implement this method using the `boxBlurKernel` method
-    ???
+    for(x <- from until end){
+      for(y <- 0 until src.height){
+        dst(x,y) = boxBlurKernel(src, x, y, radius)
+      }
+    }
   }
 
   /** Blurs the columns of the source image in parallel using `numTasks` tasks.
@@ -54,7 +58,10 @@ object VerticalBoxBlur extends VerticalBoxBlurInterface {
    */
   def parBlur(src: Img, dst: Img, numTasks: Int, radius: Int): Unit = {
     // TODO implement using the `task` construct and the `blur` method
-    ???
+    val r = 0 to src.width by (src.width/(Math.min(numTasks, src.width)))
+    var ranges = r zip r.tail
+    val tasks = ranges.map( { case (from, to) => task(blur(src, dst, from, to, radius)) } )
+    tasks foreach {_.join}
   }
 
 }

src/main/scala/scalashop/package.scala

@@ -43,7 +43,28 @@ package object scalashop extends BoxBlurKernelInterface {
   def boxBlurKernel(src: Img, x: Int, y: Int, radius: Int): RGBA = {
 
     // TODO implement using while loops
-    ???
+    var r = 0
+    var g = 0
+    var b = 0
+    var a = 0
+
+    var count = 0
+
+    var xi = clamp(x-radius, 0, src.width-1)
+    while(xi<=clamp(x+radius, 0, src.width-1)) {
+      var yi = clamp(y-radius, 0, src.height-1)
+      while(yi<=clamp(y+radius, 0, src.height-1)) {
+        r = r + red(src(xi, yi))
+        g = g + green(src(xi, yi))
+        b = b + blue(src(xi, yi))
+        a = a + alpha(src(xi, yi))
+        count = count + 1
+        yi = yi + 1
+      }
+      xi = xi + 1
+    }
+
+    rgba(r/count, g/count, b/count, a/count)
   }
 
   val forkJoinPool = new ForkJoinPool