task 8.2

src/imagefilters/ImageFilters.scala

@@ -102,4 +102,48 @@ object ImageFilters {
       }
     })
   }
+
+  def getAvgInPixel(a: Array[Array[Color]], pixelSize: Int, px: Int, py: Int): Color = {
+    val width: Int = a.length
+    val height: Int = if (width == 0) 0 else a(0).length
+    var r: Double = 0
+    var g: Double = 0
+    var b: Double = 0
+    var cnt: Int = 0
+    for (x: Int <- px*pixelSize until (px+1)*pixelSize) {
+      for (y: Int <- py*pixelSize until (py+1)*pixelSize) {
+        if (x < width && y < height) {
+          cnt += 1
+          r += a(x)(y).getRed
+          g += a(x)(y).getGreen
+          b += a(x)(y).getBlue
+        }
+      }
+    }
+    return new Color((r/cnt).toInt, (g/cnt).toInt, (b/cnt).toInt)
+  }
+  def pixelize(a: Array[Array[Color]], pixelSize: Int): Array[Array[Color]] = {
+    val width: Int = a.length
+    val height: Int = if (width == 0) 0 else a(0).length
+    val hPixels: Int = Math.ceil(width.toDouble/pixelSize).toInt
+    val vPixels: Int = Math.ceil(height.toDouble/pixelSize).toInt
+    val pixels: Array[Array[Color]] = Array.ofDim[Color](hPixels, vPixels)
+    for (x: Int <- 0 until hPixels) {
+      for (y: Int <- 0 until vPixels) {
+        pixels(x)(y) = getAvgInPixel(a, pixelSize, x, y)
+      }
+    }
+
+    colorFilter(a, (col, x, y, w, h) => pixels(x/pixelSize)(y/pixelSize))
+  }
+
+  def pixelize(a: Array[Array[Color]], pixelSize: Int, x1: Int, y1: Int, x2: Int, y2: Int): Array[Array[Color]] = {
+    val pixelated: Array[Array[Color]] = pixelize(a, pixelSize)
+    colorFilter(a, (col, x, y, w, h) => {
+      if (x1 <= x && x <= x2 && y1 <= y && y <= y2) {
+        pixelated(x)(y)
+      }
+      else col
+    })
+  }
 }