From f2a214e61af00b887808656b4e2d09132ce472a7 Mon Sep 17 00:00:00 2001
From: Valansch <mail@maikwild.de>
Date: Tue, 11 Sep 2018 17:39:09 +0200
Subject: [PATCH] Implemented Mask.blurr

---
 Diggy/Mask.lua | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/Diggy/Mask.lua b/Diggy/Mask.lua
index 5f30c629..af6819a9 100644
--- a/Diggy/Mask.lua
+++ b/Diggy/Mask.lua
@@ -1,6 +1,42 @@
 -- this
 local Mask = {}
 
+
+   local blurrFilters = {}
+   blurrFilters[5] = {
+        {0.003765,    0.015019,    0.023792,    0.015019,    0.003765},
+        {0.015019,    0.059912,    0.094907,    0.059912,    0.015019},
+        {0.023792,    0.094907,    0.150342,    0.094907,    0.023792},
+        {0.015019,    0.059912,    0.094907,    0.059912,    0.015019},
+        {0.003765,    0.015019,    0.023792,    0.015019,    0.003765}
+    }
+    local n = 5;
+
+
+--[[--
+    Applies a blurr filter.
+
+    @param x_start number, center point
+    @param y_start number, center point
+    @param factor relative strengh of the entity to withstand the pressure
+        factor < 0 if entity is placed
+        factor > 0 if entity is removed number
+    @param callback function to execute on each tile within the mask callback(x, y, value)
+]]
+function Mask.blurr(x_start, y_start, factor, callback)
+    local filter = blurrFilters[n]
+    local offset = - math.floor(n / 2) - 1 --move matrix over x_start|y_start and adjust for 1 index
+    for x = 1, n do
+        for y = 1, n do
+            cell = filter[x][y]
+            value = factor * cell
+            callback(x_start + x + offset, y_start + y + offset, value)
+        end
+    end
+end
+
+
+
 --[[--
     Masks in the shape of a circle.