Added common file to store useful functions

koptilnya/common.txt

@@ -0,0 +1,26 @@
+NULL_ENTITY = entity(0)
+
+function deepcopy(orig)
+    local orig_type = type(orig)
+    local copy
+    if orig_type == 'table' then
+        copy = {}
+        for orig_key, orig_value in next, orig, nil do
+            copy[deepcopy(orig_key)] = deepcopy(orig_value)
+        end
+        setmetatable(copy, deepcopy(getmetatable(orig)))
+    else -- number, string, boolean, etc
+        copy = orig
+    end
+    return copy
+end
+
+function table:merge(table1, table2)
+    local newTable = deepcopy(table1)
+
+    for k, v in pairs(table2) do
+        newTable[k] = v
+    end
+
+    return newTable
+end

koptilnya/libs/render.txt

@@ -57,3 +57,13 @@ function render.drawFilledCircle(x, y, radius, seg)
 
     render.drawPoly(cir)
 end
+
+function render.drawRotatedSimpleText(x, y, text, ang)    
+    local m = Matrix()
+    m:translate(Vector(x, y, 0 ))
+    m:rotate(Angle(0, ang, 0))
+        
+    render.pushMatrix(m)
+    render.drawSimpleText(0, 0, text)
+    render.popMatrix()
+end