diff --git a/networks/test.py b/networks/test.py
new file mode 100644
index 0000000..a77782f
--- /dev/null
+++ b/networks/test.py
@@ -0,0 +1,100 @@
+from gdpc import Editor, Block, geometry
+
+
+def cirlce(xm, ym, r):
+    editor = Editor(buffering=True)
+    x = -r
+    y = 0
+    err = 2-2*r
+    while (True):
+        editor.placeBlock((round(xm-x), 102, round(ym+y)),
+                          Block("white_concrete"))
+        editor.placeBlock((round(xm-y), 102, round(ym-x)),
+                          Block("red_concrete"))
+        editor.placeBlock((round(xm+x), 102, round(ym-y)),
+                          Block("blue_concrete"))
+        editor.placeBlock((round(xm+y), 102, round(ym+x)),
+                          Block("green_concrete"))
+        print(xm-x, ym+y)
+        print(xm-y, ym-x)
+        print(xm+x, ym-y)
+        print(xm+y, ym+x)
+        r = err
+        if (r <= y):
+            y += 1
+            err += y*2+1
+        if (r > x or err > y):
+            x += 1
+            err += x*2+1
+        if (x < 0):
+            continue
+        else:
+            break
+
+
+print("\n")
+cirlce(-1606, 758, 20)
+
+
+class Point:
+    def __init__(self, x, y, z):
+        self.x = x
+        self.y = z
+        self.z = y
+
+    def __repr__(self):
+        return f"({self.x} {self.y} {self.z})"
+
+
+def drawLineOverlap(start, end, overlap):
+    # Direction
+    delta_x = end.x - start.x
+    delta_y = end.y - start.y
+
+    if (delta_x < 0):
+        delta_x = -delta_x
+        step_x = -1
+    else:
+        step_x = +1
+
+    if (delta_y < 0):
+        delta_y = -delta_y
+        step_y = -1
+    else:
+        step_y = +1
+
+    delta_2x = 2*delta_x
+    delta_2y = 2*delta_y
+
+    print(start.x, start.y)
+
+    if (delta_x > delta_y):
+        error = delta_2y - delta_x
+        while (start.x != end.x):
+            start.x += step_x
+            if (error >= 0):
+                if (overlap == 'LINE_OVERLAP_MAJOR'):
+                    print(start.x, start.y)
+
+                start.y += step_y
+                if (overlap == 'LINE_OVERLAP_MINOR'):
+                    print(start.x - step_x, start.y)
+                error -= delta_2x
+            error += delta_2y
+            print(start.x, start.y)
+    else:
+        error = delta_2x - delta_y
+        while (start.y != end.y):
+            start.y += step_y
+            if (error >= 0):
+                if (overlap == 'LINE_OVERLAP_MAJOR'):
+                    print(start)
+                start.x += step_x
+                if (overlap == 'LINE_OVERLAP_MINOR'):
+                    print(start.x, start.y - step.y)
+                error -= delta_2y
+            error += delta_2x
+            print(start.x, start.y)
+
+
+drawLineOverlap(Point(-10, 0, 0,), Point(10, 0, 3), "None")