diff --git a/.gitignore b/.gitignore
index 2219fba..63d07bc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 .vscode/
+__pycache__
 sphere_grid.egg-info
\ No newline at end of file
diff --git a/README.md b/README.md
index 6d381e9..df63262 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,14 @@
+# Motivations
+
+I just like this FFX game design idea and I want to test some python tools I haven’t used in projects yet such as ruff and pytest.
+
+No clear roadmap, just 2D graphics fun
+
 # Roadmap ideas
 
 - [ ] seeded RNG
-- [ ] pattern: circle, line
+- [ ] pattern: classic circles, line to connect far away patterns
+- [ ] path finding
 
 # Tools
 
diff --git a/grid/test/test_pattern.py b/grid/test/test_pattern.py
new file mode 100644
index 0000000..29eabbe
--- /dev/null
+++ b/grid/test/test_pattern.py
@@ -0,0 +1,7 @@
+from grid.ui.pattern import Pattern
+
+class TestPattern():
+
+    def test_position(self):
+        p = Pattern(500, 500)
+        assert len(p.childItems()) > 0
\ No newline at end of file
diff --git a/grid/ui/sphere_widget.py b/grid/ui/items.py
similarity index 80%
rename from grid/ui/sphere_widget.py
rename to grid/ui/items.py
index 32f670f..9a09861 100644
--- a/grid/ui/sphere_widget.py
+++ b/grid/ui/items.py
@@ -21,17 +21,17 @@ class ArcGraphicsItem(QGraphicsItem):
 
     def __init__(self, x_pos: int, y_pos: int, width: int, angle_start: int, angle_end: int, parent: QGraphicsItem | None = ...):
         super().__init__(parent)
-        print(f"arc from {x_pos}:{y_pos} of {width} {angle_start}° {angle_end}°")
-        self.x_pos = x_pos
-        self.y_pos = y_pos
-        self.width = width
-        self.angle_start = angle_start
-        self.angle_end = angle_end
+        shift = int(width/2)
+        self.x_pos = x_pos-shift
+        self.y_pos = y_pos-shift
+        self.width = width*2
+        self.angle_start = angle_start*16
+        self.angle_end = angle_end*16
+        print(f"arc from {self.x_pos}:{self.y_pos} of {self.width} {self.angle_start}° {self.angle_end}°")
 
     def paint(self, painter: QPainter, option: QStyleOptionGraphicsItem, widget: QWidget | None = ...) -> None:
-        shift = int(self.width/2)
-        painter.drawArc(self.x_pos-shift, self.y_pos-shift, self.width*2,
-                        self.width*2, self.angle_start*16, self.angle_end*16)
+        painter.drawArc(self.x_pos, self.y_pos, self.width,
+                        self.width, self.angle_start, self.angle_end)
     
     def boundingRect(self) -> QRectF:
         return QRectF(0, 0, self.x_pos, self.y_pos)
diff --git a/grid/ui/pattern.py b/grid/ui/pattern.py
index 10a4710..6b5f45f 100644
--- a/grid/ui/pattern.py
+++ b/grid/ui/pattern.py
@@ -5,12 +5,12 @@ from typing import List, Tuple
 from PySide6.QtWidgets import QGraphicsItemGroup
 from random import randint
 
-from grid.ui.sphere_widget import SphereGraphicsItem, ArcGraphicsItem, LineGraphicsItem
+from grid.ui.items import SphereGraphicsItem, ArcGraphicsItem, LineGraphicsItem
 
 class Pattern(QGraphicsItemGroup):
     """Common pattern on the sphere grid
     """
-    
+
     PATTERN_WIDTH = 250
     SPACE_BETWEEN_SPHERE = 60
     
@@ -22,6 +22,7 @@ class Pattern(QGraphicsItemGroup):
 
         # center
         self.addToGroup(SphereGraphicsItem(center_x, center_y))
+        self.addToGroup(SphereGraphicsItem(0, 0))
 
         # first cercle
         sphere_on_circle = 4
@@ -43,8 +44,9 @@ class Pattern(QGraphicsItemGroup):
         points = self.generate_circle_points(center_x, center_y, self.SPACE_BETWEEN_SPHERE*2, sphere_on_circle)
         for x,y in points:
             self.addToGroup(SphereGraphicsItem(x, y))
-        #for i in range(sphere_on_circle):
-        #    self.addToGroup(ArcGraphicsItem(center_x, center_y, self.SPACE_BETWEEN_SPHERE*2, int(i*360/sphere_on_circle/4)%360, int((i+1)*360/sphere_on_circle)%360, self))
+        for i in range(sphere_on_circle):
+            self.addToGroup(ArcGraphicsItem(center_x, center_y, self.SPACE_BETWEEN_SPHERE*2, int(i*360/sphere_on_circle/4)%360, int((i+1)*360/sphere_on_circle)%360, self))
+        self.addToGroup(ArcGraphicsItem(center_x, center_y, self.SPACE_BETWEEN_SPHERE*2, 0, 90, self))
 
         # third cercle
         sphere_on_circle = 8
diff --git a/grid/ui/window.py b/grid/ui/window.py
index 10e8b23..d2b61d8 100644
--- a/grid/ui/window.py
+++ b/grid/ui/window.py
@@ -18,22 +18,16 @@ class Window(QWidget):
         self.setWindowTitle("sphere grid")
         self.setGeometry(0, 0, 600, 600)
 
-        self.scene = QGraphicsScene(0, 0, 600, 400)
+        self.scene = QGraphicsScene(0, 0, 600, 600)
 
-        pp = Pattern(200, 100)
-        #for wid in pp.content:
-        #    self.scene.addItem(wid)
+        pp = Pattern(300, 300)
 
         self.scene.addItem(pp)
 
-        # Define our layout.
-        hbox = QHBoxLayout()
-
         view = QGraphicsView(self.scene)
         view.setRenderHint(QPainter.RenderHint.Antialiasing)
 
         vbox = QHBoxLayout(self)
-        vbox.addLayout(hbox)
         vbox.addWidget(view)
 
         self.setLayout(vbox)
diff --git a/requirements.txt b/requirements.txt
index 8e98247..629a7b4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
 pyside6==6.6.1
+pytest==8.3.3
\ No newline at end of file