diff --git a/showcases/parallel_parking/__init__.py b/showcases/parallel_parking/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/showcases/parallel_parking/point.py b/showcases/parallel_parking/point.py
new file mode 100644
index 0000000..c4c2ca8
--- /dev/null
+++ b/showcases/parallel_parking/point.py
@@ -0,0 +1,30 @@
+import math
+
+
+class Point2D:
+    def __init__(self, x, y):
+        self.x = x
+        self.y = y
+
+    def __add__(self, other):
+        return Point2D(self.x + other.x, self.y + other.y)
+
+    def __sub__(self, other):
+        return Point2D(self.x - other.x, self.y - other.y)
+
+    @staticmethod
+    def rotate(point, theta):
+        # counter-clockwise; assuming subtracted reference point already
+        x = math.cos(theta) * point.x - math.sin(theta) * point.y
+        y = math.sin(theta) * point.x + math.cos(theta) * point.y
+
+        return Point2D(x, y)
+
+    def move(self, orientation, distance, forward: bool):
+        # move on a straight line with orientation
+        if forward:
+            self.x -= distance * math.sin(orientation)
+            self.y += distance * math.cos(orientation)
+        else:
+            self.x += distance * math.sin(orientation)
+            self.y -= distance * math.cos(orientation)
diff --git a/showcases/parallel_parking/pyglet_playground.py b/showcases/parallel_parking/pyglet_playground.py
new file mode 100644
index 0000000..f702dae
--- /dev/null
+++ b/showcases/parallel_parking/pyglet_playground.py
@@ -0,0 +1,255 @@
+import math
+
+import pyglet
+
+from .point import Point2D
+
+'''
+pyglet works with opengl without any other libs
+
+We want to:
+- render a window, showing 3 cars (2 boxes, 1 with wheel and controllable by keyboard and external data feed)
+- controls: steering (constant angular velocity), driving: True/False, forward: True/False
+assume constant velocity for both angular and motion
+
+TODO: 
+- [DONE] R should be calculated from top wheel position, instead of top_left/top_right (right now we reduce turning_radius as a crude approx)
+- [DONE] update steering continuously while moving (pyglet's key "motion")
+- tests & refactoring
+- to avoid errors between meter and pixels, make them different types
+- collision detection
+- parking success detection
+    - parallel
+    - distance <= epsilon
+- openai gym integration
+    - action vector: [driving, forward, steering]
+    - state vector: 
+        - image itself
+        - center coordinates
+        - simulate radar in real life
+- [OPTIONAL] draw fancy cars
+'''
+
+w = 480
+h = 640
+
+# file:///Users/xiayunsun/Downloads/golf-vii-pa-dimensions.pdf
+golf_h = 4.3
+golf_w = 2
+golf_wheelbase = 2.6
+golf_turning_radius = 9 / 2  # adjust for things like we do not model the wheels exactly
+
+car_h = 160
+pixel_to_meter = car_h / golf_h
+car_w = int(golf_w * pixel_to_meter)
+
+offset = int(0.2 * pixel_to_meter)
+
+
+class CarControl:
+    def __init__(self):
+        self.drive = False
+        self.forward = True
+        self.psi = 0  # in degrees, wheel pointing left is positive
+
+    def __str__(self):
+        return "driving: %s, forward: %s, turning: %s" % (self.drive, self.forward, self.psi)
+
+
+class CarState:
+    # everything in pixel
+    def __init__(self):
+        self._w = car_w
+        self._h = car_h
+        self._wheel_base = golf_wheelbase * pixel_to_meter
+
+        self.x = 3 * offset + 1.5 * self._w
+        self.y = offset + 3.5 * self._h
+
+        self.center = Point2D(self.x, self.y)
+
+        self.v_in_meters = 2 * 1600 / 3600.  # 5 miles per hour
+        self.v = car_h / (golf_h / self.v_in_meters)
+        print("velocity: ", self.v_in_meters, self.v)
+        self.orientation = 0  # radius, left is positive
+
+        # anchor positions, offsets are constant
+        self.bottom_left_offset = Point2D(- 0.5 * self._w, - 0.5 * self._h)
+        self.top_left_offset = Point2D(- 0.5 * self._w, + 0.5 * self._h)
+        self.top_right_offset = Point2D(+ 0.5 * self._w, + 0.5 * self._h)
+        self.bottom_right_offset = Point2D(0.5 * self._w, - 0.5 * self._h)
+
+        self.bottom_left = self.center + self.bottom_left_offset
+        self.top_left = self.center + self.top_left_offset
+        self.top_right = self.center + self.top_right_offset
+        self.bottom_right = self.center + self.bottom_right_offset
+
+        self.last_psi = None
+        self.turning_center = None
+
+    def from_center(self):
+        self.bottom_left = Point2D.rotate(self.bottom_left_offset, self.orientation) + self.center
+        self.top_left = Point2D.rotate(self.top_left_offset, self.orientation) + self.center
+        self.top_right = Point2D.rotate(self.top_right_offset, self.orientation) + self.center
+        self.bottom_right = Point2D.rotate(self.bottom_right_offset, self.orientation) + self.center
+
+    def update_vertices(self, control: CarControl, dt=None):
+
+        # straight-line driving
+        if control.drive:
+            if control.psi == 0:
+                if self.orientation == 0:
+                    if control.forward:
+                        y_delta = self.v * dt
+                    else:
+                        y_delta = -1 * self.v * dt
+                    self.center.y += y_delta
+                    self.from_center()
+
+                else:
+                    # follow orientation
+                    s = self.v * dt
+                    # print("orientation: ", self.orientation)
+                    self.center.move(orientation=self.orientation, distance=s,
+                                     forward=control.forward)
+                    self.from_center()
+
+            # rotate according to control.psi
+            # http://www.asawicki.info/Mirror/Car%20Physics%20for%20Games/Car%20Physics%20for%20Games.html section "curves"
+            else:
+                radius = control.psi / 180. * math.pi
+                R = self._wheel_base / (math.sin(radius))
+                # print(R / pixel_to_meter)
+                if abs(R) < golf_turning_radius * pixel_to_meter:
+                    if R > 0:
+                        R = golf_turning_radius * pixel_to_meter
+                    else:
+                        R = -golf_turning_radius * pixel_to_meter
+                # print(R / pixel_to_meter)
+                omega = self.v / R
+                if control.forward:
+                    theta = omega * dt
+                else:
+                    theta = omega * dt * -1
+
+                self.orientation += theta
+
+                # center should only change when steering angle changed
+                if control.psi != self.last_psi and control.psi != 0:
+                    if control.psi > 0:  # left
+                        self.turning_center = Point2D(
+                            x=self.top_left.x - R * math.cos(radius),
+                            y=self.top_left.y - R * math.sin(radius)
+                        )
+                    else:  # right
+                        self.turning_center = Point2D(
+                            x=self.top_right.x - R * math.cos(radius),
+                            y=self.top_right.y - R * math.sin(radius)
+                        )
+                    self.last_psi = control.psi
+
+                # print(self.turning_center.x, self.turning_center.y)
+
+                # only rotate the middle point
+                self.center = Point2D.rotate(self.center - self.turning_center, theta) + self.turning_center
+                self.from_center()
+
+        l = [
+            self.bottom_left.x, self.bottom_left.y,
+            self.top_left.x, self.top_left.y,
+            self.top_right.x, self.top_right.y,
+            self.bottom_right.x, self.bottom_right.y
+        ]
+        return [int(e) for e in l]
+
+
+class MyWindow(pyglet.window.Window):
+    def __init__(self, height, width):
+        self.control = CarControl()
+        self.car = CarState()
+        super().__init__(height=height, width=width)
+
+
+def run():
+    window = MyWindow(height=h + 2 * offset, width=w + 2 * offset)
+
+    batch = pyglet.graphics.Batch()
+    # draw 2 parked cars
+    batch.add_indexed(4, pyglet.gl.GL_TRIANGLES, None,
+                      [0, 1, 2, 0, 2, 3],
+                      ('v2i', (offset, int(offset + 3 * car_h),
+                               offset, int(offset + 4 * car_h),
+                               offset + car_w, int(offset + 4 * car_h),
+                               offset + car_w, int(offset + 3 * car_h)))
+                      )
+    batch.add_indexed(4, pyglet.gl.GL_TRIANGLES, None,
+                      [0, 1, 2, 0, 2, 3],
+                      ('v2i', (offset, offset,
+                               offset, offset + car_h,
+                               offset + car_w, offset + car_h,
+                               offset + car_w, offset))
+
+                      )
+    # draw player car, start with a box first
+    # todo: draw wheels + body, with a different color
+    car_vertices = batch.add_indexed(4, pyglet.gl.GL_TRIANGLES, None,
+                                     [0, 1, 2, 0, 2, 3],
+                                     ('v2i', tuple(window.car.update_vertices(window.control)))
+                                     )
+
+    # draw a small rectangle represent wheel direction
+    steering_vertices = batch.add_indexed(2, pyglet.gl.GL_LINES, None,
+                                          [0, 1],
+                                          ('v2i', (400, 600,
+                                                   400, 540
+                                                   )))
+
+    @window.event
+    def on_key_press(symbol, modifiers):
+        if symbol == pyglet.window.key.F:
+            window.control.forward = True
+        elif symbol == pyglet.window.key.R:
+            window.control.forward = False
+        elif symbol == pyglet.window.key.D:
+            window.control.drive = not window.control.drive
+        elif symbol == pyglet.window.key.UP:
+            window.control.psi = 0
+            steering_vertices.vertices = [400, 600, 400, 540]
+            window.clear()
+            batch.draw()
+
+        # print("current control:", window.control)
+
+    @window.event
+    def on_text_motion(motion):
+        if motion == pyglet.window.key.MOTION_LEFT:
+            window.control.psi = min(52, window.control.psi + 10)
+        elif motion == pyglet.window.key.MOTION_RIGHT:
+            window.control.psi = max(-52, window.control.psi - 10)
+
+        print("current control:", window.control)
+        window.clear()
+        r = window.control.psi / 180. * math.pi
+        p1 = Point2D.rotate(Point2D(0, 30), r) + Point2D(400, 570)
+        p2 = Point2D.rotate(Point2D(0, -30), r) + Point2D(400, 570)
+        steering_vertices.vertices = [int(e) for e in [p1.x, p1.y, p2.x, p2.y]]
+        batch.draw()
+
+    def update(dt):
+        '''
+        This is where we update the controlled car positions
+        '''
+        # print("scheduled ", dt)
+        # update car_vertices.vertices
+        window.clear()  # important
+        car_vertices.vertices = window.car.update_vertices(window.control, dt)
+        batch.draw()
+        # print("current control:", window.control)
+
+    pyglet.clock.schedule_interval(update, 0.05)
+
+    pyglet.app.run()
+
+
+if __name__ == '__main__':
+    run()
diff --git a/tests/test_common.py b/tests/test_common.py
index f63eb66..318905b 100644
--- a/tests/test_common.py
+++ b/tests/test_common.py
@@ -1,7 +1,5 @@
 import unittest
 
-import numpy as np
-
 from common.policies import *