prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Color patches takes a long time to load
  When you hit "reset" to load the color patches example, it takes a long time to load.
  Not sure why. As a result, I thought it was broken.
  
  To recreate... 
  ```
  cd examples/color_patches
  python run.py
  ```
  
  Wait for patches to load when browser window pops up. 
  OR hit reset and wait for color patches to load.
  
  This is what it should look something like...
  <img width="407" alt="screen shot 2018-04-01 at 10 03 33 pm" src="https://user-images.githubusercontent.com/166734/38180194-95c2acb0-35f8-11e8-8c1b-8bd7a6d25098.png">
  Color patches takes a long time to load
  When you hit "reset" to load the color patches example, it takes a long time to load.
  Not sure why. As a result, I thought it was broken.
  
  To recreate... 
  ```
  cd examples/color_patches
  python run.py
  ```
  
  Wait for patches to load when browser window pops up. 
  OR hit reset and wait for color patches to load.
  
  This is what it should look something like...
  <img width="407" alt="screen shot 2018-04-01 at 10 03 33 pm" src="https://user-images.githubusercontent.com/166734/38180194-95c2acb0-35f8-11e8-8c1b-8bd7a6d25098.png">
  
  </issue>
  <code>
  [start of examples/color_patches/color_patches/server.py]
  1 """
  2 handles the definition of the canvas parameters and
  3 the drawing of the model representation on the canvas
  4 """
  5 # import webbrowser
  6 
  7 from mesa.visualization.modules import CanvasGrid
  8 from mesa.visualization.ModularVisualization import ModularServer
  9 
  10 from .model import ColorPatches
  11 
  12 _COLORS = [
  13     "Aqua",
  14     "Blue",
  15     "Fuchsia",
  16     "Gray",
  17     "Green",
  18     "Lime",
  19     "Maroon",
  20     "Navy",
  21     "Olive",
  22     "Orange",
  23     "Purple",
  24     "Red",
  25     "Silver",
  26     "Teal",
  27     "White",
  28     "Yellow",
  29 ]
  30 
  31 
  32 grid_rows = 50
  33 grid_cols = 25
  34 cell_size = 10
  35 canvas_width = grid_rows * cell_size
  36 canvas_height = grid_cols * cell_size
  37 
  38 
  39 def color_patch_draw(cell):
  40     """
  41     This function is registered with the visualization server to be called
  42     each tick to indicate how to draw the cell in its current state.
  43 
  44     :param cell:  the cell in the simulation
  45 
  46     :return: the portrayal dictionary.
  47 
  48     """
  49     assert cell is not None
  50     portrayal = {"Shape": "rect", "w": 1, "h": 1, "Filled": "true", "Layer": 0}
  51     portrayal["x"] = cell.get_row()
  52     portrayal["y"] = cell.get_col()
  53     portrayal["Color"] = _COLORS[cell.get_state()]
  54     return portrayal
  55 
  56 
  57 canvas_element = CanvasGrid(
  58     color_patch_draw, grid_rows, grid_cols, canvas_width, canvas_height
  59 )
  60 
  61 server = ModularServer(
  62     ColorPatches,
  63     [canvas_element],
  64     "Color Patches",
  65     {"width": canvas_width, "height": canvas_height},
  66 )
  67 
  68 # webbrowser.open('http://127.0.0.1:8521')  # TODO: make this configurable
  69
  [end of examples/color_patches/color_patches/server.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/examples/color_patches/color_patches/server.py b/examples/color_patches/color_patches/server.py
  --- a/examples/color_patches/color_patches/server.py
  +++ b/examples/color_patches/color_patches/server.py
  @@ -62,7 +62,7 @@
       ColorPatches,
       [canvas_element],
       "Color Patches",
  -    {"width": canvas_width, "height": canvas_height},
  +    {"width": grid_rows, "height": grid_cols},
   )
   
   # webbrowser.open('http://127.0.0.1:8521')  # TODO: make this configurable
  
verification_info: {"golden_diff": "diff --git a/examples/color_patches/color_patches/server.py b/examples/color_patches/color_patches/server.py\n--- a/examples/color_patches/color_patches/server.py\n+++ b/examples/color_patches/color_patches/server.py\n@@ -62,7 +62,7 @@\n     ColorPatches,\n     [canvas_element],\n     \"Color Patches\",\n-    {\"width\": canvas_width, \"height\": canvas_height},\n+    {\"width\": grid_rows, \"height\": grid_cols},\n )\n \n # webbrowser.open('http://127.0.0.1:8521')  # TODO: make this configurable\n", "issue": "Color patches takes a long time to load\nWhen you hit \"reset\" to load the color patches example, it takes a long time to load.\r\nNot sure why. As a result, I thought it was broken.\r\n\r\nTo recreate... \r\n```\r\ncd examples/color_patches\r\npython run.py\r\n```\r\n\r\nWait for patches to load when browser window pops up. \r\nOR hit reset and wait for color patches to load.\r\n\r\nThis is what it should look something like...\r\n<img width=\"407\" alt=\"screen shot 2018-04-01 at 10 03 33 pm\" src=\"https://user-images.githubusercontent.com/166734/38180194-95c2acb0-35f8-11e8-8c1b-8bd7a6d25098.png\">\nColor patches takes a long time to load\nWhen you hit \"reset\" to load the color patches example, it takes a long time to load.\r\nNot sure why. As a result, I thought it was broken.\r\n\r\nTo recreate... \r\n```\r\ncd examples/color_patches\r\npython run.py\r\n```\r\n\r\nWait for patches to load when browser window pops up. \r\nOR hit reset and wait for color patches to load.\r\n\r\nThis is what it should look something like...\r\n<img width=\"407\" alt=\"screen shot 2018-04-01 at 10 03 33 pm\" src=\"https://user-images.githubusercontent.com/166734/38180194-95c2acb0-35f8-11e8-8c1b-8bd7a6d25098.png\">\n", "before_files": [{"content": "\"\"\"\nhandles the definition of the canvas parameters and\nthe drawing of the model representation on the canvas\n\"\"\"\n# import webbrowser\n\nfrom mesa.visualization.modules import CanvasGrid\nfrom mesa.visualization.ModularVisualization import ModularServer\n\nfrom .model import ColorPatches\n\n_COLORS = [\n    \"Aqua\",\n    \"Blue\",\n    \"Fuchsia\",\n    \"Gray\",\n    \"Green\",\n    \"Lime\",\n    \"Maroon\",\n    \"Navy\",\n    \"Olive\",\n    \"Orange\",\n    \"Purple\",\n    \"Red\",\n    \"Silver\",\n    \"Teal\",\n    \"White\",\n    \"Yellow\",\n]\n\n\ngrid_rows = 50\ngrid_cols = 25\ncell_size = 10\ncanvas_width = grid_rows * cell_size\ncanvas_height = grid_cols * cell_size\n\n\ndef color_patch_draw(cell):\n    \"\"\"\n    This function is registered with the visualization server to be called\n    each tick to indicate how to draw the cell in its current state.\n\n    :param cell:  the cell in the simulation\n\n    :return: the portrayal dictionary.\n\n    \"\"\"\n    assert cell is not None\n    portrayal = {\"Shape\": \"rect\", \"w\": 1, \"h\": 1, \"Filled\": \"true\", \"Layer\": 0}\n    portrayal[\"x\"] = cell.get_row()\n    portrayal[\"y\"] = cell.get_col()\n    portrayal[\"Color\"] = _COLORS[cell.get_state()]\n    return portrayal\n\n\ncanvas_element = CanvasGrid(\n    color_patch_draw, grid_rows, grid_cols, canvas_width, canvas_height\n)\n\nserver = ModularServer(\n    ColorPatches,\n    [canvas_element],\n    \"Color Patches\",\n    {\"width\": canvas_width, \"height\": canvas_height},\n)\n\n# webbrowser.open('http://127.0.0.1:8521')  # TODO: make this configurable\n", "path": "examples/color_patches/color_patches/server.py"}]}