Road tunnels

See here on how to create road plugins.

To add tunnel support to a road it's sufficient to add the following code to the plugin:

"tunnel frames": [
  {"x": 896, "y": 192, "w": 16, "h":19, "handle y": 7},
  {"x": 912, "y": 192, "w": 16, "h":19, "handle x": -16, "handle y": 7},
  {"x": 928, "y": 192, "w": 16, "h":19, "handle y": 7},
  {"x": 944, "y": 192, "w": 16, "h":19, "handle x": -16, "handle y": 7}
]

Tunnels will then use the default tunnel frames (16x19 pixels each):

You may use your own frames. Take care to set the handles of each frame correctly (they are used to position the frame for drawing). This might look like:

"tunnel frames":[
  {"bmp": "tunnel_frames.png", "x": 0, "w": 16, "h": 19, "handle y": 7},
  {"bmp": "tunnel_frames.png", "x": 16, "w": 16, "h": 19, "handle x": -16, "handle y": 7},
  {"bmp": "tunnel_frames.png", "x": 32, "w": 16, "h": 19, "handle y": 7},
  {"bmp": "tunnel_frames.png", "x": 48, "w": 16, "h": 19, "handle x": -16, "handle y": 7}
]

_{This page has been adapted from a topic on the official TheoTown forum.}