docstr: Convert pixel coordinates to Mandelbrot set coordinates.
docstr_tok: ["Convert","pixel","coordinates","to","Mandelbrot","set","coordinates","."]
code: def pixel_to_coords(self, x, y):
      """Convert pixel coordinates to Mandelbrot set coordinates."""
      rx, ry = self.size
      nx = (x / rx - 0.5) * self.scale + self.center[0]
      ny = ((ry - y) / ry - 0.5) * self.scale + self.center[1]
      return [nx, ny]
  
file_path: vispy/examples/demo/gloo/mandelbrot.py
imports: from vispy import app, gloo
label_desc: Use image node_id 7 for calling the Canvas obj's underlying member method code with example usage: obj.pixel_to_coords(x, y) and returns: list