Scripts: fov.py

# Shortcuts to change the field of view.

def increase_field_of_view(degrees = 1):
  import chimera
  k = chimera.viewer.camera
  k.fieldOfView = max(1, min(179, k.fieldOfView + degrees))

def decrease_field_of_view(degrees = -1):
  increase_field_of_view(degrees)

# Register shortcuts.
from Accelerators import add_accelerator
add_accelerator('f+', 'Increase field of view by 1 degree',
                increase_field_of_view)
add_accelerator('f-', 'Decrease field of view by 1 degree',
                decrease_field_of_view)

# Mouse mode
class AdjustFieldOfView:

  def __init__(self):
    self.last_xy = None
    callbacks = (self.mouse_down_cb, self.mouse_drag_cb, self.mouse_up_cb)
    icon = None
    from chimera import mousemodes
    mousemodes.addFunction('Field of View', callbacks, icon)

  def mouse_down_cb(self, viewer, event):
    self.last_xy = (event.x, event.y)

  def mouse_drag_cb(self, viewer, event):
    if self.last_xy:
      dy = event.y - self.last_xy[1]
      self.last_xy = (event.x, event.y)
      increase_field_of_view(dy/5)

  def mouse_up_cb(self, viewer, event):
    self.last_xy = None

# Make ctrl-right-mouse adjust field of view
afov = AdjustFieldOfView()
from chimera import mousemodes
mousemodes.setButtonFunction('3', ['Ctrl'], 'Field of View')