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import bpy
from mathutils import Vector
from bpy.props import FloatVectorProperty
class ViewOperator(bpy.types.Operator):
'''Translate the view using mouse events.'''
bl_idname = "view3d.modal_operator"
bl_label = "Simple View Operator"
offset = FloatVectorProperty(name="Offset", size=3)
def execute(self, context):
v3d = context.space_data
rv3d = v3d.region_3d
rv3d.view_location = self._initial_location + Vector(self.properties.offset)
def modal(self, context, event):
v3d = context.space_data
rv3d = v3d.region_3d
if event.type == 'MOUSEMOVE':
self.properties.offset = (self._initial_mouse - Vector((event.mouse_x, event.mouse_y, 0.0))) * 0.02
self.execute(context)
elif event.type == 'LEFTMOUSE':
return {'FINISHED'}
elif event.type in ('RIGHTMOUSE', 'ESC'):
rv3d.view_location = self._initial_location
return {'CANCELLED'}
return {'RUNNING_MODAL'}
def invoke(self, context, event):
if context.space_data.type == 'VIEW_3D':
v3d = context.space_data
rv3d = v3d.region_3d
context.manager.add_modal_handler(self)
if rv3d.view_perspective == 'CAMERA':
rv3d.view_perspective = 'PERSP'
self._initial_mouse = Vector((event.mouse_x, event.mouse_y, 0.0))
self._initial_location = rv3d.view_location.copy()
return {'RUNNING_MODAL'}
else:
self.report({'WARNING'}, "Active space must be a View3d")
return {'CANCELLED'}
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