The MotionEvent is the base class used for every touch and no-touch event. This class define all the properties and methods needed to handle 2D and 3D position, but may have more capabilities.
Note
You never create the MotionEvent yourself, this is the role of the ~kivy.input.providers.
We differentiate Motion Event and Touch event. A Touch event is a MotionEvent with the pos profile. Only theses event are dispatched all over the widget tree.
The MotionEvent are gathered from input providers
on_motion().
on_touch_down(),move,up.
If you want to receive all Motion Event, Touch or not, you can bind motion event from Window to your own callbacks
def on_motion(self, etype, motionevent):
# will receive all motion event.
pass
Window.bind(on_motion=on_motion)
A capability is the ability of a MotionEvent to store a new information, or a way to indicate what is supported by the Motion Event. For example, you can receive a Motion Event that have an angle, a fiducial ID, or even a shape. You can check the profile attribute to check what is currently supported by the Motion Event, and how to access on it.
This is a tiny list of the supported profiles by default. Check other input providers to know if they are other profiles available.
Profile name | Description |
angle | 2D angle. Use property a |
markerid | Marker or Fiducial ID. Use property fid |
pos | 2D position. Use properties x, y |
pos3d | 3D position. Use properties x, y, z |
pressure | Pressure of the contact. Use property pressure |
shape | Contact shape. Use property shape |
If yo want to know if the current MotionEvent have an angle
def on_touch_move(self, touch):
if 'angle' in touch.profile:
print 'The touch angle is', touch.a
If you want to select only the fiducials
def on_touch_move(self, touch):
if 'markerid' not in touch.profile:
return
Bases: object
Abstract class to represent a touch and no-touch object.
Parameters : |
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Apply a transformation on x, y, z, px, py, pz, ox, oy, oz, dx, dy, dz
Copy some attribute to another touch object.
Depack args into attributes in class
Device used for creating this touch
Return the distance between the current touch and another touch.
If the touch is a is_double_tap, this is the time between the previous tap and the current touch.
Return delta between last position and current position, in the screen coordinate system (self.dx, self.dy)
Delta between self.sx and self.psx, in 0-1 range.
Delta between self.sy and self.psy, in 0-1 range.
Delta between self.sz and self.psz, in 0-1 range.
Delta between self.x and self.px, in window range
Delta between self.y and self.py, in window range
Delta between self.z and self.pz, in window range
Grab this motion event. You can grab a touch if you absolutly want to receive on_touch_move() and on_touch_up(), even if the touch is not dispatched by your parent
def on_touch_down(self, touch):
touch.grab(self)
def on_touch_move(self, touch):
if touch.grab_current == self:
# i receive my grabbed touch
else:
# it's a normal touch
def on_touch_up(self, touch):
if touch.grab_current == self:
# i receive my grabbed touch, i must ungrab it !
touch.ungrab(self)
else:
# it's a normal touch
pass
Used to determine which widget the touch is beeing dispatched. Check grab() function for more information.
Id of the touch, not uniq. This is generally the Id set by the input provider, like ID in TUIO. If you have multiple TUIO source, the same id can be used. Prefer to use uid attribute instead.
Indicate if the touch is a double tap or not
Move the touch to another position
Return the initial position of the touch in the screen coordinate system (self.ox, self.oy)
Origin X position, in 0-1 range.
Origin Y position, in 0-1 range.
Origin Z position, in 0-1 range.
Origin X position, in window range
Origin Y position, in window range
Origin Z position, in window range
Pop attributes values from the stack
Return position of the touch in the screen coordinate system (self.x, self.y)
Return the previous position of the touch in the screen coordinate system (self.px, self.py)
Profiles currently used in the touch
Previous X position, in 0-1 range.
Previous Y position, in 0-1 range.
Previous Z position, in 0-1 range.
Push attributes values in attrs in the stack
Attributes to push by default, when we use push() : x, y, z, dx, dy, dz, ox, oy, oz, px, py, pz.
Previous X position, in window range
Previous Y position, in window range
Previous Z position, in window range
Scale position for the screen
Return the position in the 0-1 coordinate system (self.sx, self.sy)
X position, in 0-1 range
Y position, in 0-1 range
Z position, in 0-1 range
Initial time of the touch creation
User data dictionnary. Use this dictionnary to save your own data on the touch.
Uniq ID of the touch. You can safely use this property, it will be never the same accross all existing touches.
Ungrab a previous grabbed touch
X position, in window range
Y position, in window range
Z position, in window range