Tracking mouse trajectory

draganddrop.py

"""Drag and drop

Example how to track mouse trajectories under Expyriment by Florian Krause
"""

from expyriment import control, stimuli

control.set_develop_mode(True)
exp = control.initialize()
exp.mouse.show_cursor()

rect = stimuli.Rectangle(size=(100, 100), colour=(255, 0, 0))
rect.preload()
rect.present()
erase = stimuli.Rectangle(size=(100, 100), colour=(0, 0, 0))
erase.preload()

trajectories = []
last_x, last_y = 0, 0

while True:
    exp.keyboard.check()
    event, pos, rt = exp.mouse.wait_press()
    if rect.overlapping_with_position(pos):
        trajectories.append([])
        while exp.mouse.pressed_buttons[0]:
            x, y = exp.mouse.position
            trajectories[-1].append((x, y))
            if x != last_x or y != last_y:
                erase.position = rect.position
                rect.position = (x, y)
                erase.present(clear=False, update=False)
                rect.present(clear=False, update=False)
                exp.screen.update_stimuli([erase, rect])
        print trajectories[-1]