#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
This is an extended version of the base timeByFrames demo, adding
the ability to set the psychopy experiment runtime process priority
and disable python garbage collection to see if either influences
the precision of your frame flips.
"""

from __future__ import division
from __future__ import print_function

from builtins import str
from builtins import range
import gc, numpy
from psychopy import visual, logging, core, event

nIntervals = 500
visual.useFBO = True  # if available (try without for comparison)
disable_gc = False
process_priority = 'normal'  # 'high' or 'realtime'

if process_priority == 'normal':
    pass
elif process_priority == 'high':
    core.rush(True)
elif process_priority == 'realtime':
    # Only makes a diff compared to 'high' on Windows.
    core.rush(True, realtime=True)
else:
    print('Invalid process priority:', process_priority, "Process running at normal.")
    process_priority = 'normal'

if disable_gc:
    gc.disable()

import matplotlib
matplotlib.use('Qt4Agg')  # change this to control the plotting 'back end'
import pylab

win = visual.Window([1280, 1024], fullscr=True, allowGUI=False, waitBlanking=True)
progBar = visual.GratingStim(win, tex=None, mask=None,
    size=[0, 0.05], color='red', pos=[0, -0.9], autoLog=False)
myStim = visual.GratingStim(win, tex='sin', mask='gauss',
    size=300, sf=0.05, units='pix', autoLog=False)

# logging.console.setLevel(logging.INFO)  # uncomment to print log every frame

fliptimes = numpy.zeros(nIntervals + 1)

win.recordFrameIntervals = True
for frameN in range(nIntervals + 1):
    progBar.setSize([2.0 * frameN / nIntervals, 0.05])
    progBar.draw()
    myStim.setPhase(0.1, '+')
    myStim.setOri(1, '+')
    myStim.draw()
    if event.getKeys():
        print('stopped early')
        break
    win.logOnFlip(msg='frame=%i' % frameN, level=logging.EXP)
    fliptimes[frameN] = win.flip()

if disable_gc:
    gc.enable()
core.rush(False)

win.close()

# calculate some values
intervalsMS = pylab.array(win.frameIntervals) * 1000
m = pylab.mean(intervalsMS)
sd = pylab.std(intervalsMS)
# se=sd/pylab.sqrt(len(intervalsMS)) # for CI of the mean

nTotal = len(intervalsMS)
nDropped = sum(intervalsMS > (1.5 * m))
ifis =(fliptimes[1: ]-fliptimes[: -1]) * 1000

# plot the frameintervals
pylab.figure(figsize=[12, 8], )

pylab.subplot2grid((2, 2), (0, 0), colspan=2)
pylab.plot(intervalsMS, '-')
pylab.ylabel('t (ms)')
pylab.xlabel('frame N')
msg = "Dropped/Frames = %i/%i = %.3f%%. Process Priority: %s, GC Disabled: %s"
pylab.title(msg % (nDropped, nTotal, 100 * nDropped/float(nTotal),
                   process_priority, str(disable_gc)), fontsize=12)

pylab.subplot2grid((2, 2), (1, 0))
pylab.hist(intervalsMS, 50, normed=0, histtype='stepfilled')
pylab.xlabel('t (ms)')
pylab.ylabel('n frames')
msg = "win.frameIntervals\nMean=%.2fms, s.d.=%.2f, 99%%CI(frame)=%.2f-%.2f"
pylab.title(msg % (m, sd, m-2.58 * sd, m + 2.58 * sd), fontsize=12)

pylab.subplot2grid((2, 2), (1, 1))
pylab.hist(ifis, 50, normed=0, histtype='stepfilled')
pylab.xlabel('t (ms)')
pylab.ylabel('n frames')
msg = "Inter Flip Intervals\nMean=%.2fms, s.d.=%.2f, range=%.2f-%.2f ms"
pylab.title(msg % (ifis.mean(), ifis.std(), ifis.min(), ifis.max()), fontsize=12)

pylab.tight_layout()
pylab.show()

win.close()
core.quit()

# The contents of this file are in the public domain.
