在 Mac 上使用 Psychopy 版本 1.81.03 我想在图像顶部绘制一个多边形（例如三角形）。到目前为止，我的图像始终保持在顶部，因此隐藏了多边形，无论我放置它们的顺序如何。如果我让多边形比图像晚一帧开始，这也是正确的。
例如，请参阅下面的代码（在编译之前使用 Builder 创建）蓝色正方形和红色三角形应该如何从第 0 帧开始，但是当您运行它时，蓝色正方形总是覆盖红色三角形！？
有没有办法让多边形在上面？在绘制它们之前，我是否需要以某种方式合并图像和多边形？
非常感谢你的帮助！！
塞巴斯蒂安
#!/usr/bin/env python2
# -*- coding: utf-8 -*-
"""
This experiment was created using PsychoPy2 Experiment Builder (v1.81.03), Sun Jan 18 20:44:26 2015
If you publish work using this script please cite the relevant PsychoPy publications
Peirce, JW (2007) PsychoPy - Psychophysics software in Python. Journal of Neuroscience Methods, 162(1-2), 8-13.
Peirce, JW (2009) Generating stimuli for neuroscience using PsychoPy. Frontiers in Neuroinformatics, 2:10. doi: 10.3389/neuro.11.010.2008
"""
from __future__ import division # so that 1/3=0.333 instead of 1/3=0
from psychopy import visual, core, data, event, logging, sound, gui
from psychopy.constants import * # things like STARTED, FINISHED
import numpy as np # whole numpy lib is available, prepend 'np.'
from numpy import sin, cos, tan, log, log10, pi, average, sqrt, std, deg2rad, rad2deg, linspace, asarray
from numpy.random import random, randint, normal, shuffle
import os # handy system and path functions
# Ensure that relative paths start from the same directory as this script
_thisDir = os.path.dirname(os.path.abspath(__file__))
os.chdir(_thisDir)
# Store info about the experiment session
expName = u'test_triangle_over_square' # from the Builder filename that created this script
expInfo = {'participant':'', 'session':'001'}
dlg = gui.DlgFromDict(dictionary=expInfo, title=expName)
if dlg.OK == False: core.quit() # user pressed cancel
expInfo['date'] = data.getDateStr() # add a simple timestamp
expInfo['expName'] = expName
# Data file name stem = absolute path + name; later add .psyexp, .csv, .log, etc
filename = _thisDir + os.sep + 'data/%s_%s_%s' %(expInfo['participant'], expName, expInfo['date'])
# An ExperimentHandler isn't essential but helps with data saving
thisExp = data.ExperimentHandler(name=expName, version='',
extraInfo=expInfo, runtimeInfo=None,
originPath=None,
savePickle=True, saveWideText=True,
dataFileName=filename)
#save a log file for detail verbose info
logFile = logging.LogFile(filename+'.log', level=logging.EXP)
logging.console.setLevel(logging.WARNING) # this outputs to the screen, not a file
endExpNow = False # flag for 'escape' or other condition => quit the exp
# Start Code - component code to be run before the window creation
# Setup the Window
win = visual.Window(size=(1280, 800), fullscr=True, screen=0, allowGUI=False, allowStencil=False,
monitor='testMonitor', color=[0,0,0], colorSpace='rgb',
blendMode='avg', useFBO=True,
)
# store frame rate of monitor if we can measure it successfully
expInfo['frameRate']=win.getActualFrameRate()
if expInfo['frameRate']!=None:
frameDur = 1.0/round(expInfo['frameRate'])
else:
frameDur = 1.0/60.0 # couldn't get a reliable measure so guess
# Initialize components for Routine "trial"
trialClock = core.Clock()
ISI = core.StaticPeriod(win=win, screenHz=expInfo['frameRate'], name='ISI')
square = visual.ImageStim(win=win, name='square',units='pix',
image=None, mask=None,
ori=0, pos=[0, 0], size=[200, 200],
color=u'blue', colorSpace='rgb', opacity=1,
flipHoriz=False, flipVert=False,
texRes=128, interpolate=True, depth=-1.0)
polygon = visual.ShapeStim(win=win, name='polygon',units='pix',
vertices = [[-[200, 300][0]/2.0,-[200, 300][1]/2.0], [+[200, 300][0]/2.0,-[200, 300][1]/2.0], [0,[200, 300][1]/2.0]],
ori=0, pos=[0, 0],
lineWidth=1, lineColor=[1,1,1], lineColorSpace='rgb',
fillColor=u'red', fillColorSpace='rgb',
opacity=1,interpolate=True)
# Create some handy timers
globalClock = core.Clock() # to track the time since experiment started
routineTimer = core.CountdownTimer() # to track time remaining of each (non-slip) routine
#------Prepare to start Routine "trial"-------
t = 0
trialClock.reset() # clock
frameN = -1
# update component parameters for each repeat
# keep track of which components have finished
trialComponents = []
trialComponents.append(ISI)
trialComponents.append(square)
trialComponents.append(polygon)
for thisComponent in trialComponents:
if hasattr(thisComponent, 'status'):
thisComponent.status = NOT_STARTED
#-------Start Routine "trial"-------
continueRoutine = True
while continueRoutine:
# get current time
t = trialClock.getTime()
frameN = frameN + 1 # number of completed frames (so 0 is the first frame)
# update/draw components on each frame
# *square* updates
if frameN >= 0 and square.status == NOT_STARTED:
# keep track of start time/frame for later
square.tStart = t # underestimates by a little under one frame
square.frameNStart = frameN # exact frame index
square.setAutoDraw(True)
# *polygon* updates
if frameN >= 0 and polygon.status == NOT_STARTED:
# keep track of start time/frame for later
polygon.tStart = t # underestimates by a little under one frame
polygon.frameNStart = frameN # exact frame index
polygon.setAutoDraw(True)
# *ISI* period
if t >= 0.0 and ISI.status == NOT_STARTED:
# keep track of start time/frame for later
ISI.tStart = t # underestimates by a little under one frame
ISI.frameNStart = frameN # exact frame index
ISI.start(0.5)
elif ISI.status == STARTED: #one frame should pass before updating params and completing
ISI.complete() #finish the static period
# check if all components have finished
if not continueRoutine: # a component has requested a forced-end of Routine
routineTimer.reset() # if we abort early the non-slip timer needs reset
break
continueRoutine = False # will revert to True if at least one component still running
for thisComponent in trialComponents:
if hasattr(thisComponent, "status") and thisComponent.status != FINISHED:
continueRoutine = True
break # at least one component has not yet finished
# check for quit (the Esc key)
if endExpNow or event.getKeys(keyList=["escape"]):
core.quit()
# refresh the screen
if continueRoutine: # don't flip if this routine is over or we'll get a blank screen
win.flip()
else: # this Routine was not non-slip safe so reset non-slip timer
routineTimer.reset()
#-------Ending Routine "trial"-------
for thisComponent in trialComponents:
if hasattr(thisComponent, "setAutoDraw"):
thisComponent.setAutoDraw(False)
win.close()
core.quit()