鼠标滚轮移动光标

Question

我对使用 python 进行编码相当陌生，但我必须在攻读博士学位时学习它。我想编写一个任务，其中在直线上（从上到下）有 4 个可能的位置（这里是圆圈）是目标区域。稍后将呈现与这些目标之一相对应的刺激。之后，受试者必须在线上移动鼠标光标以选择正确的刺激。我想通过电脑鼠标的滚轮进行输入。因此，如果我向上滚动按钮上的光标，沿线移动并且可以放置在其中一个区域上，然后会给予奖励。

我的问题：如何实现鼠标滚轮的输入，将其绑定到光标并限制光标停留在线上（禁用所有其他鼠标移动）？

提前谢谢你。

Answer 1

在 PsychoPy Coder --> Demos --> input --> mouse 中，您将看到一个演示脚本，说明如何对不同类型的鼠标输入做出反应。另请参阅documentation。在代码中，你会做这样的事情，其中​​points 是你线上的坐标列表。

# Your points
points = [[0, 0], [1, 0.5], [2, 1], [3, 1.5]]

# Set up mouse
from psychopy import visual, event
win = visual.Window()  # A mouse must be in a window
mouse = event.Mouse()  # initialize mouse object

# Begin listening
event.clearEvents('mouse')  # Do this in the beginning of every trial, to discard "old" mouse events.
index = 1  # start value
while not any(mouse.getPressed()):  # for this example, keep running until any mouse button is pressed
    #print mouse.getWheelRel()
    scroll_change = int(mouse.getWheelRel()[1])  # returns (x,y) but y is what we understand as scroll.
    if scroll_change != 0:
        index += scroll_change  # increment / decrement index
        index = min(len(points)-1, max(index, 0))  # Round down/up to 0 or number of points
        print points[index]  # print it to show that it works. You would probably do something else here, once you have the coordinates.