Pyqtgraph点击图像之外

Question

我想知道何时单击图像矩阵外部（在附加的屏幕上，我想知道何时单击黑色空间）。

我的应用程序的目标是了解我何时单击图像框外部，以及了解我是否单击了图像周围黑色空间的左侧、顶部、右侧或底部。

import pyqtgraph as pg
import numpy as np

matrix = np.random.randint(1,10,(100, 100))
print(matrix)

app = pg.mkQApp()

win = pg.GraphicsLayoutWidget()

img = pg.ImageItem()
img.setImage(matrice)
view = win.addViewBox()
view.addItem(img)

def mouse_double_click(event):
            print(event.pos())
            print(event.scenePos())
            print(event.screenPos())

img.scene().sigMouseClicked.connect(mouse_double_click)
win.show()

if __name__ == '__main__':
    pg.exec()

Answer 1

img.mapFromScene(event.scenePos())

返回一个点，可以从该点检索x和y位置，因此函数可以更改为：

def mouse_double_click(event):
    pos = img.mapFromScene(event.scenePos())
    x, y = int(pos.x()), int(pos.y())
    print(f"Click at x = {x}, y = {y}")
    position = ""
    if y >= 100:
        position += "top"
    elif y <= 0:
        position += "bottom"
    if x >= 100:
        position += "right"
    elif x <= 0:
        position += "left"
    if position:
        print(f"The click was on the {position}")