图像放大时，如何获取图像像素坐标

[3247844618]

图像放大时，如何获取显示框中心的图像像素坐标

[wkentaro]

When the image is zoomed in, how can I get the image pixel coordinate at the center of the display frame?

When you zoom in, the status bar already shows the image pixel coordinate under the mouse cursor in real time (it already accounts for zoom and scroll), in the format x=..., y=.... So you can just move the cursor to the spot you care about and read its image pixel coordinate directly.

You can see the implementation in canvas.py: on mouse move, pos = self._transform_point_widget_to_image(a0.localPos()) converts the widget coordinate into the image pixel coordinate, which is then shown in the status bar.

If what you actually need is the coordinate of the center of the display frame (rather than the cursor position), that's usually for recording or jumping back to the location you're currently viewing. Could you share your specific use case?

• If you just want to read off coordinates, move the cursor to the center and read the status bar.
• If you need the viewport-center image pixel coordinate in code, that's a small change (apply the same _transform_point_widget_to_image conversion to the viewport center point), and I can add it.