使用修改后的轴从imshow（）标记图像上的点

Question

我的问题很简单。我使用imshow（）可视化二维数组，并修改其轴标记和标签。现在，如果我需要在“新”原点上放置一个标记，我该怎么做？如您所见，标记仍然位于原始原点的上方

plt.imshow(vel_meshXY) #vel_meshXY is a 2D array. Image shown below.

# Manipulating the axis ticks and axis tick labels here. 
ax=plt.gca()
ax_labelLoc = np.arange(0,num_steps, 40); ax.set_xticks(ax_labelLoc); ax.set_yticks(ax_labelLoc)
ax.set_xticklabels(np.linspace(turbine_origin[0]-minusX, turbine_origin[0]+plusX, num_steps)[ax_labelLoc])
ax.set_yticklabels(np.linspace(turbine_origin[1]+plusY, turbine_origin[1]-minusY, num_steps)[ax_labelLoc])

# trying to put a marker wrt the 'new' origin 
ax.plot(10, 10, 'o', markersize= 10, color = 'r')