import numpy as np

#==============================================================================
# 
#==============================================================================
def polar2cart(r, theta, center):

    x = r  * np.cos(theta) + center[0]
    y = r  * np.sin(theta) + center[1]
    return(x, y)    
#==============================================================================



#==============================================================================
# 
#==============================================================================
def img2polar(img, center, final_radius, initial_radius = None, phase_width = 3000):

    if initial_radius is None:
        initial_radius = 0

    theta , R = np.meshgrid(np.linspace(0, 2*np.pi, phase_width), 
                            np.arange(initial_radius, final_radius))

    Xcart, Ycart = polar2cart(R, theta, center)

    Xcart = Xcart.astype(int)
    Ycart = Ycart.astype(int)

    if img.ndim ==3:
        polar_img = img[Ycart,Xcart,:]
        polar_img = np.reshape(polar_img,(final_radius-initial_radius,phase_width,3))
    else:
        polar_img = img[Ycart,Xcart]
        polar_img = np.reshape(polar_img,(final_radius-initial_radius,phase_width))

    return(polar_img)
#==============================================================================


#%%
#polar_img = img2polar(x_t1, [100,100], 80, None, 80)