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import cv2
import os

def load_all_files(folder_path):
    files = os.listdir(folder_path)
    img_files = []
    for x in files:     
        if x.endswith('.jpg') or x.endswith('.png'):
            img_files.append(os.path.join(folder_path,x))
    
    return img_files


mouseX = 0
mouseY = 0
color = [255,0,0]
def get_rect_pos(file):

    outter_pts = []
    inner_pts = []
    mode = 0
    def draw_circle(event,x,y,flags,param):
        global mouseX,mouseY,color
        if event == cv2.EVENT_LBUTTONDBLCLK:
            if mode == 0:
                outter_pts.append((x,y))
            else:
                color = [0,0,255]
                inner_pts.append((x,y))
            
            cv2.circle(img,(x,y),10,(color[0],color[1],color[2]),-1)
            global mouseX,mouseY
            mouseX,mouseY = x,y
        #else if event == cv2.EVENT_RBUTTONCLK:
        #    quit = True
            
    cv2.namedWindow('image')
    cv2.setMouseCallback('image',draw_circle)

    img = cv2.imread(file)
    
    while( 1 ):
        cv2.imshow('image',img)
        k = cv2.waitKey(20) & 0xFF
        if k == 27:#esc
            break
        if k == 32:#space
            mode = 1
            print('switch to inner pts')
        elif k == ord('a'):
            #global mouseX,mouseY
            #print(mouseX,mouseY)
            print('outter')
            for x in outter_pts:
                print(x[0],x[1])
            print('inner')
            for x in inner_pts:
                print(x[0],x[1])

    return outter_pts,inner_pts

def draw_lines(img_path,outter_pts,inner_pts):
    img = cv2.imread(img_path)
    #draw lines
    cv2.line(img,outter_pts[0],outter_pts[1],(255,0,0),3)
    cv2.line(img,outter_pts[0],outter_pts[3],(255,0,0),3)
    cv2.line(img,outter_pts[2],outter_pts[3],(255,0,0),3)
    cv2.line(img,outter_pts[2],outter_pts[1],(255,0,0),3)    
    
    cv2.line(img,inner_pts[0],inner_pts[1],(0,0,255),3)
    cv2.line(img,inner_pts[0],inner_pts[3],(0,0,255),3)
    cv2.line(img,inner_pts[2],inner_pts[3],(0,0,255),3)
    cv2.line(img,inner_pts[2],inner_pts[1],(0,0,255),3)  

    def draw_line(pt0,pt1,pt2,pt3,ratio,color):
        cv2.line(img,((int)(pt0[0]*(1-ratio) + pt3[0]*ratio),(int)(pt0[1]*(1-ratio) + pt3[1]*ratio)) ,\
            ((int)(pt1[0]*(1-ratio) + pt2[0]*ratio),(int)(pt1[1]*(1-ratio) + pt2[1]*ratio)),color,3)
        cv2.line(img,((int)(pt0[0]*(1-ratio) + pt1[0]*ratio),(int)(pt0[1]*(1-ratio) + pt1[1]*ratio)) ,\
            ((int)(pt3[0]*(1-ratio) + pt2[0]*ratio),(int)(pt3[1]*(1-ratio) + pt3[1]*ratio)),color,3)

    draw_line(outter_pts[0],outter_pts[1],outter_pts[2],outter_pts[3],0.3333,(255,0,0))
    draw_line(outter_pts[0],outter_pts[1],outter_pts[2],outter_pts[3],0.6666,(255,0,0))
    draw_line(inner_pts[0],inner_pts[1],inner_pts[2],inner_pts[3],0.3333,(0,0,255))
    draw_line(inner_pts[0],inner_pts[1],inner_pts[2],inner_pts[3],0.6666,(0,0,255))

    #cv2.setMouseCallback('image',None)
    #cv2.imshow("image",img)
    #cv2.waitKey()
    cv2.imwrite(img_path+'_with_grid.jpg',img)

import sys
if __name__ == '__main__':

    folder_path  = r"E:\origin"
    if len(sys.argv) > 1:
        folder_path = sys.argv[1]

    img_files = load_all_files(folder_path)

    outter_pts,inner_pts = get_rect_pos(img_files[0])#r"E:\origin\img1.png")
    for x in img_files:
        draw_lines(x,outter_pts,inner_pts)