#!/usr/bin/python
from opencv.cv import *
from opencv.highgui import *
import sys

inpaint_mask = None;
img0 = None;
img = None;
inpainted = None;
prev_pt = cvPoint(-1,-1);

def on_mouse( event, x, y, flags, param ):
    global prev_pt
    if not img :
        return;

    if event == CV_EVENT_LBUTTONUP or not (flags & CV_EVENT_FLAG_LBUTTON):
        prev_pt = cvPoint(-1,-1);
    elif event == CV_EVENT_LBUTTONDOWN:
        prev_pt = cvPoint(x,y);
    elif event == CV_EVENT_MOUSEMOVE and (flags & CV_EVENT_FLAG_LBUTTON) :
        pt = cvPoint(x,y);
        if prev_pt.x < 0:
            prev_pt = pt;
        cvLine( inpaint_mask, prev_pt, pt, cvScalarAll(255), 5, 8, 0 );
        cvLine( img, prev_pt, pt, cvScalarAll(255), 5, 8, 0 );
        prev_pt = pt;
        cvShowImage( "image", img );

if __name__=="__main__":
    filename = "../c/fruits.jpg";
    if len(sys.argv)>=2:
    	filename = sys.argv[1]

    img0 = cvLoadImage(filename,-1)
    if not img0:
    	print "Can't open image '%s'" % filename
        sys.exit(1);

    print "Hot keys:"
    print "\tESC - quit the program"
    print "\tr - restore the original image"
    print "\ti or ENTER - run inpainting algorithm"
    print "\t\t(before running it, paint something on the image)"
    
    cvNamedWindow( "image", 1 );

    img = cvCloneImage( img0 );
    inpainted = cvCloneImage( img0 );
    inpaint_mask = cvCreateImage( cvGetSize(img), 8, 1 );

    cvZero( inpaint_mask );
    cvZero( inpainted );
    cvShowImage( "image", img );
    cvShowImage( "watershed transform", inpainted );
    cvSetMouseCallback( "image", on_mouse, None );

    while True:
        c = cvWaitKey(0);

        if( c == '\x1b' or c=='q'):
            break;

        if( c == 'r' ):
            cvZero( inpaint_mask );
            cvCopy( img0, img );
            cvShowImage( "image", img );

        if( c == 'i' or c == '\012' ):
            cvNamedWindow( "inpainted image", 1 );
            cvInpaint( img, inpaint_mask, inpainted, 3, CV_INPAINT_TELEA );
            cvShowImage( "inpainted image", inpainted );
