Merge e9d687459d into 3aedc2f61d

2023-07-22 14:37:08 +05:30 · 2023-07-22 14:37:08 +05:30 · a42fe61ba9
commit a42fe61ba9
--- a/README.md
+++ b/README.md
@ -1,6 +1,6 @@
 # linedraw
 Convert images to vectorized line drawings for plotters.
-![Alt text](./screenshots/1.png?raw=true "")
+![Alt text](./docs/assets/1.png?raw=true "")

 - Exports polyline-only svg file with optimized stroke order for plotters;
 - Sketchy style powered by Perlin noise;
@ -9,44 +9,57 @@ Convert images to vectorized line drawings for plotters.
 ## Dependencies
 Python 2 or 3, PIL/Pillow, numpy, OpenCV (Optional for better performance)

+```shell
+pip install -r requirements.txt
+```
+
 ## Usage
 Convert an image to line drawing and export .SVG format:

 ```shell
-$ python linedraw.py -i input.jpg -o output.svg
+python linedraw.py -i input.jpg -o output.svg
 ```
 Command specs:

 ```
-usage: linedraw.py [-h] [-i [INPUT_PATH]] [-o [OUTPUT_PATH]] [-b] [-nc] [-nh]
-                   [--no_cv] [--hatch_size [HATCH_SIZE]]
-                   [--contour_simplify [CONTOUR_SIMPLIFY]]
+usage: linedraw.py [-h] [-i [INPUT_PATH]] [-o [OUTPUT_PATH]] [-r [RESOLUTION]] [-b] [-nc] [-nh] [--no-cv] [--hatch-size [HATCH_SIZE]] [--contour-simplify [CONTOUR_SIMPLIFY]] [-v]
+                   [--save-settings]

 Convert image to vectorized line drawing for plotters.

-optional arguments:
+options:
  -h, --help            show this help message and exit
  -i [INPUT_PATH], --input [INPUT_PATH]
-                        Input path
+                        Input image path
  -o [OUTPUT_PATH], --output [OUTPUT_PATH]
-                        Output path.
-  -b, --show_bitmap     Display bitmap preview.
-  -nc, --no_contour     Don't draw contours.
-  -nh, --no_hatch       Disable hatching.
-  --no_cv               Don't use openCV.
-  --hatch_size [HATCH_SIZE]
+                        Output image path
+  -r [RESOLUTION], --resolution [RESOLUTION]
+                        Resolution of the output image
+  -b, --show-bitmap     Display bitmap preview.
+  -nc, --no-contour     Don't draw contours.
+  -nh, --no-hatch       Disable hatching.
+  --no-cv               Don't use openCV.
+  --hatch-size [HATCH_SIZE]
                        Patch size of hatches. eg. 8, 16, 32
-  --contour_simplify [CONTOUR_SIMPLIFY]
+  --contour-simplify [CONTOUR_SIMPLIFY]
                        Level of contour simplification. eg. 1, 2, 3
+  -v, --visualize       Visualize the output using turtle
+  --save-settings       To Save the settings to a json file
+
 ```
 Python:

 ```python
 import linedraw
+
+linedraw.argument.resolution = 512  # set arguments
 lines = linedraw.sketch("path/to/img.jpg")  # return list of polylines, eg.
-                                            # [[(x,y),(x,y),(x,y)],[(x,y),(x,y),...],...]
-                                            
-linedraw.visualize(lines)                   # simulates plotter behavior
-                                            # draw the lines in order using turtle graphics.
+# [[(x,y),(x,y),(x,y)],[(x,y),(x,y),...],...]
+
+linedraw.visualize(lines)  # simulates plotter behavior
+# draw the lines in order using turtle graphics.
 ```

+## Future Plans
+1. Rasterised Output
+2. GUI for the tool
--- a/docs/assets/1.png
+++ b/docs/assets/1.png
--- a/images/cameraman.tif
+++ b/images/cameraman.tif
--- a/images/lenna.png
+++ b/images/lenna.png
--- a/images/peppers.png
+++ b/images/peppers.png
--- a/images/test.jpg
+++ b/images/test.jpg
--- a/line_draw/init.py
+++ b/line_draw/init.py
@ -0,0 +1 @@
+from line_draw.helper import sketch
--- a/line_draw/default.py
+++ b/line_draw/default.py
@ -0,0 +1,29 @@
+import json
+
+class Default:
+    export_path = "output/out.svg"
+    show_bitmap = False
+    draw_contours = True
+    draw_hatch = True
+    no_cv = False
+    hatch_size = 16
+    contour_simplify = 2
+    resolution = 1024
+    save_settings = False
+
+    def save(self,settings_path):
+        print("Savings settings to a JSON file")
+        file = open(settings_path, 'w')
+        data = {
+            "resolution": self.resolution,
+            "show_bitmap": self.show_bitmap,
+            "draw_contours": self.draw_contours,
+            "draw_hatch": self.draw_hatch,
+            "use_opencv": not self.no_cv,
+            "hatch_size": self.hatch_size,
+            "contour_simplify": self.contour_simplify
+        }
+        json.dump(data,file)
+        file.close()
+
+argument = Default()
--- a/line_draw/filters.py
+++ b/line_draw/filters.py
--- a/line_draw/helper.py
+++ b/line_draw/helper.py
@ -0,0 +1,235 @@
+from PIL import Image, ImageOps, ImageDraw
+import line_draw.perlin as perlin
+from datetime import datetime
+import os
+
+from line_draw.filters import appmask, F_SobelX, F_SobelY
+from line_draw.default import argument
+from line_draw.util import distsum, is_image_file, extract_file_name_and_extension
+from line_draw.strokesort import sortlines
+
+
+def sketch(input_path, output_path:str):
+    IMAGE = None
+
+    if not is_image_file(input_path):
+        return print("Please provide the path for an image.")
+
+    out_file, out_ext = extract_file_name_and_extension(output_path)
+
+    if not out_file:
+        in_file, in_ext = extract_file_name_and_extension(input_path)
+        out_ext = '.svg'
+        if not output_path.endswith('/'):
+            output_path += '/'
+        output_path += in_file + out_ext
+
+    if out_ext != '.svg':
+         return print("Currently we can only save as svg file")
+
+    try:
+        IMAGE = Image.open(input_path)
+    except FileNotFoundError:
+        return print("The Input File wasn't found. Check Path")
+
+    width, height = IMAGE.size
+
+    IMAGE = IMAGE.convert("L")
+    IMAGE = ImageOps.autocontrast(IMAGE, 10)
+
+    lines = []
+
+    if argument.draw_contours:
+        lines += get_contours(IMAGE.resize((argument.resolution // argument.contour_simplify,
+                                            argument.resolution // argument.contour_simplify * height // width)))
+
+    if argument.draw_hatch:
+        lines += hatch(IMAGE.resize(
+            (argument.resolution // argument.hatch_size, argument.resolution // argument.hatch_size * height // width)))
+
+    lines = sortlines(lines)
+
+    if argument.show_bitmap:
+        disp = Image.new("RGB", (argument.resolution, argument.resolution * height // width), (255, 255, 255))
+        draw = ImageDraw.Draw(disp)
+        for l in lines:
+            draw.line(l, (0, 0, 0), 5)
+        disp.show()
+
+    # if out_ext != '.svg':
+    #     now = datetime.now()
+    #     svg_path = output_path.rsplit('/', 1)[0] + now.strftime("%Y%m%d%H%M%S%f") + '.svg'
+    # else:
+    #     svg_path = output_path
+
+    file = open(output_path, 'w')
+    file.write(make_svg(lines))
+    file.close()
+
+    # if out_ext != '.svg':
+    #     if not is_image_file(output_path):
+    #         return "Output path is not an image path"
+    #     rasterise_image(svg_path,output_path)
+    #     os.remove(svg_path)
+    print(len(lines), "strokes.")
+    if argument.save_settings:
+        argument.save(os.path.dirname(output_path) + '/settings.json')
+    print("done.")
+    return lines
+
+
+def get_contours(image):
+    print("Generating Contours....")
+    image = find_edges(image)
+    image_copy1 = image.copy()
+    image_copy2 = image.rotate(-90, expand=True).transpose(Image.FLIP_LEFT_RIGHT)
+    image_copy1_dots = get_dots(image_copy1)
+    image_copy1_contours = connect_dots(image_copy1_dots)
+    image_copy2_dots = get_dots(image_copy2)
+    image_copy2_contours = connect_dots(image_copy2_dots)
+
+    for i in range(len(image_copy2_contours)):
+        image_copy2_contours[1] = [(c[1], c[0]) for c in image_copy2_contours[i]]
+    contours = image_copy1_contours + image_copy2_contours
+
+    for i in range(len(contours)):
+        for j in range(len(contours)):
+            if len(contours[i]) > 0 and len(contours[j]) > 0:
+                if distsum(contours[j][0], contours[i][-1]) < 8:
+                    contours[i] = contours[i] + contours[j]
+                    contours[j] = []
+
+    for i in range(len(contours)):
+        contours[i] = [contours[i][j] for j in range(0, len(contours[i]), 8)]
+
+    contours = [c for c in contours if len(c) > 1]
+
+    for i in range(0, len(contours)):
+        contours[i] = [(v[0] * argument.contour_simplify, v[1] * argument.contour_simplify) for v in contours[i]]
+
+    for i in range(0, len(contours)):
+        for j in range(0, len(contours[i])):
+            contours[i][j] = int(contours[i][j][0] + 10 * perlin.noise(i * 0.5, j * 0.1, 1)), int(
+                contours[i][j][1] + 10 * perlin.noise(i * 0.5, j * 0.1, 2))
+
+    return contours
+
+
+def find_edges(image):
+    print("Fining Edges....")
+    if argument.no_cv:
+        appmask(image, [F_SobelX, F_SobelY])
+    else:
+        import numpy as np
+        import cv2
+        image = np.array(image)
+        image = cv2.GaussianBlur(image, (3, 3), 0)
+        image = cv2.Canny(image, 100, 200)
+        image = Image.fromarray(image)
+    return image.point(lambda p: p > 128 and 255)
+
+
+def get_dots(image):
+    print("Getting contour points...")
+    PX = image.load()
+    dots = []
+    width, height = image.size
+    for y in range(height - 1):
+        row = []
+        for x in range(1, width):
+            if PX[x, y] == 255:
+                if len(row) > 0:
+                    if x - row[-1][0] == row[-1][-1] + 1:
+                        row[-1] = (row[-1][0], row[-1][-1] + 1)
+                    else:
+                        row.append((x, 0))
+                else:
+                    row.append((x, 0))
+        dots.append(row)
+    return dots
+
+
+def connect_dots(dots):
+    print("Connecting contour points....")
+    contours = []
+    for y in range(len(dots)):
+        for x, v in dots[y]:
+            if v > -1:
+                if y == 0:
+                    contours.append([(x, y)])
+                else:
+                    closest = -1
+                    cdist = 100
+                    for x0, v0 in dots[y - 1]:
+                        if abs(x0 - x) < cdist:
+                            cdist = abs(x0 - x)
+                            closest = x0
+                    if cdist > 3:
+                        contours.append([(x, y)])
+                    else:
+                        found = 0
+                        for i in range(len(contours)):
+                            if contours[i][-1] == (closest, y - 1):
+                                contours[i].append((x, y,))
+                                found = 1
+                                break
+                        if found == 0:
+                            contours.append([(x, y)])
+        for c in contours:
+            if c[-1][1] < y - 1 and len(c) < 4:
+                contours.remove(c)
+    return contours
+
+
+def hatch(image):
+    print("Hatching....")
+    PX = image.load()
+    width, height = image.size
+    lg1 = []
+    lg2 = []
+    for x0 in range(width):
+        for y0 in range(height):
+            x = x0 * argument.hatch_size
+            y = y0 * argument.hatch_size
+            if PX[x0, y0] > 144:
+                pass
+            elif PX[x0, y0] > 64:
+                lg1.append([(x, y + argument.hatch_size / 4), (x + argument.hatch_size, y + argument.hatch_size / 4)])
+            elif PX[x0, y0] > 16:
+                lg1.append([(x, y + argument.hatch_size / 4), (x + argument.hatch_size, y + argument.hatch_size / 4)])
+                lg2.append([(x + argument.hatch_size, y), (x, y + argument.hatch_size)])
+            else:
+                lg1.append([(x, y + argument.hatch_size / 4), (x + argument.hatch_size, y + argument.hatch_size / 4)])
+                lg1.append([(x, y + argument.hatch_size / 2 + argument.hatch_size / 4),
+                            (x + argument.hatch_size, y + argument.hatch_size / 2 + argument.hatch_size / 4)])
+                lg2.append([(x + argument.hatch_size, y), (x, y + argument.hatch_size)])
+    lines = [lg1, lg2]
+    for k in range(0, len(lines)):
+        for i in range(0, len(lines[k])):
+            for j in range(0, len(lines[k])):
+                if lines[k][i] != [] and lines[k][j] != []:
+                    if lines[k][i][-1] == lines[k][j][0]:
+                        lines[k][i] = lines[k][i] + lines[k][j][1:]
+                        lines[k][j] = []
+        lines[k] = [l for l in lines[k] if len(l) > 0]
+    lines = lines[0] + lines[1]
+    for i in range(0, len(lines)):
+        for j in range(0, len(lines[i])):
+            lines[i][j] = int(lines[i][j][0] + argument.hatch_size * perlin.noise(i * 0.5, j * 0.1, 1)), int(
+                lines[i][j][1] + argument.hatch_size * perlin.noise(i * 0.5, j * 0.1, 2)) - j
+    return lines
+
+
+def make_svg(lines):
+    print("Generating SVG file....")
+    out = '<svg xmlns="http://www.w3.org/2000/svg" version="1.1">'
+    for l in lines:
+        l = ",".join([str(p[0] * 0.5) + "," + str(p[1] * 0.5) for p in l])
+        out += '<polyline points="' + l + '" stroke="black" stroke-width="2" fill="none" />\n'
+    out += '</svg>'
+    return out
+
+
+def rasterise_image(svg_image, raster_image):
+    print("Converting image....")
+    # to be implemented
--- a/line_draw/perlin.py
+++ b/line_draw/perlin.py
--- a/line_draw/strokesort.py
+++ b/line_draw/strokesort.py
@ -1,6 +1,6 @@
 from random import *
 from PIL import Image, ImageDraw, ImageOps
-from util import *
+from line_draw.util import *


 def sortlines(lines):
@ -38,8 +38,8 @@ def visualize(lines):
    turtle.mainloop()

 if __name__=="__main__":
-    import linedraw
+    import line_draw
    #linedraw.draw_hatch = False
-    lines = linedraw.sketch("Lenna")
+    lines = line_draw.sketch("Lenna")
    #lines = sortlines(lines)
    visualize(lines)
--- a/line_draw/util.py
+++ b/line_draw/util.py
@ -0,0 +1,22 @@
+import os
+def midpt(*args):
+    xs,ys = 0,0
+    for p in args:
+        xs += p[0]
+        ys += p[1]
+    return xs/len(args),ys/len(args)
+
+def distsum(*args):
+    return sum([ ((args[i][0]-args[i-1][0])**2 + (args[i][1]-args[i-1][1])**2)**0.5 for i in range(1,len(args))])
+
+
+def is_image_file(file_path):
+    image_extensions = ['.jpg', '.jpeg', '.png']
+    tmp,ext = extract_file_name_and_extension(file_path)
+    return ext in image_extensions
+
+
+def extract_file_name_and_extension(file_path):
+    file_name_with_extension = os.path.basename(file_path)
+    file_name, file_extension = os.path.splitext(file_name_with_extension)
+    return file_name, file_extension
--- a/linedraw.py
+++ b/linedraw.py
@ -1,263 +1,68 @@
-from random import *
-import math
 import argparse

-from PIL import Image, ImageDraw, ImageOps
+from line_draw import sketch
+from line_draw.default import argument
+from line_draw.strokesort import visualize

-from filters import *
-from strokesort import *
-import perlin
-from util import *
-
-no_cv = False
-export_path = "output/out.svg"
-draw_contours = True
-draw_hatch = True
-show_bitmap = False
-resolution = 1024
-hatch_size = 16
-contour_simplify = 2
-
-try:
-    import numpy as np
-    import cv2
-except:
-    print("Cannot import numpy/openCV. Switching to NO_CV mode.")
-    no_cv = True
-
-def find_edges(IM):
-    print("finding edges...")
-    if no_cv:
-        #appmask(IM,[F_Blur])
-        appmask(IM,[F_SobelX,F_SobelY])
-    else:
-        im = np.array(IM) 
-        im = cv2.GaussianBlur(im,(3,3),0)
-        im = cv2.Canny(im,100,200)
-        IM = Image.fromarray(im)
-    return IM.point(lambda p: p > 128 and 255)  
-
-
-def getdots(IM):
-    print("getting contour points...")
-    PX = IM.load()
-    dots = []
-    w,h = IM.size
-    for y in range(h-1):
-        row = []
-        for x in range(1,w):
-            if PX[x,y] == 255:
-                if len(row) > 0:
-                    if x-row[-1][0] == row[-1][-1]+1:
-                        row[-1] = (row[-1][0],row[-1][-1]+1)
-                    else:
-                        row.append((x,0))
-                else:
-                    row.append((x,0))
-        dots.append(row)
-    return dots
-    
-def connectdots(dots):
-    print("connecting contour points...")
-    contours = []
-    for y in range(len(dots)):
-        for x,v in dots[y]:
-            if v > -1:
-                if y == 0:
-                    contours.append([(x,y)])
-                else:
-                    closest = -1
-                    cdist = 100
-                    for x0,v0 in dots[y-1]:
-                        if abs(x0-x) < cdist:
-                            cdist = abs(x0-x)
-                            closest = x0
-
-                    if cdist > 3:
-                        contours.append([(x,y)])
-                    else:
-                        found = 0
-                        for i in range(len(contours)):
-                            if contours[i][-1] == (closest,y-1):
-                                contours[i].append((x,y,))
-                                found = 1
-                                break
-                        if found == 0:
-                            contours.append([(x,y)])
-        for c in contours:
-            if c[-1][1] < y-1 and len(c)<4:
-                contours.remove(c)
-    return contours
-
-
-def getcontours(IM,sc=2):
-    print("generating contours...")
-    IM = find_edges(IM)
-    IM1 = IM.copy()
-    IM2 = IM.rotate(-90,expand=True).transpose(Image.FLIP_LEFT_RIGHT)
-    dots1 = getdots(IM1)
-    contours1 = connectdots(dots1)
-    dots2 = getdots(IM2)
-    contours2 = connectdots(dots2)
-
-    for i in range(len(contours2)):
-        contours2[i] = [(c[1],c[0]) for c in contours2[i]]    
-    contours = contours1+contours2
-
-    for i in range(len(contours)):
-        for j in range(len(contours)):
-            if len(contours[i]) > 0 and len(contours[j])>0:
-                if distsum(contours[j][0],contours[i][-1]) < 8:
-                    contours[i] = contours[i]+contours[j]
-                    contours[j] = []
-
-    for i in range(len(contours)):
-        contours[i] = [contours[i][j] for j in range(0,len(contours[i]),8)]
-
-
-    contours = [c for c in contours if len(c) > 1]
-
-    for i in range(0,len(contours)):
-        contours[i] = [(v[0]*sc,v[1]*sc) for v in contours[i]]
-
-    for i in range(0,len(contours)):
-        for j in range(0,len(contours[i])):
-            contours[i][j] = int(contours[i][j][0]+10*perlin.noise(i*0.5,j*0.1,1)),int(contours[i][j][1]+10*perlin.noise(i*0.5,j*0.1,2))
-
-    return contours
-
-
-def hatch(IM,sc=16):
-    print("hatching...")
-    PX = IM.load()
-    w,h = IM.size
-    lg1 = []
-    lg2 = []
-    for x0 in range(w):
-        for y0 in range(h):
-            x = x0*sc
-            y = y0*sc
-            if PX[x0,y0] > 144:
-                pass
-                
-            elif PX[x0,y0] > 64:
-                lg1.append([(x,y+sc/4),(x+sc,y+sc/4)])
-            elif PX[x0,y0] > 16:
-                lg1.append([(x,y+sc/4),(x+sc,y+sc/4)])
-                lg2.append([(x+sc,y),(x,y+sc)])
-
-            else:
-                lg1.append([(x,y+sc/4),(x+sc,y+sc/4)])
-                lg1.append([(x,y+sc/2+sc/4),(x+sc,y+sc/2+sc/4)])
-                lg2.append([(x+sc,y),(x,y+sc)])
-
-    lines = [lg1,lg2]
-    for k in range(0,len(lines)):
-        for i in range(0,len(lines[k])):
-            for j in range(0,len(lines[k])):
-                if lines[k][i] != [] and lines[k][j] != []:
-                    if lines[k][i][-1] == lines[k][j][0]:
-                        lines[k][i] = lines[k][i]+lines[k][j][1:]
-                        lines[k][j] = []
-        lines[k] = [l for l in lines[k] if len(l) > 0]
-    lines = lines[0]+lines[1]
-
-    for i in range(0,len(lines)):
-        for j in range(0,len(lines[i])):
-            lines[i][j] = int(lines[i][j][0]+sc*perlin.noise(i*0.5,j*0.1,1)),int(lines[i][j][1]+sc*perlin.noise(i*0.5,j*0.1,2))-j
-    return lines
-
-
-def sketch(path):
-    IM = None
-    possible = [path,"images/"+path,"images/"+path+".jpg","images/"+path+".png","images/"+path+".tif"]
-    for p in possible:
-        try:
-            IM = Image.open(p)
-            break
-        except FileNotFoundError:
-            print("The Input File wasn't found. Check Path")
-            exit(0)
-            pass
-    w,h = IM.size
-
-    IM = IM.convert("L")
-    IM=ImageOps.autocontrast(IM,10)
-
-    lines = []
-    if draw_contours:
-        lines += getcontours(IM.resize((resolution//contour_simplify,resolution//contour_simplify*h//w)),contour_simplify)
-    if draw_hatch:
-        lines += hatch(IM.resize((resolution//hatch_size,resolution//hatch_size*h//w)),hatch_size)
-
-    lines = sortlines(lines)
-    if show_bitmap:
-        disp = Image.new("RGB",(resolution,resolution*h//w),(255,255,255))
-        draw = ImageDraw.Draw(disp)
-        for l in lines:
-            draw.line(l,(0,0,0),5)
-        disp.show()
-
-    f = open(export_path,'w')
-    f.write(makesvg(lines))
-    f.close()
-    print(len(lines),"strokes.")
-    print("done.")
-    return lines
-
-
-def makesvg(lines):
-    print("generating svg file...")
-    out = '<svg xmlns="http://www.w3.org/2000/svg" version="1.1">'
-    for l in lines:
-        l = ",".join([str(p[0]*0.5)+","+str(p[1]*0.5) for p in l])
-        out += '<polyline points="'+l+'" stroke="black" stroke-width="2" fill="none" />\n'
-    out += '</svg>'
-    return out
-
-
-
-if __name__ == "__main__":
+if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Convert image to vectorized line drawing for plotters.')
-    parser.add_argument('-i','--input',dest='input_path',
-        default='lenna',action='store',nargs='?',type=str,
-        help='Input path')
+    parser.add_argument('-i', '--input', dest='input_path',
+                        default='lenna', action='store', nargs='?', type=str,
+                        help='Input image path')

-    parser.add_argument('-o','--output',dest='output_path',
-        default=export_path,action='store',nargs='?',type=str,
-        help='Output path.')
+    parser.add_argument('-o', '--output', dest='output_path',
+                        default=argument.export_path, action='store', nargs='?', type=str,
+                        help='Output image path')

-    parser.add_argument('-b','--show_bitmap',dest='show_bitmap',
-        const = not show_bitmap,default= show_bitmap,action='store_const',
-        help="Display bitmap preview.")
+    parser.add_argument('-r', '--resolution', dest='resolution',
+                        default=argument.resolution, action='store', nargs='?', type=int,
+                        help='Resolution of the output image')

-    parser.add_argument('-nc','--no_contour',dest='no_contour',
-        const = draw_contours,default= not draw_contours,action='store_const',
-        help="Don't draw contours.")
-       
-    parser.add_argument('-nh','--no_hatch',dest='no_hatch',
-        const = draw_hatch,default= not draw_hatch,action='store_const',
-        help='Disable hatching.')
+    parser.add_argument('-b', '--show-bitmap', dest='show_bitmap',
+                        const=not argument.show_bitmap, default=argument.show_bitmap, action='store_const',
+                        help='Display bitmap preview.')

-    parser.add_argument('--no_cv',dest='no_cv',
-        const = not no_cv,default= no_cv,action='store_const',
-        help="Don't use openCV.")
+    parser.add_argument('-nc', '--no-contour', dest='no_contour',
+                        const=argument.draw_contours, default=not argument.draw_contours, action='store_const',
+                        help="Don't draw contours.")

+    parser.add_argument('-nh', '--no-hatch', dest='no_hatch',
+                        const=argument.draw_hatch, default=not argument.draw_hatch, action='store_const',
+                        help='Disable hatching.')

-    parser.add_argument('--hatch_size',dest='hatch_size',
-        default=hatch_size,action='store',nargs='?',type=int,
-        help='Patch size of hatches. eg. 8, 16, 32')
-    parser.add_argument('--contour_simplify',dest='contour_simplify',
-        default=contour_simplify,action='store',nargs='?',type=int,
-        help='Level of contour simplification. eg. 1, 2, 3')
+    parser.add_argument('--no-cv', dest='no_cv',
+                        const=not argument.no_cv, default=argument.no_cv, action='store_const',
+                        help="Don't use openCV.")
+
+    parser.add_argument('--hatch-size', dest='hatch_size',
+                        default=argument.hatch_size, action='store', nargs='?', type=int,
+                        help='Patch size of hatches. eg. 8, 16, 32')
+
+    parser.add_argument('--contour-simplify', dest='contour_simplify',
+                        default=argument.contour_simplify, action='store', nargs='?', type=int,
+                        help='Level of contour simplification. eg. 1, 2, 3')
+
+    parser.add_argument('-v', '--visualize', dest='visualize',
+                        const=True, default=False, action='store_const',
+                        help='Visualize the output using turtle')
+
+    parser.add_argument('--save-settings', dest='save_settings',
+                        const=not argument.save_settings, default=argument.save_settings, action='store_const',
+                        help='To Save the settings to a json file')

    args = parser.parse_args()
-    
+
+    input_path = args.input_path
    export_path = args.output_path
-    draw_hatch = not args.no_hatch
-    draw_contours = not args.no_contour
-    hatch_size = args.hatch_size
-    contour_simplify = args.contour_simplify
-    show_bitmap = args.show_bitmap
-    no_cv = args.no_cv
-    sketch(args.input_path)
+    argument.draw_hatch = not args.no_hatch
+    argument.contour_simplify = not args.no_contour
+    argument.hatch_size = args.hatch_size
+    argument.contour_simplify = args.contour_simplify
+    argument.show_bitmap = args.show_bitmap
+    argument.no_cv = args.no_cv
+    argument.resolution = args.resolution
+    argument.save_settings = args.save_settings
+    lines = sketch(input_path, export_path)
+    if args.visualize:
+        if lines:
+            visualize(lines)
--- a/output/out.svg
+++ b/output/out.svg
--- a/requirements.txt
+++ b/requirements.txt
@ -0,0 +1,3 @@
+Pillow
+Numpy
+opencv-python
--- a/util.py
+++ b/util.py
@ -1,9 +0,0 @@
-def midpt(*args):
-    xs,ys = 0,0
-    for p in args:
-        xs += p[0]
-        ys += p[1]
-    return xs/len(args),ys/len(args)
-
-def distsum(*args):
-    return sum([ ((args[i][0]-args[i-1][0])**2 + (args[i][1]-args[i-1][1])**2)**0.5 for i in range(1,len(args))])