svg2gcode/svg2gcode.py

#!/usr/bin/python

from __future__ import absolute_import
from __future__ import print_function
import sys
import os
import argparse
import xml.etree.ElementTree as ET
import shapes as shapes_pkg
from shapes import point_generator
from config import *

debug = True
example_usage = "-i test_data/Test_H.svg -o test_data/test.gcode -fr 300 -mr 1200 -p 1 -lp 20%"
svg_shapes = set(['rect', 'circle', 'ellipse', 'line', 'polyline', 'polygon', 'path'])
gcode_file_path = " "

def gcode_write(gcode_file, gcode):
    if (debug):
        for cmd in gcode.split("\n"):
            if len(cmd):
                print("[GCODE] " + str(cmd))
    gcode_file.write(gcode)

def close_on_failure():
    os.remove(gcode_file_path)
    sys.exit(1)

def parse_arguments():
    parser = argparse.ArgumentParser(description='Generate gcode from vector graphics.')

    parser.add_argument("-i", "--input", dest='inputfile', metavar='image.svg', help="path to vector graphic file", required=True)
    parser.add_argument("-o", "--output", dest='outputfile', metavar='data.gcode', help="path to file for generated gcode", required=True)

    parser.add_argument("-fr", "--feedrate", dest='feedrate', metavar=300, default=300, help="rate while laser is on", required=False)
    parser.add_argument("-mr", "--moverate", dest='moverate', metavar=1200, default=1200, help="rate while laser is off", required=False)

    parser.add_argument("-p", "--passes", dest='passes', metavar=1, default=1, help="number of passes (for deeper cutting)", required=False)
    parser.add_argument("-lp", "--laserpower", dest='laserpower', metavar="0%", default="0%", help="laser power in %%", required=False)

    parser.add_argument("-bx", "--bedsizex", dest='bedsizex', default="376", help="x size of bed in mm", required=False)
    parser.add_argument("-by", "--bedsizey", dest='bedsizey', default="315", help="y size of bed in mm", required=False)

    parser.add_argument("-s", "--smoothness", dest='smoothness', metavar=0.2, default=0.2, help="Used to control the smoothness/sharpness of the curves.\nSmaller the value greater the sharpness.\nMake sure the value is greater than 0.1", required=False)

    args = parser.parse_args()
    return [args.inputfile, args.outputfile, int(args.feedrate), int(args.moverate), int(args.passes), ((float(args.laserpower.split("%")[0])/100.0)), int(args.bedsizex), int(args.bedsizey), float(args.smoothness) ]

def read_input_file(svg_file_path):
    try:
        tree = ET.parse(svg_file_path)
        return tree.getroot()
    except Exception as e:
        print("unable to read svg file: \n" + str(e))
        sys.exit(1)

def generate_gcode(svg_file_root_tree, gcode_file):   
    generated_points_count = 0 
    width = svg_file_root_tree.get('width')
    height = svg_file_root_tree.get('height')
    if width == None or height == None:
        viewbox = svg_file_root_tree.get('viewBox')
        if viewbox:
            if (debug): print("Using viewbox size")
            _, _, width, height = viewbox.split()                
    if width == None or height == None:
        print("Unable to get width and height for the svg")
        close_on_failure()
    width = float(width.split("mm")[0])
    height = float(height.split("mm")[0])
    print("[SVG loaded] With:" + str(width) + "mm Height:" + str(height) + "mm")

    #generate start cmds's 
    gcode_write(gcode_file, preamble)

    
    for elem in svg_file_root_tree.iter():
        try:
            _, tag_suffix = elem.tag.split('}')
        except ValueError:
            continue
        if tag_suffix in svg_shapes:
            shape_class = getattr(shapes_pkg, tag_suffix)
            shape_obj = shape_class(elem)
            obj_path = shape_obj.d_path()
            obj_trans_matrix = shape_obj.transformation_matrix()

            if obj_path:
                gcode_write(gcode_file, "; == Start of " + tag_suffix + " ==\n") 
                points = point_generator(obj_path, obj_trans_matrix, smoothness)
                num_points = 0
                for x,y in points:
                    if (debug): print("[Point] X: " + str(x) + " Y: " + str(y))
                    if x > 0 and x < bed_max_x and y > 0 and y < bed_max_y:  
                        gcode_write(gcode_file, "G1 X%0.001f Y%0.001f\n" % (x, y))
                        num_points += 1
                        if (num_points == 1):
                            gcode_write(gcode_file, "M3 I S15 ;start laser\n")
                    elif (debug):
                        print("\n; Coordinates out of range:", "G1 X%0.01f Y%0.01f" % (x, y))
                        print("; Raw:", str(x), str(y), "\nScaled:", str(x), str(y), "\n")
                        close_on_failure()
                gcode_write(gcode_file, "M5 ;stop laser\n")
                gcode_write(gcode_file, "; == End of " + tag_suffix + " ==\n") 
                generated_points_count += num_points

    gcode_write(gcode_file, postamble) 
    print("\nGenerated", generated_points_count, "points")

if __name__ == "__main__":
    sys.setrecursionlimit(20000) #needed for svg's with more indepented paths

    svg_file_path, gcode_file_path, feedrate, moverate, passes, laserpower, bedsizex, bedsizey, smoothness = parse_arguments()

    print("inputfile: " + str(svg_file_path))
    print("outputfile: " + str(gcode_file_path))
    print("feedrate: " + str(feedrate))
    print("moverate: " + str(moverate))
    print("passes: " + str(passes))
    print("laserpower: " + str(laserpower))
    print("bedsizex: " + str(bedsizex))
    print("bedsizey: " + str(bedsizey))
    print("smoothness: " + str(smoothness)) 

    try:
        with open(gcode_file_path, 'w') as gcode_file:
            generate_gcode(read_input_file(svg_file_path),gcode_file)
    except Exception as e:
        print("unable to create gcode file: \n" + str(e))
        close_on_failure()