gcode-tools/tools/outline_gcode.py

#!/usr/bin/env python

import sys

pwr = 1
iterations = 100
speed = 3000

def file_bounding_box(f):
    x_min = None
    x_max = None
    y_min = None
    y_max = None
    mode_g1 = False

    for line in f:
        if line.startswith("G1"):
            mode_g1 = True
        elif line.startswith("G0"):
            mode_g1 = False

        if mode_g1:
            x_pos = line.find("X")
            if x_pos > -1:
                x_str = line[x_pos + 1:]
                x_num = float(x_str.split()[0])
                #print("found x: " + str(x_num))
                if (x_min == None) or (x_num < x_min):
                    x_min = x_num
                if (x_max == None) or (x_num > x_max):
                    x_max = x_num

            y_pos = line.find("Y")
            if y_pos > -1:
                y_str = line[y_pos + 1:]
                y_num = float(y_str.split()[0])
                #print("found y: " + str(y_num))
                if (y_min == None) or (y_num < y_min):
                    y_min = y_num
                if (y_max == None) or (y_num > y_max):
                    y_max = y_num

    return ( x_min, x_max, y_min, y_max )

def write_outline(f, bb):
    def write(s):
        #print(s)
        f.write(s + "\n")

    x_min, x_max, y_min, y_max = bb

    print("x_min: " + str(x_min))
    print("x_max: " + str(x_max))
    print("y_min: " + str(y_min))
    print("y_max: " + str(y_max))

    pos = [
        ( x_min, y_min ),
        ( x_max, y_min ),
        ( x_max, y_max ),
        ( x_min, y_max ),
    ]

    # header
    write("G90")
    write("G28")
    write("G92 X0 Y-20")
    write("M3 I")
    write("M3 S0")

    write("G0 X0 Y0 S0 F" + str(speed))
    write("G1 X1 Y0 S1 F" + str(speed))
    write("G0 X0 Y0 S0 F" + str(speed))
    write("G1 X0 Y1 S1 F" + str(speed))
    write("G0 X0 Y0 S0 F" + str(speed))

    write("G0 X" + str(x_min) + " Y" + str(y_min) + " S0 F" + str(speed))

    for i in range(0, iterations):
        for x, y in pos:
            write("G1 X" + str(x) + " Y" + str(y) + " S" + str(pwr) + " F" + str(speed))

    write("M5")
    write("G0 X" + str(x_min) + " Y" + str(y_min) + " S0 F" + str(speed))

def main():
    if len(sys.argv) < 3:
        print("Usage:")
        print("    " + sys.argv[0] + " input.nc output.gcode")
        sys.exit(1)

    in_file = sys.argv[1]
    out_file = sys.argv[2]

    with open(in_file, 'r') as f:
        bb = file_bounding_box(f)

    with open(out_file, 'w') as f:
        write_outline(f, bb)

if __name__ == '__main__':
    main()