Mercurial > hg-public > lasercut-scripts / file comparison
comparison: svg2gcode/gcode.py
svg2gcode/gcode.py
- changeset 4
- 234ad2069fdd
- child 8
- 86f90bddac0f
equal
deleted
inserted
replaced
| 3:a519e3ac3849 | 4:234ad2069fdd |
|---|---|
| 1 import math | |
| 2 | |
| 3 INCH = 25.4 # mm | |
| 4 | |
| 5 class Gcode(object): | |
| 6 def __init__(self, bbox=None, scale=1.0, travel_speed=20, engrave_speed=20): | |
| 7 self.dpi = 300 | |
| 8 self.e_factor = 0.1 | |
| 9 | |
| 10 self.mm_pixel = round(INCH / self.dpi, 4) | |
| 11 self.steps_pixel = self.mm_pixel * 80 # mine is 80 steps/mm on XY | |
| 12 print "Resolution is %f mm per pixel" % self.mm_pixel | |
| 13 if self.steps_pixel <= 5: | |
| 14 print "Warning: Steps per pixel (needs to be > 5, otherwise marlin joins lines): %f" % self.steps_pixel | |
| 15 | |
| 16 self.lines = [] | |
| 17 self.dist_start = (0, 0) | |
| 18 self.dist = 0.0 | |
| 19 | |
| 20 self.scale = scale | |
| 21 self.travel_speed = travel_speed * 60 | |
| 22 self.engrave_speed = engrave_speed * 60 | |
| 23 | |
| 24 def _dimensions(self, x, y): | |
| 25 x = self.mm_pixel * x | |
| 26 y = self.mm_pixel * y | |
| 27 if self.scale != 1.0: | |
| 28 x = x * self.scale | |
| 29 y = y * self.scale | |
| 30 return (x, y) | |
| 31 | |
| 32 def move(self, x, y): | |
| 33 x, y = self._dimensions(x, y) | |
| 34 if self.e_factor > 0: | |
| 35 self.dist_start = (x, y) | |
| 36 self.dist = 0.0 | |
| 37 self.lines.append("G92 E0") # reset extruder length | |
| 38 self.lines.append( | |
| 39 "G0 X%.4f Y%.4f F%s" % (x, y, self.travel_speed) | |
| 40 ) | |
| 41 | |
| 42 def engrave(self, x, y): | |
| 43 x, y = self._dimensions(x, y) | |
| 44 if self.e_factor > 0: | |
| 45 self.dist += abs(math.hypot(x - self.dist_start[0], y - self.dist_start[1])) | |
| 46 e = "E%.4f" % (self.e_factor * self.dist) | |
| 47 self.dist_start = (x, y) | |
| 48 else: | |
| 49 e = "" | |
| 50 self.lines.append( | |
| 51 "G1 X%.4f Y%.4f %s F%s" % (x, y, e, self.engrave_speed) | |
| 52 ) | |
| 53 | |
| 54 | |
| 55 def write(self, filename): | |
| 56 # write gcode file | |
| 57 fout = open(filename, "w") | |
| 58 | |
| 59 fout.write(""" | |
| 60 ; Filename: %s | |
| 61 ; GCode generated by bitplotter one-night-quick-hack script (marlin code flavour) | |
| 62 | |
| 63 G21 ; Metric | |
| 64 ; We assume Z is in focus height and laser head is focus at bottom left of image! | |
| 65 G92 X0 Y0 E0 ; set zero position - new origin | |
| 66 G90 ; absolute positioning | |
| 67 M82 ; Set extruder (laser) to absolute positioning | |
| 68 M201 X1000 Y1000 E500 ; Set acceleration | |
| 69 M203 X1000 Y1000 Z4 E10 ; Set max feedrate | |
| 70 M209 S0 ; disable firmware retraction, we dont want to burn holes... | |
| 71 M302 ; Allow cold extrudes - doesnt matter because we hack the extruder physically off with the M571 E mod | |
| 72 M571 S1 E1 ; Activate Laser output on extrusion, but block real motor movement! | |
| 73 G0 X0 Y0 F%.1f ; Set moving speed | |
| 74 G1 X0 Y0 F%.1f ; Set engrave speed | |
| 75 | |
| 76 """ % (filename, self.travel_speed, self.engrave_speed)) | |
| 77 | |
| 78 for g in self.lines: | |
| 79 fout.write(g + "\n") | |
| 80 fout.close() |
