Mercurial > hg-public > lasercut-scripts / changeset

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/svg2gcode/autobot.svg	Sat Nov 07 13:37:23 2015 +0100
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
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+<g id="surface1">
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+</svg>

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/svg2gcode/gcode.py	Sat Nov 07 13:37:23 2015 +0100
@@ -0,0 +1,80 @@
+import math
+
+INCH = 25.4 # mm
+
+class Gcode(object):
+    def __init__(self, bbox=None, scale=1.0, travel_speed=20, engrave_speed=20):
+        self.dpi = 300
+        self.e_factor = 0.1
+
+        self.mm_pixel = round(INCH / self.dpi, 4)
+        self.steps_pixel = self.mm_pixel * 80 # mine is 80 steps/mm on XY
+        print "Resolution is %f mm per pixel" % self.mm_pixel
+        if self.steps_pixel <= 5:
+            print "Warning: Steps per pixel (needs to be > 5, otherwise marlin joins lines): %f" % self.steps_pixel
+
+        self.lines = []
+        self.dist_start = (0, 0)
+        self.dist = 0.0
+
+        self.scale = scale
+        self.travel_speed = travel_speed * 60
+        self.engrave_speed = engrave_speed * 60
+
+    def _dimensions(self, x, y):
+        x = self.mm_pixel * x
+        y = self.mm_pixel * y
+        if self.scale != 1.0:
+            x = x * self.scale
+            y = y * self.scale
+        return (x, y)
+
+    def move(self, x, y):
+        x, y = self._dimensions(x, y)
+        if self.e_factor > 0:
+            self.dist_start = (x, y)
+            self.dist = 0.0
+            self.lines.append("G92 E0") # reset extruder length
+        self.lines.append(
+            "G0 X%.4f Y%.4f F%s" % (x, y, self.travel_speed)
+        )
+
+    def engrave(self, x, y):
+        x, y = self._dimensions(x, y)
+        if self.e_factor > 0:
+            self.dist += abs(math.hypot(x - self.dist_start[0], y - self.dist_start[1]))
+            e = "E%.4f" % (self.e_factor * self.dist)
+            self.dist_start = (x, y)
+        else:
+            e = ""
+        self.lines.append(
+            "G1 X%.4f Y%.4f %s F%s" % (x, y, e, self.engrave_speed)
+        )
+
+
+    def write(self, filename):
+        # write gcode file
+        fout = open(filename, "w")
+
+        fout.write("""
+; Filename: %s
+; GCode generated by bitplotter one-night-quick-hack script (marlin code flavour)
+
+G21 ; Metric
+; We assume Z is in focus height and laser head is focus at bottom left of image!
+G92 X0 Y0 E0 ; set zero position - new origin
+G90 ; absolute positioning
+M82 ; Set extruder (laser) to absolute positioning
+M201 X1000 Y1000 E500 ; Set acceleration
+M203 X1000 Y1000 Z4 E10 ; Set max feedrate
+M209 S0 ; disable firmware retraction, we dont want to burn holes...
+M302 ; Allow cold extrudes - doesnt matter because we hack the extruder physically off with the M571 E mod
+M571 S1 E1 ; Activate Laser output on extrusion, but block real motor movement!
+G0 X0 Y0 F%.1f ; Set moving speed
+G1 X0 Y0 F%.1f ; Set engrave speed
+
+""" % (filename, self.travel_speed, self.engrave_speed))
+
+        for g in self.lines:
+            fout.write(g + "\n")
+        fout.close()

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/svg2gcode/svg2gcode.py	Sat Nov 07 13:37:23 2015 +0100
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+import svg, sys
+from gcode import Gcode
+from optparse import OptionParser
+
+parser = OptionParser()
+parser.add_option("-f", "--file", dest="filename", default=None,
+                  help="Load SVG file", metavar="FILE")
+parser.add_option("-s", "--scale",
+                  dest="scale", type="float", default=1.0,
+                  help="set scale factor (default 1.0)")
+parser.add_option("-e", "",
+                  dest="engrave_speed", type="float", default=20,
+                  help="engrave speed mm/sec (default 20)")
+parser.add_option("-t", "",
+                  dest="travel_speed", type="float", default=130,
+                  help="travel speed mm/sec (default 130)")
+
+
+(options, args) = parser.parse_args()
+
+
+if not options.filename:
+    print "no filename given!"
+    sys.exit(1)
+
+gcode = Gcode(scale=options.scale, travel_speed=options.travel_speed, engrave_speed=options.engrave_speed)
+
+im = svg.parse(options.filename)
+b1, b2 = im.bbox()
+width, height = b2.coord()
+print "Original dimension: %.2f x %.2f" % (width, height)
+width *= gcode.mm_pixel * options.scale
+height *= gcode.mm_pixel * options.scale
+print "Print dimension: %.2fmm x %.2fmm" % (width, height)
+
+def normalize(coord):
+    x = coord[0]
+    y = coord[1]
+    # flip y
+    y = (b2.coord()[1] - y)
+    return (x, y)
+
+data = im.flatten()
+for d in data:
+    if hasattr(d, "segments"):
+        for l in d.segments(1):
+            x, y = normalize(l[0].coord())
+            gcode.move(x, y)
+            for pt in l[1:]:
+                x, y = normalize(pt.coord())
+                gcode.engrave(x, y)
+
+# write gcode file
+gcode.write(options.filename + ".g")