182 lines
5.8 KiB
Python
182 lines
5.8 KiB
Python
# adds support fro ARC commands via G2/G3
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#
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# Copyright (C) 2019 Aleksej Vasiljkovic <achmed21@gmail.com>
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#
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# function planArc() originates from https://github.com/MarlinFirmware/Marlin
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# Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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# uses the plan_arc function from marlin which does steps in mm rather then
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# in degrees. # Coordinates created by this are converted into G1 commands.
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#
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# note: only IJ version available
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import math
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import re
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class ArcSupport:
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def __init__(self, config):
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self.printer = config.get_printer()
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self.mm_per_arc_segment = config.getfloat('resolution', 1, above=0.0)
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self.gcode = self.printer.lookup_object('gcode')
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self.gcode.register_command("G2", self.cmd_G2, desc=self.cmd_G2_help)
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self.gcode.register_command("G3", self.cmd_G2, desc=self.cmd_G3_help)
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cmd_G2_help = "Counterclockwise rotation move"
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cmd_G3_help = "Clockwise rotaion move"
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def cmd_G2(self, params):
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# set vars
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currentPos = self.gcode.get_status(None)['gcode_position']
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asX = params.get("X", None)
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asY = params.get("Y", None)
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asZ = params.get("Z", None)
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asR = float(params.get("R", 0.)) #radius
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asI = float(params.get("I", 0.))
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asJ = float(params.get("J", 0.))
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asE = float(params.get("E", 0.))
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asF = float(params.get("F", -1))
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# --------- health checks of code -----------
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if (asX is None or asY is None):
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raise self.gcode.error("g2/g3: Coords missing")
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elif asR == 0 and asI == 0 and asJ==0:
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raise self.gcode.error("g2/g3: neither R nor I and J given")
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elif asR > 0 and (asI !=0 or asJ!=0):
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raise self.gcode.error("g2/g3: R, I and J were given. Invalid")
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else: # -------- execute conversion -----------
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coords = []
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clockwise = params['#command'].lower().startswith("g2")
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asY = float(asY)
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asX = float(asX)
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# use radius
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# if asR > 0:
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# not sure if neccessary since R barely seems to be used
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# use IJK
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if asI != 0 or asJ!=0:
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coords = self.planArc(currentPos,
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[asX,asY,0.,0.],
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[asI, asJ],
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clockwise)
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###############################
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# converting coords into G1 codes (lazy aproch)
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if len(coords)>0:
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# build dict and call cmd_G1
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for coord in coords:
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g1_params = {'X': coord[0], 'Y': coord[1]}
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if asZ!=None:
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g1_params['Z']= float(asZ)
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if asE>0:
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g1_params['E']= float(asE)/len(coords)
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if asF>0:
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g1_params['F']= asF
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self.gcode.cmd_G1(g1_params)
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else:
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self.gcode.respond_info(
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"could not tranlate from '" + params['#original'] + "'")
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# function planArc() originates from marlin plan_arc()
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# https://github.com/MarlinFirmware/Marlin
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#
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# The arc is approximated by generating many small linear segments.
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# The length of each segment is configured in MM_PER_ARC_SEGMENT
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# Arcs smaller then this value, will be a Line only
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def planArc(
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self,
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currentPos,
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targetPos=[0.,0.,0.,0.],
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offset=[0.,0.],
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clockwise=False):
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# todo: sometimes produces full circles
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coords = []
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MM_PER_ARC_SEGMENT = self.mm_per_arc_segment
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X_AXIS = 0
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Y_AXIS = 1
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Z_AXIS = 2
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# Radius vector from center to current location
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r_P = offset[0]*-1
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r_Q = offset[1]*-1
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radius = math.hypot(r_P, r_Q)
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center_P = currentPos[X_AXIS] - r_P
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center_Q = currentPos[Y_AXIS] - r_Q
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rt_X = targetPos[X_AXIS] - center_P
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rt_Y = targetPos[Y_AXIS] - center_Q
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linear_travel = targetPos[Z_AXIS] - currentPos[Z_AXIS]
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angular_travel = math.atan2(r_P * rt_Y - r_Q * rt_X,
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r_P * rt_X + r_Q * rt_Y)
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if (angular_travel < 0): angular_travel+= math.radians(360)
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if (clockwise): angular_travel-= math.radians(360)
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# Make a circle if the angular rotation is 0
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# and the target is current position
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if (angular_travel == 0
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and currentPos[X_AXIS] == targetPos[X_AXIS]
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and currentPos[Y_AXIS] == targetPos[Y_AXIS]):
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angular_travel = math.radians(360)
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flat_mm = radius * angular_travel
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mm_of_travel = linear_travel
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if(mm_of_travel == linear_travel):
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mm_of_travel = math.hypot(flat_mm, linear_travel)
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else:
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mm_of_travel = math.abs(flat_mm)
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if (mm_of_travel < 0.001):
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return coords
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segments = int(math.floor(mm_of_travel / (MM_PER_ARC_SEGMENT)))
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if(segments<1):
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segments=1
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raw = [0.,0.,0.,0.]
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theta_per_segment = float(angular_travel / segments)
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linear_per_segment = float(linear_travel / segments)
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# Initialize the linear axis
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raw[Z_AXIS] = currentPos[Z_AXIS];
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for i in range(1,segments+1):
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cos_Ti = math.cos(i * theta_per_segment)
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sin_Ti = math.sin(i * theta_per_segment)
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r_P = -offset[0] * cos_Ti + offset[1] * sin_Ti
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r_Q = -offset[0] * sin_Ti - offset[1] * cos_Ti
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raw[X_AXIS] = center_P + r_P
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raw[Y_AXIS] = center_Q + r_Q
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raw[Z_AXIS] += linear_per_segment
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coords.append([raw[X_AXIS], raw[Y_AXIS], raw[Z_AXIS] ])
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return coords
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def load_config(config):
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return ArcSupport(config)
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