Lasercutter test structure generator

teststructure.py

import math

def gcodeRectangle(center, size, power, speedtravel, speedcut):
	# Disable laser, travel to center
	res = "M42 P4 S0\n"
	res = res + "G00 X{0:4.2f} Y{1:4.2f} F{2}\n".format(center[0], center[1], speedtravel)

	# Travel to first corner
	res = res + "G00 X{0:4.2f} Y{1:4.2f} F{2}\n".format(center[0] - size[0]/2, center[1] -size[1]/2, speedtravel)

	# Enable laser
	res = res + "M42 P4 S{}\n".format(power)

	# Travel around rectangle ...
	res = res + "G01 X{0:4.2f} Y{1:4.2f} F{2}\n".format(center[0] + size[0]/2, center[1] - size[1]/2, speedcut)
	res = res + "G01 X{0:4.2f} Y{1:4.2f} F{2}\n".format(center[0] + size[0]/2, center[1] + size[1]/2, speedcut)
	res = res + "G01 X{0:4.2f} Y{1:4.2f} F{2}\n".format(center[0] - size[0]/2, center[1] + size[1]/2, speedcut)
	res = res + "G01 X{0:4.2f} Y{1:4.2f} F{2}\n".format(center[0] - size[0]/2, center[1] - size[1]/2, speedcut)

	# Disable laser
	res = res + "M42 P4 S0\n"

	return res

def gcodePowerRectangles(center, sizeMax, steps, powerMin, powerMax, speedtravel, speedcut, nPasses = 1):
	stepSize = sizeMax / steps
	powerStep = (powerMax - powerMin) / steps

	res = ""

	for iRect in range(steps):
		curSize = [ stepSize * (iRect + 1), stepSize * (iRect + 1) ]
		curPower = math.floor(powerMin + iRect * (powerStep+1))

		res = res + gcodeRectangle(center, curSize, curPower, speedtravel, speedcut)

	if nPasses > 1:
		res2 = ""
		for iPass in range(nPasses):
			res2 = res2 + res
		return res2
	else:
		return res

def gcodePassPowerRectangles(areaX, areaY, passes, powersteps, powerMin, powerMax, speedtravel, speedcut):
	# First determine size of our rectangles (by fitting into the work area)...

	tryX = min(areaX, areaY)
	while True:
		nx = math.floor(areaX / tryX)
		ny = math.floor(areaY / tryX)
		nmax = nx * ny
		if nmax >= len(passes):
			break
		tryX = tryX - 1.0
		if tryX < 10.0:
			print("Cannot fit into work area in a useful way ...")
			sys.exit(0)

	print("; Size of single object: {}".format(tryX))

	sizeMax = tryX

	curX = -tryX/2.0
	curY = tryX / 2.0

	res = ""

	for iStep in range(len(passes)):
		curX = curX + tryX
		if curX > areaX:
			curX = tryX / 2.0
			curY = curY + tryX

		res = res + "; {} passes, center at ({}, {})\n".format(passes[iStep], curX, curY)
		res = res + gcodePowerRectangles([curX, curY], sizeMax, powersteps, powerMin, powerMax, speedtravel, speedcut, nPasses = passes[iStep])

	res = res + "G00 X0 Y0 F{0}\n".format(speedtravel)
	print(res)

gcodePassPowerRectangles(100, 100, [ 1, 10, 25, 50, 75, 100 ], 10, 25, 255, 3000, 300)