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flut.py
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flut.py
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from flask import Flask, request
from flask_api import status
import axi
import gocept.cache.method
import json
import time
# do not change that, as this are the bounds of the plotter
MAX_STEPS_X, MAX_STEPS_Y = MAX_STEPS = (11, 8.5)
# configuration, should be the same aspect as the values above
MAX_GRID_X, MAX_GRID_Y = MAX_GRID = (104, 72)
# safetybelt
MAX_X = MAX_GRID_X-1
MAX_Y = MAX_GRID_Y-4
GRIDSIZE_X = MAX_STEPS_X / MAX_GRID_X
GRIDSIZE_Y = MAX_STEPS_Y / MAX_GRID_Y
blocked = False
path = []
d = None
def save_field(x,y,i):
with open('drawing','a') as savefile:
savefile.write(f"{x},{y},{i}\n")
def check_field(x,y):
with open('drawing', 'r') as savefile:
lines = savefile.readlines()
koords = []
for line in lines:
kx,ky,i = line.split(',')
koords.append((kx,ky))
if (str(x),str(y)) in koords:
return True
return False
def pixel(intensity):
intensity = intensity + 2
stepping = 10/intensity
path = []
elem=0
for x in range(intensity+1):
elem+=1
path.append(((x*stepping),10*(elem%2)))
elem+=1
for x in range(intensity+1):
elem+=1
path.append((10*(elem%2),(x*stepping)))
return path
def steps_x(grid_x):
return GRIDSIZE_X * grid_x
def steps_y(grid_y):
return GRIDSIZE_Y * grid_y
def init():
global d
global path
d = axi.Device(max_velocity=7, jog_max_velocity=11)
d.pen_up()
d.enable_motors()
time.sleep(0.2)
path.append((0, 0))
d.disable_motors()
def goto_point_scaled(point, factor=1, deltax=0, deltay=0):
global d
global path
x, y = point
dx = (steps_x(x) / factor) + deltax
dy = (steps_y(y) / factor) + deltay
path.append((dx, dy))
return (dx, dy)
def draw_in_position(intensity, pos):
global d
global path
dx, dy = pos
points = pixel(intensity)
x,y = points.pop()
last_point = goto_point_scaled((x,y), 10.0, dx, dy)
d.run_path(path)
d.wait()
path = [last_point]
d.pen_down()
while points:
x,y = points.pop()
point = goto_point_scaled((x,y), 10.0, dx, dy)
d.run_path(path)
d.wait()
d.pen_up()
return point
def draw(data):
global d
global path
global blocked
try:
x = data.get('x')
y = data.get('y')
intensity = int(data.get('intensity'))
x = int(x)
y = int(y)
if x>MAX_X or y>MAX_Y:
return False, f"x,y out of bounds. Maximum is {MAX_X},{MAX_Y}."
if (intensity > 7) and (intensity != 23):
return False, "Max intensity: 7"
if x<0 or y<0 or intensity<0:
return False, "Negative values are not allowed!"
except (TypeError, ValueError):
return False, "Parse error."
if check_field(x,y):
return False, "Field already drawn in this session."
if blocked:
return False, "Damn. Now plotter is blocked."
blocked = True
save_field(x,y,intensity)
if intensity == 23:
blocked = False
return True, "Success"
d.enable_motors()
last_point = goto_point_scaled((x,y))
d.run_path(path)
d.wait()
path=[last_point]
dx, dy = last_point
last_point = draw_in_position(intensity, (dx,dy))
path=[last_point]
#
# uncomment the following for returning to home position
# after each point
#
#last_point = goto_point_scaled((x,y))
#d.run_path(path)
#d.wait()
#path = [last_point]
d.disable_motors()
blocked = False
return True, "Success"
# flask stuff
app = Flask("plotterflut")
def to_dict(args):
outdict = {}
for key, val in args.items():
outdict[key] = val
return outdict
@app.route('/plotterflut/api')
def index():
global blocked
if blocked:
return "Plotter busy.", status.HTTP_409_CONFLICT
data = to_dict(request.args)
success, msg = draw(data)
if success:
return msg
else:
return msg, status.HTTP_402_PAYMENT_REQUIRED
@app.route('/plotterflut/home')
def home():
global blocked
global d
global path
if path == [(0,0)]:
return "Already homed."
if blocked:
return "Plotter busy.", status.HTTP_409_CONFLICT
blocked = True
d.enable_motors()
last_point = goto_point_scaled((0,0))
d.run_path(path)
d.wait()
d.disable_motors()
path=[last_point]
blocked = False
return "OK"
@gocept.cache.method.Memoize(5)
def load_data():
with open('drawing', 'r') as savefile:
lines = savefile.readlines()
data = []
for line in lines:
x,y,i = line.split(',')
data.append({"x":x,"y":y,"i":i.strip()})
return json.dumps(data)
@app.route('/plotterflut/data')
def data():
return load_data()
init()