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cuttingOpt.py
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cuttingOpt.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sat Jul 8 20:04:31 2017
@author: josemanuel
"""
import pandas as pd
import numpy as np
import turtle as ttl
class Model(object):
def __init__(self,W=0,H=0,n_sheets=0):
self.sheets=pd.DataFrame(columns=['Free_Width','Free_Height','lx','rx','y','items','checked_item'])
self.items=pd.DataFrame(columns=['Width','Height','id','sheet','x','y'])
self.W=W
self.H=H
self.n_sheets=n_sheets
def config_sheet(self, W, H):
self.W=W
self.H=H
def set_sheets_df(self, W, H, n_sheets):
self.W=W
self.H=H
self.n_sheets=n_sheets
#self.sheets=pd.DataFrame(columns=['Width','Height','x','y','lx','ly','items'])
for x in range(int(n_sheets)):
sheet_pd=pd.DataFrame([[self.W,self.H,0,self.W,0,[],[],x+1]],columns=['Free_Width','Free_Height','lx','rx','y','items','checked_item','index'])
sheet_new=sheet_pd.set_index(keys='index')
self.sheets=self.sheets.append(sheet_new)
def get_info_sheets(self):
print("# of sheets: %d" % self.n_sheets)
print("Sheet dimension: Width - %d ; Height - %d" % (self.W,self.H))
def get_info_items(self):
print(self.items)
def add_item(self,element):
"""Input: list of the shape - (Width, Height, id) """
index=self.items.shape[0]+1
sheet=0
starting_point=0
element[0].append(sheet)
element[0].append(starting_point)
element[0].append(starting_point)
element[0].append(index)
element_pd=pd.DataFrame(element, columns=['Width','Height','id','sheet','x','y','index'])
element_new=element_pd.set_index(keys='index')
self.items=self.items.append(element_new)
def add_sheet(self):
sheet_pd=pd.DataFrame([[self.W,self.H,0,self.W,0,[],[],self.n_sheets+1]],columns=['Free_Width','Free_Height','lx','rx','y','items','checked_item','index'])
sheet_new=sheet_pd.set_index(keys='index')
self.sheets=self.sheets.append(sheet_new)
self.n_sheets=self.n_sheets+1
def sort_items(self):
#self.items['WidthxHeight']=self.items['Width']*self.items['Height']
self.items=self.items.sort_values('Height',ascending=False)
def compute_lb(self):
self.items['WidthxHeight']=self.items['Width']*self.items['Height']
return round(self.items['WidthxHeight'].sum()/(self.W*self.H),0)
def draw_solution(self):
i=0
pendict=dict()
pendict['shown']=False
pendict['speed']=10
ttl.pen(pen=pendict)
ttl.setup( width = 700, height = 250, startx = None, starty = None)
for x in range(1,int(self.n_sheets+1)):
ttl.penup()
ttl.setpos(-100+i*self.W*15,-100)
ttl.pendown()
ttl.setheading(0)
ttl.forward(self.W*10)
ttl.left(90)
ttl.forward(self.H*10)
ttl.left(90)
ttl.forward(self.W*10)
ttl.left(90)
ttl.forward(self.H*10)
items=self.items[self.items['sheet']==x]
for index, item in items.iterrows():
ttl.penup()
ttl.setpos(-100+item['x']*10+i*self.W*15,-100+item['y']*10)
ttl.pendown()
ttl.color("black", "red")
ttl.begin_fill()
ttl.setheading(0)
ttl.forward(item['Width']*10)
ttl.left(90)
ttl.forward(item['Height']*10)
ttl.left(90)
ttl.forward(item['Width']*10)
ttl.left(90)
ttl.forward(item['Height']*10)
ttl.end_fill()
i=i+1
ttl.done()
def find_minsheets(self):
self.sort_items()
n_used_sheets=self.compute_lb()
self.set_sheets_df(self.W, self.H, n_used_sheets)
items_not_stored=self.items.shape[0]
items_pd = self.items.copy()
items_to_delete=[]
self.closed_sheets=pd.DataFrame(columns=['Free_Width','Free_Height','lx','rx','y','items','checked_item'])
from_left_right=1
#Phase 1 ---------
items_pd = self.items.copy()
items_pd = items_pd[~items_pd['id'].isin(items_to_delete)]
for index_sheets, sheet in self.sheets.iterrows():
for index_items, item in items_pd.iterrows():
if item['Width'] <= sheet['Free_Width'] and item['Height'] <= sheet['Free_Height']:
items_not_stored = items_not_stored - 1
items_to_delete.append(item['id'])
if from_left_right==1:
self.items['x'][index_items] = sheet['lx']
self.items['y'][index_items] = sheet['y']
self.items['sheet'][index_items] = index_sheets
self.sheets['Free_Width'][index_sheets]= sheet['Free_Width'] - item ['Width']
self.sheets['lx'][index_sheets]= sheet['lx'] + item['Width']
self.sheets['items'][index_sheets].append(item['id'])
else:
self.items['x'][index_items] = sheet['rx']-item ['Width']
self.items['y'][index_items] = sheet['y']
self.items['sheet'][index_items] = index_sheets
self.sheets['Free_Width'][index_sheets]= sheet['Free_Width'] - item ['Width']
self.sheets['rx'][index_sheets]= sheet['rx'] - item['Width']
self.sheets['items'][index_sheets].append(item['id'])
items_pd = items_pd[~items_pd['id'].isin(items_to_delete)] #Update df
#Phase 2---------
while items_not_stored > 0:
n_fail=0
while items_not_stored>0 and n_fail<20:
for index_sheets, sheet in self.sheets.iterrows(): #For each sheet
pd_temp=self.items[self.items['id'].isin(self.sheets['items'][index_sheets])] #get the items in sheet
pd_temp['total_height']=pd_temp['y']+pd_temp['Height'] #Calcualte total height for each item
pd_temp=pd_temp[~pd_temp['id'].isin(sheet['checked_item'])] #Drop elements that were checked
#If all items in sheet have the same hegiht
if all(x == pd_temp['total_height'].iloc[0] for x in pd_temp['total_height']) and pd_temp.shape[0] > 1:
min_h=items_pd['Height'][items_pd['id'].argmin()]
min_w=items_pd['Width'][items_pd['id'].argmin()]
#Checked all items with same height
for index_checked_items, row in pd_temp.iterrows():
self.sheets['checked_item'][index_sheets].append(row['id'])
ly=min(pd_temp['total_height'])
if (self.sheets['Free_Height'][index_sheets]< min_h or self.sheets['Free_Width'][index_sheets]< min_w )and n_fail >n_used_sheets:
self.closed_sheets=self.closed_sheets.append(self.sheets.loc[[index_sheets]])
self.sheets=self.sheets.drop([index_sheets])
else:
self.sheets['y'][index_sheets]=ly
self.sheets['Free_Height'][index_sheets]=self.H-self.sheets['y'][index_sheets]
if self.sheets['Free_Height'][index_sheets]!=0:
if from_left_right==1:
self.sheets['rx'][index_sheets]=0
self.sheets['lx'][index_sheets]=0
self.sheets['Free_Width'][index_sheets]=self.W
else:
self.sheets['lx'][index_sheets]=0
self.sheets['rx'][index_sheets]=self.W
self.sheets['Free_Width'][index_sheets]=self.W
#If items in sheet have different height
elif pd_temp.shape[0] > 0:
ly=min(pd_temp['total_height'])
self.sheets['checked_item'][index_sheets].append(pd_temp['id'][pd_temp['total_height'].argmin()])
item_id=pd_temp['id'][pd_temp['total_height'].argmin()]
lx=pd_temp['Width'][pd_temp['id']==item_id].values[0]
min_h=items_pd['Height'][items_pd['id'].argmin()]
min_w=items_pd['Width'][items_pd['id'].argmin()]
if self.sheets['Free_Height'][index_sheets]< min_h or self.sheets['Free_Width'][index_sheets]< min_w and n_fail >n_used_sheets:
self.closed_sheets=self.closed_sheets.append(self.sheets.loc[[index_sheets]])
self.sheets=self.sheets.drop([index_sheets])
else:
if from_left_right==1:
self.sheets['y'][index_sheets]=ly
self.sheets['lx'][index_sheets]=self.sheets['lx'][index_sheets]-lx
self.sheets['Free_Width'][index_sheets]=self.sheets['Free_Width'][index_sheets]+lx
self.sheets['Free_Height'][index_sheets]=self.H-self.sheets['y'][index_sheets]
else:
self.sheets['y'][index_sheets]=ly
self.sheets['lx'][index_sheets]=self.sheets['lx'][index_sheets]-lx
self.sheets['rx'][index_sheets]=self.W
self.sheets['Free_Width'][index_sheets]=self.sheets['Free_Width'][index_sheets]+lx
self.sheets['Free_Height'][index_sheets]=self.H-self.sheets['y'][index_sheets]
items_pd = self.items.copy()
items_pd = items_pd[~items_pd['id'].isin(items_to_delete)]
for index_sheets, sheet in self.sheets.iterrows():
for index_items, item in items_pd.iterrows():
if item['Width'] <= sheet['Free_Width'] and item['Height'] <= sheet['Free_Height']:
items_not_stored = items_not_stored - 1
items_to_delete.append(item['id'])
if from_left_right==1:
self.items['x'][index_items] = sheet['lx']
self.items['y'][index_items] = sheet['y']
self.items['sheet'][index_items] = index_sheets
self.sheets['Free_Width'][index_sheets]= sheet['Free_Width'] - item ['Width']
self.sheets['lx'][index_sheets]= sheet['lx'] + item['Width']
self.sheets['items'][index_sheets].append(item['id'])
else:
self.items['x'][index_items] = sheet['rx']-item ['Width']
self.items['y'][index_items] = sheet['y']
self.items['sheet'][index_items] = index_sheets
self.sheets['Free_Width'][index_sheets]= sheet['Free_Width'] - item ['Width']
self.sheets['rx'][index_sheets]= sheet['rx'] - item['Width']
self.sheets['items'][index_sheets].append(item['id'])
items_pd = items_pd[~items_pd['id'].isin(items_to_delete)] #Update df
from_left_right=from_left_right*-1
n_fail=n_fail+1
if items_not_stored != 0 :
self.add_sheet()
n_used_sheets=n_used_sheets+1
return n_used_sheets