at-tami/gerber/gerbmerge/bin/tilesearch2.py

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2015-07-23 02:43:01 +03:00
#!/usr/bin/env python
"""Tile search using random placement and evaluation. Works surprisingly well.
--------------------------------------------------------------------
This program is licensed under the GNU General Public License (GPL)
Version 3. See http://www.fsf.org for details of the license.
Rugged Circuits LLC
http://ruggedcircuits.com/gerbmerge
"""
import sys
import time
import random
import config
import tiling
import tilesearch1
import gerbmerge
_StartTime = 0.0 # Start time of tiling
_CkpointTime = 0.0 # Next time to print stats
_Placements = 0L # Number of placements attempted
_TBestTiling = None # Best tiling so far
_TBestScore = float(sys.maxint) # Smallest area so far
def printTilingStats():
global _CkpointTime
_CkpointTime = time.time() + 3
if _TBestTiling:
area = _TBestTiling.area()
utilization = _TBestTiling.usedArea() / area * 100.0
else:
area = 999999.0
utilization = 0.0
print "\r %ld placements / Smallest area: %.1f sq. in. / Best utilization: %.1f%%" % \
(_Placements, area, utilization),
if gerbmerge.GUI is not None:
sys.stdout.flush()
def _tile_search2(Jobs, X, Y, cfg=config.Config):
global _CkpointTime, _Placements, _TBestTiling, _TBestScore
r = random.Random()
N = len(Jobs)
# M is the number of jobs that will be placed randomly.
# N-M is the number of jobs that will be searched exhaustively.
M = N - config.RandomSearchExhaustiveJobs
M = max(M,0)
xspacing = cfg['xspacing']
yspacing = cfg['yspacing']
# Must escape with Ctrl-C
while 1:
T = tiling.Tiling(X,Y)
joborder = r.sample(range(N), N)
minInletSize = tiling.minDimension(Jobs)
for ix in joborder[:M]:
Xdim,Ydim,job,rjob = Jobs[ix]
T.removeInlets(minInletSize)
if r.choice([0,1]):
addpoints = T.validAddPoints(Xdim+xspacing,Ydim+yspacing)
if not addpoints:
break
pt = r.choice(addpoints)
T.addJob(pt, Xdim+xspacing, Ydim+yspacing, job)
else:
addpoints = T.validAddPoints(Ydim+xspacing,Xdim+yspacing)
if not addpoints:
break
pt = r.choice(addpoints)
T.addJob(pt, Ydim+xspacing, Xdim+yspacing, rjob)
else:
# Do exhaustive search on remaining jobs
if N-M:
remainingJobs = []
for ix in joborder[M:]:
remainingJobs.append(Jobs[ix])
tilesearch1.initialize(0)
tilesearch1._tile_search1(remainingJobs, T, 1)
T = tilesearch1.bestTiling()
if T:
score = T.area()
if score < _TBestScore:
_TBestTiling,_TBestScore = T,score
elif score == _TBestScore:
if T.corners() < _TBestTiling.corners():
_TBestTiling,_TBestScore = T,score
_Placements += 1
# If we've been at this for 3 seconds, print some status information
if time.time() > _CkpointTime:
printTilingStats()
# Check for timeout
if (config.SearchTimeout > 0) and ((time.time() - _StartTime) > config.SearchTimeout):
raise KeyboardInterrupt
gerbmerge.updateGUI("Performing automatic layout...")
# end while 1
def tile_search2(Jobs, X, Y):
"""Wrapper around _tile_search2 to handle keyboard interrupt, etc."""
global _StartTime, _CkpointTime, _Placements, _TBestTiling, _TBestScore
_StartTime = time.time()
_CkpointTime = _StartTime + 3
_Placements = 0L
_TBestTiling = None
_TBestScore = float(sys.maxint)
print '='*70
print "Starting random placement trials. You must press Ctrl-C to"
print "stop the process and use the best placement so far."
print "Estimated maximum possible utilization is %.1f%%." % (tiling.maxUtilization(Jobs)*100)
try:
_tile_search2(Jobs, X, Y)
printTilingStats()
print
except KeyboardInterrupt:
printTilingStats()
print
print "Interrupted."
computeTime = time.time() - _StartTime
print "Computed %ld placements in %d seconds / %.1f placements/second" % (_Placements, computeTime, _Placements/computeTime)
print '='*70
return _TBestTiling