#
# Name:           create_a_grid.py
# Description:    Script that creates instructions to
#                 generate a grid of closed polylines
#                 based on a larger rectangle.
# Author:         Mike Warren
# Date Created:   10/10/2013
# Last Modified:  10/11/2013
#
# gather rectangle parameters
width = float(raw_input("Enter rectangle width: "))
height = float(raw_input("Enter rectangle height: "))
columns = int(raw_input("Enter number of columns: "))
rows = int(raw_input("Enter number of rows: "))

# calculate grid dimensions
grid_width = width / columns
grid_height = height / rows

# user feedback
print "\nOverall width = " + str(width)
print "Overall height = " + str(height)
print "Generate " + str(columns) + " columns"
print "Generate " + str(rows) + " rows"
print "\nColumn width = " + str(float(width / columns))
print "Row height = " + str(float(height / rows))
print "Number of grids = " + str(columns * rows)

# create two new lists based on provided input
xlist = [] # empty list
xcount = 0
while xcount <= columns:
    xlist.append(xcount * grid_width)
    xcount += 1
ylist = []
ycount = 0
while ycount <= rows:
    ylist.append(ycount * grid_height)
    ycount += 1

# user feedback
print "\nX list: " + str(xlist)
print "Y list: " + str(ylist)
print "\n"

# create a set of coordinates using the x and y lists
# for the lower-left corners
y_origin = 0
while y_origin < (len(ylist)-1): # length-1 since 1st index is 0
    x_origin = 0
    while x_origin < (len(xlist)-1):
        print "PLINE" # to invoke an AutoCAD function
        print str(xlist[x_origin]) + "," + \
              str(ylist[y_origin])                     # LL Corner
        print str(xlist[x_origin] + grid_width) + \
              "," + str(ylist[y_origin])               # LR Corner
        print str(xlist[x_origin] + grid_width) + \
              "," + str(ylist[y_origin] + grid_height) # UR Corner
        print str(xlist[x_origin]) + "," + \
              str(ylist[y_origin] + grid_height)       # UL Corner
        print "C" # force closure of the polyline
        x_origin += 1
    y_origin += 1

print "\nDone!!"

# display final instructions
print "\n1. Highlight from the first 'PLINE' to the last 'C'"
print "2. Paste the contents into Notepad"
print "3. Save the file with a .scr extension"
print "4. Run it in AutoCAD using the SCRIPT command"
print "5. Move the resulting grid of closed polylines if necessary\n"