ILDA.py

"""
ILDA Header Format:
  1-4:  "ILDA"
  5-7: 	Reserved
    8: 	Format Code
 9-16: 	Frame or Color Palette Name
17-24:  Company Name
25-26: 	Number of Records
27-28: 	Frame or Color Palette Number
29-30:  Total Frames or 0
   31:	Projector Number
   32:	Reserved	 
"""
		
import struct
import matplotlib.pyplot as plt

FORMAT_HEADER = struct.Struct('>7sB8s8s3H2B')

FORMAT_0 = struct.Struct('>HHHbb')
FORMAT_1 = ''
FORMAT_3 = ''
FORMAT_5 = ''

EXTREME_REAR = -32768
EXTREME_FRONT = 32767

RECORD_FIELD_NAMES = {
	'0': ['x', 'y', 'z', 'status_code', 'color_index']
}

class ILDA_FILE:
	
	records = []
	
	def __init__(self, file_src):
		f = open(file_src, 'rb')
		
		raw_data = f.read(32)
		print(raw_data)
		# unpack meta data
		data = FORMAT_HEADER.unpack(raw_data)

		self.format_code = str(data[1])
		self.instance_name = data[2].decode('ascii')
		self.company_name = data[3].decode('ascii')
		self.n_records = data[4]
		self.instance_number = data[5]
		self.total_frames = data[6]
		self.projector_number = data[7]

		# add each data record (frame) one by one
		field_names = RECORD_FIELD_NAMES[self.format_code]
		data_records = []
		for _ in range(0, self.n_records):
			raw_data = FORMAT_0.unpack(f.read(8))
			record = dict(zip(field_names, raw_data))
			plt.scatter(record['x'], record['y'], s=3)
			data_records.append(record)
		
		#### try displaying points
		plt.show()
			
alice_data = ILDA_FILE('data/alice.ild')