query.py

# GEO1000 - Assignment 3
# Authors:
# Studentnumbers:

from reader import read
from geometry import Rectangle, Circle, Point
from os.path import basename


def parse(geom_str):
    """Parse a string into a shape object (Point, Circle, or Rectangle)
    # 输入的啥，返回输入点的类型
    Formats that can be given:
    p <px> <py>
    c <cx> <cy> <r>
    r <llx> <lly> <urx> <ury>
    
    Returns - Point, Circle, or Rectangle
    """
    pass


def print_statistics(result):
    """Prints statistics for the resulting list of Points of a query
    
    * Number of points overlapping (i.e. number of points in the list)
    * The leftmost point and its identity given by the id function
    * The rightmost point and its identity given by the id function
    
    Returns - None
    """
    pass


def print_help():
    """Prints a help message to the user, what can be done with the program.
    """
    helptxt = """
Commands available:
-------------------
General:
    help
    quit

Reading points in a structure, defining how many strips should be used:
    open <filenm> into <number_of_strips>

Querying:
    with a point:     p <px> <py>
    with a circle:    c <cx> <cy> <radius>
    with a rectangle: r <llx> <lly> <urx> <ury>"""
    print(helptxt)

# =============================================================================
# Below are some commands that you may use to test your codes:
# open points2.txt into 5
# p 5.0 5.0
# c 10.0 10.0 1.0
# r 2.0 2.0 8.0 4.0
# =============================================================================
def main():
    """The main function of this program.
    """
    structure = None
    print("Welcome to {0}.".format(basename(__file__)))
    print("=" * 76)
    print_help()
    while True:
        in_str = input("your command>>>\n").lower()
        if in_str.startswith("quit"):#判断用户输入的字符串0是否以quit开始
            print("Bye, bye.")
            return
        elif in_str.startswith("help"):
            print_help()
        elif in_str.startswith("open"):
            filenm, nstrips = in_str.replace("open ", "").split(" into ")
            structure = read(filenm, int(nstrips))
            structure.print_strip_statistics()
        elif in_str.startswith("p") or in_str.startswith("c") or in_str.startswith("r"):
            if structure is None:
                print("No points read yet, open a file first!")
            else:
                print_statistics(structure.query(parse(in_str)))


if __name__ == "__main__":
    main()