Program using Python.
This program will draw a user-defined grid on the screen. When run the program will prompt the user for a positive (not 0) number to use for the grid spacing. Make sure to provide a reasonable default, and reasonable max value.
#!/usr/bin/python import Tkinter import turtle def draw(grid_spacing): grid_spacing = int(grid_spacing) # User defined grid spacing grid_window = turtle.Screen() # Turtle screen grid_window.title('Grid') # Getting screen width and height windowWidth = grid_window.window_width() windowHeight = grid_window.window_height() if not grid_spacing > 0 and windowHeight / grid_spacing < 2: # Validating grid_spacing = 20 # Setting coordinates for window turtle.setworldcoordinates(-1, -1, windowWidth, windowHeight) grid_turtle = turtle.Turtle() # turtle height_of_grid = 0 width_of_grid = 0 # Calculating total width of the grids for i in range(0, windowWidth - grid_spacing, grid_spacing): width_of_grid += grid_spacing # Drawing lines horizontally for i in range(0, windowHeight - grid_spacing, grid_spacing * 2): """In each iteration, the turtle draws a line from left to right and then draws the next line from right to left and stops at the position to draw the third line from left to right again""" grid_turtle.forward(width_of_grid) # Drawing from left to right grid_turtle.left(90) # Turning left grid_turtle.forward(grid_spacing) # Moving spacing distance upwards grid_turtle.left(90) # Again turning left grid_turtle.forward(width_of_grid) # Drawing 2nd line from right to left height_of_grid += grid_spacing # Calculating grid's total height """Checking so that turtle stops at the boundary and don't move upwards crossing the boundary.""" if grid_turtle.distance(0, windowHeight) > grid_spacing: # Drawing vertical line of spacing length after second line grid_turtle.right(90) grid_turtle.forward(grid_spacing) grid_turtle.right(90) height_of_grid += grid_spacing # Drawing vertical lines grid_turtle.left(90) for i in range(0, width_of_grid + grid_spacing, grid_spacing * 2): """In each iteration, turtle draws a line from top to bottom and then moves it's left to maintain grid distance and then draws the next line from bottom to top and then moves it's right again to maintain grid distance for next line.""" grid_turtle.forward(height_of_grid) # Moving downwards # Checking so that turtle does not cross boundary from the bottom portion if grid_turtle.distance(width_of_grid, 0) >= grid_spacing - 1: grid_turtle.left(90) grid_turtle.forward(grid_spacing) grid_turtle.left(90) grid_turtle.forward(height_of_grid) # Checking do that turtle does not cross boundary from the top line if grid_turtle.distance(width_of_grid, height_of_grid) > 1: grid_turtle.right(90) grid_turtle.forward(grid_spacing) grid_turtle.right(90) turtle.mainloop() def main(): main_window = Tkinter.Tk() # Creating main window main_window.title("Grid") user_prompt = Tkinter.Label(main_window, text='Enter grid spacing:') # Creating label user_prompt.pack() # Placing on main_window text_field = Tkinter.Entry(main_window, text="") # Creating text field text_field.pack() # Creating buttons # command binds a button to a function which will get invoked on click buttonOk = Tkinter.Button(main_window, text='OK', command=lambda: draw(text_field.get())) buttonOk.pack(side='left', fill='both', expand=True) buttonCancel = Tkinter.Button(main_window, text='Cancel', command=lambda: main_window.quit()) buttonCancel.pack(side='right', fill='both', expand=True) main_window.mainloop() # Running the application if __name__ == '__main__': main()
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Program using Python. This program will draw a user-defined grid on the screen. When run the...
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