python: simple square grid

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Recently, I've been trying to figure out a 20 by 20 square grid. so far I've only figured out how to draw 4 no matter what I put as my # of. it would be greatly appreciated if someone can figure out my flaws in the code!

what I'm trying to achieve

my code

import turtle
turtle.hideturtle()
t = turtle.Turtle()
t.hideturtle()

def draw_square(t, size, num, angle):

for i in range(num):
    for x in range(4):
        turtle.forward(size)
        turtle.left(90)
    turtle.right(angle)

draw_square(t, 25, 4, 90)

Your code has a pair of nested loops. However, given the way you're drawing the grid, you really need three nested loops. Trying to figure out the least amount of code to get from where you are to where you want to be, I came up with the following:

from turtle import Screen, Turtle

def draw_square(turtle, size, num):
    for y in range(num):
        for x in range(num):
            for _ in range(4):
                turtle.forward(size)
                turtle.left(90)

            turtle.forward(size)

        parity = y % 2 == 0
        turn = turtle.left if parity else turtle.right

        turn(90)
        turtle.forward(size * 2 * parity)
        turn(90)

screen = Screen()

yertle = Turtle(visible=False)
yertle.speed('fastest')  # because I have no patience

draw_square(yertle, 25, 20)

screen.exitonclick()

This code is inefficient drawing-wise as the same lines get redrawn which is something to be avoided. My personal favorite solution to this problem is my Tholian Web approach using generators:

from turtle import Turtle, Screen

UNIT_SIZE, GRID_SQUARES = 25, 20

GRID_SIZE = GRID_SQUARES * UNIT_SIZE

def half_grid(turtle):
    speed = turtle.speed()

    for brick in range(GRID_SQUARES):
        direction = [turtle.right, turtle.left][brick % 2 == 1]

        for _ in range(0, GRID_SIZE, speed):
            turtle.forward(speed)
            yield(0)

        direction(90)

        for _ in range(0, UNIT_SIZE, speed):
            turtle.forward(speed)
            yield(0)

        direction(90)

    for _ in range(0, GRID_SIZE, speed):
        turtle.forward(speed)
        yield(0)

heckle = Turtle(shape='arrow')
heckle.speed(5)  # speed needs to be a factor of UNIT_SIZE
heckle.penup()
heckle.goto(-GRID_SIZE / 2, -GRID_SIZE / 2)
heckle.pendown()
heckle.left(90)

jeckle = Turtle(shape='arrow')
jeckle.speed(5)
jeckle.penup()
jeckle.goto(GRID_SIZE / 2, -GRID_SIZE / 2)
jeckle.pendown()
jeckle.left(180)

generator1, generator2 = half_grid(heckle), half_grid(jeckle)

while (next(generator1, 1) + next(generator2, 1) < 2):
    pass

heckle.hideturtle()
jeckle.hideturtle()

screen = Screen()
screen.exitonclick()

But that's probably overkill for your purposes...

16: Array-Backed Grids, This grid of numbers can also be called a two-dimensional array or a matrix. eight squares Duration: 3:44 Posted: Apr 5, 2013 Photo detail for Python: Simple Square Grid: Title: Python: Simple Square Grid Date: July 13, 2017 Size: 254kB Resolution: 1417px x 1289px More Galleries of Python: Simple Square Grid

Your main problem is that you turn the turtle 90 degrees left after every square. This means that you'll simply make the same 4 squares over and over.

Instead, you have to advance the turtle size units and draw the next square. Do this 20 times; then you can go to the next row.

For this, I suggest that you write a loop to draw one row. Then write a few lines to come back to the starting point, but down size units. Loop on that process 20 times.

Python Program to Draw a Square and Chess Board Using Turtle, The following python program draws a square shape using the basic turtle commands, The following program draws a 3�3 grid of 30 pixel boxes. Simple Grid. from PIL import Image, Okay cool but I often need a specific number of squares in my grid. > python grid.py 1800 2400 50 Saving grid-1800-2400-50

Here is an interesting approach I did that draws rows and then columns:

import turtle as tur


def make_grid(rows, columns):
    tur.color('black', 'white')
    tur.begin_fill()
    dir = 1
    tur.forward(20 * columns)
    for _ in range(rows):
        if dir > 0:
            tur.right(90)
            tur.forward(20)
            tur.right(90)
            tur.forward(20 * columns)
        else:
            tur.left(90)
            tur.forward(20)
            tur.left(90)
            tur.forward(20 * columns)
        dir *= -1
    tur.penup()
    tur.home()
    tur.pendown()
    tur.right(90)
    dir = 1
    tur.forward(20 * rows)
    for _ in range(columns):
        if dir > 0:
            tur.left(90)
            tur.forward(20)
            tur.left(90)
            tur.forward(20 * rows)
        else:
            tur.right(90)
            tur.forward(20)
            tur.right(90)
            tur.forward(20 * rows)
        dir *= -1
    tur.end_fill()
    tur.done()


make_grid(10, 10)

I think it's more fun to watch like this, as opposed to making a bunch of squares in a row. Obviously it could be improved with an adjustable square size though...

SQUARE_GRID, SQUARE_GRID, a Python library which generates a grid of points over the interior of a square in 2D. The 2D "square" is actually the� Create a simple grid and print it properly in python. - simple-grid.py

There are a few ways to draw a 20 x 20 grid with Python, here are a couple:

Using turtle:

import turtle

def draw_box(t,x,y,size,fill_color):
    t.penup() # don't draw
    t.goto(x,y) # move to position
    t.pendown() # draw

    t.fillcolor(fill_color)
    t.begin_fill()  # set fill color

    for i in range(0,4):
        grid.forward(size) # move forward
        grid.right(90) # turn right 90 degrees

    t.end_fill()


def draw_grid():
    fill_color = 'white'
    start_x = -320 # starting x position of the grid
    start_y = -100 # starting y position of the grid
    box_size = 30 # pixel size of each square in the grid
    for i in range(0,20): # 20x20 grid
        for j in range(0,20):
            draw_box(grid,start_x+j*box_size,start_y+i*box_size,box_size,fill_color)


grid = turtle.Turtle()
draw_grid()
turtle.done()

Using pillow (PIL):

from PIL import Image, ImageDraw

def main():
    steps = 25
    height = 600
    width = 600
    img = Image.new(mode='L', size=(height, width), color=255) # create blank image
    # img = Image.open('filename.png') # or load an image

    draw = ImageDraw.Draw(img)
    y_start = 0
    y_end = img.height
    step_size = int(img.width / steps)

    for x in range(0, img.width, step_size):
        line = ((x, y_start), (x, y_end))
        draw.line(line, fill='black')

    x_start = 0
    x_end = img.width

    for y in range(0, img.height, step_size):
        line = ((x_start, y), (x_end, y))
        draw.line(line, fill='black')

    del draw
    img.show()


if __name__ == '__main__':
    main()

Creating square grid polygon shapefile with Python?, The following script will do the job with GDAL and Python: import os, sys import ogr from math import ceil def main(outputGridfn,xmin,xmax,ymin,ymax,gridHeight � Python Tkinter grid() Method - This geometry manager organizes widgets in a table-like structure in the parent widget.

This is a code for drawing a simple grid in python of variable width, height and number of units in a grid.

#code to draw a grid
import turtle
import random
T= turtle.Turtle()
T.hideturtle()
turtle.tracer(0,0)





def draw_grid(num,width,height):
   n=num    # number of units in one column/row of a grid
   i=1
   for k in range (num):
       for j in range(num):

           for _ in range(2):
              turtle.forward(width*n)       #width of a unit of a grid
              turtle.left(90)
              turtle.forward(height*i)      #height of a unit of a grid
              turtle.left(90)
           i=i+1
        i=1
        n=n-1 


draw_grid(5,15,30)

turtle.update()
turtle.done()

Array-Backed Grid — Python Arcade Library 2.4.2a1 documentation, Keeps a second 2D grid of sprites to match 2D grid of numbers. array_backed_grid.py�. 1 2 3 4 5 6 7 8 9 10 11 12� Using the grid manager is easy. Just create the widgets, and use the grid method to tell the manager in which row and column to place them. You don’t have to specify the size of the grid beforehand; the manager automatically determines that from the widgets in it.

Simple drawing with turtle — Introduction to Programming with Python, Drawing a square�. Note. You're not always expected to know the anwer immediately. Learn by trial and error! Experiment, see what python does when� Creating a Grid. The way that we will keep track of pieces in the game is using a grid data structure. We will create a multidimensional list that contains 20 lists of 10 elements (rows and columns).

Making an 100X100 grid using turtle for python 3 : learnpython, How do I make a square with dimensions of 100X100 using python 3 and importing turtle. Turtle() for i in range(100): print('square grid') smart.forward(50i ) It could be as simple as instead of a random number guessing game change it to a� Calculations are simple with Python, and expression syntax is straightforward: the operators +, -, * and / work as expected; parentheses can be used for grouping. More about simple math functions in Python 3.

Python, Using the grid manager is easy. Just create the widgets, and use the grid method to tell the manager in which row and column to place them. How to draw square and rectangle in Python Turtle? Two functions that are useful for us for drawing square and rectangle are- forward() and left(). Before we draw any of the shapes, we must know the basic properties of them.

Comments
  • This is a good start! It's clear to me why the turtle can only make 4 squares. What path is the turtle taking? Can you trace it out by hand on a piece of paper by following the steps that the code will take?
  • This answer should be accepted: If you feel that this answer helped you, you could consider what to do when someone answers my question, and how to accept my answer
  • This doesn't run as presented due to an IndentationError, specifically ` unindent does not match any outer indentation level` on line 24, but there may be others once this one is fixed.