Write a program which generates the following pattern, assuming that numSquares defines the number of squares and unitSize represents the width of each square.

Solution:

from cs1graphics import *

numBlocks = 8                         # number of levels
size = 30                             # the height of one level
screenSize = size * numBlocks
paper = Canvas(screenSize, screenSize)
centerX = screenSize - size/2
centerY = size/2

# create levels from top to bottom
for level in range(numBlocks):
    block = Square(size, Point(centerX, centerY))
    block.setFillColor('gray')
    paper.add(block)

    centerX -= size
    centerY += size

Write a program which generates the following pattern, assuming that numLevels defines the number of levels and unitSize represents the width of each square.

Solution:

from cs1graphics import *

numLevels = 8                             # number of levels
unitSize = 30                             # the height of one level
screenSize = unitSize * (1 + numLevels)
paper = Canvas(screenSize, screenSize)

# create levels from top to bottom
for level in range(numLevels):
    # all blocks at this level have same y-coordinate
    centerY = unitSize * (numLevels - level)
    leftmostX = unitSize
    for blockCount in range(level + 1):
        block = Square(unitSize)
        block.move(leftmostX + unitSize * blockCount, centerY)
        block.setFillColor('gray')
        paper.add(block)