Python:

A: Write a program chooseButton3.py, modifying chooseButton2.py. Look at the format of the list buttonSetup, and extend it so there is a larger choice of buttons and colors. Add at least one button and color.

B: Further extend the program chooseButton3.py by adding some further graphical object shape to the picture, and extend the list shapePairs, so they can all be interactively colored.

chooseButton2.py:

''Make a choice of colors via mouse clicks in Rectangles -- Demonstate loops using lists of tuples of data.'''

from graphics import *

def isBetween(x, end1, end2): '''Return True if x is between the ends or equal to either. The ends do not need to be in increasing order.''' return end1 <= x <= end2 or end2 <= x <= end1

def isInside(point, rect): '''Return True if the point is inside the Rectangle rect.''' pt1 = rect.getP1() pt2 = rect.getP2() return isBetween(point.getX(), pt1.getX(), pt2.getX()) and \ isBetween(point.getY(), pt1.getY(), pt2.getY())

def makeColoredRect(corner, width, height, color, win): ''' Return a Rectangle drawn in win with the upper left corner and color specified.'''

corner2 = corner.clone() corner2.move(width, -height) rect = Rectangle(corner, corner2) rect.setFill(color) rect.draw(win) return rect

def getChoice(choicePairs, default, win): #NEW '''Given a list choicePairs of tuples with each tuple in the form (rectangle, choice), return the choice that goes with the rectangle in win where the mouse gets clicked, or return default if the click is in none of the rectangles.'''

point = win.getMouse() for (rectangle, choice) in choicePairs: if isInside(point, rectangle): return choice return default def main(): win = GraphWin('pick Colors', 400, 400) win.yUp()

#NEW choicePairs = list() buttonSetup = [(310, 350, 'red'), (310, 310, 'yellow'), (310, 270, 'blue')] for (x, y, color) in buttonSetup: button = makeColoredRect(Point(x, y), 80, 30, color, win) choicePairs.append((button, color))

house = makeColoredRect(Point(60, 200), 180, 150, 'gray', win) door = makeColoredRect(Point(90, 150), 40, 100, 'white', win) roof = Polygon(Point(50, 200), Point(250, 200), Point(150, 300)) roof.setFill('black') roof.draw(win) #NEW shapePairs = [(house, 'house'), (door, 'door'), (roof, 'roof')] msg = Text(Point(win.getWidth()/2, 375),'') msg.draw(win) for (shape, description) in shapePairs: prompt = 'Click to choose a ' + description + ' color.' msg.setText(prompt) color = getChoice(choicePairs, 'white', win) shape.setFill(color)

win.promptClose(msg)

main()