COSC$235$ $ November$19,$2008$
Test%3%
Name:%_______________________________% Pledged:%_______________________________%
Answer$all$questions$completely.$
1. Indicate$for$each$term$in$the$box$ONE$example$of$the$concept$in$the$program.$
class Button:
"A button is a labeled rectangle in a window."
def __init__(self, win, center, width, height, label):
"Creates a rectangular button"
w,h = width/2.0, height/2.0
x,y = center.getX(), center.getY()
self.xmax, self.xmin = x+w, x-w
self.ymax, self.ymin = y+h, y-h
p1 = Point(self.xmin, self.ymin)
p2 = Point(self.xmax, self.ymax)
self.rect = Rectangle(p1,p2)
self.rect.setFill('lightgray')
self.rect.draw(win)
self.label = Text(center, label)
self.label.draw(win)
self.deactivate()
def clicked(self, p):
"Returns true if button active and p is inside"
return self.active and \
self.xmin <= p.getX() <= self.xmax and \
self.ymin <= p.getY() <= self.ymax
def getLabel(self):
"Returns the label string of this button."
return self.label.getText()
def activate(self):
"Sets this button to 'active'."
self.label.setFill('black')
self.rect.setWidth(2)
self.active = True
def deactivate(self):
"Sets this button to 'inactive'."
self.label.setFill('darkgrey')
self.rect.setWidth(1)
self.active = False
$method$definition$
1$formal$parameter$
2$actual$parameter$(argument)$
3$method$call$
4$local$variable$
5$Boolean‐valued$expression$$
6$initialization$method$(constructor)$
7$class$definition$
8$instance$variable$
9$object$construction$
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