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Midterm Exam 2 Review Spring 2004: Graphics from a List

Comments, answers, and questions go here:

(Link back to Sp2004 Midterm 2 Review)

In the example given it says that "1 000 010 100 200" draws a line from (0,10) to (100,200). In the next paragraph "1 102 200 102 300" is given. Why does 000 change to 102? Why are there 6 numbers given and only 4 numbers needed in the coordinates? What coordinates would the second input draw a line between?
def doGraphics(list):
canvas=makePicture(getMediaPath("640x480.jpg")
for i in list:
if list[0]=="b":
addRectFilled(canvas, int(list[1,3]), int(list[4,6]),black)
if list[0]=="l":
addLine(canvas, int(list[1,3]), int(list[4,6]), int(list[7,9]), int(list[10,12]))
return canvas

asides from the indentation...
Rachel, just a different example. Mark Guzdial

Can someone give a hint of where to start...please :-(

Chapter 11 in the book. Section 11.2, I think. Mark Guzdial

<pre>
I think I am pretty close, but this code still doesn't work when I run it through JES. Any hints? 

list=["b 100 200","b 101 200","b 102 200","l 102 200 102 300"] 
def doGraphics(list):
  canvas=makePicture(getMediaPath("7x95in.jpg"))
  i=0
  for eachString in list:
    Ax= int(eachString[2]+eachString[3]+eachString[4])
    Ay=int(eachString[6]+eachString[7]+eachString[8])
    if len(eachString) < 10:
      addLine(canvas,Ax,Ay,Ax,Ay)
    if len(eachString) > 9:
      Bx=int(eachString[10]+eachString[11]+eachString[12])
      By=int(eachString[14]+eachString[15]+eachString[16])
      addLine(canvas,Ax,Ay,Bx,By)
  return canvas
  show (canvas)

Shelley Moister
In the example given it says that "1 000 010 100 200" draws a line from (0,10) to (100,200). In the next paragraph "1 102 200 102 300" is given. Why does 000 change to 102? Why are there 6 numbers given and only 4 numbers needed in the coordinates? What coordinates would the second input draw a line between?

Think of it as :a line from (102,200) to (102,300). but the first number is always 1. That designates it as a line.



Section 11.2 deals with the last homework, where we make the website.
I am trying to figure out how to get the actual coordinates from the list into where we want it to be. I looked in the book and above but still dont understand it.
Thomas Sobeck
Section 11.1.2, p. 284, has the solution to this problem. Thomas, try printing out the values you're getting. It can be hard to get the indexes just right. Mark Guzdial



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