Hi guys i was wondering how in python you invert this line as I have indicated. I have tried all sorts of mathemtical functions. I am using zelle graphics module. Currnetly I have produced lines going in one direction im trying to produce the same lines again but in the other direction i am sure its just a logical solution. Any help would be most appreciated. Thanks.

``````from graphics import *

def main():
colour = raw_input("Enter the patch colour: ")
win = GraphWin("Patch", 200, 200)
drawPatch(win, 50, 50, colour)

def drawPatch(win, x, y, colour):
for i in range(5):
for j in range(5):
if (i + j) % 2 == 0:
topLeftX = x + i * 20
topLeftY = y + j * 20
topRightX = x + i * 20  #how to invert lines so they cross
topRightY = y + j * 20

line1 = Line(Point(topLeftX, topLeftY),
Point(topLeftX + 20, topLeftY + 20))
line1.setFill(colour)
line1.draw(win)
#Next Lines accross
line2 = Line(Point(topRightX, topRightY),
Point(topRightX + 20, topRightY + 20))
line2.setFill(colour)
line2.draw(win)

main()``````

Hello, can you point me to zelle graphics module so I can try and trouble shoot this?

edit: found the module.

I changed lines 24&25. Well really only 25. If this is the result you desired...

``````line2 = Line(Point(topRightX, topRightY),
Point(topRightY - 20, topRightX + 20))``````

Thanks!

Sorry to bring the thread back up again but Im not sure why the lines aren't going alway accross (the inverted ones.) Im not sure which variable i should edit to effect this. Whenever i edit the points its editing the angle. Any help would be muchly appreciated. Thank you.

``````from graphics import *

def main():
colour = raw_input("Enter the patch colour: ")
win = GraphWin("patch", 180, 180)
drawLinesCrossPatch(win, 0, 0, colour)

def drawLinesCrossPatch(win, x, y, colour):
for i in range(9):
for j in range(9):
if (i + j) % 2 == 0:
topLeftX = x + i * 8
topLeftY = y + j * 8
topRightX = x + i * 8
topRightY = y + j * 8

line1 = Line(Point(topLeftX, topLeftY),
Point(topLeftX + 20, topLeftY + 20))
line1.setFill(colour)
line1.setWidth(2)
line1.draw(win)

line2 = Line(Point(topRightX, topRightY),
Point(topRightX - 20, topRightY + 20))
line2.setFill(colour)
line2.setWidth(2)
line2.draw(win)
main()``````
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