c04ex08.pyw
Line segment info.
import math
from graphics import *
def main():
win = GraphWin("Line Segment Info", 400, 400)
win.setCoords(-10,-10,10,10)
msg = Text(Point(0,-9.5), "Click on endpoints of a line segment.")
msg.draw(win)
p1 = win.getMouse()
p1.draw(win)
p2 = win.getMouse()
p2.draw(win)
line = Line(p1,p2)
line.draw(win)
mark = Circle(line.getCenter(),0.15)
mark.setFill("cyan")
mark.draw(win)
dx = p2.getX() - p1.getX()
dy = p2.getY() - p1.getY()
slope = float(dy)/dx
length = math.sqrt(dx*dx + dy*dy)
msg.setText("Length: "+str(round(length,2))+" Slope: "+ str(round(slope,2)))
win.getMouse()
win.close()
main()
