# connect the dots program.
# responds to clicks by connecting the dots.
# when same point is clicked again, make and fill a polygon.

import math, time
import zellegraphics as zg

TOLERANCE = 5
def distance(point1, point2):
    dx = point1.getX() - point2.getX()
    dy = point1.getY() - point2.getY()
    return math.sqrt(dx **2 + dy **2)

def drawPoint (p):
    c = zg.Circle(p, TOLERANCE)
    c.setFill('magenta')
    c.draw(win)
    

def tests():
    p1 = zg.Point(1,7)
    p2 = zg.Point(4, 11)
    p3 = zg.Point(-1, 23)
    print('Distances (should be 5 and 13): ', distance(p1, p2), distance (p2, p3))

#tests()

win = zg.GraphWin()
pointList = [];
while True:
    newPoint = win.getMouse()
    if len(pointList) > 1 and distance(newPoint, pointList[0]) <= TOLERANCE:
        break
    drawPoint(newPoint);
    pointList.append(newPoint)
    if len(pointList) > 1:
        zg.Line(pointList[-2], pointList[-1]).draw(win)
poly = zg.Polygon(pointList)
poly.setFill('green')
poly.draw(win)
    
win.getMouse()
win.close()