# 这个是4.31的代码，一个函数里包含了。在线上，在线左，在线右
def judgePoint(x0, y0, x1, y1, x2, y2):juMethod = ((x1 - x0) * (y2 - y0)) - ((x2 - x0) * (y1 - y0))if juMethod > 0:print("p2 is on the left side of the line from p0 to p1")elif juMethod == 0:print("p2 is on the same line from p0 to p1")elif juMethod < 0:print("p2 is on the right side of the line from p0 to p1")turtle.penup()turtle.goto(x0, y0)turtle.dot(6, 'red')turtle.pendown()turtle.goto(x1, y1)turtle.dot(6, 'red')turtle.penup()turtle.goto(x2, y2)turtle.dot(6, 'blue')turtle.hideturtle()turtle.done()judgePoint(34, 20, 65, 95, -50, 40)
judgePoint(10, 10, 50, 50, 20, 20)
judgePoint(34, 20, 65, 95, 50, 25)

def leftOfTheLine(x0, y0, x1, y1, x2, y2):juMethod = ((x1 - x0) * (y2 - y0)) - ((x2 - x0) * (y1 - y0))if juMethod > 0:print("p2 is on the left side of the line from p0 to p1")turtle.penup()turtle.goto(x0, y0)turtle.dot(6, 'red')turtle.pendown()turtle.goto(x1, y1)turtle.dot(6, 'red')turtle.penup()turtle.goto(x2, y2)turtle.dot(6, 'blue')turtle.hideturtle()turtle.done()def onTheSameLine(x0, y0, x1, y1, x2, y2):juMethod = ((x1 - x0) * (y2 - y0)) - ((x2 - x0) * (y1 - y0))if juMethod == 0:print("p2 is on the same line from p0 to p1")turtle.penup()turtle.goto(x0, y0)turtle.dot(6, 'red')turtle.pendown()turtle.goto(x1, y1)turtle.dot(6, 'red')turtle.penup()turtle.goto(x2, y2)turtle.dot(6, 'blue')turtle.hideturtle()turtle.done()def onTheLineSegment(x0, y0, x1, y1, x2, y2):juMethod = ((x1 - x0) * (y2 - y0)) - ((x2 - x0) * (y1 - y0))if juMethod < 0:print("p2 is on the right side of the line from p0 to p1")turtle.penup()turtle.goto(x0, y0)turtle.dot(6, 'red')turtle.pendown()turtle.goto(x1, y1)turtle.dot(6, 'red')turtle.penup()turtle.goto(x2, y2)turtle.dot(6, 'blue')turtle.hideturtle()turtle.done()

# 此三段代码一次运行一个，不能同时哦
leftOfTheLine(34, 20, 65, 95, -50, 40)
onTheSameLine(10, 10, 50, 50, 20, 20)
onTheLineSegment(34, 20, 65, 95, 50, 25)