Python求点到直线的距离

使用之前需引入math库 

def getDis(pointX,pointY,lineX1,lineY1,lineX2,lineY2):
    a=lineY2-lineY1
    b=lineX1-lineX2
    c=lineX2*lineY1-lineX1*lineY2
    dis=(math.fabs(a*pointX+b*pointY+c))/(math.pow(a*a+b*b,0.5))
    return dis