how to write a function
hi,
How to write a function that checks if the circle passes through four given points. plz give me the logic or concept for making this function. 
Re: how to write a function
It is better to go thru some circle clipping algorithms for better implementation

Re: how to write a function
Calculate the center of the circle (probably you have it :p).
And calculate the distance of this points to the center. :cool: Mathematics 
Re: how to write a function
If you have radius and center cordinates then you can use the standred equation of circle.
((X H)*(X H)) + ((Y K)*(Y  K)) = R*R H > center x cordinate K > center y cordinate R > Radius X > x cordinate of given point Y > y cordinate of given point Make a function which take two arguments ( given point x and y cordinate) and return a bool flag ( true if circle passes through given point otherwise false). In function calculate X H and get its sqrt (Given point X  Center Point X) calculate Y K and get its sqrt add both result and compare with radius square if both equal the and get its sqrt Note : 1 : Please take care of floating point issues 2 : This is for one point you can extend for more points 3 : make a struct for point , that would be a good candidate like Code:
struct point 
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