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allwiyn 23Aug2007 08:48

how to write a function
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.

seeguna 23Aug2007 12:05

Re: how to write a function
It is better to go thru some circle clipping algorithms for better implementation

oleber 23Aug2007 12:42

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

listendinesh 24Aug2007 16:23

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

struct point
int x,
int y

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