- 225 名前：デフォルトの名無しさん mailto:sage [2008/08/14(木) 20:37:13 ]
- 完全なソースを一応貼っておく。
#include <iostream>
struct Point {
double L1Point[2];
double L2Point[2];
double L1Slope;
double L2Slope;
double num[2];
};
Point* lineIntersect(Point* pt1);
std::ostream& operator<<(std::ostream& os, const Point& pt);
Point pt = {{10, 20}, {20, 44}, 10, 3, {3, 20}};
int main()
{
Point* ans = lineIntersect(&pt);
std::cout << "答えは(" << *ans << ")です\n";
}
Point* lineIntersect(Point* pt1)
{
pt1->num[0] = (pt1->L1Slope * pt1->L1Point[0] - pt1->L2Slope * pt1->L2Point[0] + pt1->L2Point[1] - pt1->L1Point[1]) / (pt1->L1Slope - pt1->L2Slope);
pt1->num[1] = pt1->L1Slope * (pt1->num[0] - pt1->L1Point[0]) + pt1->L1Point[1];
return pt1;
}
std::ostream& operator<<(std::ostream& os, const Point& pt)
{
os << pt.num[0] << ' ' << pt.num[1];
return os;
}
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