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| #include <iostream>
#include <cmath>
#define M_PI acos(-1.0)
using namespace std;
double get_angle(double x1, double y1, double x2, double y2, double x3, double y3) {
double theta = atan2(x1 - x3, y1 - y3) - atan2(x2 - x3, y2 - y3);
if (theta > M_PI)
theta -= 2 * M_PI;
if (theta < -M_PI)
theta += 2 * M_PI;
theta = abs(theta * 180.0 / M_PI);
return theta;
}
int main() {
double x1 = 0;
double y1 = 1;
double x2 = 1;
double y2 = 0;
double x3 = -1;
double y3 = -2;
double angle1 = get_angle(x3, y3, x1, y1, x2, y2);
double angle2 = get_angle(x1, y1, x2, y2, x3, y3);
double angle3 = get_angle(x2, y2, x3, y3, x1, y1);
cout << angle2 << endl;
cout << angle3 << endl;
cout << angle1 << endl;
return 0;
}
|
