hello , I need to know how to get the direction from point A to point B
eg. point_direction(0 , 0 , 100,100); would equal 315
x1 y1 x2 y2
how do I compute this ?
Thanks !
hello , I need to know how to get the direction from point A to point B
eg. point_direction(0 , 0 , 100,100); would equal 315
x1 y1 x2 y2
how do I compute this ?
Thanks !
Are you looking for the bearing? You would need to use the inverse trig functions found in the <cmath> header then convert the answers from radians to degrees.
Are you looking for the bearing? You would need to use the inverse trig functions found in the <cmath> header then convert the answers from radians to degrees.
what would the code be to this ?
#include <cmath>
#include <iostream>
int main()
{
double x1 = 0;
double y1 = 0;
double x2 = 100;
double y2 = 100;
std::cout << 180./3.14159 * atan((x2-x1)/(y2-y1)) << std::endl;
return 0;
}
The answer is 45 not 315 going from (0,0), to (100,100), right?
Dave
Just look up the distance formula.
#include <cmath> #include <iostream> int main() { double x1 = 0; double y1 = 0; double x2 = 100; double y2 = 100; std::cout << 180./3.14159 * atan((x2-x1)/(y2-y1)) << std::endl; return 0; }
The answer is 45 not 315 going from (0,0), to (100,100), right?
Dave
well in graphics everything starts at the top left hand side :icon_smile:
Ah, yes. In mathematics the standard is +x is 0 degrees and the angle increases counter-clockwise. You'll have to adjust accordingly.
Dave