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  1. #include <cmath>
  2. #include <iostream>
  3. #include <utility>
  4.  
  5. std::pair<float, float> rotate(std::pair<float, float> origin, std::pair<float, float> start, unsigned int degrees)
  6. {
  7. 	std::pair<float, float> diff = std::make_pair(start.first - origin.first, start.second - origin.second);
  8. 	float currentAngle = ::atan2(diff.second, std::abs(diff.first));
  9. 	float newAngle = currentAngle + (degrees / 180.0 * 3.1415926539);
  10. 	float radius = std::sqrt(diff.first * diff.first + diff.second * diff.second);
  11. 	float cosAngle = ::cos(newAngle);
  12. 	float sinAngle = ::sin(newAngle);
  13. 	float x = origin.first + radius * cosAngle;
  14. 	float y = origin.second + radius * sinAngle;
  15. 	return std::make_pair(x, y);
  16. }
  17.  
  18. int main() 
  19. {
  20. 	std::pair<float, float> origin = std::make_pair(0.0, 0.0);
  21. 	std::pair<float, float> start = std::make_pair(1.0, 0.0);
  22. 	const unsigned int degrees = 45;
  23. 	for (unsigned int i = 0; i < 360; i += degrees)
  24. 	{
  25. 		std::pair<float, float> newPos = rotate(origin, start, i);
  26. 		std::cout << "Rotated to " << i << " degrees: (" << newPos.first << ", " << newPos.second << ")" << std::endl;
  27. 	}
  28. 	return 0;
  29. }
Success #stdin #stdout 0s 3340KB
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Standard input is empty
stdout
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Rotated to 0 degrees: (1, 0)
Rotated to 45 degrees: (0.707107, 0.707107)
Rotated to 90 degrees: (-4.37114e-08, 1)
Rotated to 135 degrees: (-0.707107, 0.707107)
Rotated to 180 degrees: (-1, -8.74228e-08)
Rotated to 225 degrees: (-0.707107, -0.707107)
Rotated to 270 degrees: (1.19249e-08, -1)
Rotated to 315 degrees: (0.707107, -0.707107)
https://ideone.com/nTGXuv
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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