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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. // range : [min, max]
  6. int random(int min, int max) {
  7.    static bool first = true;
  8.    if (first) {  
  9.       srand(time(NULL)); //seeding for the first time only!
  10.       first = false;
  11.    }
  12.    return min + rand() % (max - min + 1);
  13. }
  14.  
  15. std::pair<int,int> rand_heading_point(int start_x, int start_y, int max_x, int max_y, int heading_dir) {
  16.     int turn_x = 0;
  17.     int turn_y = 0;
  18.  
  19.     // if heading_dir == 0 --> object moves horicontally towards max_x, increment x
  20.     // if heading_dir == 90 --> object moves vertically towards max_y, increment y
  21.     if (heading_dir <= 90) {
  22.       turn_x = random(start_x, max_x);
  23.       turn_y = random(start_y, max_y);
  24.     } else if (heading_dir <= 180) {
  25.       turn_x = random(0, start_x);
  26.       turn_y = random(start_y, max_y);
  27.     } else if (heading_dir <= 270) {
  28.       turn_x = random(0, max_y);
  29.       turn_y = random(0, start_y);
  30.     } else {
  31.       turn_x = random(start_x, max_x);
  32.       turn_y = random(0, start_y);
  33.     }
  34.  
  35.     return std::make_pair(turn_x, turn_y);
  36. }
  37.  
  38. void change_heading_dir(int curr_x, int curr_y, int turn_x, int turn_y, int &heading_dir) {
  39. 	if (curr_x == turn_x || curr_y == turn_y) {
  40. 		heading_dir *= 2;
  41. 	}
  42. }
  43.  
  44. // edit: use floats
  45. void move(int &curr_x, int &curr_y, int heading_dir) {
  46. 	int heading_rad = heading_dir * (M_PI / 180);
  47.    	int inc_len = 1;
  48.     int x_inc = Math.cos(heading_rad) * inc_len;
  49.     int y_inc = Math.sin(heading_rad) * inc_len;
  50.  
  51.   	curr_x += x_inc;
  52.   	curr_y += y_inc;
  53. }
  54.  
  55. int main() {
  56. 	// your code goes here
  57.  
  58. 	int start_x = 100;
  59. 	int start_y = 100;
  60. 	int width = 500;
  61. 	int height = 500;
  62. 	int dir = 0;
  63.  
  64. 	auto heading_point = rand_heading_point(start_x, start_y, width, height, dir);
  65.  
  66. 	cout << "x: " << heading_point.first << ", y: " << heading_point.second << endl;
  67.  
  68. 	return 0;
  69. }
Success #stdin #stdout 0s 3412KB
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Standard input is empty
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x: 306, y: 345
https://ideone.com/btgKmD
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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