Calculate Mouse Position

1#include <SDL.h>
2#include <iostream>
3
4void CalculateMouseDistances(
5  int mouseX, int mouseY,
6  int windowWidth, int windowHeight
7) {
8  int distanceFromLeft = mouseX;
9  int distanceFromTop = mouseY;
10  int distanceFromRight = windowWidth - mouseX;
11  int distanceFromBottom = windowHeight - mouseY;
12
13  std::cout << "Distance from left: "
14    << distanceFromLeft << '\n';      
15  std::cout << "Distance from top: "
16    << distanceFromTop << '\n';        
17  std::cout << "Distance from right: "
18    << distanceFromRight << '\n';    
19  std::cout << "Distance from bottom: "
20    << distanceFromBottom << '\n';  
21}
22
23int main(int argc, char* argv[]) {
24  if (SDL_Init(SDL_INIT_VIDEO) != 0) {
25    std::cerr << "SDL_Init Error: "
26      << SDL_GetError() << '\n';
27    return 1;
28  }
29
30  SDL_Window* window = SDL_CreateWindow(
31    "Mouse Distance Calculation",
32    100, 100, 640, 480, SDL_WINDOW_SHOWN);
33  if (window == nullptr) {
34    std::cerr << "SDL_CreateWindow Error: "
35      << SDL_GetError() << '\n';
36    SDL_Quit();
37    return 1;
38  }
39
40  int windowWidth, windowHeight;
41  SDL_GetWindowSize(
42    window, &windowWidth, &windowHeight);
43
44  SDL_Event event;
45  bool running = true;
46  while (running) {
47    while (SDL_PollEvent(&event)) {
48      if (event.type == SDL_QUIT) {
49        running = false;
50      } else if (event.type == SDL_MOUSEMOTION) {
51        int mouseX = event.motion.x;
52        int mouseY = event.motion.y;
53        CalculateMouseDistances(
54          mouseX, mouseY,
55          windowWidth, windowHeight
56        );
57      }
58    }
59  }
60
61  SDL_DestroyWindow(window);
62  SDL_Quit();
63  return 0;
64}