Smooth Mouse Following

1#include <SDL.h>
2#include <cmath>
3#include <iostream>
4#include "Window.h"
5
6class FollowingObject {
7public:
8  void Tick() {
9    // Get current mouse position
10    int MouseX, MouseY;
11    SDL_GetMouseState(&MouseX, &MouseY);
12
13    // Calculate distance to mouse
14    float DX = MouseX - X;
15    float DY = MouseY - Y;
16
17    // Move towards mouse with smooth interpolation
18    // Adjust for different follow speeds
19    float Speed = 0.1f;
20    X += DX * Speed; 
21    Y += DY * Speed; 
22
23    // Round to nearest pixel for display
24    int DisplayX{
25      static_cast<int>(std::round(X))};
26    int DisplayY{
27      static_cast<int>(std::round(Y))};
28
29    std::cout << "Object position: ("
30      << DisplayX << ", " << DisplayY
31      << ") Mouse: (" << MouseX
32      << ", " << MouseY << ")\n";
33  }
34
35private:
36  // Using floats for smooth movement
37  float X{0.0f};
38  float Y{0.0f};
39};
40
41int main(int argc, char** argv) {
42  SDL_Init(SDL_INIT_VIDEO);
43  Window GameWindow;
44  FollowingObject Follower;
45  SDL_Event E;
46
47  while (true) {
48    while (SDL_PollEvent(&E)) {
49      // Handle other events...
50    }
51
52    Follower.Tick();
53    GameWindow.Update();
54  }
55
56  SDL_Quit();
57  return 0;
58}

1#include <SDL.h>
2
3class AdvancedFollower {
4public:
5  void Tick() {
6    int MouseX, MouseY;
7    SDL_GetMouseState(&MouseX, &MouseY);
8
9    // Get frame time for consistent speed
10    float DeltaTime = GetDeltaTime();
11
12    // Calculate spring physics
13    float SpringStrength = 8.0f;
14    float Damping = 0.8f;
15
16    // Update velocity
17    VelocityX += (MouseX - X)
18      * SpringStrength * DeltaTime;
19    VelocityY += (MouseY - Y)
20      * SpringStrength * DeltaTime;
21
22    // Apply damping
23    VelocityX *= Damping;
24    VelocityY *= Damping;
25
26    // Update position
27    X += VelocityX * DeltaTime;
28    Y += VelocityY * DeltaTime;
29  }
30
31private:
32  float X{0.0f}, Y{0.0f};
33  float VelocityX{0.0f}, VelocityY{0.0f};
34
35  float GetDeltaTime() {
36    static Uint32 LastTime = SDL_GetTicks();
37    Uint32 CurrentTime = SDL_GetTicks();
38    float DeltaTime = (CurrentTime - LastTime)
39      / 1000.0f;
40    LastTime = CurrentTime;
41    return DeltaTime;
42  }
43};