Moto di una pallina con c++ e raylib : cinematica e rimbalzi a schermo

moto_pallina_01.cpp

#include <array>
#include <vector>

#include "raylib.h"

#define SCREEN_WIDTH 1000
#define SCREEN_HEIGHT 800

using pallina_info = std::array<float,4>;

int main() {
    std::vector<pallina_info> palline;
    std::array<float,4> obj; // x,y, vx, vy
    obj[0]=50;
    obj[1] = 60;
    obj[2] = GetRandomValue(50,250);
    obj[3] = 100;


    InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "Falling Sand Simulation");

    SetTargetFPS(30); // Set our game to run at 60 frames-per-second

    float dt = 0;

    // Main game loop
    while (!WindowShouldClose()) // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        dt = GetFrameTime();

        obj[1] = obj[1] + obj[3]*dt; // y = y + vy*dt
        obj[0] = obj[0] + obj[2]*dt;

        if(obj[1]+ 30 > SCREEN_HEIGHT or obj[1]-30 <0) {
            obj[3] *= -1;
        }

        if(obj[0]+ 30 > SCREEN_WIDTH or obj[0]-30 <0) {
            obj[2] *= -1;
        }

        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();

        ClearBackground(RAYWHITE);
        DrawText(TextFormat("dt = %.4f",dt),100,30,32,BLACK);
        DrawCircle(obj[0],obj[1],30,RED);


        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    // De-Initialization
    //--------------------------------------------------------------------------------------
    CloseWindow(); // Close window and OpenGL context
    //--------------------------------------------------------------------------------------

    return 0;
}