Collision_-_rectsoverlap.c

#include "raylib.h"

// Our rectsoverlap function. Returns true/false.
static bool rectsoverlap(int x1,int y1,int w1,int h1,int x2,int y2,int w2,int h2);

int main(void)
{
    // Initialization
    //--------------------------------------------------------------------------------------
    const int screenWidth = 800;
    const int screenHeight = 450;

    InitWindow(screenWidth, screenHeight, "raylib example.");
 
    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
    //--------------------------------------------------------------------------------------

    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        int x1 = GetMouseX();
        int y1 = GetMouseY();
        int w1 = 64;
        int h1 = 64;
        int x2 = 200;
        int y2 = 200;
        int w2 = 100;
        int h2 = 100;
      
        
        //----------------------------------------------------------------------------------
        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();

            ClearBackground(RAYWHITE);
            
            DrawRectangle(x1,y1,w1,h1,YELLOW);
            DrawRectangle(x2,y2,w2,h2,RED);
            
            if(rectsoverlap(x1,y1,w1,h1,x2,y2,w2,h2)){
                DrawText("Collision!",0,20,20,DARKGRAY);
            }else{
                DrawText("No Collision!",0,20,20,DARKGRAY);
            }

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

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

    return 0;


}

// Rectangles overlap
bool rectsoverlap(int x1,int y1,int w1,int h1,int x2,int y2,int w2,int h2){
    if(x1 >= (x2 + w2) || (x1 + w1) <= x2) return false;
    if(y1 >= (y2 + h2) || (y1 + h1) <= y2) return false;
    return true;
}