Creating a Window

Adjusting Window Size Dynamically in SDL

How can I adjust the size of an SDL window dynamically during runtime?

Abstract art representing computer programming

SDL allows you to adjust the size of a window dynamically using the SDL_SetWindowSize() function. Here's how you can integrate this into your application to change the window size based on user input or other conditions:

1#include <SDL.h>
2#include "Window.h"
3
4int main(int argc, char** argv) {
5  Window GameWindow;
6  SDL_Event event;
7  bool running = true;
8
9  while (running) {
10    while (SDL_PollEvent(&event)) {
11      if (event.type == SDL_QUIT) {
12        running = false;
13      } else if (event.type == SDL_KEYDOWN) {
14        switch (event.key.keysym.sym) {
15          case SDLK_UP:
16            SDL_SetWindowSize(
17              GameWindow.SDLWindow, 800, 600);  
18            break;
19          case SDLK_DOWN:
20            SDL_SetWindowSize(
21              GameWindow.SDLWindow, 640, 480);  
22            break;
23        }
24      }
25    }
26    GameWindow.RenderFrame();
27  }
28
29  SDL_Quit();
30  return 0;
31}

In this example, pressing the UP key increases the window size to 800x600, while pressing the DOWN key reduces it to 640x480. This dynamic resizing can be triggered by any event or condition in your program.

This Question is from the Lesson: