[英]Change background of SDL2 window?
我可以创建一个 SDL2 窗口,但我不知道如何更改此窗口的背景颜色。
我的代码:
#include "SDL.h"
SDL_Window *window;
void main()
{
window = SDL_CreateWindow("TEST", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
SDL_Delay(3000);
}
如何将此窗口的背景颜色更改为黑色?
你应该设置绘图颜色与SDL_SetRenderDrawColor
然后用SDL_RenderClear
:
(代码直接来自SDL wiki )
int main(int argc, char* argv[])
{
SDL_Window* window;
SDL_Renderer* renderer;
// Initialize SDL.
if (SDL_Init(SDL_INIT_VIDEO) < 0)
return 1;
// Create the window where we will draw.
window = SDL_CreateWindow("SDL_RenderClear",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
512, 512,
0);
// We must call SDL_CreateRenderer in order for draw calls to affect this window.
renderer = SDL_CreateRenderer(window, -1, 0);
// Select the color for drawing. It is set to red here.
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
// Clear the entire screen to our selected color.
SDL_RenderClear(renderer);
// Up until now everything was drawn behind the scenes.
// This will show the new, red contents of the window.
SDL_RenderPresent(renderer);
// Give us time to see the window.
SDL_Delay(5000);
// Always be sure to clean up
SDL_Quit();
return 0;
}
如果您不使用 SDL2 渲染器,您可以这样做:
只需致电:
SDL_GL_SwapWindow(window);
后 :
SDL_GL_MakeCurrent(window, context);
就这样! 现在你有一个黑屏。
#include <SDL2/SDL.h>
#include <iostream>
using namespace std;
int main(){
int width=512, height=512;
SDL_Window *window=SDL_CreateWindow("Window", SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED, width, height, SDL_WINDOW_RESIZABLE);
if(window==NULL)
cout << "There was an error while initializing the window" << endl << SDL_GetError << endl;
SDL_Event event;
bool running=true;
while(running){
while(SDL_PollEvent(&event)){
if(event.type==SDL_QUIT){
running=false;
break;
}
}
SDL_GetWindowSize(window, &width, &height);
SDL_Surface *surface=SDL_GetWindowSurface(window);
Uint32 skyblue=SDL_MapRGB(surface->format, 65,193,193);
SDL_FillRect(surface, NULL, skyblue);
SDL_UpdateWindowSurface(window);
}
SDL_DestroyWindow(window);
SDL_Quit();
}
试试这个:
SDL_Window *wind;
SDL_Surface *windSurface = NULL
void main()
{
windSurface = SDL_GetWindowSurface(wind);
wind = SDL_CreateWindow("TEST", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
SDL_FillRect(windSurface, NULL, SDL_MapRGB(windSurface->format, 240, 200, 112));
SDL_UpdateWindowSurface(wind);
SDL_Delay(3000);
}
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