我在c4droid中编程,但我无法使触摸事件发挥作用。 尝试切换或if语句,但没有任何工作,我确定渲染是好的,因为如果我删除开关,那么它通常呈现
这里是我的代码:
#include <SDL2/SDL.h>
int main()
{
SDL_Window *window = NULL;
window = SDL_CreateWindow("Shooter", SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_SHOWN);
// Setup renderer
SDL_Renderer *renderer = NULL;
renderer = SDL_CreateRenderer(window, 0, SDL_RENDERER_ACCELERATED);
// Set render color to red ( background will be rendered in this color )
SDL_SetRenderDrawColor(renderer, 0, 255, 25, 255);
// Clear winow
SDL_RenderClear(renderer);
// Creat a rect at pos ( 50, 50 ) that's 50 pixels wide and 50 pixels
// high.
SDL_SetRenderDrawColor(renderer, 255, 0, 255, 255);
SDL_Rect r;
r.x = 500;
r.y = 500;
r.w = 50;
r.h = 50;
SDL_Rect e;
e.x = 5;
e.y = 5;
e.w = 50;
e.h = 50;
SDL_Event event;
while(SDL_PollEvent(&event) != 0) {
switch (event.type) {
case SDL_FINGERDOWN :
e.x = e.x + 10;
SDL_RenderFillRect(renderer, &r);
SDL_RenderFillRect(renderer, &e);
SDL_RenderPresent(renderer);
break;
}
}
// Wait for 5 sec
SDL_Delay(50000);
SDL_DestroyWindow(window);
SDL_Quit();
}
答案 0 :(得分:1)
您需要确保轮询活动。
while(true) {
while(SDL_PollEvent(&event) != 0) {
switch (event.type) {
case SDL_FINGERDOWN :
e.x = e.x + 10;
SDL_RenderFillRect(renderer, &r);
SDL_RenderFillRect(renderer, &e);
SDL_RenderPresent(renderer);
break;
// Render rect
}
}
}
如果事件不是NULL,SDL_PollEvent将从队列中获取下一个事件并将其存储在事件所指向的SDL_Event中。
编辑:不要删除while(true)循环,将其放入其中。对不起,我可能应该在开始时更清楚一点。