我在SDL中的鼠标位置出现了一些奇怪的行为。如果我将窗口的大小调整得更大,那么鼠标事件中的x,y位置似乎被限制在原始窗口的宽度和高度。
如果有一些我错过的函数调用告诉SDL鼠标区域的大小已经增加。
该应用的相关部分:
void Resize(int width, int height)
{
WindowWidth = width;
WindowHeight = height;
/* update OpenGL */
}
void Init()
{
glClearColor(0.f, 0.f, 0.f, 1.f);
Resize(WindowWidth, WindowHeight);
}
void MouseClick(int button, int state, int x, int y)
{
unsigned int MouseButton = unsigned(Mouse.z);
unsigned int b = (1 << (button-1));
if (state)
MouseButton = MouseButton | b;
else
MouseButton = MouseButton & (~b);
Mouse.z = MouseButton;
Mouse.x = x;
Mouse.y = y;
}
void MouseMove(int x, int y)
{
MouseRel.x = x - Mouse.x;
MouseRel.y = y - Mouse.y;
Mouse.x = x;
Mouse.y = y;
}
int main(int agrc, char *argv[])
{
bool quit = false;
SDL_Event event;
if ( SDL_Init(SDL_INIT_VIDEO) < 0)
return 1;
if (SDL_SetVideoMode(WindowWidth, WindowHeight, 0, SDL_OPENGL | SDL_RESIZABLE) == NULL)
return 2;
Init();
while (!quit)
{
DrawScene();
while ( SDL_PollEvent(&event) )
{
if ( event.type == SDL_VIDEORESIZE)
{
Resize(event.resize.w, event.resize.h);
}
else if ( event.type == SDL_MOUSEBUTTONDOWN || event.type == SDL_MOUSEBUTTONUP )
{
MouseClick(event.button.button, event.button.state, event.button.x, WindowHeight - event.button.y);
printf("event.button (%i, %i)\n", event.button.x, event.button.y);
MouseHandler();
}
else if ( event.type == SDL_MOUSEMOTION )
{
MouseMove(event.motion.x, WindowHeight - event.motion.y);
printf("event.motion (%i, %i)\n", event.motion.x, event.motion.y);
MouseHandler();
}
else if (event.type == SDL_QUIT)
quit |= true;
}
quit |= KeyboardHandler();
SDL_Delay(10);
}
SDL_Quit();
return 0;
}