CODEWITHSUNDEEP
c++winapi
RobeeZ
RobeeZ

Reputation: 95

C++ WinAPI - sloppy mouse input

So, I'm making a game in C++ with OpenGL, and I want my cursor to stay in the middle of the screen.

At the start of each frame I call

POINT pt;
pt.x = 400;
pt.y = 300;
ClientToScreen(hWnd, &pt);
SetCursorPos(pt.x, pt.y);

Then, on WM_MOUSEMOVE event I do

POINT p;
GetCursorPos(&p);
ScreenToClient(hWnd, &p);
dx = p.x - 400;
dy = p.y - 300;

The window is 800x600, so I just wrote those numbers, that will be obviously changed later.

It works, but it is very sloppy. Like if some frames would be dropped.

Upvotes: 0

Views: 367

Answers (2)

Remy Lebeau
Remy Lebeau

Reputation: 597941

You can use ClipCursor() to restrict the mouse's movement. The mouse will not be able to move outside of the specified rectangle until you release it.

Upvotes: 1

Frerich Raabe
Frerich Raabe

Reputation: 94469

You could try installing a hook via SetWindowsHookEx (passing WH_MOUSE or maybe even WH_MOUSE_LL) and simply discarding all move events before the corresponding window messages even get dispatched.

Upvotes: 0

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