I have an OpenGL Application and want to use the mouse for a Free-Flight Camera.
The mouse should not be restricted to the Monitor boundaries...
I get the mouse-position with WM_MOUSEMOVE and stuff.
Because of the requirement of no boundaries i have to use a different system of saving my Mouse Position.
I want to save an absolute position of the mouse x and y.
To calculate the x and y I want to get a relative mouse movement each frame.
The idea is to reset the camera to a certain position und get the difference each frame.
After that i want to reset the mouse.
I want to reset the mouse position by SendInput() which uses the INPUT structure defined in winuser.h
it looks like this:
typedef struct tagINPUT
{
DWORD type;
union
{
MOUSEINPUT mi;
KEYBDINPUT ki;
HARDWAREINPUT hi;
};
} INPUT, *PINPUT, FAR* LPINPUT;
typedef struct tagMOUSEINPUT {
LONG dx;
LONG dy;
DWORD mouseData;
DWORD dwFlags;
DWORD time;
DWORD dwExtraInfo;
} MOUSEINPUT, *PMOUSEINPUT, FAR* LPMOUSEINPUT;
#include <windows.h>
#include <time.h>
class Mouse
{
int x,y,dx,dy,new_x,new_y; //mouse position variables
INPUT reset; // packet for SendInput command to reset the mouseposition
Mouse();
void Update();
void Render();
};
Mouse::Mouse()
{
reset.type = INPUT_MOUSE; // we want to send a mouse input
reset.mi.dx = reset.mi.dy = 1; // reset the position to 1,1
reset.mi.mouseData = 0; //dunno, unimportant
reset.mi.dwFlags = ( MOUSEEVENTF_MOVE || MOUSEEVENTF_ABSOLUTE ); // move the mouse || coordinates are absolute, not relative
reset.mi.time = time(NULL); // actual time
reset.mi.dwExtraInfo = GetMessageExtraInfo(); //sendinput wants that
}
void KMouse::Update()
{
// calc the new position
GetNewMousePosition(&new_x, &new_y);
dx = x - new_x; dy = y - new_y;
x = new_x; y = new_y;
//reset the mouse position
reset.mi.time = time(NULL); // get the actual time
SendInput(1,&reset,sizeof(reset));
//render a crosshair to the screen
Render();
}
anyways, the mouse position is not reset, the mouse moves slowly to the lower right corner, as if the MOUSEEVENTF_ABSOLUTE is not set.... any suggestions on that
thanks a lot
TomEn
Problem with setting Mouse Position with SendInput()
DaveRogers
POINTS pts;
pts.x = 100;
pts.y = 100;
// Get total screen coordinates
screen_x = GetSystemMetrics(SM_CXSCREEN);
screen_y = GetSystemMetrics(SM_CYSCREEN);
// Get location of window
GetWindowPlacement(hWndTable, &wp);
// MOUSEINPUT struct uses a truely bizarre coordinate system
// the screen is mapped to a scale from 0 to 65535 in both axis.
//Rectangle screen = Screen.PrimaryScreen.Bounds;
x = ( 65535 * (pts.x + wp.rcNormalPosition.left) ) / screen_x;
y = ( 65535 * (pts.y + wp.rcNormalPosition.top) ) / screen_y;
buffer[0].type = INPUT_MOUSE;
buffer[0].mi.dx = x;
buffer[0].mi.dy = y;
buffer[0].mi.mouseData = 0;
buffer[0].mi.dwFlags = (MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE);
buffer[0].mi.time = 0;
buffer[0].mi.dwExtraInfo = 0;
Leaving the time value in the struct zero makes the event happen now. I hope this helps.
If not - this wasn't my idea...
Duy Le - MSFT