Getting mouse position

Remco van Ommeren · 2012-04-26T09:31:20

I've been working on a game lately using DirectX, and I want to add some mouse controls in it. First, I tried to get the mouse data using GetCursorPos (I only need the position, not the buttons). Here's the function: POINT GetMousePos(HWND hWnd) { POINT cursorPos; GetCursorPos(&cursorPos); ScreenToClient(hWnd, &cursorPos); return cursorPos; } This made a really weird bug in the game. The mouse position was correct at the top left of the screen, but going down with the mouse creates a gap between the mouse and the given coordinates. The more I move to the right and bottom, the bigger the gap gets. For example, when my mouse is at 5,5 it displays 5,5. When my mouse is at 200,200 it displays 205,210 When my mouse is at 500,500 it displays 510,520 (These is not the data as it displays, but it comes really close) Note that the Y is growing faster than the X. After this I tried using the WM_MOUSEMOVE method, but this gave the same result. I'm only using 1 monitor and the size of the window is 1024x768 (window mode). I tested all methods on other computers and other mouses, but all give the same results. I made a texture drawing in the middle of the mouse. Here are my current codes: if(message.message == WM_MOUSEMOVE) { MousePosition = MAKEPOINTS(message.lParam); } position[21].x = MousePosition.x - 16; //Texture width = 32 position[21].y = MousePosition.y - 16; //Texture height = 32 And here's a picture of what happens (The red block is the texture that uses position[21]): and the only warning I get is: warning C4244: '=' : conversion from 'int' to 'float', possible loss of data But I don't think this should be a problem because the other methods aren't giving any warnings and get the same results. Can someone help me out?

Graphics and GPU Programming Programming

Started by VisualChaser April 21, 2012 10:32 PM

14 comments, last by TomKQT 11 years, 11 months ago

VisualChaser

400

Author

April 24, 2012 05:58 PM

I thought it worked, but it didn't. The window size is still the same :/

TomKQT

1,708

April 25, 2012 07:38 AM

That's really weird.
When you do this, the rectangle doesn't change at all (or only 1 pixel as you said before)?



RECT rc = {0, 0, 200, 100};

AdjustWindowRect(&rc, WS_OVERLAPPEDWINDOW, false);

I tried it on Vista with Aero and the rectangle changed to:
top: -28
bottom: 108
left: -8
right: 208

Which means that the window has to be 216x136 pixels.
And the function also tells you how many pixels has to be added around the client area in individual directions, it's 8 pixels for borders and 28 pixels for the title bar (on my Vista, this depends on your OS and your settings, you can change the title bar size somewhere).

VisualChaser

400

Author

April 25, 2012 09:43 AM

It changes to
Top: -1
Bottom: 101
Left: -1
Right: 201

But when I use the WS_OVERLAPPEDWINDOW (which is NOT the style my window uses), it creates a window that is so small, it has a height lower than 30 and a width lower than 100.

TomKQT

1,708

April 26, 2012 07:19 AM

I've got really no idea, sorry. Maybe someone else could step in?

Btw, what style do you use for the window?

VisualChaser

400

Author

April 26, 2012 09:10 AM

I'm using WS_OVERLAPPED | WS_SYSMENU | WS_BORDER.
I tried to change the window style to WS_OVERLAPPEDWINDOW and it worked fine with the AdjustWindowRect function.
But I want to make sure the window can't be maximized, can't be resized, and also I want to get rid of the minimize button at the top (not disable it).
How can I do this using other styles?

EDIT: Nevermind, I fixed it by changing the styles to WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU.
Everything is working now, thanks again!

TomKQT

1,708

April 26, 2012 09:31 AM

So also the mouse coordinates are accurate now?
Glad I could help, good luck with the project.

Getting mouse position

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