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From: Jack on 18 Jan 2010 08:10
Hi,

case WM_PAINT:
hDC = BeginPaint(hWnd, &PaintStruct);

SetMapMode(hDC, MM_ISOTROPIC);
SetWindowExtEx(hDC, 450,450,NULL);
SetViewportExtEx(hDC, cxClient, -cyClient, NULL);
SetViewportOrgEx(hDC, 0, cyClient, NULL);
//[snip]
...
case WM_MOUSEMOVE:
int xPos, yPos;
xPos = LOWORD(lParam);
yPos = HIWORD(lParam);
char buff[80];
sprintf (buff, "%d", xPos);
SetWindowText(editField, buff);
sprintf (buff, "%d", yPos);
SetWindowText(editField2, buff);
break;
//..

I am wondering how I can make SetWindowText report the correct coordinates
as I am using the mapping mode which starts from the lower-left corner.
Currently, +ve x goes to the right and +ve y goes downwards. I'd like to
have +ve goes upwards and
starts from the lower-left corner.
Thanks
Jack





From: Igor Tandetnik on 18 Jan 2010 11:55
Jack wrote:
> I am wondering how I can make SetWindowText report the correct coordinates
> as I am using the mapping mode which starts from the lower-left corner.

WM_MOUSEMOVE always reports physical pixels. You could use DPtoLP to convert them to logical coordinates, or just do the math yourself.
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925
From: Jack on 19 Jan 2010 03:01
Thanks
I finally used this
lets say the client height = 480
yPos = 480-yPos;
Think it works
Jack


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