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Microsoft Windows NT Build 511 (SDK Final Release) 07-24-1993
/******************************************************************************\
* This is a part of the Microsoft Source Code Samples.
* Copyright (C) 1993 Microsoft Corporation.
* All rights reserved.
* This source code is only intended as a supplement to
* Microsoft Development Tools and/or WinHelp documentation.
* See these sources for detailed information regarding the
* Microsoft samples programs.
\******************************************************************************/
/**************************************************************************\
* wxform.c -- sample program demonstrating the new "World Transform."
*
* design: There are a few global handles or pointers in this application,
* and different routines to operate on them. The obvious case of this
* is the three window handles and their associated window procedures.
* There is also a unique pointer to a track object and a routine to
* operate on it (i.e. doTrackObject). All communication is accomplished
* by sending messages between these procedures. Each window procedure,
* and the track object procedure, operate on some set of messages which
* include some of the standard Windows messages, and also miscellaneous
* "WM_USER" messages (c.f. wxform.h).
\**************************************************************************/
#include <windows.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <limits.h>
#include "wxform.h"
/**************************************************************************\
*
* function: WinMain()
*
* input parameters: c.f. generic sample
*
\**************************************************************************/
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
MSG msg;
HICON hicon;
UNREFERENCED_PARAMETER( lpCmdLine );
/* Check for previous instance. If none, then register class. */
if (!hPrevInstance) {
WNDCLASS wc;
wc.style = 0;
wc.lpfnWndProc = (WNDPROC)MainWndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(hInstance, "TransformIcon");
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = GetStockObject(LTGRAY_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = "wxform";
if (!RegisterClass(&wc)) return (FALSE);
} /* class registered o.k. */
/* Create the main window. Return false if CreateWindow() fails */
hInst = hInstance;
hwndMain = CreateWindow(
"wxform",
"World Transform Demonstration",
WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
if (!hwndMain) return (FALSE);
ShowWindow(hwndMain, nCmdShow);
UpdateWindow(hwndMain);
/* create a new track object and paint it for the first time. */
ptoRect = doTrackObject(NULL, TROB_NEW, hwndMain, 0);
doTrackObject(ptoRect, TROB_PAINT, hwndMain, 0);
/* load and display dialog for the world transform matrix.
* then fill its entry fields. Also, get the HICON from the
* main window and fill it into the dialog's class structure
* for this application.
*/
hwndTransform = CreateDialog(hInst, "TransformDlg",
hwndMain, (DLGPROC)TransformDlgProc);
hicon = (HICON) GetClassLong (hwndMain, GCL_HICON);
SetClassLong (hwndTransform, GCL_HICON, (LONG)hicon);
showTransform = TRUE;
SendMessage (hwndTransform, WM_PUTUPFLOATS, 0, (LONG) &ptoRect->xfmChange);
/* load and display the dialog for the mouse position.
* minimize it initially.
*/
hwndMouse = CreateDialog(hInst, "MouseDlg",
hwndMain, (DLGPROC)MouseDlgProc);
ShowWindow (hwndMouse, SW_SHOWMINIMIZED);
showMouse = FALSE;
/* load and display the dialog with the direct manipulation help.
* minimize it initially. (Don't need a unique window procedure.)
*/
hwndHelp = CreateDialog(hInst, "helpDlg", hwndMain, NULL);
ShowWindow (hwndHelp, SW_SHOWMINIMIZED);
/* Loop getting messages and dispatching them. */
while (GetMessage(&msg,NULL, 0,0)) {
if (!IsDialogMessage (hwndTransform, &msg))
if (!IsDialogMessage (hwndMouse, &msg))
if (!IsDialogMessage (hwndHelp, &msg)){
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (msg.wParam);
}
/**************************************************************************\
*
* function: MainWndProc()
*
* input parameters: normal window procedure parameters.
*
* global variables:
* hwndTransform,
* hwndMouse - information dialog box window handles.
* showTransform,
* showMouse - Booleans recording the retore/minimize state of the dialogs.
* ptoRect - pointer to track object in middle of screen.
*
\**************************************************************************/
LRESULT CALLBACK MainWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HANDLE hPenGrid;
switch (message) {
/**********************************************************************\
* WM_CREATE
*
* create a pen for later use.
\**********************************************************************/
case WM_CREATE:
hPenGrid = CreatePen (PS_SOLID, 1, GRIDCOLOR);
break;
/**********************************************************************\
* WM_DESTROY
*
* Complement of WM_CREATE. send the track object the delete messages,
* then call PostQuitMessage.
\**********************************************************************/
case WM_DESTROY:
DeleteObject(hPenGrid);
doTrackObject(ptoRect, TROB_DELETE, hwnd, lParam);
PostQuitMessage(0);
break;
/**********************************************************************\
* WM_SIZE
*
* Invalidate the whole window because we reset the origin on paint
* messages according to the size. Also, send the track object a
* message so that it will also change its HDC's viewport origin.
\**********************************************************************/
case WM_SIZE:
InvalidateRect (hwnd, NULL, TRUE);
doTrackObject (ptoRect, TROB_CENTER, hwnd, lParam);
break;
/**********************************************************************\
* WM_PAINT
*
* First invalidate the whole window (forces the object to be painted
* fresh, and thus it won't XOR its old self out). Then draw the
* grid and finally draw the object.
\**********************************************************************/
case WM_PAINT : {
PAINTSTRUCT ps;
HDC hdc;
RECT rect;
POINT point;
int i;
InvalidateRect (hwnd, NULL, TRUE);
hdc = BeginPaint(hwnd, &ps);
CenterOrigin (hwnd, hdc);
GetClientRect (hwnd, &rect);
GetViewportOrgEx(hdc, &point);
OffsetRect(&rect, -point.x, -point.y );
/* Draw vertical lines. Draw three at the origin. */
SelectObject(hdc, hPenGrid);
for (i = 0; i<= rect.right; i+=TICKSPACE){
MoveToEx (hdc, i, rect.top, NULL);
LineTo (hdc, i, rect.bottom);
MoveToEx (hdc, -i, rect.top, NULL);
LineTo (hdc, -i, rect.bottom);
}
MoveToEx (hdc, -1, rect.top, NULL);
LineTo (hdc, -1, rect.bottom);
MoveToEx (hdc, 1, rect.top, NULL);
LineTo (hdc, 1, rect.bottom);
/* Draw horizontal lines. Draw three at the origin. */
for (i = 0; i<= rect.bottom; i+=TICKSPACE){
MoveToEx (hdc, rect.left, i, NULL);
LineTo (hdc, rect.right, i);
MoveToEx (hdc, rect.left, -i, NULL);
LineTo (hdc, rect.right, -i);
}
MoveToEx (hdc, rect.left, -1, NULL);
LineTo (hdc, rect.right, -1);
MoveToEx (hdc, rect.left, 1, NULL);
LineTo (hdc, rect.right, 1);
doTrackObject(ptoRect, TROB_PAINT, hwnd, lParam);
EndPaint (hwnd, &ps);
} break;
/**********************************************************************\
* WM_LBUTTONDOWN & WM_RBUTTONDOWN
* On button down messages, hittest on the track object, and if
* it returns true, then send these messages to the track object.
\**********************************************************************/
case WM_RBUTTONDOWN:
case WM_LBUTTONDOWN:
if (doTrackObject(ptoRect, TROB_HITTEST, hwnd, lParam))
doTrackObject(ptoRect, message, hwnd, lParam);
break;
/**********************************************************************\
* WM_LBUTTONUP & WM_RBUTTONDOWN & MW_MOUSEMOVE
* If the track object is in a "tracking mode" then send it these messages.
* If the transform dialog is not minimized, fill it with numbers.
* If the mouse dialog is not minimized, fill it with numbers.
\**********************************************************************/
case WM_RBUTTONUP:
case WM_LBUTTONUP:
case WM_MOUSEMOVE:
if (ptoRect->Mode) {
doTrackObject(ptoRect, message, hwnd, lParam);
if (showTransform)
SendMessage (hwndTransform, WM_PUTUPFLOATS, 0,
(LONG) &ptoRect->xfmChange);
}
if (showMouse)
SendMessage (hwndMouse, WM_PUTUPFLOATS, (DWORD) hwnd, lParam);
break;
} /* end switch */
return (DefWindowProc(hwnd, message, wParam, lParam));
}
/**************************************************************************\
*
* function: TransformDlgProc()
*
* input parameters: normal window procedure parameters.
*
* global variables:
* showTransform - TRUE if window is restored, FALSE if minimized.
* maintain the value in this routine for other windows' use.
* ptoRect - pointer to the track object.
* showMouse, hwndMain.
*
* nonstandard messages:
* WM_PUTUPFLOATS - fill the entry fields with the contents of an XFORM.
\**************************************************************************/
LRESULT CALLBACK TransformDlgProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
XFORM xform;
char buffer[MAXCHARS];
switch (message) {
/**********************************************************************\
* WM_INITDIALOG
*
* Fill the entry fields with sensible original values.
\**********************************************************************/
case WM_INITDIALOG:
SetDlgItemText(hwnd, IDD_13, "0");
SetDlgItemText(hwnd, IDD_23, "0");
SetDlgItemText(hwnd, IDD_33, "1");
return TRUE;
/******************************************************************\
* WM_PUTUPFLOATS
*
* lParam - pointer to an XFORM structure.
* fill the entry fields with the XFORM values.
\******************************************************************/
case WM_PUTUPFLOATS: {
PXFORM pxform;
pxform = (PXFORM) lParam;
sprintf (buffer, FORMATFLOAT,pxform->eM11);
SetDlgItemText(hwnd, IDD_EM11, buffer);
sprintf (buffer, FORMATFLOAT,pxform->eM12);
SetDlgItemText(hwnd, IDD_EM12, buffer);
sprintf (buffer, FORMATFLOAT,pxform->eDx);
SetDlgItemText(hwnd, IDD_EDX, buffer);
sprintf (buffer, FORMATFLOAT,pxform->eM21);
SetDlgItemText(hwnd, IDD_EM21, buffer);
sprintf (buffer, FORMATFLOAT,pxform->eM22);
SetDlgItemText(hwnd, IDD_EM22, buffer);
sprintf (buffer, FORMATFLOAT,pxform->eDy);
SetDlgItemText(hwnd, IDD_EDY, buffer);
} return FALSE;
/******************************************************************\
* WM_SIZE
*
* toggle the global variable keeping track of the iconized state
* of this window.
\******************************************************************/
case WM_SIZE :
if (wParam == SIZEICONIC)
showTransform = FALSE;
else {
showTransform = TRUE;
SendMessage (hwnd, WM_PUTUPFLOATS, 0, (LONG) &ptoRect->xfmChange);
}
return FALSE;
case WM_COMMAND:
/******************************************************************\
* WM_COMMAND, IDD_SETXFORM
*
* take the values from the entry field, fill them into an XFORM
* structure and then send the track object the message to use
* these values. Finally, reformat and repaint the entry fields.
\******************************************************************/
if (LOWORD(wParam) == IDD_SETXFORM) {
GetDlgItemText(hwnd, IDD_EM11, buffer, MAXCHARS);
xform.eM11 = (float) atof (buffer);
GetDlgItemText(hwnd, IDD_EM12, buffer, MAXCHARS);
xform.eM12 = (float) atof (buffer);
GetDlgItemText(hwnd, IDD_EDX, buffer, MAXCHARS);
xform.eDx = (float) atof (buffer);
GetDlgItemText(hwnd, IDD_EM21, buffer, MAXCHARS);
xform.eM21 = (float) atof (buffer);
GetDlgItemText(hwnd, IDD_EM22, buffer, MAXCHARS);
xform.eM22 = (float) atof (buffer);
GetDlgItemText(hwnd, IDD_EDY, buffer, MAXCHARS);
xform.eDy = (float) atof (buffer);
// HACK. The WM_SIZE here is used to flush the GDI buffer in order
// to eliminate a very strange bug whereby DPtoLP() doesn't work.
if (showMouse) SendMessage (hwndMain, WM_SIZE, 0,0);
doTrackObject (ptoRect, TROB_SETXFORM, hwnd, (LONG) &xform);
SendMessage (hwnd, WM_PUTUPFLOATS, 0, (LONG) &xform);
/******************************************************************\
* WM_COMMAND, IDD_IDENTITY
*
* fill a local XFORM structure with the identity matrix. Now
* send the track object the message to use these values.
* Finally, reformat and repaint the entry fields.
\******************************************************************/
} else if (LOWORD(wParam) == IDD_IDENTITY) {
xform.eM11 =
xform.eM22 = (float) 1.0;
xform.eDx =
xform.eDy =
xform.eM12 =
xform.eM21 = (float) 0.0;
// HACK. The WM_SIZE here is used to flush the GDI buffer in order
// to eliminate a very strange bug whereby DPtoLP() doesn't work.
if (showMouse) SendMessage (hwndMain, WM_SIZE, 0,0);
doTrackObject (ptoRect, TROB_SETXFORM, hwnd, (LONG) &xform);
SendMessage (hwnd, WM_PUTUPFLOATS, 0, (LONG) &xform);
} /* end WM_COMMAND */
return FALSE;
} /* end switch */
return FALSE;
}
/**************************************************************************\
*
* function: MouseDlgProc()
*
* input parameters: normal window procedure parameters.
*
* global variables:
* showMouse -- TRUE if window is restored, FALSE if minimized.
* maintain the value in this routine for other windows' use.
* ptoRect - pointer to the track object. Needed for DPtoLP()
*
* nonstandard messages:
* WM_PUTUPFLOATS - fill the entry fields with the mouse position.
*
\**************************************************************************/
LRESULT CALLBACK MouseDlgProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
char buffer[MAXCHARS];
switch (message) {
/******************************************************************\
* WM_PUTUPFLOATS
*
* wParam - contains the hwnd for the main window.
* lParam - contains the mouse position in device coordinates.
* (c.f. WM_MOUSEMOVE)
\******************************************************************/
case WM_PUTUPFLOATS: {
POINT pScreen, pWorld;
HWND hwndMain;
hwndMain = (HWND) wParam;
pScreen.x = pWorld.x = LOWORD(lParam);
pScreen.y = pWorld.y = HIWORD(lParam);
sprintf (buffer, "%d", pScreen.x);
SetDlgItemText(hwnd, IDD_DEVICEX, buffer);
sprintf (buffer, "%d", pScreen.y);
SetDlgItemText(hwnd, IDD_DEVICEY, buffer);
ClientToScreen (hwndMain, &pScreen);
sprintf (buffer, "%d", pScreen.x);
SetDlgItemText(hwnd, IDD_SCREENX, buffer);
sprintf (buffer, "%d", pScreen.y);
SetDlgItemText(hwnd, IDD_SCREENY, buffer);
DPtoLP (ptoRect->hdc, &pWorld, 1);
sprintf (buffer, FORMATFLOAT, (float) pWorld.x);
SetDlgItemText(hwnd, IDD_WORLDX , buffer);
sprintf (buffer, FORMATFLOAT, (float) pWorld.y);
SetDlgItemText(hwnd, IDD_WORLDY , buffer);
} return FALSE;
/******************************************************************\
* WM_SIZE
*
* toggle the global variable keeping track of the iconized state
* of this window.
\******************************************************************/
case WM_SIZE :
if (wParam == SIZEICONIC)
showMouse = FALSE;
else
showMouse = TRUE;
return FALSE;
}
return FALSE;
}
/**************************************************************************\
* function: CenterOrigin()
*
* input parameters:
* hwnd - window with client we want the center of.
* hdc - device context which we set the Viewport origin of.
*
\**************************************************************************/
VOID CenterOrigin (HWND hwnd, HDC hdc)
{
RECT rect;
POINT center;
GetClientRect (hwnd, &rect);
center.x = rect.right / 2;
center.y = rect.bottom /2;
SetViewportOrgEx (hdc, center.x, center.y, NULL);
return;
}
/**************************************************************************\
*
* function: doTrackObject()
*
* input parameters:
* pto - pointer to a track object.
* msg - message selecting what action to take. Values may include WM_*'s
* (see case statements below for more information.)
* hwnd - Window handle for the window the track object exists within.
* lParam - Usually fourth param to window proc. varies based on msg.
*
* global variables: none.
*
* coordinate spaces: There are three coordinate spaces of interest here,
* and this routine is frequently switching between them...
*
* WORLD DEVICE SCREEN
*
* object coordinates input mouse pos used w/ SetCursorPos()
* (pto->rect) (lParam for WM_*)
*
* -----> LPtoDP() ----> ----> ClientToScreen() -->
* <----- DPtoLP() <---- <---- ScreenToClient() <--
*
* in addition, the HDC has an offset origin. Device coordinates for the
* mouse (lParam) never take this into account, but it is necessary to
* translate them in order to get direct manipulation right.
*
\**************************************************************************/
PTrackObject doTrackObject(PTrackObject pto, int msg, HWND hwnd, LONG lParam)
{
if ((pto == NULL) && (msg != TROB_NEW)) return NULL;
switch (msg) {
/**********************************************************************\
* TROB_NEW
*
* Allocate new PTrackObject structure. Fill in default values
* for the fields of the structure. Set up the HDC correctly.
* return - pointer to the new object.
\**********************************************************************/
case TROB_NEW: {
PTrackObject pto;
/* with LPTR returned value is a pointer. */
pto = (PTrackObject) LocalAlloc (LPTR, sizeof (TrackObject));
/* initialize the HDC and other fields. */
pto->hdc = GetDC(hwnd);
SetGraphicsMode (pto->hdc, GM_ADVANCED);
SetROP2(pto->hdc, R2_NOT);
SelectObject (pto->hdc, GetStockObject (NULL_BRUSH));
SelectObject(pto->hdc, CreatePen (PS_SOLID, 2, (COLORREF) 0x01000009));
pto->Mode = TMNONE;
doTrackObject (pto, TROB_CENTER, hwnd, lParam);
GetWorldTransform (pto->hdc, &(pto->xfmChange));
/* initialize the size. */
pto->rect.top = pto->rect.left = 0;
pto->rect.bottom = pto->rect.right = TICKSPACE*5;
return (pto);
}
/**********************************************************************\
* TROB_DELETE
*
* Delete the pen that we created, release the DC,
* free up the memory allocated for the object.
\**********************************************************************/
case TROB_DELETE:
DeleteObject (SelectObject (pto->hdc, GetStockObject (BLACK_PEN)));
doTrackObject (pto, TROB_PAINT, hwnd, lParam);
ReleaseDC (hwnd, pto->hdc);
LocalFree (LocalHandle ((LPSTR)pto));
return NULL;
/**********************************************************************\
* TROB_CENTER
*
* Called in order to reset the view port origin in the track objects
* hdc whenever the client window changes size. This hdc is thus kept
* synchronized with the hdc that the axes are painted into.
\**********************************************************************/
case TROB_CENTER: {
CenterOrigin (hwnd, pto->hdc);
return (pto);
}
/**********************************************************************\
* TROB_PAINT
*
* Paint the object into its hdc. Called half the time to erase
* the object, and half the time to redraw it.
\**********************************************************************/
case TROB_PAINT: {
Rectangle (pto->hdc, pto->rect.left+1, pto->rect.top+1,
pto->rect.left+INC, pto->rect.top+INC);
Rectangle (pto->hdc, pto->rect.left, pto->rect.top,
pto->rect.right, pto->rect.bottom);
} return NULL;
/**********************************************************************\
* TROB_SETXFORM
*
* lParam - pointer to the new transform.
* set the new transform into the HDC, then update xfmChange.
\**********************************************************************/
case TROB_SETXFORM: {
doTrackObject (pto, TROB_PAINT, hwnd, lParam);
SetWorldTransform(pto->hdc, (PXFORM) lParam);
GetWorldTransform(pto->hdc, &pto->xfmChange);
doTrackObject (pto, TROB_PAINT, hwnd, lParam);
} return NULL;
/**********************************************************************\
* TROB_HITTEST
*
* Check the point sent in in the lParam to see if it lays within
* the bounds of the objects defining rectangle.
* return - pointer to the object iff the point is in rectangle,
* otherwise return NULL.
\**********************************************************************/
case TROB_HITTEST:{
POINT mouWorld;
mouWorld.x = LOWORD(lParam);
mouWorld.y = HIWORD(lParam);
DPtoLP (pto->hdc, &mouWorld, 1);
if (PtInRect (&pto->rect, mouWorld)) return pto;
else return NULL;
}
/**********************************************************************\
* WM_LBUTTONDOWN & WM_RBUTTONDOWN
*
* Capture the mouse, set the tracking mode depending on the mouse
* location in world coordinates, reset the mouse position.
*
\**********************************************************************/
case WM_LBUTTONDOWN:
case WM_RBUTTONDOWN: {
POINT newmouScreen;
POINT mouWorld;
mouWorld.x = LOWORD(lParam);
mouWorld.y = HIWORD(lParam);
DPtoLP (pto->hdc, &mouWorld, 1);
/* upper left hand corner. right button is no-op. */
if ((mouWorld.x <= (pto->rect.right / 2)) &&
(mouWorld.y <= (pto->rect.bottom / 2))) {
if (msg == WM_RBUTTONDOWN) return NULL;
pto->Mode = TMMOVE;
newmouScreen.x = pto->rect.left;
newmouScreen.y = pto->rect.top;
/* lower left hand corner */
} else if ((mouWorld.x <= (pto->rect.right / 2)) &&
(mouWorld.y > (pto->rect.bottom / 2))) {
pto->Mode = (msg == WM_RBUTTONDOWN) ? TMSHEARY : TMSIZEY;
newmouScreen.x = pto->rect.left;
newmouScreen.y = pto->rect.bottom;
/* upper right hand corner */
} else if ((mouWorld.x > (pto->rect.right / 2)) &&
(mouWorld.y <= (pto->rect.bottom / 2))) {
pto->Mode = (msg == WM_RBUTTONDOWN) ? TMSHEARX : TMSIZEX;
newmouScreen.x = pto->rect.right;
newmouScreen.y = pto->rect.top;
/* lower right hand corner */
} else if ((mouWorld.x > (pto->rect.right / 2)) &&
(mouWorld.y > (pto->rect.bottom / 2))) {
pto->Mode = (msg == WM_RBUTTONDOWN) ? TMROTATE : TMSIZEXY;
newmouScreen.x = pto->rect.right;
newmouScreen.y = pto->rect.bottom;
}
SetCapture(hwnd);
LPtoDP (pto->hdc, &newmouScreen, 1);
ClientToScreen (hwnd, &newmouScreen);
SetCursorPos (newmouScreen.x,newmouScreen.y);
GetWorldTransform (pto->hdc, &pto->xfmDown);
} return NULL;
/**********************************************************************\
* WM_MOUSEMOVE
*
* this is where almost all of the interesting calculation is done.
* First clip the mouse location to be in client rectangle, then
* call MouseMove() to handle the different tracking modes.
\**********************************************************************/
case WM_MOUSEMOVE: {
RECT rect;
GetClientRect (hwnd, &rect);
if ((short) LOWORD(lParam) < (short)rect.left)
lParam = MAKELONG ((WORD)rect.left, HIWORD(lParam));
if (LOWORD(lParam) > (WORD)rect.right)
lParam = MAKELONG ((WORD)rect.right, HIWORD(lParam));
if ((short) HIWORD(lParam) < (short)rect.top)
lParam = MAKELONG (LOWORD(lParam), (WORD)rect.top);
if (HIWORD(lParam) > (WORD)rect.bottom)
lParam = MAKELONG (LOWORD(lParam),(WORD)rect.bottom);
MouseMove (pto, msg, hwnd, lParam);
} return NULL;
/**********************************************************************\
* WM_RBUTTONUP & WM_LBUTTONUP
*
* simply release the mouse capture, and set the mode to TMNONE.
\**********************************************************************/
case WM_RBUTTONUP:
case WM_LBUTTONUP: {
if (pto->Mode) {
ReleaseCapture();
pto->Mode = TMNONE;
}
} return NULL;
} /* end switch(msg) */
}
/**************************************************************************\
* function: MouseMove()
*
* input parameters:
* pto - pointer to a track object.
* msg - not used.
* hwnd - Window handle for the window the track object exists within.
* lParam - Usually fourth param to window proc. varies based on msg.
*
* The tracking behavior which the user observers when moving the mouse
* is based on the current tracking mode of the object. This is usually
* determined on the mouse down event (c.f. TM*). First erase the old
* object, then figure out the change to the transform matrix, finally
* change the world transform matrix and redraw the object.
*
* Tranform:
* ( eM11 eM12 0 )
* ( eM21 eM22 0 )
* ( eDx eDy 1 )
*
* xDevice = (xWorld * eM11) + (yWorld * eM21) + eDx
* yDevice = (xWorld * eM12) + (yWorld * eM22) + eDy
*
* In this routine the Device (mouse location) and World (rectangle corner)
* points are known. Therefore, the two equations above are solved for
* the desired matrix entry value (e.g. eM11, 1M12, ... eDy). The tracking
* mode determines which one of these entries may be changed. E.g. scaling
* in X modifies eM11 while shearing in X modifies eM12. So rather than
* using the world transform to map from world to device points, we are
* back-computing the proper contents of the world transform.
*
\**************************************************************************/
VOID MouseMove(PTrackObject pto, int msg, HWND hwnd, LONG lParam)
{
POINT mouWorld, mouDevice, orgDevice;
UNREFERENCED_PARAMETER(msg);
doTrackObject(pto, TROB_PAINT, hwnd, lParam);
mouDevice.x = mouWorld.x = LOWORD(lParam);
mouDevice.y = mouWorld.y = HIWORD(lParam);
SetWorldTransform(pto->hdc, &pto->xfmDown);
DPtoLP (pto->hdc, &mouWorld, 1);
/* offset the mouse device point for the viewport's origin. */
GetViewportOrgEx (pto->hdc, &orgDevice);
mouDevice.x -= orgDevice.x;
mouDevice.y -= orgDevice.y;
GetWorldTransform(pto->hdc, &pto->xfmChange);
switch (pto->Mode) {
/*******************************************************\
* ( 1 xShear 0 )
* ( 0 1 0 )
* ( 0 0 1 )
*
* xWorld = rect.left == 0;
\*******************************************************/
case TMSHEARX: {
pto->xfmChange.eM12 = (float) mouDevice.y;
pto->xfmChange.eM12 -=pto->xfmChange.eDy;
pto->xfmChange.eM12 /=(float) pto->rect.right ;
SetWorldTransform (pto->hdc, &pto->xfmChange);
} break;
/*******************************************************\
* ( 1 0 0 )
* ( yShear 1 0 )
* ( 0 0 1 )
*
* yWorld = rect.top == 0;
\*******************************************************/
case TMSHEARY: {
pto->xfmChange.eM21 = (float) mouDevice.x;
pto->xfmChange.eM21 -=pto->xfmChange.eDx;
pto->xfmChange.eM21 /=(float) pto->rect.bottom ;
SetWorldTransform (pto->hdc, &pto->xfmChange);
} break;
/*******************************************************\
* ( cos(a) -sin(a) 0 )
* ( sin(a) cos(a) 0 )
* ( 0 0 1 )
*
* a == rotation angle. Since mouse in in lower right,
* we need to shift this back 45 degrees (assuming that
* straight down is 0 degrees). Thus we actually compute
* cos(a) = cos(b - 45) = cos(b)sin(45) + cos(45)sin(45)
* where b is angle from the origin to the mouse (x,y)
* cos(45) = sin(45) ~= 0.707107
* cos(b) = y/r sin(b) = x/r
*
\*******************************************************/
case TMROTATE: {
float r;
/* translate back to the origin. */
pto->xfmChange.eDx = pto->xfmChange.eDy = (float)0.0;
SetWorldTransform (pto->hdc, &pto->xfmChange);
/* rotate about the origin. */
r = (float) sqrt( (double)(mouWorld.x * mouWorld.x) +
(double)(mouWorld.y * mouWorld.y));
pto->xfmChange.eM11 = (float) mouWorld.y / r;
pto->xfmChange.eM11 += (float) mouWorld.x / r;
pto->xfmChange.eM11 *= (float) 0.707107;
pto->xfmChange.eM22 = pto->xfmChange.eM11;
pto->xfmChange.eM12 = (float) mouWorld.y / r;
pto->xfmChange.eM12 -= (float) mouWorld.x / r;
pto->xfmChange.eM12 *= (float) 0.707107;
pto->xfmChange.eM21 = -pto->xfmChange.eM12;
pto->xfmChange.eDx = pto->xfmChange.eDy = (float)0.0;
ModifyWorldTransform (pto->hdc, &pto->xfmChange, MWT_RIGHTMULTIPLY);
/* translate back to the original offset. */
pto->xfmChange.eM11 =
pto->xfmChange.eM22 = (float) 1.0;
pto->xfmChange.eM12 =
pto->xfmChange.eM21 = (float) 0.0;
pto->xfmChange.eDx = pto->xfmDown.eDx;
pto->xfmChange.eDy = pto->xfmDown.eDy;
ModifyWorldTransform (pto->hdc, &pto->xfmChange, MWT_RIGHTMULTIPLY);
GetWorldTransform (pto->hdc, &pto->xfmChange);
} break;
/*******************************************************\
* ( Size X 0 0 )
* ( 0 Size Y 0 )
* ( 0 0 1 )
*
\*******************************************************/
case TMSIZEXY: {
pto->xfmChange.eM11 = (float) mouDevice.x;
pto->xfmChange.eM11 -=pto->xfmChange.eDx;
pto->xfmChange.eM11 -=((float) pto->rect.bottom * pto->xfmChange.eM21);
pto->xfmChange.eM11 /=(float) pto->rect.right ;
pto->xfmChange.eM22 = (float) mouDevice.y;
pto->xfmChange.eM22 -=pto->xfmChange.eDy;
pto->xfmChange.eM22 -=((float) pto->rect.right * pto->xfmChange.eM12);
pto->xfmChange.eM22 /=(float) pto->rect.bottom ;
SetWorldTransform (pto->hdc, &pto->xfmChange);
} break;
/*******************************************************\
* ( Size X 0 0 )
* ( 0 1 0 )
* ( 0 0 1 )
*
* yWorld = rect.top == 0;
\*******************************************************/
case TMSIZEX: {
pto->xfmChange.eM11 = (float) mouDevice.x;
pto->xfmChange.eM11 -=pto->xfmChange.eDx;
pto->xfmChange.eM11 /=(float) pto->rect.right ;
SetWorldTransform (pto->hdc, &pto->xfmChange);
} break;
/*******************************************************\
* ( 1 0 0 )
* ( 0 Size Y 0 )
* ( 0 0 1 )
*
* xWorld = rect.left == 0;
\*******************************************************/
case TMSIZEY: {
pto->xfmChange.eM22 = (float) mouDevice.y;
pto->xfmChange.eM22 -=pto->xfmChange.eDy;
pto->xfmChange.eM22 /=(float) pto->rect.bottom ;
SetWorldTransform (pto->hdc, &pto->xfmChange);
} break;
/*******************************************************\
* ( 1 0 0 )
* ( 0 1 0 )
* ( Move x Move y 1 )
*
* xWorld = rect.left == 0;
* yWorld = rect.top == 0;
\*******************************************************/
case TMMOVE: {
pto->xfmChange.eDx = (float) mouDevice.x ;
pto->xfmChange.eDy = (float) mouDevice.y ;
SetWorldTransform (pto->hdc, &pto->xfmChange);
} break;
} /* end switch */
doTrackObject(pto, TROB_PAINT, hwnd, lParam);
return;
}
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