POLYWIN.CPP
/*
* POLYWIN.CPP
* Polyline Component Chapter 19
*
* Window procedure for the polyline drawing window and support
* functions.
*
* Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
*
* Kraig Brockschmidt, Microsoft
* Internet : kraigb@microsoft.com
* Compuserve: >INTERNET:kraigb@microsoft.com
*/
#include "polyline.h"
/*
* PolylineWndProc
*
* Purpose:
* Window procedure for the polyline drawing window.
*/
LRESULT APIENTRY PolylineWndProc(HWND hWnd, UINT iMsg
, WPARAM wParam, LPARAM lParam)
{
PCPolyline ppl;
PAINTSTRUCT ps;
HDC hDC;
POINTS pt;
RECT rc;
ppl=(PCPolyline)GetWindowLong(hWnd, PLWL_STRUCTURE);
switch (iMsg)
{
case WM_CREATE:
ppl=(PCPolyline)((LPCREATESTRUCT)lParam)->lpCreateParams;
SetWindowLong(hWnd, PLWL_STRUCTURE, (LONG)ppl);
//CHAPTER19MOD
//Moved call to New() to Init.
ppl->m_hWnd=hWnd;
//End CHAPTER19MOD
break;
case WM_PAINT:
hDC=BeginPaint(hWnd, &ps);
//CHAPTER19MOD
//Modified Draw a little
GetClientRect(hWnd, &rc);
ppl->Draw(hDC, FALSE, TRUE, &rc, NULL);
//End CHAPTER19MOD
EndPaint(hWnd, &ps);
break;
case WM_LBUTTONDOWN:
//Stop if we are already at the limit.
if (CPOLYLINEPOINTS==ppl->m_pl.cPoints)
{
MessageBeep(0);
break;
}
//Convert the points into 0-32767 range
GetClientRect(hWnd, &rc);
pt=MAKEPOINTS(lParam);
ppl->PointScale(&rc, &pt, FALSE);
ppl->m_pl.rgpt[ppl->m_pl.cPoints++]=pt;
//Draw the lines to this new point only.
hDC=GetDC(hWnd);
//CHAPTER19MOD
ppl->Draw(hDC, FALSE, FALSE, &rc, NULL);
//End CHAPTER19MOD
ReleaseDC(hWnd, hDC);
if (NULL!=ppl->m_pAdv)
ppl->m_pAdv->OnPointChange();
//CHAPTER19MOD
//Notifications necessary to support compound documents.
ppl->SendAdvise(OBJECTCODE_DATACHANGED);
//End CHAPTER19MOD
break;
default:
return DefWindowProc(hWnd, iMsg, wParam, lParam);
}
return 0L;
}
/*
* CPolyline::Draw
*
* Purpose:
* Paints the current line in the polyline window.
*
* Parameters:
* hDC HDC to draw on, a metafile or printer DC.
* fMetafile BOOL indicating if hDC is a metafile or not,
* so we can avoid operations that RIP.
* fEntire BOOL indicating if we should draw the entire
* figure or not.
* pRect LPRECT defining the bounds in which to draw.
* ppl PPOLYLINEDATA to draw. If NULL, use current.
*
* Return Value:
* None
*/
void CPolyline::Draw(HDC hDC, BOOL fMetafile, BOOL fEntire
, LPRECT pRect, PPOLYLINEDATA ppl)
{
//CHAPTER19MOD
HBRUSH hBrush;
HPEN hPen;
HGDIOBJ hObj1, hObj2;
UINT i, j;
int nDC;
POINTS pt1,pt2;
POINT rgpt[CPOLYLINEPOINTS];
if (NULL==ppl)
ppl=&m_pl;
nDC=SaveDC(hDC);
for (i=0; i < ppl->cPoints; i++)
{
rgpt[i].x=ppl->rgpt[i].x;
rgpt[i].y=ppl->rgpt[i].y;
}
//Printer and frozen differences handled in IViewObject::Draw
hPen=CreatePen(ppl->iLineStyle, 1, ppl->rgbLine);
hObj1=SelectObject(hDC, hPen);
hBrush=CreateSolidBrush(ppl->rgbBackground);
hObj2=SelectObject(hDC, hBrush);
SetBkColor(hDC, ppl->rgbBackground);
/*
* Either draw the entire figure or just a single point. The
* entire figure also includes erasing the background completely,
* since hDC may be a metafile DC. Drawing a single point just
* updates the figure for that new point.
*/
if (fEntire || 0==ppl->cPoints)
{
//Erase the background for bitmaps and metafiles.
SelectObject(hDC, GetStockObject(NULL_PEN));
Rectangle(hDC, pRect->left, pRect->top, pRect->right+1
, pRect->bottom+1);
SelectObject(hDC, hPen);
/*
* If we are drawing the entire figure, then loop through
* each point drawing a line to each successive point.
*/
for (i=0; i < ppl->cPoints; i++)
{
for (j=i; j < ppl->cPoints; j++)
{
pt1.x=(short)rgpt[i].x;
pt1.y=(short)rgpt[i].y;
pt2.x=(short)rgpt[j].x;
pt2.y=(short)rgpt[j].y;
PointScale(pRect, &pt1, TRUE);
PointScale(pRect, &pt2, TRUE);
MoveToEx(hDC, pt1.x, pt1.y, NULL);
LineTo(hDC, pt2.x, pt2.y);
}
}
}
else
{
/*
* If we are only drawing the last point, just cycle once
* through previous points.
*/
//Get the last point entered in the array.
j=ppl->cPoints-1;
pt1.x=(short)rgpt[j].x;
pt1.y=(short)rgpt[j].y;
PointScale(pRect, &pt1, TRUE);
for (i=0; i < j; i++)
{
pt2.x=(short)rgpt[i].x;
pt2.y=(short)rgpt[i].y;
PointScale(pRect, &pt2, TRUE);
MoveToEx(hDC, pt1.x, pt1.y, NULL);
LineTo(hDC, pt2.x, pt2.y);
}
}
//If we have one point, draw a dot to indicate it's position.
if (1==ppl->cPoints)
{
pt1.x=(short)rgpt[0].x;
pt1.y=(short)rgpt[0].y;
PointScale(pRect, &pt1, TRUE);
SetPixel(hDC, pt1.x, pt1.y, m_pl.rgbLine);
}
SelectObject(hDC, hObj1);
SelectObject(hDC, hObj2);
DeleteObject(hBrush);
DeleteObject(hPen);
RestoreDC(hDC, nDC);
return;
//End CHAPTER19MOD
}
/*
* CPolyline::PointScale
*
* Purpose:
* Scales a point to or from a relative window coordinate to a
* 0-32767 coordinate.
*
* Parameters:
* pRect LPRECT of the window.
* ppt LPPOINTS to convert
* fScaleToWindow BOOL indicating direction of scaling.
*
* Return Value:
* None
*/
void CPolyline::PointScale(LPRECT pRect, LPPOINTS ppt
, BOOL fScaleToWindow)
{
DWORD cx, cy;
//Window size
cx=(DWORD)(pRect->right-pRect->left);
cy=(DWORD)(pRect->bottom-pRect->top);
//Prevent crashes
if (0L==cx) cx=1;
if (0L==cy) cy=1;
//Must use DWORD to insure proper scaling.
//CHAPTER19MOD
/*
* As an in-proc server we may not have a rectangle where the
* top left was (0,0) which was always true when we drew to
* a Polyline window. But this may be a container's hDC in
* which case we'd better place the points in the container's
* rectangle. That is, we have to add/subtract pRect->left
* and ->top in these calculations.
*/
if (fScaleToWindow)
{
ppt->x=pRect->left+(UINT)(((DWORD)ppt->x*cx) >> 15);
ppt->y=pRect->top+(UINT)(((DWORD)ppt->y*cy) >> 15);
}
else
{
ppt->x=(UINT)(((DWORD)(ppt->x - pRect->left) << 15)/cx);
ppt->y=(UINT)(((DWORD)(ppt->y - pRect->top) << 15)/cy);
}
//End CHAPTER19MOD
return;
}
//CHAPTER19MOD
/*
* PolyDlgProc
*
* Purpose:
* Dialog procedure for a window in which to display the Polyline
* for editing. This pretty much handles all editing functionality
* for the embedded object.
*/
BOOL APIENTRY PolyDlgProc(HWND hDlg, UINT iMsg
, WPARAM wParam, LPARAM lParam)
{
PCPolyline ppl=NULL;
HWND hWnd;
RECT rc;
POINT pt;
UINT uID, uTemp;
UINT cx, cy;
#ifdef WIN32
ppl=(PCPolyline)GetProp(hDlg, PROP_POINTER);
#else
WORD w1, w2;
w1=(WORD)GetProp(hDlg, PROP_SELECTOR);
w2=(WORD)GetProp(hDlg, PROP_OFFSET);
ppl=(PCPolyline)MAKELP(w1, w2);
#endif
switch (iMsg)
{
case WM_INITDIALOG:
ppl=(PCPolyline)lParam;
ppl->m_hDlg=hDlg;
#ifdef WIN32
//Properties are 32-bits in Win32
SetProp(hDlg, PROP_POINTER, (HANDLE)ppl);
#else
SetProp(hDlg, PROP_SELECTOR, (HANDLE)SELECTOROF(ppl));
SetProp(hDlg, PROP_OFFSET, (HANDLE)OFFSETOF(ppl));
#endif
//Create the Polyline to exactly cover the static rect.
hWnd=GetDlgItem(hDlg, ID_POLYLINERECT);
GetWindowRect(hWnd, &rc);
SETPOINT(pt, rc.left, rc.top);
ScreenToClient(hDlg, &pt);
//Set the polyline just within the black frame
SetRect(&rc, pt.x, pt.y, pt.x+(rc.right-rc.left)
, pt.y+(rc.bottom-rc.top));
InflateRect(&rc, -1, -1);
//Try to create the window.
ppl->m_pImpIPolyline->Init(hDlg, &rc, WS_CHILD | WS_VISIBLE
, ID_POLYLINE);
//Set the initial line style radiobutton.
ppl->m_pImpIPolyline->LineStyleGet(&uTemp);
CheckRadioButton(hDlg, ID_LINESOLID, ID_LINEDASHDOTDOT
, uTemp+ID_LINEMIN);
//Don't set focus--it takes it away from the container.
return FALSE;
case WM_SHOWWINDOW:
if (LOWORD(wParam))
{
//Center the dialog on the screen
cx=GetSystemMetrics(SM_CXSCREEN);
cy=GetSystemMetrics(SM_CYSCREEN);
GetWindowRect(hDlg, &rc);
SetWindowPos(hDlg, NULL, (cx-(rc.right-rc.left))/2
, (cy-(rc.bottom-rc.top))/2, 0, 0, SWP_NOZORDER
| SWP_NOSIZE);
//We didn't SetFocus from WM_INITDIALOG. Do it now.
SetFocus(GetDlgItem(hDlg, IDOK));
}
break;
case WM_COMMAND:
uID=LOWORD(wParam);
switch (uID)
{
case IDOK:
//Close the dialog, but save first.
if (NULL!=ppl)
{
//IOleObject::Close does what we want
ppl->m_pImpIOleObject->Close
(OLECLOSE_SAVEIFDIRTY);
}
break;
case ID_UNDO:
if (NULL!=ppl)
ppl->m_pImpIPolyline->Undo();
break;
case ID_COLORLINE:
case ID_COLORBACK:
if (NULL!=ppl)
{
UINT i;
COLORREF rgColors[16];
CHOOSECOLOR cc;
//Invoke the color chooser for either color
uTemp=(ID_COLORBACK==uID)
? POLYLINECOLOR_BACKGROUND
: POLYLINECOLOR_LINE;
for (i=0; i<16; i++)
rgColors[i]=RGB(0, 0, i*16);
memset(&cc, 0, sizeof(CHOOSECOLOR));
cc.lStructSize=sizeof(CHOOSECOLOR);
cc.lpCustColors=rgColors;
cc.hwndOwner=hDlg;
cc.Flags=CC_RGBINIT;
ppl->m_pImpIPolyline->ColorGet(uTemp
, &cc.rgbResult);
if (ChooseColor(&cc))
{
//rgColor is just some COLORREF pointer
ppl->m_pImpIPolyline->ColorSet(uTemp
, cc.rgbResult, rgColors);
}
}
break;
case ID_LINESOLID:
case ID_LINEDASH:
case ID_LINEDOT:
case ID_LINEDASHDOT:
case ID_LINEDASHDOTDOT:
if (NULL!=ppl)
{
ppl->m_pImpIPolyline
->LineStyleSet(uID-ID_LINEMIN, &uTemp);
}
break;
}
break;
case WM_DESTROY:
#ifdef WIN32
RemoveProp(hDlg, PROP_POINTER);
#else
RemoveProp(hDlg, PROP_SELECTOR);
RemoveProp(hDlg, PROP_OFFSET);
#endif
break;
case WM_CLOSE:
//This will do the IDOK handling, then send POLYM_CLOSE
SendCommand(hDlg, IDOK, 0, NULL);
break;
case POLYM_CLOSE:
ShowWindow(hDlg, SW_HIDE);
ppl->SendAdvise(OBJECTCODE_HIDEWINDOW);
break;
}
return FALSE;
}
//End CHAPTER19MOD