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330 lines
9.7 KiB
330 lines
9.7 KiB
/****************************************************************************
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Glide.c
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June 91, JimH initial code
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Oct 91, JimH port to Win32
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Routines for gliding cards are here. There is only one public entry point
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to these routines, the function Glide().
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The glide speed can be altered by changing STEPSIZE. A large number (like
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37) makes for fast glides.
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****************************************************************************/
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#include "freecell.h"
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#include "freecons.h"
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#include <math.h> // for labs()
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#define STEPSIZE 37 // size of glide steps in pixels
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#define BGND 255 // used for cdtDrawExt
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static HDC hMemB1, hMemB2, hMemF; // mem DC associated with above bitmaps
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static HBITMAP hOB1, hOB2, hOF; // old bitmaps in above mem DCs
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static UINT dwPixel[12]; // corner pixels that are saved/restored
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static HRGN hRgn, hRgn1, hRgn2; // hRgn1 is source, hRgn2 is destination
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static VOID GlideInit(HWND hWnd, UINT fcol, UINT tcol);
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static INT IntSqrt(INT square);
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static VOID SaveCorners(HDC hDC, UINT x, UINT y);
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static VOID RestoreCorners(HDC hDC, UINT x, UINT y);
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/******************************************************************************
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Glide
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Given a from and to location, this function animates the movement of
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the card.
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******************************************************************************/
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VOID Glide(HWND hWnd, UINT fcol, UINT fpos, UINT tcol, UINT tpos)
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{
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HDC hDC;
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INT dx, dy; // total distance card travels
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UINT x1, y1, x2, y2; // start and end locations for each step
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UINT xStart, yStart; // beginning position
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UINT xEnd =0, yEnd = 0; // destination position
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INT i;
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INT distance; // distance card travles +/- 3 pixels
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INT steps; // number of steps card takes in glide total
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BOOL bSaved = FALSE; // corner pixels saved?
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if (fcol != tcol || fpos != tpos) // if card moves
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{
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hDC = GetDC(hWnd);
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hMemB1 = CreateCompatibleDC(hDC); // memory DCs for bitmaps
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hMemB2 = CreateCompatibleDC(hDC);
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hMemF = CreateCompatibleDC(hDC);
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hRgn1 = CreateRectRgn(1, 1, 2, 2);
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hRgn2 = CreateRectRgn(1, 1, 2, 2);
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hRgn = CreateRectRgn(1, 1, 2, 2);
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if (hMemB1 && hMemB2 && hMemF && hRgn1 && hRgn2 && hRgn)
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{
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hOB1 = SelectObject(hMemB1, hBM_Bgnd1);
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hOB2 = SelectObject(hMemB2, hBM_Bgnd2);
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hOF = SelectObject(hMemF, hBM_Fgnd);
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GlideInit(hWnd, fcol, fpos); // set up hBM_Bgnd1 and hBM_Fgnd
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Card2Point(fcol, fpos, &xStart, &yStart);
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Card2Point(tcol, tpos, &xEnd, &yEnd);
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SaveCorners(hDC, xEnd, yEnd);
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bSaved = TRUE;
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/* Determine how far to travel and how many steps to take. */
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x1 = xStart;
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y1 = yStart;
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dx = xEnd - xStart;
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dy = yEnd - yStart;
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distance = IntSqrt(dx*dx + dy*dy);
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if (bFastMode)
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steps = 1;
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else
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steps = distance / STEPSIZE;
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/* Determine intermediate glide locations. Long arithmetic is
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needed to prevent overflows. */
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for (i = 1; i < steps; i++)
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{
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x2 = xStart + ((i * dx) / steps);
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y2 = yStart + ((i * dy) / steps);
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GlideStep(hDC, x1, y1, x2, y2);
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x1 = x2;
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y1 = y2;
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}
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/* Erase last background manually -- DrawCard will do last card. */
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BitBlt(hMemB1, xEnd-x1, yEnd-y1, dxCrd, dyCrd, hMemF,0,0,SRCCOPY);
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BitBlt(hDC, x1, y1, dxCrd, dyCrd, hMemB1, 0, 0, SRCCOPY);
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/* Select original bitmaps so mem DCs can be destroyed. */
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SelectObject(hMemB1, hOB1);
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SelectObject(hMemB2, hOB2);
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SelectObject(hMemF, hOF);
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}
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else
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{
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LoadString(hInst, IDS_MEMORY, bigbuf, BIG);
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LoadString(hInst, IDS_APPNAME, smallbuf, SMALL);
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MessageBeep(MB_ICONHAND);
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MessageBox(hWnd, bigbuf, smallbuf, MB_OK | MB_ICONHAND);
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moveindex = 0; // don't try moving more cards
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PostQuitMessage(0);
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}
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DeleteDC(hMemB1);
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DeleteDC(hMemB2);
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DeleteDC(hMemF);
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ReleaseDC(hWnd, hDC);
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DeleteObject(hRgn);
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DeleteObject(hRgn1);
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DeleteObject(hRgn2);
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}
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/* Draw last card with DrawCard so end result guaranteed correct. */
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hDC = GetDC(hWnd);
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DrawCard(hDC, tcol, tpos, card[fcol][fpos], FACEUP);
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if (bSaved)
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RestoreCorners(hDC, xEnd, yEnd);
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ReleaseDC(hWnd, hDC);
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}
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/******************************************************************************
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GlideInit
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Blt what is under the card source location into hMemB1, and the
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card to be moved into hMemF.
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******************************************************************************/
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VOID GlideInit(HWND hWnd, UINT fcol, UINT fpos)
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{
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if (fcol == TOPROW) // if it's top row, background is ghost bitmap.
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{
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if (fpos > 3 && VALUE(card[fcol][fpos]) != ACE)
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{
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HDC hDC;
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UINT x, y;
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hDC = GetDC(hWnd);
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Card2Point(fcol, fpos, &x, &y);
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SaveCorners(hDC, x, y);
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cdtDrawExt(hMemB1,0,0,dxCrd,dyCrd,card[fcol][fpos]-4,FACEUP,BGND);
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RestoreCorners(hMemB1, 0, 0);
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ReleaseDC(hWnd, hDC);
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}
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else
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{
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SelectObject(hMemB2, hBM_Ghost);
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BitBlt(hMemB1, 0, 0, dxCrd, dyCrd, hMemB2, 0, 0, SRCCOPY);
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SelectObject(hMemB2, hBM_Bgnd2);
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}
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}
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else // else background contains bottom part of card above.
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{
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SelectObject(hMemB1, hBgndBrush);
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PatBlt(hMemB1, 0, 0, dxCrd, dyCrd, PATCOPY);
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if (fpos != 0)
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{
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cdtDrawExt(hMemB1, 0, 0-dyTops, dxCrd, dyCrd, card[fcol][fpos-1],
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FACEUP, BGND);
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}
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}
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/* Foreground bitmap is just the card to be moved. */
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cdtDrawExt(hMemF, 0, 0, dxCrd, dyCrd, card[fcol][fpos], FACEUP, 0);
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}
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/******************************************************************************
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GlideStep
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This routine gets called once for each step in the glide animation. On
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input, it needs the screen under the source in hMemB1, and the card to be
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moved in hMemF. It calculates the screen under the destination itself and
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blts it into hMemB2. At the end of the animation, it moves hMemB2 into
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hMemB1 so it can be call again immediately with new coordinates.
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******************************************************************************/
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VOID GlideStep(HDC hDC, UINT x1, UINT y1, UINT x2, UINT y2)
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{
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HDC hMemTemp; // used to swap mem DCs.
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SetRectRgn(hRgn1, x1, y1, x1+dxCrd, y1+dyCrd);
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SetRectRgn(hRgn2, x2, y2, x2+dxCrd, y2+dyCrd);
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/* create background of new location by combing screen background
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plus overlap from old background */
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BitBlt(hMemB2, 0, 0, dxCrd, dyCrd, hDC, x2, y2, SRCCOPY);
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BitBlt(hMemB2, x1-x2, y1-y2, dxCrd, dyCrd, hMemB1, 0, 0, SRCCOPY);
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/* Draw old background and then draw card */
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CombineRgn(hRgn, hRgn1, hRgn2, RGN_DIFF); // part of hRgn1 not in hRgn2
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SelectObject(hDC, hRgn);
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BitBlt(hDC, x1, y1, dxCrd, dyCrd, hMemB1, 0, 0, SRCCOPY);
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SelectObject(hDC, hRgn2);
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BitBlt(hDC, x2, y2, dxCrd, dyCrd, hMemF, 0, 0, SRCCOPY);
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/* copy new background to old background, or rather, accomplish the
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same effect by swapping the associated memory device contexts. */
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hMemTemp = hMemB1;
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hMemB1 = hMemB2;
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hMemB2 = hMemTemp;
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}
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/******************************************************************************
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IntSqrt
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Newton's method to find a quick close-enough square root without pulling
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in the floating point libraries.
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f(x) == x*x - square == 0
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f'(x) == 2x
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******************************************************************************/
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INT IntSqrt(INT square)
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{
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INT guess, lastguess;
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lastguess = square;
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guess = min(square / 2, 1024);
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while (abs(guess-lastguess) > 3) // 3 is close enough
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{
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lastguess = guess;
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guess -= ((guess * guess) - square) / (2 * guess);
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}
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return guess;
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}
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/******************************************************************************
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SaveCorners
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RestoreCorners
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based on similar routines in cards.dll
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******************************************************************************/
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VOID SaveCorners(HDC hDC, UINT x, UINT y)
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{
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// Upper Left
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dwPixel[0] = GetPixel(hDC, x, y);
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dwPixel[1] = GetPixel(hDC, x+1, y);
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dwPixel[2] = GetPixel(hDC, x, y+1);
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// Upper Right
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x += dxCrd -1;
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dwPixel[3] = GetPixel(hDC, x, y);
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dwPixel[4] = GetPixel(hDC, x-1, y);
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dwPixel[5] = GetPixel(hDC, x, y+1);
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// Lower Right
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y += dyCrd-1;
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dwPixel[6] = GetPixel(hDC, x, y);
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dwPixel[7] = GetPixel(hDC, x, y-1);
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dwPixel[8] = GetPixel(hDC, x-1, y);
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// Lower Left
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x -= dxCrd-1;
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dwPixel[9] = GetPixel(hDC, x, y);
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dwPixel[10] = GetPixel(hDC, x+1, y);
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dwPixel[11] = GetPixel(hDC, x, y-1);
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}
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VOID RestoreCorners(HDC hDC, UINT x, UINT y)
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{
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// Upper Left
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SetPixel(hDC, x, y, dwPixel[0]);
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SetPixel(hDC, x+1, y, dwPixel[1]);
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SetPixel(hDC, x, y+1, dwPixel[2]);
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// Upper Right
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x += dxCrd-1;
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SetPixel(hDC, x, y, dwPixel[3]);
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SetPixel(hDC, x-1, y, dwPixel[4]);
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SetPixel(hDC, x, y+1, dwPixel[5]);
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// Lower Right
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y += dyCrd-1;
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SetPixel(hDC, x, y, dwPixel[6]);
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SetPixel(hDC, x, y-1, dwPixel[7]);
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SetPixel(hDC, x-1, y, dwPixel[8]);
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// Lower Left
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x -= dxCrd-1;
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SetPixel(hDC, x, y, dwPixel[9]);
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SetPixel(hDC, x+1, y, dwPixel[10]);
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SetPixel(hDC, x, y-1, dwPixel[11]);
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}
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