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Halves scroll.c
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1994-04-19
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/**********************************************************************\
File: Halves scroll.c
Purpose: Graphic effect from offscreen bitmap to main window (on
screen). See comments below for more description.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program in a file named "GNU General Public License".
If not, write to the Free Software Foundation, 675 Mass Ave,
Cambridge, MA 02139, USA.
\**********************************************************************/
#include "timing.h"
#define CorrectTime 3
#define theWindowHeight (boundsRect.bottom-boundsRect.top)
#define theWindowWidth (boundsRect.right-boundsRect.left)
pascal short HalvesScroll(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect);
/* 2 regions, split down the middle of the screen. Scroll the screen up in one
region and down in the other. */
pascal short HalvesScroll(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect)
{
int x;
Rect theTopRect, topdest, theBottomRect, bottomdest;
Rect topscrollsource, bottomscrollsource;
int cx;
int BoxSize;
BoxSize=theWindowHeight/25;
cx = boundsRect.left + theWindowWidth / 2;
topscrollsource=topdest=bottomscrollsource=bottomdest=boundsRect;
topscrollsource.right=topdest.right=bottomscrollsource.left=bottomdest.left=cx;
topdest.bottom=topdest.top+BoxSize;
bottomdest.top=bottomdest.bottom-BoxSize;
SetRect(&theTopRect, boundsRect.left, boundsRect.bottom-BoxSize, cx, boundsRect.bottom);
SetRect(&theBottomRect, cx, boundsRect.top, boundsRect.right, boundsRect.top+BoxSize);
for(x = theWindowHeight - BoxSize; x >= 0; x -= BoxSize)
{
StartTiming();
ScrollTheRect(&topscrollsource, 0, BoxSize, 0L);
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&theTopRect, &topdest, 0, 0L);
theTopRect.bottom-=BoxSize;
theTopRect.top-=BoxSize;
ScrollTheRect(&bottomscrollsource, 0, -BoxSize, 0L);
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&theBottomRect, &bottomdest, 0, 0L);
theBottomRect.top+=BoxSize;
theBottomRect.bottom+=BoxSize;
TimeCorrection(CorrectTime);
}
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&boundsRect, &boundsRect, 0, 0L);
return 0;
}