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Info_Mac IV CD-ROM (Pacific HiTech Inc.)(August 1994).iso
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Split scroll U-D.c
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1994-04-15
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/**********************************************************************\
File: Split scroll U-D.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 4
#define theWindowWidth (boundsRect.right-boundsRect.left)
#define theWindowHeight (boundsRect.bottom-boundsRect.top)
pascal short SplitScrollUD(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect);
/* Draw a line from the topleft to the bottomright of the screen and split the
screen into two regions. The top region scrolls down and the bottom region
scrolls up. */
pascal short SplitScrollUD(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect)
{
int x;
Rect theTopRect, topdest, theBottomRect, bottomdest;
Rect topscrollsource, topscrolldest, bottomscrollsource, bottomscrolldest;
RgnHandle toprgn,bottomrgn;
int BoxSize;
BoxSize=theWindowHeight/25;
toprgn=NewRgn();
SetEmptyRgn(toprgn);
MoveTo(0,0);
OpenRgn();
Line(theWindowWidth,0);
Line(0,theWindowHeight);
LineTo(0,0);
CloseRgn(toprgn);
OffsetRgn(toprgn, boundsRect.left, boundsRect.top);
bottomrgn=NewRgn();
SetEmptyRgn(bottomrgn);
MoveTo(0,0);
OpenRgn();
Line(0,theWindowHeight);
Line(theWindowWidth,0);
LineTo(0,0);
CloseRgn(bottomrgn);
OffsetRgn(bottomrgn, boundsRect.left, boundsRect.top);
topscrollsource=boundsRect;
topscrollsource.bottom-=BoxSize;
topscrolldest = topscrollsource;
OffsetRect(&topscrolldest, 0, BoxSize);
topdest = boundsRect;
topdest.bottom=topdest.top+BoxSize;
SetRect(&theTopRect, boundsRect.left, boundsRect.bottom-BoxSize, boundsRect.right, boundsRect.bottom);
bottomscrollsource=boundsRect;
bottomscrollsource.top+=BoxSize;
bottomscrolldest=bottomscrollsource;
OffsetRect(&bottomscrolldest, 0, -BoxSize);
bottomdest=boundsRect;
bottomdest.top=bottomdest.bottom-BoxSize;
SetRect(&theBottomRect, boundsRect.left, boundsRect.top, boundsRect.right, boundsRect.top+BoxSize);
for(x = theWindowHeight - BoxSize; x >= 0; x -= BoxSize)
{
StartTiming();
CopyBits(&(destGrafPtr->portBits), &(destGrafPtr->portBits),
&topscrollsource, &topscrolldest, 0, toprgn);
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&theTopRect, &topdest, 0, toprgn);
theTopRect.bottom-=BoxSize;
theTopRect.top-=BoxSize;
CopyBits(&(destGrafPtr->portBits), &(destGrafPtr->portBits),
&bottomscrollsource, &bottomscrolldest, 0, bottomrgn);
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&theBottomRect, &bottomdest, 0, bottomrgn);
theBottomRect.top+=BoxSize;
theBottomRect.bottom+=BoxSize;
TimeCorrection(CorrectTime);
}
return 0;
}