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Quadrant scroll.c
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1994-04-19
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/**********************************************************************\
File: Quadrant 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)
#define NUM_ITERATIONS 25
pascal short QuadrantScroll(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect);
/* 4 regions, splitting the screen into 4 quadrants. Scroll the screen right in
the top-left quadrant, down in the top-right, left in the bottom-right,
up in the bottom-left. */
pascal short QuadrantScroll(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect)
{
int x;
Rect tlsource, trsource, blsource, brsource;
Rect tldest, trdest, bldest, brdest;
Rect tlscroll, trscroll, blscroll, brscroll;
int cx,cy;
int BoxSize, HBoxSize;
BoxSize=theWindowHeight/(NUM_ITERATIONS*2);
HBoxSize=theWindowWidth/(NUM_ITERATIONS*2);
cx = boundsRect.left + theWindowWidth / 2;
cy = boundsRect.top + theWindowHeight / 2;
tlscroll=trscroll=blscroll=brscroll=tldest=trdest=bldest=brdest=boundsRect;
tlscroll.right=trscroll.left=blscroll.right=brscroll.left=
tldest.right=trdest.left=bldest.right=brdest.left=cx;
tlscroll.bottom=trscroll.bottom=blscroll.top=brscroll.top=
tldest.bottom=trdest.bottom=bldest.top=brdest.top=cy;
tldest.right=tldest.left+HBoxSize;
trdest.bottom=trdest.top+BoxSize;
brdest.left=brdest.right-HBoxSize;
bldest.top=bldest.bottom-BoxSize;
SetRect(&tlsource, cx-HBoxSize, boundsRect.top, cx, cy);
SetRect(&trsource, cx, cy-BoxSize, boundsRect.right, cy);
SetRect(&brsource, cx, cy, cx+HBoxSize, boundsRect.bottom);
SetRect(&blsource, boundsRect.left, cy, cx, cy+BoxSize);
for (x=0; x<NUM_ITERATIONS; x++)
{
StartTiming();
ScrollTheRect(&tlscroll, HBoxSize, 0, 0L);
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&tlsource, &tldest, 0, 0L);
tlsource.left-=HBoxSize;
tlsource.right-=HBoxSize;
ScrollTheRect(&trscroll, 0, BoxSize, 0L);
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&trsource, &trdest, 0, 0L);
trsource.top-=BoxSize;
trsource.bottom-=BoxSize;
ScrollTheRect(&brscroll, -HBoxSize, 0, 0L);
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&brsource, &brdest, 0, 0L);
brsource.left+=HBoxSize;
brsource.right+=HBoxSize;
ScrollTheRect(&blscroll, 0, -BoxSize, 0L);
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&blsource, &bldest, 0, 0L);
blsource.top+=BoxSize;
blsource.bottom+=BoxSize;
TimeCorrection(CorrectTime);
}
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&boundsRect, &boundsRect, 0, 0L);
return 0;
}