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Info_Mac IV CD-ROM (Pacific HiTech Inc.)(August 1994).iso
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MSG Demo 1.4.source Folder
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Demo ƒ
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Circle bulge.c
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1994-04-15
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/**********************************************************************\
File: Circle bulge.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 startgap 1
#define gapratio 6
#define zeropointH 15
#define CorrectTime 3
#define theWindowHeight (boundsRect.bottom-boundsRect.top)
#define theWindowWidth (boundsRect.right-boundsRect.left)
pascal short CircleBulge(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect);
/* This copies ovals that always run from the left of the screen to the right,
but start really squashed and get geometrically taller. */
pascal short CircleBulge(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, Rect boundsRect)
{
Rect theRect;
RgnHandle curregion;
Point zeropoint;
int cy=theWindowHeight/2;
int gap=startgap;
theRect.left=boundsRect.left;
theRect.right=boundsRect.right;
theRect.top=boundsRect.top+cy-gap;
theRect.bottom=boundsRect.top+cy+gap;
curregion=NewRgn();
zeropoint.v=boundsRect.top;
zeropoint.h=boundsRect.left+zeropointH;
do
{
StartTiming();
SetEmptyRgn(curregion);
OpenRgn();
FrameOval(&theRect); /* this makes the region for copying */
CloseRgn(curregion);
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&boundsRect, &boundsRect, 0, curregion);
theRect.top-=gap;
theRect.bottom+=gap; /* make the oval taller */
gap++;
gap+=gap/gapratio; /* make the oval grow faster next time */
TimeCorrection(CorrectTime);
}
while (!(PtInRgn(zeropoint, curregion))); /* quit when we hit zeropoint */
CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
&boundsRect, &boundsRect, 0, 0L); /* copy the whole screen to end it */
DisposeRgn(curregion);
return 0;
}