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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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Fades ƒ
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Diagonal fade.c
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1994-04-15
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/**********************************************************************\
File: Diagonal fade.c
Purpose: Graphic effect to fade main window to solid pattern.
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 2
#define theWindowWidth (boundsRect.right-boundsRect.left)
#define theWindowHeight (boundsRect.bottom-boundsRect.top)
pascal short DiagonalFade(Rect boundsRect, Pattern *thePattern);
/* If you make a long enough region starting at the bottomright corner and
making a strip down and left of <BoxSize> width, all you have to do is move
the region up until the entire screen is filled. Dave thinks ideas like
this should be taken out and shot, but it works. */
pascal short DiagonalFade(Rect boundsRect, Pattern *thePattern)
{
int maxmax;
RgnHandle archie;
int BoxSize;
Point zeroPoint;
RgnHandle boundsRgn, sectrgn;
zeroPoint.h=boundsRect.left;
zeroPoint.v=boundsRect.top;
BoxSize=theWindowWidth/40;
maxmax=(theWindowWidth>theWindowHeight) ? theWindowWidth : theWindowHeight;
maxmax+=BoxSize;
boundsRgn=NewRgn();
RectRgn(boundsRgn, &boundsRect);
sectrgn=NewRgn();
archie=NewRgn();
OpenRgn();
MoveTo(boundsRect.right+BoxSize, boundsRect.bottom);
Line(0,BoxSize);
Line(-maxmax,maxmax);
Line(-BoxSize,0);
Line(maxmax,-maxmax);
CloseRgn(archie);
do
{
StartTiming();
OffsetRgn(archie,0,-BoxSize);
SectRgn(archie, boundsRgn, sectrgn);
FillRgn(sectrgn, *thePattern);
TimeCorrection(CorrectTime);
}
while (!PtInRgn(zeroPoint, archie));
DisposeRgn(archie);
DisposeRgn(boundsRgn);
DisposeRgn(sectrgn);
return 0;
}