home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Info-Mac 4
/
Info_Mac IV CD-ROM (Pacific HiTech Inc.)(August 1994).iso
/
Development
/
Source
/
MSG Demo 1.4.source Folder
/
Demo ƒ
/
Fades ƒ
/
Circular fade.c
< prev
next >
Wrap
Text File
|
1994-04-15
|
4KB
|
131 lines
/**********************************************************************\
File: Circular 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 theWindowHeight (boundsRect.bottom-boundsRect.top)
#define theWindowWidth (boundsRect.right-boundsRect.left)
pascal short CircularFade(Rect boundsRect, Pattern *thePattern);
/* Trace a region from the center to the topleft corner, over <BlockSize> pixels,
and back to the center. Fill that in and move the region parameters +BlockSize.
Repeat for all sides. */
pascal short CircularFade(Rect boundsRect, Pattern *thePattern)
{
RgnHandle curregion;
int cx,cy,lastx,lasty;
int BlockSize;
RgnHandle boundsRgn,sectrgn;
BlockSize=theWindowWidth/40;
cx = boundsRect.left + theWindowWidth / 2;
cy = boundsRect.top + theWindowHeight / 2;
boundsRgn=NewRgn();
RectRgn(boundsRgn, &boundsRect);
sectrgn=NewRgn();
curregion=NewRgn();
lastx=boundsRect.left;
do /* top quadrant */
{
StartTiming();
SetEmptyRgn(curregion);
MoveTo(cx,cy);
OpenRgn();
LineTo(lastx,boundsRect.top);
Line(BlockSize,0);
LineTo(cx,cy);
CloseRgn(curregion);
SectRgn(boundsRgn, curregion, sectrgn);
FillRgn(sectrgn, *thePattern);
lastx+=BlockSize;
TimeCorrection(CorrectTime);
}
while (lastx<boundsRect.right);
lasty=boundsRect.top;
do /* right quadrant */
{
StartTiming();
SetEmptyRgn(curregion);
MoveTo(cx,cy);
OpenRgn();
LineTo(boundsRect.right,lasty);
Line(0,BlockSize);
LineTo(cx,cy);
CloseRgn(curregion);
SectRgn(boundsRgn, curregion, sectrgn);
FillRgn(sectrgn, *thePattern);
lasty+=BlockSize;
TimeCorrection(CorrectTime);
}
while (lasty<boundsRect.bottom);
lastx=boundsRect.right;
do /* bottom quadrant */
{
StartTiming();
SetEmptyRgn(curregion);
MoveTo(cx,cy);
OpenRgn();
LineTo(lastx,boundsRect.bottom);
Line(-BlockSize, 0);
LineTo(cx,cy);
CloseRgn(curregion);
SectRgn(boundsRgn, curregion, sectrgn);
FillRgn(sectrgn, *thePattern);
lastx-=BlockSize;
TimeCorrection(CorrectTime);
}
while (lastx>boundsRect.left-BlockSize);
lasty=boundsRect.bottom;
do /* left quadrant */
{
StartTiming();
SetEmptyRgn(curregion);
MoveTo(cx,cy);
OpenRgn();
LineTo(boundsRect.left,lasty);
Line(0, -BlockSize);
LineTo(cx,cy);
CloseRgn(curregion);
SectRgn(boundsRgn, curregion, sectrgn);
FillRgn(sectrgn, *thePattern);
lasty-=BlockSize;
TimeCorrection(CorrectTime);
}
while (lasty>boundsRect.top-BlockSize);
DisposeRgn(curregion);
DisposeRgn(sectrgn);
DisposeRgn(boundsRgn);
return 0;
}