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- /**********************************************************************\
-
- File: Four centered fade reversed.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 6
- #define theWindowHeight (boundsRect.bottom-boundsRect.top)
- #define theWindowWidth (boundsRect.right-boundsRect.left)
-
- pascal short FourCenteredFadeReversed(Rect boundsRect, Pattern *thePattern);
-
- /* Really, this only uses one region and one CopyBits per round. Regions don't
- have to be continuous. On each axis, on each side of the center of the screen,
- there are two parts of the region which move from the corners to the center. */
-
- pascal short FourCenteredFadeReversed(Rect boundsRect, Pattern *thePattern)
- {
- RgnHandle curregion, boundsRgn, sectrgn;
- int cx,cy,lastx,lasty;
- int BlockSize, VBlockSize;
-
- cx = boundsRect.left + theWindowWidth / 2;
- cy = boundsRect.top + theWindowHeight / 2;
- BlockSize=theWindowWidth/50;
- VBlockSize=theWindowHeight/50;
-
- boundsRgn=NewRgn();
- RectRgn(boundsRgn, &boundsRect);
- sectrgn=NewRgn();
-
- curregion=NewRgn();
-
- lasty=theWindowHeight/2;
- lastx=theWindowWidth/2;
- do
- {
- StartTiming();
- SetEmptyRgn(curregion);
- MoveTo(cx,cy);
- OpenRgn(); /* much much faster than 8 regions/CopyBits */
- LineTo(cx-lastx,boundsRect.top);
- Line(-BlockSize,0);
- LineTo(cx+lastx+BlockSize,boundsRect.bottom);
- Line(-BlockSize,0);
- LineTo(cx,cy);
-
- LineTo(cx+lastx,boundsRect.top);
- Line(BlockSize,0);
- LineTo(cx-lastx-BlockSize,boundsRect.bottom);
- Line(BlockSize,0);
- LineTo(cx,cy);
-
- LineTo(boundsRect.right,cy-lasty);
- Line(0,-VBlockSize);
- LineTo(boundsRect.left,cy+lasty+VBlockSize);
- Line(0,-VBlockSize);
- LineTo(cx,cy);
-
- LineTo(boundsRect.right,cy+lasty);
- Line(0,VBlockSize);
- LineTo(boundsRect.left,cy-lasty-VBlockSize);
- Line(0,VBlockSize);
- LineTo(cx,cy);
- CloseRgn(curregion);
-
- SectRgn(curregion, boundsRgn, sectrgn);
- FillRgn(sectrgn, *thePattern);
- lastx-=BlockSize;
- lasty-=VBlockSize;
- TimeCorrection(CorrectTime);
- }
- while (lastx>boundsRect.left);
-
- FillRect(&boundsRect, *thePattern); /* in case we miss a few pixels */
-
- DisposeRgn(curregion);
- DisposeRgn(boundsRgn);
- DisposeRgn(sectrgn);
-
- return 0;
- }
-