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- /**********************************************************************\
-
- File: Circle out.c
-
- Purpose: Graphic effect from offscreen bitmap to main window (on
- screen). See comments below for more description.
-
-
- Jotto ][ -=- a simple word game, revisited
- Copyright (C) 1993 Mark Pilgrim
-
- 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 "msg timing.h"
- #include "wipe dispatch.h"
-
- #define gap 4 /* difference between one radius and the next */
- #define CorrectTime 2
-
- /* Make a circular region and use it as the mask in CopyBits. Lots of overlap,
- but masked by timing correction. If you want to optimize it, look at the
- donut region code in "Circle in.c" */
-
- void CircleOut(GrafPtr sourceGrafPtr, GrafPtr destGrafPtr, short theWindowHeight, short theWindowWidth)
- {
- Rect theRect;
- short cx, cy;
- RgnHandle curregion;
-
- cx = theWindowWidth / 2;
- cy = theWindowHeight / 2;
-
- theRect.left=cx-gap; /* circumscribing rectangle for circle */
- theRect.right=cx+gap;
- theRect.top=cy-gap;
- theRect.bottom=cy+gap;
-
- curregion=NewRgn();
-
- do
- {
- StartTiming();
- SetEmptyRgn(curregion);
- OpenRgn();
- FrameOval(&theRect); /* the circle region */
- CloseRgn(curregion);
- CopyBits(&(sourceGrafPtr->portBits), &(destGrafPtr->portBits),
- &theRect, &theRect, 0, curregion);
- theRect.left-=gap; /* make the rect bigger (and thus the circle) */
- theRect.right+=gap;
- theRect.top-=gap;
- theRect.bottom+=gap;
- TimeCorrection(CorrectTime);
- }
- while (theRect.right-theRect.left<=425); /* (2 x || (cx,cy) ||) + a little */
-
- DisposeRgn(curregion);
- }
-