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Annotation of 43BSD/contrib/X/uwm/StoreGridBox.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char *rcsid_StoreGridBox_c = "$Header: StoreGridBox.c,v 10.3 86/02/01 16:24:00 tony Rel $";
        !             3: #endif lint
        !             4: 
        !             5: /************************************************************************
        !             6:  *                                                                     *
        !             7:  *                     Copyright (c) 1986 by                           *
        !             8:  *             Digital Equipment Corporation, Maynard, MA              *
        !             9:  *                      All Rights Reserved.                           *
        !            10:  *                                                                     *
        !            11:  *     Permission to use, copy, modify, and distribute this software   *
        !            12:  *     and its documentation is hereby granted only to licensees of    *
        !            13:  *     The Regents of the University of California pursuant to their   *
        !            14:  *     license agreement for the Berkeley Software Distribution        *
        !            15:  *     provided that the following appears on all copies.              *
        !            16:  *                                                                     *
        !            17:  *            "LICENSED FROM DIGITAL EQUIPMENT CORPORATION             *
        !            18:  *                      COPYRIGHT (C) 1986                             *       
        !            19:  *                 DIGITAL EQUIPMENT CORPORATION                       *
        !            20:  *                         MAYNARD, MA                                 *
        !            21:  *                     ALL RIGHTS RESERVED.                            *
        !            22:  *                                                                     *
        !            23:  *      THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT  * 
        !            24:  *     NOTICE AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL   *
        !            25:  *     EQUIPMENT CORPORATION.  DIGITAL MAKES NO REPRESENTATIONS        *
        !            26:  *     ABOUT SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. IT IS       *
        !            27:  *     SUPPLIED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.           *
        !            28:  *                                                                     *       
        !            29:  *     IF THE UNIVERSITY OF CALIFORNIA OR ITS LICENSEES MODIFY         *       
        !            30:  *     THE SOFTWARE IN A MANNER CREATING DERIVATIVE COPYRIGHT          *       
        !            31:  *     RIGHTS APPROPRIATE COPYRIGHT LEGENDS MAY BE PLACED ON THE       *
        !            32:  *     DERIVATIVE WORK IN ADDITION TO THAT SET FORTH ABOVE."           *       
        !            33:  *                                                                     *
        !            34:  ************************************************************************/
        !            35:  
        !            36: 
        !            37: /*
        !            38:  * MODIFICATION HISTORY
        !            39:  *
        !            40:  * 000 -- M. Gancarz, DEC Ultrix Engineering Group
        !            41:  */
        !            42: 
        !            43: #ifndef lint
        !            44: static char *sccsid = "@(#)StoreGridBox.c      3.8     1/24/86";
        !            45: #endif
        !            46: /*
        !            47:  *     StoreGridBox - This subroutine is used by the X Window Manager (xwm)
        !            48:  *     to store the vertices for the movement resize grid and box in a
        !            49:  *     vertex list.
        !            50:  */
        !            51: 
        !            52: #include "uwm.h"
        !            53: 
        !            54: /*
        !            55:  * Store the vertices for the movement resize grid and box in a vertex list.
        !            56:  */
        !            57: int StoreGridBox(box, ulx, uly, lrx, lry)
        !            58: register Vertex box[];
        !            59: int ulx;                       /* Upper left X coordinate. */
        !            60: int uly;                       /* Upper left Y coordinate. */
        !            61: int lrx;                       /* Lower right X coordinate. */
        !            62: int lry;                       /* Lower right Y coordinate. */
        !            63: {
        !            64:     register int xthird, ythird;
        !            65:     int x1third, y1third;
        !            66:     int x2third, y2third;
        !            67: 
        !            68:     /*
        !            69:      * Xor in.
        !            70:      */
        !            71:     box[0].x = box[3].x = box[4].x = box[5].x = box[7].x = ulx;
        !            72:     box[1].x = box[2].x = box[6].x = box[8].x = lrx;
        !            73: 
        !            74:     box[0].y = box[1].y = box[4].y = box[9].y = box[11].y = uly;
        !            75:     box[2].y = box[3].y = box[10].y = box[12].y = lry;
        !            76: 
        !            77:     box[0].flags = box[5].flags = box[7].flags = box[9].flags =
        !            78:         box[11].flags = VertexDontDraw;
        !            79: 
        !            80:     /*
        !            81:      * These are the X and Y calculations for the parts of the grid that
        !            82:      * are dependent on the division by 3 calculations.
        !            83:      */
        !            84: 
        !            85:     /*
        !            86:      * Y dimension third.
        !            87:      */
        !            88:     ythird = (lry - uly) / 3;
        !            89:     y1third = uly + ythird;
        !            90:     y2third = y1third + ythird;
        !            91:    
        !            92:     /*
        !            93:      * X dimension third.
        !            94:      */
        !            95:     xthird = (lrx - ulx) / 3;
        !            96:     x1third = ulx + xthird;
        !            97:     x2third = x1third + xthird;
        !            98: 
        !            99:     /*
        !           100:      * Stash first set of vertices.
        !           101:      */
        !           102:     box[5].y = box[6].y = y1third;
        !           103:     box[7].y = box[8].y = y2third;
        !           104: 
        !           105:     box[9].x = box[10].x = x1third;
        !           106:     box[11].x = box[12].x = x2third; 
        !           107: 
        !           108:     /*
        !           109:      * Do not erase if we're freezing the screen.
        !           110:      */
        !           111:     if (Freeze)
        !           112:         return(13);
        !           113: 
        !           114:     /*
        !           115:      * From here on we're retracing the vertices to clear the
        !           116:      * grid using GXxor.
        !           117:      */
        !           118:     box[18].y = box[19].y = y1third;
        !           119:     box[20].y = box[21].y = y2third;
        !           120: 
        !           121:     box[22].x = box[23].x = x1third;
        !           122:     box[24].x = box[25].x = x2third;
        !           123: 
        !           124:     box[13].x = box[16].x = box[17].x = box[18].x = box[20].x = ulx;
        !           125:     box[13].y = box[14].y = box[17].y = box[22].y = box[24].y = uly;
        !           126: 
        !           127:     box[14].x = box[15].x = box[19].x = box[21].x = lrx;
        !           128:     box[15].y = box[16].y = box[23].y = box[25].y = lry;
        !           129: 
        !           130:     box[13].flags = box[18].flags = box[20].flags = box[22].flags =
        !           131:         box[24].flags = VertexDontDraw;
        !           132: 
        !           133: 
        !           134:     /*
        !           135:      * Total number of vertices is 26.
        !           136:      */
        !           137:     return(26);
        !           138: }

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