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Annotation of 43BSDReno/games/chess/Xchess/XCircle.c, revision 1.1

1.1     ! root        1: 
        !             2: /* This file contains code for X-CHESS.
        !             3:    Copyright (C) 1986 Free Software Foundation, Inc.
        !             4: 
        !             5: This file is part of X-CHESS.
        !             6: 
        !             7: X-CHESS is distributed in the hope that it will be useful,
        !             8: but WITHOUT ANY WARRANTY.  No author or distributor
        !             9: accepts responsibility to anyone for the consequences of using it
        !            10: or for whether it serves any particular purpose or works at all,
        !            11: unless he says so in writing.  Refer to the X-CHESS General Public
        !            12: License for full details.
        !            13: 
        !            14: Everyone is granted permission to copy, modify and redistribute
        !            15: X-CHESS, but only under the conditions described in the
        !            16: X-CHESS General Public License.   A copy of this license is
        !            17: supposed to have been given to you along with X-CHESS so you
        !            18: can know your rights and responsibilities.  It should be in a
        !            19: file named COPYING.  Among other things, the copyright notice
        !            20: and this notice must be preserved on all copies.  */
        !            21: 
        !            22: 
        !            23: /* RCS Info: $Revision: 1.2 $ on $Date: 86/11/23 17:17:04 $
        !            24:  *           $Source: /users/faustus/xchess/RCS/XCircle.c,v $
        !            25:  * Copyright (c) 1986 Wayne A. Christopher, U. C. Berkeley CAD Group
        !            26:  *     Permission is granted to do anything with this code except sell it
        !            27:  *     or remove this message.
        !            28:  *
        !            29:  */
        !            30: 
        !            31: #include <stdio.h>
        !            32: #include <X11/Xlib.h>
        !            33: #include <X11/X10.h>
        !            34: #include <math.h>
        !            35: 
        !            36: #define PI 3.1415926535897932384
        !            37: 
        !            38: #define MAXVERTS 1000
        !            39: 
        !            40: void
        !            41: XCircle(win, x, y, rad, start, end, width, height, pixel, func, planes)
        !            42:        Window win;
        !            43:        int x, y, rad;
        !            44:        double start, end;
        !            45:        int pixel;
        !            46:        int width, height;
        !            47:        int func, planes;
        !            48: {
        !            49:        Vertex verts[MAXVERTS];
        !            50:        double xp, yp, ang;
        !            51:        int lx, ly, xpt, ypt, i;
        !            52:        double gradincr = 2 / (double) rad;
        !            53:        int bk = 0;
        !            54: 
        !            55:        while (end >= PI * 2)
        !            56:                end -= PI * 2;
        !            57:        while (start >= PI * 2)
        !            58:                start -= PI * 2;
        !            59:        while (end < 0)
        !            60:                end += PI * 2;
        !            61:        while (start < 0)
        !            62:                start += PI * 2;
        !            63:        if (end == start) {
        !            64:                if (end < gradincr)
        !            65:                        end = end + PI * 2 - gradincr / 2;
        !            66:                else
        !            67:                        end -= gradincr / 2;
        !            68:        }
        !            69:        for (ang = start, i = 0; i < MAXVERTS; ) {
        !            70: 
        !            71:                xp = x + rad * cos(ang);
        !            72:                yp = y + rad * sin(ang);
        !            73: 
        !            74:                xpt = xp;
        !            75:                ypt = yp;
        !            76: 
        !            77:                if (!i || (lx != xpt) || (ly != ypt)) {
        !            78:                        verts[i].x = xpt;
        !            79:                        verts[i].y = ypt;
        !            80:                        verts[i].flags = 0;
        !            81:                        i++;
        !            82:                }
        !            83:                lx = xpt;
        !            84:                ly = ypt;
        !            85:                if (bk)
        !            86:                        break;
        !            87:                if (((ang < end) && (ang + gradincr > end)) || ((end < start)
        !            88:                                && (ang + gradincr > 2 * PI)
        !            89:                                && (ang + gradincr - 2 * PI > end))) {
        !            90:                        ang = end;
        !            91:                        bk = 1;
        !            92:                } else if (ang == end) {
        !            93:                        break;
        !            94:                } else {
        !            95:                        ang += gradincr;
        !            96:                }
        !            97:                if (ang >= PI * 2)
        !            98:                        ang -= PI * 2;
        !            99:        }
        !           100: 
        !           101:        /* Now draw the thing.. */
        !           102:        XDraw(win, verts, i, width, height, pixel, func, planes);
        !           103: 
        !           104:        return;
        !           105: }
        !           106: 
        !           107: #ifdef notdef  VertexCurved is screwed up
        !           108: 
        !           109: void
        !           110: XCircle(win, x, y, rad, start, end, width, height, pixel, func, planes)
        !           111:        Window win;
        !           112:        int x, y, rad;
        !           113:        double start, end;
        !           114:        int pixel;
        !           115:        int width, height;
        !           116:        int func, planes;
        !           117: {
        !           118:        Vertex verts[7];
        !           119:        int i, j, sv, ev;
        !           120:        int dp = 0;
        !           121: 
        !           122:        for (i = j = 0 ; i < 4; i++) {
        !           123:                verts[j].x = x + rad * cos((double) (PI * i / 2));
        !           124:                verts[j].y = y + rad * sin((double) (PI * i / 2));
        !           125:                verts[j].flags = VertexCurved;
        !           126:                if ((start >= PI * i / 2) && (start < PI * (i + 1) / 2) &&
        !           127:                                (start != end)) {
        !           128:                        j++;
        !           129:                        verts[j].x = x + rad * cos(start);
        !           130:                        verts[j].y = y + rad * sin(start);
        !           131:                        verts[j].flags = VertexCurved;
        !           132:                        sv = j;
        !           133:                } else if ((end >= PI * i / 2) && (end < PI * (i + 1) / 2)
        !           134:                                && (start != end)) {
        !           135:                        j++;
        !           136:                        verts[j].x = x + rad * cos(end);
        !           137:                        verts[j].y = y + rad * sin(end);
        !           138:                        verts[j].flags = VertexCurved;
        !           139:                        ev = j;
        !           140:                }
        !           141:                j++;
        !           142:        }
        !           143:        verts[0].flags |= VertexStartClosed;
        !           144:        verts[j].x = verts[0].x;
        !           145:        verts[j].y = verts[0].y;
        !           146:        verts[j].flags = (verts[0].flags & ~VertexStartClosed) | 
        !           147:                        VertexEndClosed;
        !           148:        for (i = 0; i < 15; i++) {
        !           149:                if (dp)
        !           150:                        verts[i % 7].flags |= VertexDontDraw;
        !           151:                if (i % 7 == ev)
        !           152:                        dp = 1;
        !           153:                else if (i % 7 == sv)
        !           154:                        dp = 0;
        !           155:        }
        !           156:        XDraw(win, verts, j + 1, width, height, pixel, func, planes);
        !           157: 
        !           158:        return;
        !           159: }
        !           160: 
        !           161: #endif notdef
        !           162: 

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