diff options
Diffstat (limited to 'usr/src/lib/libplot/t300s/common/arc.c')
| -rw-r--r-- | usr/src/lib/libplot/t300s/common/arc.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/usr/src/lib/libplot/t300s/common/arc.c b/usr/src/lib/libplot/t300s/common/arc.c new file mode 100644 index 0000000000..b0d368e275 --- /dev/null +++ b/usr/src/lib/libplot/t300s/common/arc.c @@ -0,0 +1,185 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ +/* All Rights Reserved */ + + +/* + * Copyright 2005 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.4 */ +/*LINTLIBRARY*/ + +#include <stdlib.h> +#include <math.h> +#include <plot.h> +#include "con.h" + +static int del = 20; + +static void +step(int d) +{ + del = d; +} + +/* local definition of quad */ +static int +quad_l(short x, short y, short xp, short yp) +{ + if (x < xp) + if (y <= yp) + return (1); + else return (4); + else if (x > xp) + if (y < yp) + return (2); + else return (3); + else if (y < yp) + return (2); + else return (4); +} + +void +arc(short x, short y, short x0, short y0, short x1, short y1) +{ + double pc; + int flg, m, xc, yc, xs, ys, qs, qf, qt, qtctr = 0; + int m0, m1; + float dx, dy, r; + char use; + dx = x - x0; + dy = y - y0; + r = dx * dx + dy * dy; + pc = r; + pc = sqrt(pc); + flg = (short)(pc / 4); + if (flg == 0) + step(1); + else if (flg < del) + step(flg); + xc = xs = x0; + yc = ys = y0; + move((short)xs, (short)ys); + if ((x0 == x1) && (y0 == y1)) + flg = 0; + else flg = 1; + qs = quad_l(x, y, x0, y0); + qf = quad_l(x, y, x1, y1); + if (abs(x - x1) < abs(y - y1)) { + use = 'x'; + if ((qs == 2) || (qs == 3)) + m = -1; + else m = 1; + } else { + use = 'y'; + if (qs > 2) + m = -1; + else m = 1; + } + if (qs == qf) { + m0 = (y0 - y) / (x0 - x); + m1 = (y1 - y) / (x1 - x); + if (m0 >= m1) + qt = 4; + else qt = 0; + } else if ((qt = qf - qs) < 0) + qt += 4; + /*LINTED*/ + while (1) { + switch (use) { + case 'x': + if ((qs == 2) || (qs == 3)) + yc -= del; + else yc += del; + dy = yc - y; + pc = r - dy * dy; + xc = (int)(m * sqrt(pc) + x); + if (((x < xs) && (x >= xc)) || + ((x > xs) && (x <= xc)) || + ((y < ys) && (y >= yc)) || + ((y > ys) && (y <= yc))) { + if (++qtctr > qt) + return; + if (++qs > 4) + qs = 1; + if ((qs == 2) || (qs == 3)) + m = -1; + else m = 1; + flg = 1; + } + cont((short)xc, (short)yc); + xs = xc; + ys = yc; + if ((qs == qf) && (flg == 1)) + switch (qf) { + case 3: + case 4: + if (xs >= x1) + return; + continue; + case 1: + case 2: + if (xs <= x1) + return; + } + continue; + case 'y': + if (qs > 2) + xc += del; + else xc -= del; + dx = xc - x; + pc = r - dx * dx; + yc = (int)(m * sqrt(pc) + y); + if (((x < xs) && (x >= xc)) || + ((x > xs) && (x <= xc)) || + ((y < ys) && (y >= yc)) || + ((y > ys) && (y <= yc))) { + if (++qtctr > qt) + return; + if (++qs > 4) + qs = 1; + if (qs > 2) + m = -1; + else m = 1; + flg = 1; + } + cont((short)xc, (short)yc); + xs = xc; + ys = yc; + if ((qs == qf) && (flg == 1)) + switch (qs) { + case 1: + case 4: + if (ys >= y1) + return; + continue; + case 2: + case 3: + if (ys <= y1) + return; + } + } + } +} |