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+/* $Xorg: do_lines.c,v 1.3 2000/08/17 19:54:09 cpqbld Exp $ */
+/*****************************************************************************
+Copyright 1988, 1989 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************************/
+
+#include "x11perf.h"
+
+static XPoint *points;
+static GC pgc;
+
+static void GenerateLines(xp, p, ddashed)
+ XParms xp;
+ Parms p;
+ Bool ddashed;
+{
+ int size;
+ int half; /* Half of width if wide line */
+ int i;
+ int rows; /* Number of rows filled in current column */
+ int x, y; /* Next point */
+ int xdir, ydir; /* Which direction x, y are going */
+ int bigxdir;
+ int x1, y1; /* offsets to compute next point from current */
+ int phase; /* how far into 0..4*(size_1) we are */
+ float phasef; /* how far we are in real numbers */
+ float phaseinc; /* how much to increment phasef at each segment */
+ int size4; /* 4 * size */
+
+ if(ddashed)
+ pgc = xp->ddfggc;
+ else
+ pgc = xp->fggc;
+
+ size = p->special;
+ size4 = 4 * (size+1);
+ half = (size + 19) / 20;
+
+ points = (XPoint *)malloc((p->objects+1) * sizeof(XPoint));
+
+ /* All this x, x1, x1inc, etc. stuff is to create a pattern that
+ (1) scans down the screen vertically
+
+ (2) rotates the endpoints through all possible orientations
+
+ (3) bounces off bottom and top of window as needed
+
+ (4) moves left or right at each bounce to make things less boring
+ */
+
+ x = half;
+ y = half;
+ xdir = 1;
+ ydir = 1;
+ bigxdir = 1;
+ phasef = 0.0;
+ phaseinc = ((float)size4) / ((float)p->objects);
+ if (phaseinc < 1.0) phaseinc = 1.0;
+ rows = 0;
+
+ points[0].x = x;
+ points[0].y = y;
+
+ for (i = 1; i != (p->objects+1); i++) {
+ phase = phasef;
+ switch (phase / (size+1)) {
+ case 0:
+ x1 = size;
+ y1 = phase;
+ break;
+
+ case 1:
+ x1 = size - phase % (size+1);
+ y1 = size;
+ break;
+
+ case 2:
+ x1 = phase % (size+1);
+ y1 = size;
+ break;
+
+ case 3:
+ x1 = size;
+ y1 = size - phase % (size+1);
+ break;
+ } /* end switch */
+
+ /* Move down or up the screen */
+ y += (ydir * y1);
+
+ /* If off either top or bottom, backtrack to previous position and go
+ the other way instead. Also move in bigxdir if not already. */
+ rows++;
+ if (y < half || y >= (HEIGHT-half) || rows > MAXROWS) {
+ rows = 0;
+ if (bigxdir > 0) {
+ if (x + size < WIDTH - half) {
+ xdir = 1;
+ } else {
+ bigxdir = -1;
+ }
+ } else {
+ if (x - size > half) {
+ xdir = -1;
+ } else {
+ bigxdir = 1;
+ }
+ }
+ ydir = -ydir;
+ y += (2 * ydir * y1);
+ /* If still off top or bottom, we can't do the line we want.
+ This will happen infrequently if the window is not twice the
+ length of the line. So instead, let's draw a line that puts
+ the line after this approximately through the center of the
+ window. Since it is very unlikely that both x and y will
+ need such adjustment, line length (in pixels) should not
+ change...we just can't get the slope we want for this line. */
+ if (y < half) {
+ y = (HEIGHT - y1)/2;
+ ydir = 1;
+ } else if (y > (HEIGHT - half)) {
+ y = (HEIGHT + y1)/2;
+ ydir = -1;
+ }
+ }
+
+ /* Move x left or right by x1 */
+ x += (xdir * x1);
+ xdir = -xdir;
+ /* Again, if we are off the bottom then we can't really draw the line
+ we want. */
+ if (x < half) {
+ x = (WIDTH - x1)/2;
+ xdir = 1;
+ } else if (x > (WIDTH - half)) {
+ x = (WIDTH + x1)/2;
+ xdir = -1;
+ }
+ points[i].x = x;
+ points[i].y = y;
+
+ /* Increment phasef */
+ phasef += phaseinc;
+ if (phasef >= size4) phasef -= size4;
+
+ }
+}
+
+int InitLines(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ GenerateLines(xp, p, False);
+ return reps;
+}
+
+static int GenerateWideLines(xp, p, reps, ddashed)
+ XParms xp;
+ Parms p;
+ int reps;
+ Bool ddashed;
+{
+ int size;
+
+ GenerateLines(xp, p, ddashed);
+
+ size = p->special;
+ if(ddashed) {
+ XSetLineAttributes(xp->d, xp->ddbggc, (int) ((size + 9) / 10),
+ LineSolid, CapRound, JoinRound);
+ XSetLineAttributes(xp->d, xp->ddfggc, (int) ((size + 9) / 10),
+ LineSolid, CapRound, JoinRound);
+ }
+ else {
+ XSetLineAttributes(xp->d, xp->bggc, (int) ((size + 9) / 10),
+ LineSolid, CapRound, JoinRound);
+ XSetLineAttributes(xp->d, xp->fggc, (int) ((size + 9) / 10),
+ LineSolid, CapRound, JoinRound);
+ }
+
+ return reps;
+}
+
+int InitWideLines(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ return GenerateWideLines(xp, p, reps, False);
+}
+
+int InitDashedLines(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ char dashes[2];
+
+ GenerateLines(xp, p, False);
+
+ /* Modify GCs to draw dashed */
+ XSetLineAttributes(xp->d, xp->bggc, 0, LineOnOffDash, CapButt, JoinMiter);
+ XSetLineAttributes(xp->d, xp->fggc, 0, LineOnOffDash, CapButt, JoinMiter);
+ dashes[0] = 3; dashes[1] = 2;
+ XSetDashes(xp->d, xp->fggc, 0, dashes, 2);
+ XSetDashes(xp->d, xp->bggc, 0, dashes, 2);
+ return reps;
+}
+
+int InitWideDashedLines(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ int size;
+ XGCValues gcv;
+ char dashes[2];
+
+ (void)GenerateWideLines(xp, p, reps, False);
+ size = p->special;
+ size = (size + 9) / 10;
+
+ /* Modify GCs to draw dashed */
+ dashes[0] = 2*size; dashes[1] = 2*size;
+ gcv.line_style = LineOnOffDash;
+ XChangeGC(xp->d, xp->fggc, GCLineStyle, &gcv);
+ XChangeGC(xp->d, xp->bggc, GCLineStyle, &gcv);
+ XSetDashes(xp->d, xp->fggc, 0, dashes, 2);
+ XSetDashes(xp->d, xp->bggc, 0, dashes, 2);
+ return reps;
+}
+
+int InitDoubleDashedLines(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ char dashes[2];
+
+ GenerateLines(xp, p, True);
+
+ /* Modify GCs to draw dashed */
+ XSetLineAttributes(xp->d, xp->ddbggc, 0, LineDoubleDash, CapButt, JoinMiter);
+ XSetLineAttributes(xp->d, xp->ddfggc, 0, LineDoubleDash, CapButt, JoinMiter);
+ dashes[0] = 3; dashes[1] = 2;
+ XSetDashes(xp->d, xp->ddfggc, 0, dashes, 2);
+ XSetDashes(xp->d, xp->ddbggc, 0, dashes, 2);
+ return reps;
+}
+
+int InitWideDoubleDashedLines(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ int size;
+ XGCValues gcv;
+ char dashes[2];
+
+ (void)GenerateWideLines(xp, p, reps, True);
+ size = p->special;
+ size = (size + 9) / 10;
+
+ /* Modify GCs to draw dashed */
+ dashes[0] = 2*size; dashes[1] = 2*size;
+ gcv.line_style = LineDoubleDash;
+ XChangeGC(xp->d, xp->ddfggc, GCLineStyle, &gcv);
+ XChangeGC(xp->d, xp->ddbggc, GCLineStyle, &gcv);
+ XSetDashes(xp->d, xp->ddfggc, 0, dashes, 2);
+ XSetDashes(xp->d, xp->ddbggc, 0, dashes, 2);
+ return reps;
+}
+
+void DoLines(xp, p, reps)
+ XParms xp;
+ Parms p;
+ int reps;
+{
+ int i;
+
+ for (i = 0; i != reps; i++)
+ {
+ XDrawLines(xp->d, xp->w, pgc, points, p->objects+1, CoordModeOrigin);
+ if (pgc == xp->ddbggc)
+ pgc = xp->ddfggc;
+ else if(pgc == xp->ddfggc)
+ pgc = xp->ddbggc;
+ else if (pgc == xp->bggc)
+ pgc = xp->fggc;
+ else
+ pgc = xp->bggc;
+ }
+}
+
+void EndLines(xp, p)
+ XParms xp;
+ Parms p;
+{
+ free(points);
+}
+
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