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IABSD.fr/xenocara/app/x11perf/do_lines.c
matthieu
- app/x11perf/do_lines.c
-
/* $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. ******************************************************************************/ /* $XFree86: xc/programs/x11perf/do_lines.c,v 1.4 2000/11/29 08:58:19 keithp Exp $ */ #include "x11perf.h" static XPoint *points; static GC pgc; static void GenerateLines(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 = 0, y1 = 0; /* 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(XParms xp, Parms p, int reps) { GenerateLines(xp, p, False); return reps; } static int GenerateWideLines(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(XParms xp, Parms p, int reps) { return GenerateWideLines(xp, p, reps, False); } int InitDashedLines(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(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(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(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(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; CheckAbort (); } } void EndLines(XParms xp, Parms p) { free(points); }