+++ /dev/null
-/* -*- Mode: C; tab-width: 4 -*-
- * strange --- Strange attractors are not so hard to find...
- */
-#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)strange.c 4.02 97/04/01 xlockmore";
-#endif
-
-/* Copyright (c) 1997 by Massimino Pascal (Pascal.Massimon@ens.fr)
- *
- * 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.
- *
- * This file is provided AS IS with no warranties of any kind. The author
- * shall have no liability with respect to the infringement of copyrights,
- * trade secrets or any patents by this file or any part thereof. In no
- * event will the author be liable for any lost revenue or profits or
- * other special, indirect and consequential damages.
- *
- * Revision History:
- * 30-Jul-98: sineswiper@resonatorsoft.com: added curve factor (discovered
- * while experimenting with the Gauss_Rand function).
- * 10-May-97: jwz@jwz.org: turned into a standalone program.
- * Made it render into an offscreen bitmap and then copy
- * that onto the screen, to reduce flicker.
- */
-
-#ifdef STANDALONE
-# define PROGCLASS "Strange"
-# define HACK_INIT init_strange
-# define HACK_DRAW draw_strange
-# define strange_opts xlockmore_opts
-# define DEFAULTS "*delay: 2000 \n" \
- "*ncolors: 100 \n"
-# define SMOOTH_COLORS
-# include "xlockmore.h" /* from the xscreensaver distribution */
-#else /* !STANDALONE */
-# include "xlock.h" /* from the xlockmore distribution */
-#endif /* !STANDALONE */
-
-/*****************************************************/
-/*****************************************************/
-
-typedef float DBL;
-typedef int PRM;
-
-#define UNIT (1<<12)
-#define UNIT2 (1<<14)
-/* #define UNIT2 (3140*UNIT/1000) */
-
-#define SKIP_FIRST 100
-#define MAX_POINTS 5500
-#define DBL_To_PRM(x) (PRM)( (DBL)(UNIT)*(x) )
-
-
-#define DO_FOLD(a) (a)<0 ? -Fold[ (-(a))&(UNIT2-1) ] : Fold[ (a)&(UNIT2-1) ]
-
-/*
- #define DO_FOLD(a) (a)<-UNIT2 ? -Fold[(-(a))%UNIT2] : (a)<0 ? -Fold[ -(a) ]
-
- : \ (a)>UNIT2 ? Fold[ (a)%UNIT2 ] : Fold[ (a) ] */
-/* #define DO_FOLD(a) DBL_To_PRM( sin( (DBL)(a)/UNIT ) ) */
-/*
- #define DO_FOLD(a) (a)<0 ? DBL_To_PRM( exp( 16.0*(a)/UNIT2 ) )-1.0 : \
- DBL_To_PRM( 1.0-exp( -16.0*(a)/UNIT2 ) ) */
-
-/******************************************************************/
-
-#define MAX_PRM 3*5
-
-typedef struct {
- DBL Prm1[MAX_PRM], Prm2[MAX_PRM];
- void (*Iterate) (PRM, PRM, PRM *, PRM *);
- XPoint *Buffer1, *Buffer2;
- int Cur_Pt, Max_Pt;
- int Col, Count, Speed;
- int Width, Height;
- Pixmap dbuf; /* jwz */
- GC dbuf_gc;
-} ATTRACTOR;
-
-static ATTRACTOR *Root;
-static PRM xmin, xmax, ymin, ymax;
-static PRM Prm[MAX_PRM];
-static PRM *Fold = NULL;
-
-static int curve;
-
-static XrmOptionDescRec opts[] =
-{
- {"-curve", ".strange.curve", XrmoptionSepArg, (caddr_t) "10"},
-};
-static OptionStruct desc[] =
-{
- {"-curve", "set the curve factor of the attractors"},
-};
-
-ModeSpecOpt strange_opts = { 1, opts, 0, NULL, desc };
-
-/******************************************************************/
-/******************************************************************/
-
-static DBL Amp_Prm[MAX_PRM] =
-{
- 1.0, 3.5, 3.5, 2.5, 4.7,
- 1.0, 3.5, 3.6, 2.5, 4.7,
- 1.0, 1.5, 2.2, 2.1, 3.5
-};
-static DBL Mid_Prm[MAX_PRM] =
-{
- 0.0, 1.5, 0.0, .5, 1.5,
- 0.0, 1.5, 0.0, .5, 1.5,
- 0.0, 1.5, -1.0, -.5, 2.5,
-};
-
-static DBL
-Gauss_Rand(DBL c, DBL A, DBL S)
-{
- DBL y,z;
-
- y = (DBL) LRAND() / MAXRAND;
- z = curve / 10;
- y = A * (z - exp(-y * y * S)) / (z - exp(-S));
- if (NRAND(2))
- return (c + y);
- else
- return (c - y);
-}
-
-static void
-Random_Prm(DBL * Prm)
-{
- int i;
-
- for (i = 0; i < MAX_PRM; ++i)
- Prm[i] = Gauss_Rand(Mid_Prm[i], Amp_Prm[i], 4.0);
-}
-
-/***************************************************************/
-
- /* 2 examples of non-linear map */
-
-static void
-Iterate_X2(PRM x, PRM y, PRM * xo, PRM * yo)
-{
- PRM xx, yy, xy, x2y, y2x, Tmp;
-
- xx = (x * x) / UNIT;
- x2y = (xx * y) / UNIT;
- yy = (y * y) / UNIT;
- y2x = (yy * x) / UNIT;
- xy = (x * y) / UNIT;
-
- Tmp = Prm[1] * xx + Prm[2] * xy + Prm[3] * yy + Prm[4] * x2y;
- Tmp = Prm[0] - y + (Tmp / UNIT);
- *xo = DO_FOLD(Tmp);
- Tmp = Prm[6] * xx + Prm[7] * xy + Prm[8] * yy + Prm[9] * y2x;
- Tmp = Prm[5] + x + (Tmp / UNIT);
- *yo = DO_FOLD(Tmp);
-}
-
-static void
-Iterate_X3(PRM x, PRM y, PRM * xo, PRM * yo)
-{
- PRM xx, yy, xy, x2y, y2x, Tmp_x, Tmp_y, Tmp_z;
-
- xx = (x * x) / UNIT;
- x2y = (xx * y) / UNIT;
- yy = (y * y) / UNIT;
- y2x = (yy * x) / UNIT;
- xy = (x * y) / UNIT;
-
- Tmp_x = Prm[1] * xx + Prm[2] * xy + Prm[3] * yy + Prm[4] * x2y;
- Tmp_x = Prm[0] - y + (Tmp_x / UNIT);
- Tmp_x = DO_FOLD(Tmp_x);
-
- Tmp_y = Prm[6] * xx + Prm[7] * xy + Prm[8] * yy + Prm[9] * y2x;
- Tmp_y = Prm[5] + x + (Tmp_y / UNIT);
-
- Tmp_y = DO_FOLD(Tmp_y);
-
- Tmp_z = Prm[11] * xx + Prm[12] * xy + Prm[13] * yy + Prm[14] * y2x;
- Tmp_z = Prm[10] + x + (Tmp_z / UNIT);
- Tmp_z = UNIT + Tmp_z * Tmp_z / UNIT;
-
- *xo = (Tmp_x * UNIT) / Tmp_z;
- *yo = (Tmp_y * UNIT) / Tmp_z;
-}
-
-static void (*Funcs[2]) (PRM, PRM, PRM *, PRM *) = {
- Iterate_X2, Iterate_X3
-};
-
-/***************************************************************/
-
-void
-draw_strange(ModeInfo * mi)
-{
- int i, j, n, Max_Colors, Cur_Pt;
- PRM x, y, xo, yo;
- DBL u;
- ATTRACTOR *A;
- XPoint *Buf;
- Display *display;
- GC gc;
- Window window;
- DBL Lx, Ly;
- void (*Iterate) (PRM, PRM, PRM *, PRM *);
-
- display = MI_DISPLAY(mi);
- window = MI_WINDOW(mi);
- gc = MI_GC(mi);
- Max_Colors = MI_NPIXELS(mi);
-
- A = &Root[MI_SCREEN(mi)];
-
- Cur_Pt = A->Cur_Pt;
- Iterate = A->Iterate;
-
- u = (DBL) (A->Count) / 1000.0;
- for (j = MAX_PRM - 1; j >= 0; --j)
- Prm[j] = DBL_To_PRM((1.0 - u) * A->Prm1[j] + u * A->Prm2[j]);
-
- x = y = DBL_To_PRM(.0);
- for (n = SKIP_FIRST; n; --n) {
- (*Iterate) (x, y, &xo, &yo);
- x = xo + NRAND(8) - 4;
- y = yo + NRAND(8) - 4;
- }
-
- xmax = 0;
- xmin = UNIT * 4;
- ymax = 0;
- ymin = UNIT * 4;
- A->Cur_Pt = 0;
- Buf = A->Buffer2;
- Lx = (DBL) A->Width / UNIT / 2.2;
- Ly = (DBL) A->Height / UNIT / 2.2;
- for (n = A->Max_Pt; n; --n) {
- (*Iterate) (x, y, &xo, &yo);
- Buf->x = (short) (Lx * (x + DBL_To_PRM(1.1)));
- Buf->y = (short) (Ly * (DBL_To_PRM(1.1) - y));
- /* (void) fprintf( stderr, "X,Y: %d %d ", Buf->x, Buf->y ); */
- Buf++;
- A->Cur_Pt++;
- if (xo > xmax)
- xmax = xo;
- else if (xo < xmin)
- xmin = xo;
- if (yo > ymax)
- ymax = yo;
- else if (yo < ymin)
- ymin = yo;
- x = xo + NRAND(8) - 4;
- y = yo + NRAND(8) - 4;
- }
-
- XSetForeground(display, gc, MI_WIN_BLACK_PIXEL(mi));
-
- if (A->dbuf) /* jwz */
- {
- XSetForeground(display, A->dbuf_gc, 0);
-/* XDrawPoints(display, A->dbuf, A->dbuf_gc, A->Buffer1,
- Cur_Pt,CoordModeOrigin);*/
- XFillRectangle(display, A->dbuf, A->dbuf_gc, 0,0, A->Width, A->Height);
- }
- else
- XDrawPoints(display, window, gc, A->Buffer1, Cur_Pt, CoordModeOrigin);
-
- if (Max_Colors < 2)
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
- else
- XSetForeground(display, gc, MI_PIXEL(mi, A->Col % Max_Colors));
-
- if (A->dbuf)
- {
- XSetForeground(display, A->dbuf_gc, 1);
- XDrawPoints(display, A->dbuf, A->dbuf_gc, A->Buffer2, A->Cur_Pt,
- CoordModeOrigin);
- }
- else
- XDrawPoints(display, window, gc, A->Buffer2, A->Cur_Pt, CoordModeOrigin);
-
- if (A->dbuf)
- XCopyPlane(display, A->dbuf, window, gc, 0,0,A->Width,A->Height,0,0, 1);
-
- Buf = A->Buffer1;
- A->Buffer1 = A->Buffer2;
- A->Buffer2 = Buf;
-
- if ((xmax - xmin < DBL_To_PRM(.2)) && (ymax - ymin < DBL_To_PRM(.2)))
- A->Count += 4 * A->Speed;
- else
- A->Count += A->Speed;
- if (A->Count >= 1000) {
- for (i = MAX_PRM - 1; i >= 0; --i)
- A->Prm1[i] = A->Prm2[i];
- Random_Prm(A->Prm2);
- A->Count = 0;
- }
- A->Col++;
-}
-
-
-/***************************************************************/
-
-void
-init_strange(ModeInfo * mi)
-{
- ATTRACTOR *Attractor;
-
- curve = get_integer_resource ("curve", "Integer");
- if (curve <= 0) curve = 10;
-
- if (Root == NULL) {
- Root = (ATTRACTOR *) calloc(
- MI_NUM_SCREENS(mi), sizeof (ATTRACTOR));
- if (Root == NULL)
- return;
- }
- if (Fold == NULL) {
- int i;
-
- Fold = (PRM *) calloc(UNIT2 + 1, sizeof (PRM));
- if (Fold == NULL)
- return;
- for (i = 0; i <= UNIT2; ++i) {
- DBL x;
-
- /* x = ( DBL )(i)/UNIT2; */
- /* x = sin( M_PI/2.0*x ); */
- /* x = sqrt( x ); */
- /* x = x*x; */
- /* x = x*(1.0-x)*4.0; */
- x = (DBL) (i) / UNIT;
- x = sin(x);
- Fold[i] = DBL_To_PRM(x);
- }
- }
- Attractor = &Root[MI_SCREEN(mi)];
-
- Attractor->Buffer1 = (XPoint *) calloc(MAX_POINTS, sizeof (XPoint));
- if (Attractor->Buffer1 == NULL)
- goto Abort;
- Attractor->Buffer2 = (XPoint *) calloc(MAX_POINTS, sizeof (XPoint));
- if (Attractor->Buffer2 == NULL)
- goto Abort;
- Attractor->Max_Pt = MAX_POINTS;
-
- Attractor->Width = MI_WIN_WIDTH(mi);
- Attractor->Height = MI_WIN_HEIGHT(mi);
- Attractor->Cur_Pt = 0;
- Attractor->Count = 0;
- Attractor->Col = NRAND(MI_NPIXELS(mi));
- Attractor->Speed = 4;
-
- Attractor->Iterate = Funcs[NRAND(2)];
- Random_Prm(Attractor->Prm1);
- Random_Prm(Attractor->Prm2);
-
- Attractor->dbuf = XCreatePixmap(MI_DISPLAY(mi), MI_WINDOW(mi),
- Attractor->Width, Attractor->Height, 1);
- if (Attractor->dbuf)
- {
- XGCValues gcv;
- gcv.foreground = 0;
- gcv.background = 0;
- gcv.function = GXcopy;
- Attractor->dbuf_gc = XCreateGC(MI_DISPLAY(mi), Attractor->dbuf,
- GCForeground|GCBackground|GCFunction,
- &gcv);
- XFillRectangle(MI_DISPLAY(mi), Attractor->dbuf,
- Attractor->dbuf_gc, 0,0, Attractor->Width,
- Attractor->Height);
- XSetBackground(MI_DISPLAY(mi), MI_GC(mi), MI_WIN_BLACK_PIXEL(mi));
- XSetFunction(MI_DISPLAY(mi), MI_GC(mi), GXcopy);
- }
-
- XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
- return;
-
- Abort:
- if (Attractor->Buffer1 != NULL)
- free(Attractor->Buffer1);
- if (Attractor->Buffer2 != NULL)
- free(Attractor->Buffer2);
- Attractor->Buffer1 = NULL;
- Attractor->Buffer2 = NULL;
- Attractor->Cur_Pt = 0;
- return;
-}
-
-/***************************************************************/
-
-void
-release_strange(ModeInfo * mi)
-{
- int i;
-
- if (Root == NULL)
- return;
-
- for (i = 0; i < MI_NUM_SCREENS(mi); ++i) {
- if (Root[i].Buffer1 != NULL)
- free(Root[i].Buffer1);
- if (Root[i].Buffer2 != NULL)
- free(Root[i].Buffer2);
- if (Root[i].dbuf)
- XFreePixmap(MI_DISPLAY(mi), Root[i].dbuf);
- if (Root[i].dbuf_gc)
- XFreeGC(MI_DISPLAY(mi), Root[i].dbuf_gc);
- }
- free(Root);
- Root = NULL;
- if (Fold != NULL)
- free(Fold);
- Fold = NULL;
-}
projects / xscreensaver / blobdiff