-/* -*- Mode: C; tab-width: 4 -*-
- * strange --- Strange attractors are not so hard to find...
- */
+/* -*- Mode: C; tab-width: 4 -*- */
+/* strange --- strange attractors */
+
#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)strange.c 4.02 97/04/01 xlockmore";
+static const char sccsid[] = "@(#)strange.c 5.00 2000/11/01 xlockmore";
+
#endif
-/* Copyright (c) 1997 by Massimino Pascal (Pascal.Massimon@ens.fr)
+/*-
+ * 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,
* 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.
+ * 01-Nov-2000: Allocation checks
+ * 10-May-1997: 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.
+ *
+ * strange attractors are not so hard to find...
*/
#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 */
+#define MODE_strange
+#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 */
-/*****************************************************/
-/*****************************************************/
+#ifdef MODE_strange
+
+ModeSpecOpt strange_opts =
+{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
+
+#ifdef USE_MODULES
+ModStruct strange_description =
+{"strange", "init_strange", "draw_strange", "release_strange",
+ "init_strange", "init_strange", (char *) NULL, &strange_opts,
+ 1000, 1, 1, 1, 64, 1.0, "",
+ "Shows strange attractors", 0, NULL};
+
+#endif
typedef float DBL;
typedef int PRM;
#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)<0 ? -A->Fold[ (-(a))&(UNIT2-1) ] : A->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 ) ) */
+#if 0
+#define DO_FOLD(a) (a)<-UNIT2 ? -A->Fold[(-(a))%UNIT2] : (a)<0 ? -A->Fold[ -(a) ] :\
+(a)>UNIT2 ? A->Fold[ (a)%UNIT2 ] : A->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 ) )
+#endif
/******************************************************************/
#define MAX_PRM 3*5
-typedef struct {
+typedef struct _ATTRACTOR {
DBL Prm1[MAX_PRM], Prm2[MAX_PRM];
- void (*Iterate) (PRM, PRM, PRM *, PRM *);
+ PRM Prm[MAX_PRM], *Fold;
+ void (*Iterate) (struct _ATTRACTOR *, 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;
+ 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 ATTRACTOR *Root = (ATTRACTOR *) NULL;
static DBL Amp_Prm[MAX_PRM] =
{
static DBL
Gauss_Rand(DBL c, DBL A, DBL S)
{
- DBL y,z;
+ DBL y;
y = (DBL) LRAND() / MAXRAND;
- z = curve / 10;
- y = A * (z - exp(-y * y * S)) / (z - exp(-S));
+ y = A * (1.0 - exp(-y * y * S)) / (1.0 - exp(-S));
if (NRAND(2))
return (c + y);
else
/* 2 examples of non-linear map */
static void
-Iterate_X2(PRM x, PRM y, PRM * xo, PRM * yo)
+Iterate_X2(ATTRACTOR * A, PRM x, PRM y, PRM * xo, PRM * yo)
{
PRM xx, yy, xy, x2y, y2x, Tmp;
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);
+ Tmp = A->Prm[1] * xx + A->Prm[2] * xy + A->Prm[3] * yy + A->Prm[4] * x2y;
+ Tmp = A->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);
+ Tmp = A->Prm[6] * xx + A->Prm[7] * xy + A->Prm[8] * yy + A->Prm[9] * y2x;
+ Tmp = A->Prm[5] + x + (Tmp / UNIT);
*yo = DO_FOLD(Tmp);
}
static void
-Iterate_X3(PRM x, PRM y, PRM * xo, PRM * yo)
+Iterate_X3(ATTRACTOR * A, PRM x, PRM y, PRM * xo, PRM * yo)
{
PRM xx, yy, xy, x2y, y2x, Tmp_x, Tmp_y, Tmp_z;
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 = A->Prm[1] * xx + A->Prm[2] * xy + A->Prm[3] * yy + A->Prm[4] * x2y;
+ Tmp_x = A->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 = A->Prm[6] * xx + A->Prm[7] * xy + A->Prm[8] * yy + A->Prm[9] * y2x;
+ Tmp_y = A->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 = A->Prm[11] * xx + A->Prm[12] * xy + A->Prm[13] * yy + A->Prm[14] * y2x;
+ Tmp_z = A->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 *) = {
+static void (*Funcs[2]) (ATTRACTOR *, PRM, PRM, PRM *, PRM *) = {
Iterate_X2, Iterate_X3
};
/***************************************************************/
+static void
+free_strange(Display *display, ATTRACTOR *A)
+{
+ if (A->Buffer1 != NULL) {
+ (void) free((void *) A->Buffer1);
+ A->Buffer1 = (XPoint *) NULL;
+ }
+ if (A->Buffer2 != NULL) {
+ (void) free((void *) A->Buffer2);
+ A->Buffer2 = (XPoint *) NULL;
+ }
+ if (A->dbuf) {
+ XFreePixmap(display, A->dbuf);
+ A->dbuf = None;
+ }
+ if (A->dbuf_gc) {
+ XFreeGC(display, A->dbuf_gc);
+ A->dbuf_gc = None;
+ }
+ if (A->Fold != NULL) {
+ (void) free((void *) A->Fold);
+ A->Fold = (PRM *) NULL;
+ }
+}
+
void
draw_strange(ModeInfo * mi)
{
- int i, j, n, Max_Colors, Cur_Pt;
+ int i, j, n, Cur_Pt;
PRM x, y, xo, yo;
DBL u;
- ATTRACTOR *A;
XPoint *Buf;
- Display *display;
- GC gc;
- Window window;
+ Display *display = MI_DISPLAY(mi);
+ Window window = MI_WINDOW(mi);
+ GC gc = MI_GC(mi);
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);
+ void (*Iterate) (ATTRACTOR *, PRM, PRM, PRM *, PRM *);
+ PRM xmin, xmax, ymin, ymax;
+ ATTRACTOR *A;
+ if (Root == NULL)
+ return;
A = &Root[MI_SCREEN(mi)];
+ if (A->Fold == NULL)
+ return;
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]);
+ A->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);
+ (*Iterate) (A, x, y, &xo, &yo);
x = xo + NRAND(8) - 4;
y = yo + NRAND(8) - 4;
}
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));
+ (*Iterate) (A, x, y, &xo, &yo);
+ Buf->x = (int) (Lx * (x + DBL_To_PRM(1.1)));
+ Buf->y = (int) (Ly * (DBL_To_PRM(1.1) - y));
/* (void) fprintf( stderr, "X,Y: %d %d ", Buf->x, Buf->y ); */
Buf++;
A->Cur_Pt++;
y = yo + NRAND(8) - 4;
}
- XSetForeground(display, gc, MI_WIN_BLACK_PIXEL(mi));
+ MI_IS_DRAWN(mi) = True;
- 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);
+ XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
- if (Max_Colors < 2)
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
+ if (A->dbuf != None) { /* 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 (MI_NPIXELS(mi) < 2)
+ XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
else
- XSetForeground(display, gc, MI_PIXEL(mi, A->Col % Max_Colors));
+ XSetForeground(display, gc, MI_PIXEL(mi, A->Col % MI_NPIXELS(mi)));
- if (A->dbuf)
- {
+ if (A->dbuf != None) {
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);
+ CoordModeOrigin);
+ XCopyPlane(display, A->dbuf, window, gc, 0, 0, A->Width, A->Height, 0, 0, 1);
+ } else
+ XDrawPoints(display, window, gc, A->Buffer2, A->Cur_Pt, CoordModeOrigin);
Buf = A->Buffer1;
A->Buffer1 = A->Buffer2;
void
init_strange(ModeInfo * mi)
{
+ Display *display = MI_DISPLAY(mi);
+ Window window = MI_WINDOW(mi);
+ GC gc = MI_GC(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)
+ if ((Root = (ATTRACTOR *) calloc(MI_NUM_SCREENS(mi),
+ sizeof (ATTRACTOR))) == NULL)
return;
}
- if (Fold == NULL) {
+ Attractor = &Root[MI_SCREEN(mi)];
+
+ if (Attractor->Fold == NULL) {
int i;
- Fold = (PRM *) calloc(UNIT2 + 1, sizeof (PRM));
- if (Fold == NULL)
+ if ((Attractor->Fold = (PRM *) calloc(UNIT2 + 1,
+ sizeof (PRM))) == NULL) {
+ free_strange(display, Attractor);
return;
+ }
for (i = 0; i <= UNIT2; ++i) {
DBL x;
/* x = x*(1.0-x)*4.0; */
x = (DBL) (i) / UNIT;
x = sin(x);
- Fold[i] = DBL_To_PRM(x);
+ Attractor->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->Buffer1 = (XPoint *) calloc(MAX_POINTS,
+ sizeof (XPoint))) == NULL) {
+ free_strange(display, Attractor);
+ return;
+ }
if (Attractor->Buffer2 == NULL)
- goto Abort;
+ if ((Attractor->Buffer2 = (XPoint *) calloc(MAX_POINTS,
+ sizeof (XPoint))) == NULL) {
+ free_strange(display, Attractor);
+ return;
+ }
Attractor->Max_Pt = MAX_POINTS;
- Attractor->Width = MI_WIN_WIDTH(mi);
- Attractor->Height = MI_WIN_HEIGHT(mi);
+ Attractor->Width = MI_WIDTH(mi);
+ Attractor->Height = MI_HEIGHT(mi);
Attractor->Cur_Pt = 0;
Attractor->Count = 0;
Attractor->Col = NRAND(MI_NPIXELS(mi));
Attractor->Iterate = Funcs[NRAND(2)];
Random_Prm(Attractor->Prm1);
Random_Prm(Attractor->Prm2);
+#ifndef NO_DBUF
+ if (Attractor->dbuf != None)
+ XFreePixmap(display, Attractor->dbuf);
+ Attractor->dbuf = XCreatePixmap(display, window,
+ Attractor->Width, Attractor->Height, 1);
+ /* Allocation checked */
+ if (Attractor->dbuf != None) {
+ XGCValues gcv;
- 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.graphics_exposures = False;
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;
+
+ if (Attractor->dbuf_gc != None)
+ XFreeGC(display, Attractor->dbuf_gc);
+
+ if ((Attractor->dbuf_gc = XCreateGC(display, Attractor->dbuf,
+ GCForeground | GCBackground | GCGraphicsExposures | GCFunction,
+ &gcv)) == None) {
+ XFreePixmap(display, Attractor->dbuf);
+ Attractor->dbuf = None;
+ } else {
+ XFillRectangle(display, Attractor->dbuf, Attractor->dbuf_gc,
+ 0, 0, Attractor->Width, Attractor->Height);
+ XSetBackground(display, gc, MI_BLACK_PIXEL(mi));
+ XSetFunction(display, gc, GXcopy);
+ }
+ }
+#endif
+
+ MI_CLEARWINDOW(mi);
+
+ /* Do not want any exposure events from XCopyPlane */
+ XSetGraphicsExposures(display, MI_GC(mi), False);
}
/***************************************************************/
void
release_strange(ModeInfo * mi)
{
- int i;
+ if (Root != NULL) {
+ int screen;
- 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);
+ for (screen = 0; screen < MI_NUM_SCREENS(mi); ++screen)
+ free_strange(MI_DISPLAY(mi), &Root[screen]);
+ (void) free((void *) Root);
+ Root = (ATTRACTOR *) NULL;
}
- free(Root);
- Root = NULL;
- if (Fold != NULL)
- free(Fold);
- Fold = NULL;
}
+
+#endif /* MODE_strange */
projects / xscreensaver / blobdiff