X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=hacks%2Flmorph.c;h=9468a72ac1642129fc61456e9690d8f9b1689aa6;hb=49f5b54f312fe4ac2e9bc47581a72451bd0e8439;hp=11099d26bcb58ced25ff3b344f8f44ba9705ae95;hpb=df7adbee81405e2849728a24b498ad2117784b1f;p=xscreensaver diff --git a/hacks/lmorph.c b/hacks/lmorph.c index 11099d26..9468a72a 100644 --- a/hacks/lmorph.c +++ b/hacks/lmorph.c @@ -1,67 +1,77 @@ - -/************************************************************************** - * - * FILE lmorph.c - * MODULE OF xscreensaver - * - * DESCRIPTION Bilinear interpolation for morphing line shapes. - * - * WRITTEN BY Sverre H. Huseby Glenn T. Lines - * Kurvn. 30 Østgaardsgt. 5 - * N-0495 Oslo N-0474 Oslo - * Norway Norway - * - * Phone: +47 901 63 579 Phone: +47 22 04 67 28 - * E-mail: sverrehu@online.no E-mail: gtl@si.sintef.no - * URL: http://home.sol.no/~sverrehu/ - * - * The original idea, and the bilinear interpolation - * mathematics used, emerged in the head of the wise - * Glenn T. Lines. - * - * MODIFICATIONS june 1998 (shh) - * * Minor code cleanup. +/* lmorph, Copyright (c) 1993-1999 Sverre H. Huseby and Glenn T. Lines * - * march 1997 (shh) - * * Added -mailfile option to allow checking for - * new mail while the screensaver is active. - * - * january 1997 (shh) - * * Some code reformatting. - * * Added possibility to use float arithmetic. - * * Added -figtype option. - * * Made color blue default. - * - * december 1995 (jwz) - * * Function headers converted from ANSI to K&R. - * * Added posibility for random number of steps, and - * made this the default. - * - * march 1995 (shh) - * * Converted from an MS-Windows program to X Window. - * - **************************************************************************/ + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that + * copyright notice and this permission notice appear in supporting + * documentation. No representations are made about the suitability of this + * software for any purpose. It is provided "as is" without express or + * implied warranty. + */ + +/*------------------------------------------------------------------------ + | + | FILE lmorph.c + | MODULE OF xscreensaver + | + | DESCRIPTION Smooth and non-linear morphing between 1D curves. + | + | WRITTEN BY Sverre H. Huseby Glenn T. Lines + | Kurvn. 30 Østgaardsgt. 5 + | N-0495 Oslo N-0474 Oslo + | Norway Norway + | + | Phone: +47 901 63 579 Phone: +47 22 04 67 28 + | E-mail: sverrehu@online.no E-mail: glennli@ifi.uio.no + | URL: http://home.sol.no/~sverrehu/ + | + | The original idea, and the bilinear interpolation + | mathematics used, emerged in the head of the wise + | Glenn T. Lines. + | + | MODIFICATIONS october 1999 (shh) + | * Removed option to use integer arithmetic. + | * Increased default number of points, and brightened + | the foreground color a little bit. + | * Minor code cleanup (very minor, that is). + | * Default number of steps is no longer random. + | * Added -linewidth option (and resource). + | + | october 1999 (gtl) + | * Added cubic interpolation between shapes + | * Added non-linear transformation speed + | + | june 1998 (shh) + | * Minor code cleanup. + | + | january 1997 (shh) + | * Some code reformatting. + | * Added possibility to use float arithmetic. + | * Added -figtype option. + | * Made color blue default. + | + | december 1995 (jwz) + | * Function headers converted from ANSI to K&R. + | * Added posibility for random number of steps, and + | made this the default. + | + | march 1995 (shh) + | * Converted from an MS-Windows program to X Window. + | + | november 1993 (gtl, shh, lots of beer) + | * Original Windows version (we didn't know better). + +----------------------------------------------------------------------*/ -#include -#include -#include #include #include "screenhack.h" -/************************************************************************** - * * - * P R I V A T E D A T A * - * * - **************************************************************************/ +/*-----------------------------------------------------------------------+ +| PRIVATE DATA | ++-----------------------------------------------------------------------*/ /* define MARGINS to make some space around the figure. */ #define MARGINS -/* define USE_FLOAT to avoid using integer calculations in - createPoints. integer calculation is supposed to be faster, but it - won't work for displays larger than 2048x2048 or so pixels. */ -#undef USE_FLOAT - #define MAXFIGS 20 #define TWO_PI (2.0 * M_PI) #define RND(x) (random() % (x)) @@ -70,64 +80,65 @@ #define FT_CLOSED 2 #define FT_ALL (FT_OPEN | FT_CLOSED) -static int - numFigs = 0, /* number of figure arrays. */ - numPoints, /* number of points in each array. */ - nWork, /* current work array number. */ - nFrom, /* current from array number. */ - nTo, /* current to array number. */ - figType; -static long delay; /* usecs to wait between updates. */ -static XPoint - *aWork[2], /* working arrays. */ - *a[MAXFIGS], /* the figure arrays. */ - *aTmp, /* used as source when interrupting morph */ - *aPrev, /* previous points displayed. */ - *aCurr, /* the current points displayed. */ - *aFrom, /* figure converting from. */ - *aTo; /* figure converting to. */ -static int scrWidth, scrHeight; -static double currGamma, maxGamma = 1.0, deltaGamma; -static GC gcDraw, gcClear; -static Display *dpy; -static Window window; - - - -/************************************************************************** - * * - * P U B L I C D A T A * - * * - **************************************************************************/ - -char *progclass = "LMorph"; - -char *defaults [] = { +struct state { + Display *dpy; + Window window; + + int numFigs; /* number of figure arrays. */ + int numPoints; /* number of points in each array. */ + int nWork; /* current work array number. */ + int nFrom; /* current from array number. */ + int nTo; /* current to array number. */ + int nNext; /* current next array number (after to).*/ + int shift; /* shifts the starting point of a figure */ + int figType; + + long delay; /* usecs to wait between updates. */ + + XPoint *aWork[2]; /* working arrays. */ + XPoint *a[MAXFIGS]; /* the figure arrays. */ + XPoint *aTmp; /* used as source when interrupting morph */ + XPoint *aPrev; /* previous points displayed. */ + XPoint *aCurr; /* the current points displayed. */ + XPoint *aFrom; /* figure converting from. */ + XPoint *aTo; /* figure converting to. */ + XPoint *aNext; /* figure converting to next time. */ + XPoint *aSlopeFrom; /* slope at start of morph */ + XPoint *aSlopeTo; /* slope at end of morph */ + + int scrWidth, scrHeight; + double currGamma, maxGamma, deltaGamma; + GC gcDraw, gcClear; +}; + + +/*-----------------------------------------------------------------------+ +| PUBLIC DATA | ++-----------------------------------------------------------------------*/ + +static const char *lmorph_defaults [] = { ".background: black", - ".foreground: blue", - "*points: 150", - "*steps: 0", - "*delay: 50000", + ".foreground: #4444FF", + "*points: 200", + "*steps: 150", + "*delay: 70000", "*figtype: all", + "*linewidth: 5", 0 }; -XrmOptionDescRec options [] = { - { "-points", ".points", XrmoptionSepArg, 0 }, - { "-steps", ".steps", XrmoptionSepArg, 0 }, - { "-delay", ".delay", XrmoptionSepArg, 0 }, - { "-figtype", ".figtype", XrmoptionSepArg, 0 }, - { 0, 0, 0, 0 } +static XrmOptionDescRec lmorph_options [] = { + { "-points", ".points", XrmoptionSepArg, 0 }, + { "-steps", ".steps", XrmoptionSepArg, 0 }, + { "-delay", ".delay", XrmoptionSepArg, 0 }, + { "-figtype", ".figtype", XrmoptionSepArg, 0 }, + { "-linewidth", ".linewidth", XrmoptionSepArg, 0 }, + { 0, 0, 0, 0 } }; -int options_size = (sizeof (options) / sizeof (options[0])); - - -/************************************************************************** - * * - * P R I V A T E F U N C T I O N S * - * * - **************************************************************************/ +/*-----------------------------------------------------------------------+ +| PRIVATE FUNCTIONS | ++-----------------------------------------------------------------------*/ static void * xmalloc(size_t size) @@ -142,171 +153,173 @@ xmalloc(size_t size) } static void -initPointArrays(void) +initPointArrays(struct state *st) { - int q, w, - mx, my, /* max screen coordinates. */ - mp, /* max point number. */ - s, rx, ry, - marginx, marginy; + int q, w; + int mx, my; /* max screen coordinates. */ + int mp; /* max point number. */ + int s, rx, ry; + int marginx, marginy; double scalex, scaley; - mx = scrWidth - 1; - my = scrHeight - 1; - mp = numPoints - 1; + mx = st->scrWidth - 1; + my = st->scrHeight - 1; + mp = st->numPoints - 1; - aWork[0] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); - aWork[1] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); - aTmp = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); + st->aWork[0] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); + st->aWork[1] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); + st->aTmp = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); - if (figType & FT_CLOSED) { + if (st->figType & FT_CLOSED) { /* rectangle */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); - s = numPoints / 4; + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); + s = st->numPoints / 4; for (q = 0; q < s; q++) { - a[numFigs][q].x = ((double) q / s) * mx; - a[numFigs][q].y = 0; - a[numFigs][s + q].x = mx; - a[numFigs][s + q].y = ((double) q / s) * my; - a[numFigs][2 * s + q].x = mx - ((double) q / s) * mx; - a[numFigs][2 * s + q].y = my; - a[numFigs][3 * s + q].x = 0; - a[numFigs][3 * s + q].y = my - ((double) q / s) * my; + st->a[st->numFigs][q].x = ((double) q / s) * mx; + st->a[st->numFigs][q].y = 0; + st->a[st->numFigs][s + q].x = mx; + st->a[st->numFigs][s + q].y = ((double) q / s) * my; + st->a[st->numFigs][2 * s + q].x = mx - ((double) q / s) * mx; + st->a[st->numFigs][2 * s + q].y = my; + st->a[st->numFigs][3 * s + q].x = 0; + st->a[st->numFigs][3 * s + q].y = my - ((double) q / s) * my; } - for (q = 4 * s; q < numPoints; q++) - a[numFigs][q].x = a[numFigs][q].y = 0; - a[numFigs][mp].x = a[numFigs][0].x; - a[numFigs][mp].y = a[numFigs][0].y; - ++numFigs; + for (q = 4 * s; q < st->numPoints; q++) + st->a[st->numFigs][q].x = st->a[st->numFigs][q].y = 0; + st->a[st->numFigs][mp].x = st->a[st->numFigs][0].x; + st->a[st->numFigs][mp].y = st->a[st->numFigs][0].y; + ++st->numFigs; /* */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); rx = mx / 2; ry = my / 2; - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = mx / 2 + rx * sin(1 * TWO_PI * (double) q / mp); - a[numFigs][q].y = my / 2 + ry * cos(3 * TWO_PI * (double) q / mp); + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = mx / 2 + rx * sin(1 * TWO_PI * (double) q / mp); + st->a[st->numFigs][q].y = my / 2 + ry * cos(3 * TWO_PI * (double) q / mp); } - a[numFigs][mp].x = a[numFigs][0].x; - a[numFigs][mp].y = a[numFigs][0].y; - ++numFigs; + st->a[st->numFigs][mp].x = st->a[st->numFigs][0].x; + st->a[st->numFigs][mp].y = st->a[st->numFigs][0].y; + ++st->numFigs; /* */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); rx = mx / 2; ry = my / 2; - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = mx / 2 + ry * sin(3 * TWO_PI * (double) q / mp); - a[numFigs][q].y = my / 2 + ry * cos(1 * TWO_PI * (double) q / mp); + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = mx / 2 + ry * sin(3 * TWO_PI * (double) q / mp); + st->a[st->numFigs][q].y = my / 2 + ry * cos(1 * TWO_PI * (double) q / mp); } - a[numFigs][mp].x = a[numFigs][0].x; - a[numFigs][mp].y = a[numFigs][0].y; - ++numFigs; + st->a[st->numFigs][mp].x = st->a[st->numFigs][0].x; + st->a[st->numFigs][mp].y = st->a[st->numFigs][0].y; + ++st->numFigs; /* */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); rx = mx / 2; ry = my / 2; - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = mx / 2 + ry + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = mx / 2 + ry * (0.8 - 0.2 * sin(30 * TWO_PI * q / mp)) * sin(TWO_PI * (double) q / mp); - a[numFigs][q].y = my / 2 + ry + st->a[st->numFigs][q].y = my / 2 + ry * (0.8 - 0.2 * sin(30 * TWO_PI * q / mp)) * cos(TWO_PI * (double) q / mp); } - a[numFigs][mp].x = a[numFigs][0].x; - a[numFigs][mp].y = a[numFigs][0].y; - ++numFigs; + st->a[st->numFigs][mp].x = st->a[st->numFigs][0].x; + st->a[st->numFigs][mp].y = st->a[st->numFigs][0].y; + ++st->numFigs; - /* */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); + + /* */ + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); rx = mx / 2; ry = my / 2; - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = mx / 2 + ry * sin(TWO_PI * (double) q / mp); - a[numFigs][q].y = my / 2 + ry * cos(TWO_PI * (double) q / mp); + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = mx / 2 + ry * sin(TWO_PI * (double) q / mp); + st->a[st->numFigs][q].y = my / 2 + ry * cos(TWO_PI * (double) q / mp); } - a[numFigs][mp].x = a[numFigs][0].x; - a[numFigs][mp].y = a[numFigs][0].y; - ++numFigs; + st->a[st->numFigs][mp].x = st->a[st->numFigs][0].x; + st->a[st->numFigs][mp].y = st->a[st->numFigs][0].y; + ++st->numFigs; + /* */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); rx = mx / 2; ry = my / 2; - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = mx / 2 + rx * cos(TWO_PI * (double) q / mp); - a[numFigs][q].y = my / 2 + ry * sin(TWO_PI * (double) q / mp); + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = mx / 2 + rx * cos(TWO_PI * (double) q / mp); + st->a[st->numFigs][q].y = my / 2 + ry * sin(TWO_PI * (double) q / mp); } - a[numFigs][mp].x = a[numFigs][0].x; - a[numFigs][mp].y = a[numFigs][0].y; - ++numFigs; + st->a[st->numFigs][mp].x = st->a[st->numFigs][0].x; + st->a[st->numFigs][mp].y = st->a[st->numFigs][0].y; + ++st->numFigs; /* */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); rx = mx / 2; ry = my / 2; - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = mx / 2 + rx * sin(2 * TWO_PI * (double) q / mp); - a[numFigs][q].y = my / 2 + ry * cos(3 * TWO_PI * (double) q / mp); + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = mx / 2 + rx * sin(2 * TWO_PI * (double) q / mp); + st->a[st->numFigs][q].y = my / 2 + ry * cos(3 * TWO_PI * (double) q / mp); } - a[numFigs][mp].x = a[numFigs][0].x; - a[numFigs][mp].y = a[numFigs][0].y; - ++numFigs; + st->a[st->numFigs][mp].x = st->a[st->numFigs][0].x; + st->a[st->numFigs][mp].y = st->a[st->numFigs][0].y; + ++st->numFigs; } - if (figType & FT_OPEN) { + if (st->figType & FT_OPEN) { /* sine wave, one period */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = ((double) q / numPoints) * mx; - a[numFigs][q].y = (1.0 - sin(((double) q / mp) * TWO_PI)) + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = ((double) q / st->numPoints) * mx; + st->a[st->numFigs][q].y = (1.0 - sin(((double) q / mp) * TWO_PI)) * my / 2.0; } - ++numFigs; + ++st->numFigs; /* */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = ((double) q / mp) * mx; - a[numFigs][q].y = (1.0 - cos(((double) q / mp) * 3 * TWO_PI)) + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = ((double) q / mp) * mx; + st->a[st->numFigs][q].y = (1.0 - cos(((double) q / mp) * 3 * TWO_PI)) * my / 2.0; } - ++numFigs; + ++st->numFigs; /* spiral, one endpoint at bottom */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); rx = mx / 2; ry = my / 2; - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = mx / 2 + ry * sin(5 * TWO_PI * (double) q / mp) + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = mx / 2 + ry * sin(5 * TWO_PI * (double) q / mp) * ((double) q / mp); - a[numFigs][q].y = my / 2 + ry * cos(5 * TWO_PI * (double) q / mp) + st->a[st->numFigs][q].y = my / 2 + ry * cos(5 * TWO_PI * (double) q / mp) * ((double) q / mp); } - ++numFigs; + ++st->numFigs; /* spiral, one endpoint at top */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); rx = mx / 2; ry = my / 2; - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = mx / 2 + ry * sin(6 * TWO_PI * (double) q / mp) + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = mx / 2 + ry * sin(6 * TWO_PI * (double) q / mp) * ((double) q / mp); - a[numFigs][q].y = my / 2 - ry * cos(6 * TWO_PI * (double) q / mp) + st->a[st->numFigs][q].y = my / 2 - ry * cos(6 * TWO_PI * (double) q / mp) * ((double) q / mp); } - ++numFigs; + ++st->numFigs; /* */ - a[numFigs] = (XPoint *) xmalloc(numPoints * sizeof(XPoint)); - for (q = 0; q < numPoints; q++) { - a[numFigs][q].x = ((double) q / mp) * mx; - a[numFigs][q].y = (1.0 - sin(((double) q / mp) * 5 * TWO_PI)) + st->a[st->numFigs] = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); + for (q = 0; q < st->numPoints; q++) { + st->a[st->numFigs][q].x = ((double) q / mp) * mx; + st->a[st->numFigs][q].y = (1.0 - sin(((double) q / mp) * 5 * TWO_PI)) * my / 2.0; } - ++numFigs; + ++st->numFigs; } #ifdef MARGINS @@ -315,126 +328,143 @@ initPointArrays(void) marginy = (my + 1) / 10; scalex = (double) ((mx + 1) - 2.0 * marginx) / (mx + 1.0); scaley = (double) ((my + 1) - 2.0 * marginy) / (my + 1.0); - for (q = 0; q < numFigs; q++) - for (w = 0; w < numPoints; w++) { - a[q][w].x = marginx + a[q][w].x * scalex; - a[q][w].y = marginy + a[q][w].y * scaley; + for (q = 0; q < st->numFigs; q++) + for (w = 0; w < st->numPoints; w++) { + st->a[q][w].x = marginx + st->a[q][w].x * scalex; + st->a[q][w].y = marginy + st->a[q][w].y * scaley; } #endif } static void -initLMorph(void) +initLMorph(struct state *st) { int steps; XGCValues gcv; XWindowAttributes wa; Colormap cmap; char *ft; - - numPoints = get_integer_resource("points", "Integer"); - steps = get_integer_resource("steps", "Integer"); - delay = get_integer_resource("delay", "Integer"); - ft = get_string_resource("figtype", "String"); + int i; + + st->maxGamma = 1.0; + st->numPoints = get_integer_resource(st->dpy, "points", "Integer"); + steps = get_integer_resource(st->dpy, "steps", "Integer"); + st->delay = get_integer_resource(st->dpy, "delay", "Integer"); + ft = get_string_resource(st->dpy, "figtype", "String"); if (strcmp(ft, "all") == 0) - figType = FT_ALL; + st->figType = FT_ALL; else if (strcmp(ft, "open") == 0) - figType = FT_OPEN; + st->figType = FT_OPEN; else if (strcmp(ft, "closed") == 0) - figType = FT_CLOSED; + st->figType = FT_CLOSED; else { fprintf(stderr, "figtype should be `all', `open' or `closed'.\n"); - figType = FT_ALL; + st->figType = FT_ALL; } if (steps <= 0) steps = (random() % 400) + 100; - deltaGamma = 1.0 / steps; - XGetWindowAttributes(dpy, window, &wa); - scrWidth = wa.width; - scrHeight = wa.height; + st->deltaGamma = 1.0 / steps; + XGetWindowAttributes(st->dpy, st->window, &wa); + st->scrWidth = wa.width; + st->scrHeight = wa.height; cmap = wa.colormap; - gcv.foreground = get_pixel_resource("foreground", "Foreground", dpy, cmap); - gcDraw = XCreateGC(dpy, window, GCForeground, &gcv); - XSetForeground(dpy, gcDraw, gcv.foreground); - gcv.foreground = get_pixel_resource("background", "Background", dpy, cmap); - gcClear = XCreateGC(dpy, window, GCForeground, &gcv); - XClearWindow(dpy, window); - - srandom(time(NULL)); - initPointArrays(); - aCurr = aWork[nWork = 0]; - aPrev = NULL; - currGamma = maxGamma + 1.0; /* force creation of new figure at startup */ - nTo = RND(numFigs); - - { /* jwz for version 2.11 */ - int width = random() % 10; - int style = LineSolid; - int cap = (width > 1 ? CapRound : CapButt); - int join = (width > 1 ? JoinRound : JoinBevel); - if (width == 1) width = 0; - XSetLineAttributes(dpy, gcDraw, width, style, cap, join); - XSetLineAttributes(dpy, gcClear, width, style, cap, join); + gcv.foreground = get_pixel_resource(st->dpy, cmap, "foreground", "Foreground"); + st->gcDraw = XCreateGC(st->dpy, st->window, GCForeground, &gcv); + XSetForeground(st->dpy, st->gcDraw, gcv.foreground); + gcv.foreground = get_pixel_resource(st->dpy, cmap, "background", "Background"); + st->gcClear = XCreateGC(st->dpy, st->window, GCForeground, &gcv); + XClearWindow(st->dpy, st->window); + + initPointArrays(st); + st->aCurr = st->aWork[st->nWork = 0]; + st->aPrev = NULL; + st->currGamma = st->maxGamma + 1.0; /* force creation of new figure at startup */ + st->nTo = RND(st->numFigs); + do { + st->nNext = RND(st->numFigs); + } while (st->nNext == st->nTo); + + st->aSlopeTo = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); + st->aSlopeFrom = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); + st->aNext = (XPoint *) xmalloc(st->numPoints * sizeof(XPoint)); + + for (i = 0; i < st->numPoints ; i++) { + st->aSlopeTo[i].x = 0.0; + st->aSlopeTo[i].y = 0.0; + } + + { /* jwz for version 2.11 */ + /* int width = random() % 10;*/ + int width = get_integer_resource(st->dpy, "linewidth", "Integer"); + int style = LineSolid; + int cap = (width > 1 ? CapRound : CapButt); + int join = (width > 1 ? JoinRound : JoinBevel); + if (width == 1) + width = 0; + XSetLineAttributes(st->dpy, st->gcDraw, width, style, cap, join); + XSetLineAttributes(st->dpy, st->gcClear, width, style, cap, join); } } /* 55% of execution time */ static void -createPoints(void) +createPoints(struct state *st) { - int q; - XPoint *pa = aCurr, *pa1 = aFrom, *pa2 = aTo; -#ifdef USE_FLOAT - float fg, f1g; -#else - long lg, l1g; -#endif + int q; + XPoint *pa = st->aCurr, *pa1 = st->aFrom, *pa2 = st->aTo; + XPoint *qa1 = st->aSlopeFrom, *qa2 = st->aSlopeTo; + float fg, f1g; + float speed; + + fg = st->currGamma; + f1g = 1.0 - st->currGamma; + for (q = st->numPoints; q; q--) { + speed = 0.45 * sin(TWO_PI * (double) (q + st->shift) / (st->numPoints - 1)); + fg = st->currGamma + 1.67 * speed + * exp(-200.0 * (st->currGamma - 0.5 + 0.7 * speed) + * (st->currGamma - 0.5 + 0.7 * speed)); + + f1g = 1.0 - fg; + pa->x = (short) (f1g * f1g * f1g * pa1->x + f1g * f1g * fg + * (3 * pa1->x + qa1->x) + f1g * fg * fg + * (3 * pa2->x - qa2->x) + fg * fg * fg * pa2->x); + pa->y = (short) (f1g * f1g * f1g * pa1->y + f1g * f1g * fg + * (3 * pa1->y + qa1->y) + f1g * fg * fg + * (3 * pa2->y - qa2->y) + fg * fg * fg * pa2->y); -#ifdef USE_FLOAT - fg = currGamma; - f1g = 1.0 - currGamma; -#else - lg = 8192L * currGamma; - l1g = 8192L * (1.0 - currGamma); -#endif - for (q = numPoints; q; q--) { -#ifdef USE_FLOAT - pa->x = (short) (f1g * pa1->x + fg * pa2->x); - pa->y = (short) (f1g * pa1->y + fg * pa2->y); -#else - pa->x = (short) ((l1g * pa1->x + lg * pa2->x) / 8192L); - pa->y = (short) ((l1g * pa1->y + lg * pa2->y) / 8192L); -#endif ++pa; ++pa1; ++pa2; + ++qa1; + ++qa2; } } /* 36% of execution time */ static void -drawImage(void) +drawImage(struct state *st) { - int q; +#if 0 + int q; XPoint *old0, *old1, *new0, *new1; /* Problem: update the window without too much flickering. I do * this by handling each linesegment separately. First remove a * line, then draw the new line. The problem is that this leaves - * small black pixels on the figure. To fix this, I draw the + * small black pixels on the figure. To fix this, we draw the * entire figure using XDrawLines() afterwards. */ - if (aPrev) { - old0 = aPrev; - old1 = aPrev + 1; - new0 = aCurr; - new1 = aCurr + 1; - for (q = numPoints - 1; q; q--) { - XDrawLine(dpy, window, gcClear, - old0->x, old0->y, old1->x, old1->y); - XDrawLine(dpy, window, gcDraw, + if (st->aPrev) { + old0 = st->aPrev; + old1 = st->aPrev + 1; + new0 = st->aCurr; + new1 = st->aCurr + 1; + for (q = st->numPoints - 1; q; q--) { + XDrawLine(st->dpy, st->window, st->gcClear, + old0->x, old0->y, old1->x, old1->y); + XDrawLine(st->dpy, st->window, st->gcDraw, new0->x, new0->y, new1->x, new1->y); ++old0; ++old1; @@ -442,72 +472,97 @@ drawImage(void) ++new1; } } - XDrawLines(dpy, window, gcDraw, aCurr, numPoints, CoordModeOrigin); - - XFlush(dpy); +#else + XClearWindow(st->dpy,st->window); +#endif + XDrawLines(st->dpy, st->window, st->gcDraw, st->aCurr, st->numPoints, CoordModeOrigin); } /* neglectible % of execution time */ static void -animateLMorph(void) +animateLMorph(struct state *st) { - if (currGamma > maxGamma) { - currGamma = 0.0; - if (maxGamma == 1.0) { - nFrom = nTo; - aFrom = a[nFrom]; - } else { - memcpy(aTmp, aCurr, numPoints * sizeof(XPoint)); - aFrom = aTmp; - nFrom = -1; - } + int i; + if (st->currGamma > st->maxGamma) { + st->currGamma = 0.0; + st->nFrom = st->nTo; + st->nTo = st->nNext; + st->aFrom = st->a[st->nFrom]; + st->aTo = st->a[st->nTo]; do { - nTo = RND(numFigs); - } while (nTo == nFrom); - aTo = a[nTo]; + st->nNext = RND(st->numFigs); + } while (st->nNext == st->nTo); + st->aNext = st->a[st->nNext]; + + st->shift = RND(st->numPoints); if (RND(2)) { /* reverse the array to get more variation. */ int i1, i2; XPoint p; - for (i1 = 0, i2 = numPoints - 1; i1 < numPoints / 2; i1++, i2--) { - p = aTo[i1]; - aTo[i1] = aTo[i2]; - aTo[i2] = p; + for (i1 = 0, i2 = st->numPoints - 1; i1 < st->numPoints / 2; i1++, i2--) { + p = st->aNext[i1]; + st->aNext[i1] = st->aNext[i2]; + st->aNext[i2] = p; } } - /* occationally interrupt the next run. */ - if (RND(4) == 0) - maxGamma = 0.1 + 0.7 * (RND(1001) / 1000.0); /* partial run */ - else - maxGamma = 1.0; /* full run */ + + /* calculate the slopes */ + for (i = 0; i < st->numPoints ; i++) { + st->aSlopeFrom[i].x = st->aSlopeTo[i].x; + st->aSlopeFrom[i].y = st->aSlopeTo[i].y; + st->aSlopeTo[i].x = st->aNext[i].x - st->aTo[i].x; + st->aSlopeTo[i].y = (st->aNext[i].y - st->aTo[i].y); + } } - createPoints(); - drawImage(); - aPrev = aCurr; - aCurr = aWork[nWork ^= 1]; + createPoints(st); + drawImage(st); + st->aPrev = st->aCurr; + st->aCurr = st->aWork[st->nWork ^= 1]; + + st->currGamma += st->deltaGamma; +} + +/*-----------------------------------------------------------------------+ +| PUBLIC FUNCTIONS | ++-----------------------------------------------------------------------*/ - currGamma += deltaGamma; +static void * +lmorph_init (Display *d, Window w) +{ + struct state *st = (struct state *) calloc (1, sizeof(*st)); + st->dpy = d; + st->window = w; + initLMorph(st); + return st; } +static unsigned long +lmorph_draw (Display *dpy, Window window, void *closure) +{ + struct state *st = (struct state *) closure; + animateLMorph(st); + return st->delay; +} +static void +lmorph_reshape (Display *dpy, Window window, void *closure, + unsigned int w, unsigned int h) +{ +} -/************************************************************************** - * * - * P U B L I C F U N C T I O N S * - * * - **************************************************************************/ +static Bool +lmorph_event (Display *dpy, Window window, void *closure, XEvent *event) +{ + return False; +} -void -screenhack(Display *disp, Window win) +static void +lmorph_free (Display *dpy, Window window, void *closure) { - dpy = disp; - window = win; - initLMorph(); - for (;;) { - animateLMorph(); - screenhack_handle_events (dpy); - usleep(delay); - } + struct state *st = (struct state *) closure; + free (st); } + +XSCREENSAVER_MODULE ("LMorph", lmorph)