-
-/**************************************************************************
- *
- * 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 <stdio.h>
-#include <stdlib.h>
-#include <string.h>
#include <math.h>
#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))
#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)
}
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
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;
++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)
projects / xscreensaver / blobdiff