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xenocara/app/xlockmore/modes/swirl.c
matthieu 110b2a9207 Importing xlockmore 5.22
2006-11-26 11:07:42 +00:00

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/* -*- Mode: C; tab-width: 4 -*- */
/* swirl --- swirly patterns */
#if !defined( lint ) && !defined( SABER )
static const char sccsid[] = "@(#)swirl.c 5.09 2003/06/30 xlockmore";
#endif
/*-
* Copyright (c) 1994 M.Dobie <mrd@ecs.soton.ac.uk>
*
* 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-Jun-2003: Changed writeable mode to be more consistent with
* xscreensaver's starfish, looks like I am not going to
* port the variable speed colormapping when done drawing.
* 01-Nov-2000: Allocation checks
* 13-May-1997: jwz@jwz.org: turned into a standalone program.
* 21-Apr-1995: improved startup time for TrueColour displays
* (limited to 16bpp to save memory) S.Early <sde1000@cam.ac.uk>
* 09-Jan-1995: fixed colour maps (more colourful) and the image now spirals
* outwards from the centre with a fixed number of points drawn
* every iteration. Thanks to M.Dobie <mrd@ecs.soton.ac.uk>.
* 1994: written. Copyright (c) 1994 M.Dobie <mrd@ecs.soton.ac.uk>
* based on original code by R.Taylor
*/
#ifdef STANDALONE
#define MODE_swirl
#define PROGCLASS "Swirl"
#define HACK_INIT init_swirl
#define HACK_DRAW draw_swirl
#define swirl_opts xlockmore_opts
#define DEFAULTS "*delay: 5000 \n" \
"*count: 5 \n" \
"*ncolors: 200 \n"
#define SMOOTH_COLORS
#define WRITABLE_COLORS
#include "xlockmore.h" /* from the xscreensaver distribution */
#else /* !STANDALONE */
#include "xlock.h" /* from the xlockmore distribution */
#include "color.h"
#endif /* !STANDALONE */
#ifdef MODE_swirl
#define DEF_CYCLE "True"
static Bool cycle_p;
static XrmOptionDescRec opts[] =
{
{(char *) "-cycle", (char *) ".swirl.cycle", XrmoptionNoArg, (caddr_t) "on"},
{(char *) "+cycle", (char *) ".swirl.cycle", XrmoptionNoArg, (caddr_t) "off"}
};
static argtype vars[] =
{
{(void *) & cycle_p, (char *) "cycle", (char *) "Cycle", (char *) DEF_CYCLE, t_Bool}
};
static OptionStruct desc[] =
{
{(char *) "-/+cycle", (char *) "turn on/off colour cycling"}
};
ModeSpecOpt swirl_opts =
{sizeof opts / sizeof opts[0], opts, sizeof vars / sizeof vars[0], vars, desc};
#ifdef USE_MODULES
ModStruct swirl_description =
{"swirl", "init_swirl", "draw_swirl", "release_swirl",
"refresh_swirl", "init_swirl", (char *) NULL, &swirl_opts,
5000, 5, 1, 1, 64, 1.0, "",
"Shows animated swirling patterns", 0, NULL};
#endif
#include <time.h>
#define MASS 4 /* maximum mass of a knot */
#define MIN_RES 5 /* minimim resolution (>= MIN_RES) */
#define MAX_RES 1 /* maximum resolution (>0) */
#define TWO_PLANE_PCNT 30 /* probability for two plane mode (0-100) */
#define RESTART 2500 /* number of cycles before restart */
#define BATCH_DRAW 100 /* points to draw per iteration */
/* knot types */
typedef enum {
NONE = 0,
ORBIT = (1 << 0),
WHEEL = (1 << 1),
PICASSO = (1 << 2),
RAY = (1 << 3),
HOOK = (1 << 4),
ALL = (1 << 5)
} KNOT_T;
/* a knot */
typedef struct Knot {
int x, y; /* position */
int m; /* mass */
KNOT_T t; /* type in the first (or only) plane */
KNOT_T T; /* type in second plane if there is one */
int M; /* mass in second plane if there is one */
} KNOT , *KNOT_P;
/* drawing direction */
typedef enum {
DRAW_RIGHT, DRAW_DOWN, DRAW_LEFT, DRAW_UP
} DIR_T;
/****************************************************************/
/* data associated with a swirl window */
typedef struct swirl_data {
/* window paramaters */
int width, height; /* window size */
int depth; /* depth */
int rdepth; /* real depth (for XImage) */
Visual *visual; /* visual */
/* swirl drawing parameters */
int n_knots; /* number of knots */
KNOT_P knots; /* knot details */
KNOT_T knot_type; /* general type of knots */
int resolution; /* drawing resolution, 1..5 */
int max_resolution; /* maximum resolution, MAX_RES */
int r; /* pixel step */
Bool two_plane; /* two plane mode? */
Bool first_plane; /* doing first plane? */
int start_again; /* when to restart */
/* spiral drawing parameters */
int x, y; /* current point */
DIR_T dir; /* current direction */
int dir_todo, dir_done; /* how many points in current direction? */
int batch_todo, batch_done; /* how many points in this batch */
Bool started, drawing; /* are we drawing? */
Bool off_screen;
/* image stuff */
XImage *ximage;
/* colours stuff */
int shift; /* colourmap shift */
int dshift; /* colourmap shift while drawing */
unsigned int cur_color;
GC gc;
Colormap cmap;
unsigned long blackpixel, whitepixel, fg, bg;
int direction;
XColor *colors;
int ncolors;
Bool cycle_p, mono_p, no_colors, reverse;
ModeInfo *mi;
} swirlstruct;
/* an array of swirls for each screen */
static swirlstruct *swirls = (swirlstruct *) NULL;
/*-
random_no
Return a random integer between 0 and n inclusive
- n is the maximum number
Returns a random integer */
static int
random_no(unsigned int n)
{
return ((int) ((n + 1) * (double) LRAND() / MAXRAND));
}
/****************************************************************/
static void
free_swirl(Display *display, swirlstruct *sp)
{
ModeInfo *mi = sp->mi;
if (MI_IS_INSTALL(mi) && MI_NPIXELS(mi) > 2) {
MI_WHITE_PIXEL(mi) = sp->whitepixel;
MI_BLACK_PIXEL(mi) = sp->blackpixel;
#ifndef STANDALONE
MI_FG_PIXEL(mi) = sp->fg;
MI_BG_PIXEL(mi) = sp->bg;
#endif
if (sp->colors != NULL) {
if (sp->ncolors && !sp->no_colors)
free_colors(display, sp->cmap, sp->colors,
sp->ncolors);
free(sp->colors);
sp->colors = (XColor *) NULL;
}
if (sp->cmap != None) {
XFreeColormap(display, sp->cmap);
sp->cmap = None;
}
}
if (sp->gc != None) {
XFreeGC(display, sp->gc);
sp->gc = None;
}
if (sp->ximage != None) {
(void) XDestroyImage(sp->ximage);
sp->ximage = None;
}
if (sp->knots != NULL) {
free(sp->knots);
sp->knots = (KNOT_P) NULL;
}
}
#ifndef STANDALONE
extern char *background;
extern char *foreground;
#endif
/*-
initialise_swirl
Initialise all the swirl data
- swirl is the swirl data */
static void
initialise_swirl(swirlstruct *sp)
{
sp->width = 0; /* width and height of window */
sp->height = 0;
sp->depth = 1;
sp->rdepth = 1;
sp->visual = (Visual *) NULL;
sp->resolution = MIN_RES + 1; /* current resolution */
sp->max_resolution = MAX_RES; /* maximum resolution */
sp->n_knots = 0; /* number of knots */
sp->knot_type = ALL; /* general type of knots */
sp->two_plane = False; /* two plane mode? */
sp->first_plane = False; /* doing first plane? */
sp->start_again = -1; /* restart counter */
/* drawing parameters */
sp->x = 0;
sp->y = 0;
sp->started = False;
sp->drawing = False;
/* image stuff */
sp->ximage = None;
}
/****************************************************************/
/*-
* initialise_image
*
* Initialise the image for drawing to
*
* - swirl is the swirl data
*/
static Bool
initialise_image(Display * dpy, swirlstruct *sp)
{
unsigned int pad;
int bytes_per_line;
int image_depth = sp->rdepth;
int data_depth = image_depth;
unsigned char *image; /* image data */
/* On SGIs at least, using an XImage of depth 24 on a Visual of depth 24
* requires the XImage data to use 32 bits per pixel. I don't understand
* how one is supposed to determine this -- maybe XListPixmapFormats?
* But on systems that don't work this way, allocating 32 bpp instead of
* 24 will be wasteful but non-fatal. -- jwz, 16-May-97.
*/
if (data_depth >= 24 && data_depth < 32)
data_depth = 32;
/* get the bitmap pad */
pad = BitmapPad(dpy);
/* destroy the old image (destroy XImage and data) */
if (sp->ximage != NULL)
(void) XDestroyImage(sp->ximage);
/* how many bytes per line? (bits rounded up to pad) */
bytes_per_line = ((sp->width * data_depth + pad - 1) / pad) * (pad / 8);
/* allocate space for the image */
if ((image = (unsigned char *) calloc(bytes_per_line *
sp->height, 1)) == NULL) {
return False;
}
/* create an ximage with this */
if ((sp->ximage = XCreateImage(dpy, sp->visual, image_depth, ZPixmap,
0, (char *) image, sp->width,
sp->height, pad, bytes_per_line)) == None) {
free(image);
return False;
}
return True;
}
/*-
* create_knots
*
* Initialise the array of knot
*
* swirl is the swirl data
*/
static Bool
create_knots(swirlstruct *sp)
{
int k;
Bool orbit, wheel, picasso, ray, hook;
KNOT_P knot;
/* create array for knots */
if (sp->knots)
free(sp->knots);
if ((sp->knots = (KNOT_P) calloc(sp->n_knots,
sizeof (KNOT))) == NULL) {
return False;
}
/* no knots yet */
orbit = wheel = picasso = ray = hook = False;
/* what types do we have? */
if ((int) sp->knot_type & (int) ALL) {
orbit = wheel = ray = hook = True;
} else {
if ((int) sp->knot_type & (int) ORBIT)
orbit = True;
if ((int) sp->knot_type & (int) WHEEL)
wheel = True;
if ((int) sp->knot_type & (int) PICASSO)
picasso = True;
if ((int) sp->knot_type & (int) RAY)
ray = True;
if ((int) sp->knot_type & (int) HOOK)
hook = True;
}
/* initialise each knot */
knot = sp->knots;
for (k = 0; k < sp->n_knots; k++) {
/* position */
knot->x = random_no((unsigned int) sp->width);
knot->y = random_no((unsigned int) sp->height);
/* mass */
knot->m = random_no(MASS) + 1;
/* can be negative */
if (random_no(100) > 50)
knot->m *= -1;
/* type */
knot->t = NONE;
while (knot->t == NONE) {
/* choose a random one from the types available */
switch (random_no(4)) {
case 0:
if (orbit)
knot->t = ORBIT;
break;
case 1:
if (wheel)
knot->t = WHEEL;
break;
case 2:
if (picasso)
knot->t = PICASSO;
break;
case 3:
if (ray)
knot->t = RAY;
break;
case 4:
if (hook)
knot->t = HOOK;
break;
}
}
/* if two planes, do same for second plane */
if (sp->two_plane) {
knot->T = NONE;
while (knot->T == NONE || knot->T == knot->t) {
/* choose a different type */
switch (random_no(4)) {
case 0:
if (orbit)
knot->T = ORBIT;
break;
case 1:
if (wheel)
knot->T = WHEEL;
break;
case 2:
if (picasso)
knot->T = PICASSO;
break;
case 3:
if (ray)
knot->T = RAY;
break;
case 4:
if (hook)
knot->T = HOOK;
break;
}
}
}
/* next knot */
knot++;
}
return True;
}
/****************************************************************/
/*-
* do_point
*
* Work out the pixel value at i, j. Ensure it does not clash with BlackPixel
* or WhitePixel.
*
* - swirl is the swirl data
* - i, j is the point to calculate
*
* Returns the value of the point
*/
static unsigned long
do_point(swirlstruct *sp, int i, int j)
{
int tT, k, add, value;
unsigned long colour_value;
double dx, dy, theta, dist;
int ncolours, qcolours;
double rads;
KNOT_P knot;
ModeInfo *mi = sp->mi;
/* how many colours? */
ncolours = sp->ncolors;
qcolours = ncolours / 4;
/* colour step round a circle */
rads = (double) ncolours / (2.0 * M_PI);
/* start at zero */
value = 0;
/* go through all the knots */
knot = sp->knots;
for (k = 0; k < sp->n_knots; k++) {
dx = i - knot->x;
dy = j - knot->y;
/* in two_plane mode get the appropriate knot type */
if (sp->two_plane)
tT = (int) ((sp->first_plane) ? knot->t : knot->T);
else
tT = (int) knot->t;
/* distance from knot */
dist = sqrt(dx * dx + dy * dy);
/* nothing to add at first */
add = 0;
/* work out the contribution (if close enough) */
if (dist > 0.1)
switch (tT) {
case ORBIT:
add = (int) (ncolours / (1.0 + 0.01 * abs(knot->m) * dist));
break;
case WHEEL:
/* Avoid atan2: DOMAIN error message */
if (dy == 0.0 && dx == 0.0)
theta = 1.0;
else
theta = (atan2(dy, dx) + M_PI) / M_PI;
if (theta < 1.0)
add = (int) (ncolours * theta +
sin(0.1 * knot->m * dist) *
qcolours * exp(-0.01 * dist));
else
add = (int) (ncolours * (theta - 1.0) +
sin(0.1 * knot->m * dist) *
qcolours * exp(-0.01 * dist));
break;
case PICASSO:
add = (int) (ncolours *
fabs(cos(0.002 * knot->m * dist)));
break;
case RAY:
/* Avoid atan2: DOMAIN error message */
if (dy == 0.0 && dx == 0.0)
add = 0;
else
add = (int) (ncolours * fabs(sin(2.0 * atan2(dy, dx))));
break;
case HOOK:
/* Avoid atan2: DOMAIN error message */
if (dy == 0.0 && dx == 0.0)
add = (int) (0.05 * (abs(knot->m) - 1) * dist);
else
add = (int) (rads * atan2(dy, dx) +
0.05 * (abs(knot->m) - 1) * dist);
break;
}
/* for a positive mass add on the contribution else take it off */
if (knot->m > 0)
value += add;
else
value -= add;
/* next knot */
knot++;
}
/* toggle plane */
sp->first_plane = (!sp->first_plane);
if (MI_IS_INSTALL(mi) && MI_NPIXELS(mi) > 2) {
if (ncolours < 2) {
ncolours = 2;
}
/* make sure we handle negative values properly */
if (value >= 0)
colour_value = (value % ncolours) + 2;
else
colour_value = ncolours - (abs((int) value) % (ncolours - 1));
/* definitely make sure it is in range */
colour_value = colour_value % ncolours;
if (sp->mono_p) {
return colour_value;
} else {
return sp->colors[colour_value].pixel;
}
} else {
if (value >= 0)
colour_value = (value % MI_NPIXELS(mi)) + 2;
else
colour_value = MI_NPIXELS(mi) - (abs((int) value) % (MI_NPIXELS(mi) - 1));
/* definitely make sure it is in range */
colour_value = colour_value % MI_NPIXELS(mi);
if (MI_NPIXELS(mi) > 2) {
return MI_PIXEL(mi, colour_value);
} else if (colour_value % 2)
return MI_BLACK_PIXEL(mi);
else
return MI_WHITE_PIXEL(mi);
}
}
/****************************************************************/
/*-
* draw_block
*
* Draw a square block of points with the same value.
*
* - ximage is the XImage to draw on.
* - x, y is the top left corner
* - s is the length of each side
* - v is the value
*/
static void
draw_block(XImage * ximage, int x, int y, int s, unsigned long v)
{
int a, b;
for (a = 0; a < s; a++)
for (b = 0; b < s; b++) {
XPutPixel(ximage, x + b, y + a, v);
}
}
/****************************************************************/
/*-
* draw_point Draw the current point in a swirl pattern onto the XImage
*
* - swirl is the swirl
* - win is the window to update
*/
static void
draw_point(ModeInfo * mi, swirlstruct *sp)
{
int r;
int x, y;
/* get current point coordinates and resolution */
x = sp->x;
y = sp->y;
r = sp->r;
/* check we are within the window */
if ((x < 0) || (x > sp->width - r) || (y < 0) || (y > sp->height - r))
return;
/* what style are we drawing? */
if (sp->two_plane) {
int r2;
/* halve the block size */
r2 = r / 2;
/* interleave blocks at half r */
draw_block(sp->ximage, x, y, r2, do_point(sp, x, y));
draw_block(sp->ximage, x + r2, y, r2, do_point(sp, x + r2, y));
draw_block(sp->ximage, x + r2, y + r2, r2, do_point(sp,
x + r2, y + r2));
draw_block(sp->ximage, x, y + r2, r2, do_point(sp, x, y + r2));
} else
draw_block(sp->ximage, x, y, r, do_point(sp, x, y));
/* update the screen */
/*-
* PURIFY 4.0.1 on SunOS4 and on Solaris 2 reports a 256 byte memory leak on
* the next line. */
(void) XPutImage(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi), sp->ximage,
x, y, x, y, r, r);
}
/****************************************************************/
/*-
* next_point Move to the next point in the spiral pattern
* - swirl is the swirl
* - win is the window to update
*/
static void
next_point(swirlstruct *sp)
{
/* more to do in this direction? */
if (sp->dir_done < sp->dir_todo) {
/* move in the current direction */
switch (sp->dir) {
case DRAW_RIGHT:
sp->x += sp->r;
break;
case DRAW_DOWN:
sp->y += sp->r;
break;
case DRAW_LEFT:
sp->x -= sp->r;
break;
case DRAW_UP:
sp->y -= sp->r;
break;
}
/* done another point */
sp->dir_done++;
} else {
/* none drawn yet */
sp->dir_done = 0;
/* change direction - check and record if off screen */
switch (sp->dir) {
case DRAW_RIGHT:
sp->dir = DRAW_DOWN;
if (sp->x > sp->width - sp->r) {
/* skip these points */
sp->dir_done = sp->dir_todo;
sp->y += (sp->dir_todo * sp->r);
/* check for finish */
if (sp->off_screen)
sp->drawing = False;
sp->off_screen = True;
} else
sp->off_screen = False;
break;
case DRAW_DOWN:
sp->dir = DRAW_LEFT;
sp->dir_todo++;
if (sp->y > sp->height - sp->r) {
/* skip these points */
sp->dir_done = sp->dir_todo;
sp->x -= (sp->dir_todo * sp->r);
/* check for finish */
if (sp->off_screen)
sp->drawing = False;
sp->off_screen = True;
} else
sp->off_screen = False;
break;
case DRAW_LEFT:
sp->dir = DRAW_UP;
if (sp->x < 0) {
/* skip these points */
sp->dir_done = sp->dir_todo;
sp->y -= (sp->dir_todo * sp->r);
/* check for finish */
if (sp->off_screen)
sp->drawing = False;
sp->off_screen = True;
} else
sp->off_screen = False;
break;
case DRAW_UP:
sp->dir = DRAW_RIGHT;
sp->dir_todo++;
if (sp->y < 0) {
/* skip these points */
sp->dir_done = sp->dir_todo;
sp->x += (sp->dir_todo * sp->r);
/* check for finish */
if (sp->off_screen)
sp->drawing = False;
sp->off_screen = True;
} else
sp->off_screen = False;
break;
}
}
}
/****************************************************************/
/*-
* init_swirl
*
* Initialise things for swirling
*
* - win is the window to draw in
*/
void
init_swirl(ModeInfo * mi)
{
Display *display = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
swirlstruct *sp;
/* does the swirls array exist? */
if (swirls == NULL) {
int i;
/* allocate an array, one entry for each screen */
if ((swirls = (swirlstruct *) calloc(MI_NUM_SCREENS(mi),
sizeof (swirlstruct))) == NULL)
return;
/* initialise them all */
for (i = 0; i < MI_NUM_SCREENS(mi); i++)
initialise_swirl(&swirls[i]);
}
/* get a pointer to this swirl */
sp = &(swirls[MI_SCREEN(mi)]);
sp->mi = mi;
/* get window parameters */
sp->width = MI_WIDTH(mi);
sp->height = MI_HEIGHT(mi);
sp->depth = MI_DEPTH(mi);
sp->rdepth = sp->depth;
sp->visual = MI_VISUAL(mi);
if (sp->depth > 16)
sp->depth = 16;
/* initialise image for speeding up drawing */
if (!initialise_image(display, sp)) {
free_swirl(display, sp);
return;
}
MI_CLEARWINDOW(mi);
if (!sp->gc) {
if (MI_IS_INSTALL(mi) && MI_NPIXELS(mi) > 2) {
XColor color;
#ifndef STANDALONE
sp->fg = MI_FG_PIXEL(mi);
sp->bg = MI_BG_PIXEL(mi);
#endif
sp->blackpixel = MI_BLACK_PIXEL(mi);
sp->whitepixel = MI_WHITE_PIXEL(mi);
if ((sp->cmap = XCreateColormap(display, window,
MI_VISUAL(mi), AllocNone)) == None) {
free_swirl(display, sp);
return;
}
XSetWindowColormap(display, window, sp->cmap);
(void) XParseColor(display, sp->cmap, "black", &color);
(void) XAllocColor(display, sp->cmap, &color);
MI_BLACK_PIXEL(mi) = color.pixel;
(void) XParseColor(display, sp->cmap, "white", &color);
(void) XAllocColor(display, sp->cmap, &color);
MI_WHITE_PIXEL(mi) = color.pixel;
#ifndef STANDALONE
(void) XParseColor(display, sp->cmap, background, &color);
(void) XAllocColor(display, sp->cmap, &color);
MI_BG_PIXEL(mi) = color.pixel;
(void) XParseColor(display, sp->cmap, foreground, &color);
(void) XAllocColor(display, sp->cmap, &color);
MI_FG_PIXEL(mi) = color.pixel;
#endif
sp->colors = (XColor *) NULL;
sp->ncolors = 0;
}
if ((sp->gc = XCreateGC(display, MI_WINDOW(mi),
(unsigned long) 0, (XGCValues *) NULL)) == None) {
free_swirl(display, sp);
return;
}
}
MI_CLEARWINDOW(mi);
/* Set up colour map */
sp->direction = (LRAND() & 1) ? 1 : -1;
if (MI_IS_INSTALL(mi) && MI_NPIXELS(mi) > 2) {
if (sp->colors != NULL) {
if (sp->ncolors && !sp->no_colors)
free_colors(display, sp->cmap, sp->colors, sp->ncolors);
free(sp->colors);
sp->colors = (XColor *) NULL;
}
sp->ncolors = MI_NCOLORS(mi);
if (sp->ncolors < 2)
sp->ncolors = 2;
if (sp->ncolors <= 2)
sp->mono_p = True;
else
sp->mono_p = False;
if (sp->mono_p)
sp->colors = (XColor *) NULL;
else
if ((sp->colors = (XColor *) malloc(sizeof (*sp->colors) *
(sp->ncolors + 1))) == NULL) {
free_swirl(display, sp);
return;
}
sp->cycle_p = has_writable_cells(mi);
if (sp->cycle_p) {
if (MI_IS_FULLRANDOM(mi)) {
if (!NRAND(8))
sp->cycle_p = False;
else
sp->cycle_p = True;
} else {
sp->cycle_p = cycle_p;
}
}
if (!sp->mono_p) {
if (!(LRAND() % 10))
make_random_colormap(
#if STANDALONE
display, MI_WINDOW(mi),
#else
mi,
#endif
sp->cmap, sp->colors, &sp->ncolors,
True, True, &sp->cycle_p);
else if (!(LRAND() % 2))
make_uniform_colormap(
#if STANDALONE
display, MI_WINDOW(mi),
#else
mi,
#endif
sp->cmap, sp->colors, &sp->ncolors,
True, &sp->cycle_p);
else
make_smooth_colormap(
#if STANDALONE
display, MI_WINDOW(mi),
#else
mi,
#endif
sp->cmap, sp->colors, &sp->ncolors,
True, &sp->cycle_p);
}
XInstallColormap(display, sp->cmap);
if (sp->ncolors < 2) {
sp->ncolors = 2;
sp->no_colors = True;
} else
sp->no_colors = False;
if (sp->ncolors <= 2)
sp->mono_p = True;
if (sp->mono_p)
sp->cycle_p = False;
}
if (MI_IS_INSTALL(mi) && MI_NPIXELS(mi) > 2) {
if (sp->mono_p) {
sp->cur_color = MI_BLACK_PIXEL(mi);
}
}
/* resolution starts off chunky */
sp->resolution = MIN_RES + 1;
/* calculate the pixel step for this resulution */
sp->r = (1 << (sp->resolution - 1));
/* how many knots? */
sp->n_knots = random_no((unsigned int) MI_COUNT(mi) / 2) +
MI_COUNT(mi) + 1;
/* what type of knots? */
sp->knot_type = ALL; /* for now */
/* use two_plane mode occaisionally */
if (random_no(100) <= TWO_PLANE_PCNT) {
sp->two_plane = sp->first_plane = True;
sp->max_resolution = 2;
} else
sp->two_plane = False;
/* fix the knot values */
if (!create_knots(sp)) {
free_swirl(display, sp);
return;
}
/* we are off */
sp->started = True;
sp->drawing = False;
}
/****************************************************************/
/*-
* draw_swirl
*
* Draw one iteration of swirling
*
* - win is the window to draw in
*/
void
draw_swirl(ModeInfo * mi)
{
swirlstruct *sp;
if (swirls == NULL)
return;
sp = &(swirls[MI_SCREEN(mi)]);
if (sp->knots == NULL)
return;
MI_IS_DRAWN(mi) = True;
/* are we going? */
if (sp->started) {
/* in the middle of drawing? */
if (sp->drawing) {
if(sp->cycle_p) {
rotate_colors(MI_DISPLAY(mi), sp->cmap, sp->colors, sp->ncolors, sp->direction);
if (!(LRAND() % 1000))
sp->direction = -sp->direction;
}
/* draw a batch of points */
sp->batch_todo = BATCH_DRAW;
while ((sp->batch_todo > 0) && sp->drawing) {
/* draw a point */
draw_point(mi, sp);
/* move to the next point */
next_point(sp);
/* done a point */
sp->batch_todo--;
}
} else {
if(sp->cycle_p) {
rotate_colors(MI_DISPLAY(mi), sp->cmap, sp->colors, sp->ncolors, sp->direction);
if (!(LRAND() % 1000))
sp->direction = -sp->direction;
}
/* time for a higher resolution? */
if (sp->resolution > sp->max_resolution) {
/* move to higher resolution */
sp->resolution--;
/* calculate the pixel step for this resulution */
sp->r = (1 << (sp->resolution - 1));
/* start drawing again */
sp->drawing = True;
/* start in the middle of the screen */
sp->x = (sp->width - sp->r) / 2;
sp->y = (sp->height - sp->r) / 2;
/* initialise spiral drawing parameters */
sp->dir = DRAW_RIGHT;
sp->dir_todo = 1;
sp->dir_done = 0;
} else {
/* all done, decide when to restart */
if (sp->start_again == -1) {
/* start the counter */
sp->start_again = RESTART;
} else if (sp->start_again == 0) {
/* reset the counter */
sp->start_again = -1;
/* start again */
init_swirl(mi);
} else
/* decrement the counter */
sp->start_again--;
}
}
}
}
/****************************************************************/
void
release_swirl(ModeInfo * mi)
{
/* does the swirls array exist? */
if (swirls != NULL) {
int screen;
/* free them all */
for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++)
free_swirl(MI_DISPLAY(mi), &swirls[screen]);
/* deallocate an array, one entry for each screen */
free(swirls);
swirls = (swirlstruct *) NULL;
}
}
/****************************************************************/
void
refresh_swirl(ModeInfo * mi)
{
swirlstruct *sp;
if (swirls == NULL)
return;
sp = &swirls[MI_SCREEN(mi)];
if (sp->started) {
MI_CLEARWINDOW(mi);
if (sp->drawing)
sp->resolution = sp->resolution + 1;
sp->drawing = False;
}
}
#endif /* MODE_swirl */
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