+++ /dev/null
-/* -*- Mode: C; tab-width: 4 -*-
- * spiral --- low cpu screen design.
- */
-#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)spiral.c 4.00 97/01/01 xlockmore";
-#endif
-
-/* Copyright (c) 1994 Darrick Brown.
- *
- * 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.
- *
- * Idea based on a graphics demo I saw a *LONG* time ago.
- *
- * See xlock.c for copying information.
- *
- * Revision History:
- * 10-May-97: jwz@jwz.org: turned into a standalone program.
- * 24-Jul-95: Fix to allow cycles not to have an arbitrary value by
- * Peter Schmitzberger (schmitz@coma.sbg.ac.at).
- * 06-Mar-95: Finished cleaning up and final testing.
- * Copyright (c) 1994 by Darrick Brown.
- *
- * 03-Mar-95: Cleaned up code.
- * 12-Jul-94: Written.
- */
-
-#ifdef STANDALONE
-# define PROGCLASS "Spiral"
-# define HACK_INIT init_spiral
-# define HACK_DRAW draw_spiral
-# define spiral_opts xlockmore_opts
-# define DEFAULTS "*count: 40 \n" \
- "*cycles: 350 \n" \
- "*delay: 50000 \n" \
- "*ncolors: 64 \n"
-# define SMOOTH_COLORS
-# include "xlockmore.h" /* from the xscreensaver distribution */
-#else /* !STANDALONE */
-# include "xlock.h" /* from the xlockmore distribution */
-#endif /* !STANDALONE */
-
-ModeSpecOpt spiral_opts = {
- 0, NULL, 0, NULL, NULL };
-
-#define MAXTRAIL 512 /* The length of the trail */
-#define MAXDOTS 40
-#define MINDOTS 1
-#define TWOPI (2.0*M_PI) /* for convienence */
-#define JAGGINESS 4 /* This sets the "Craziness" of the spiral (I like 4) */
-#define SPEED 2.0
-
-/* How many segments to draw per cycle when redrawing */
-#define REDRAWSTEP 3
-
-typedef struct {
- float hx, hy, ha, hr;
-} Traildots;
-
-typedef struct {
- Traildots *traildots;
- float cx, cy;
- float angle;
- float radius;
- float dr, da;
- float dx, dy;
- int erase;
- int inc;
- float colors;
- int width, height;
- float top, bottom, left, right;
- int dots, nlength;
- int redrawing, redrawpos;
-} spiralstruct;
-
-static spiralstruct *spirals = NULL;
-
-static void draw_dots(ModeInfo * mi, int in);
-
-#define TFX(sp,x) ((int)((x/sp->right)*(float)sp->width))
-#define TFY(sp,y) ((int)((y/sp->top)*(float)sp->height))
-
-static void
-draw_dots(ModeInfo * mi, int in)
-{
-
- float i, inc;
- float x, y;
-
- spiralstruct *sp = &spirals[MI_SCREEN(mi)];
-
- inc = TWOPI / (float) sp->dots;
- for (i = 0.0; i < TWOPI; i += inc) {
- x = sp->traildots[in].hx + COSF(i + sp->traildots[in].ha) *
- sp->traildots[in].hr;
- y = sp->traildots[in].hy + SINF(i + sp->traildots[in].ha) *
- sp->traildots[in].hr;
- XDrawPoint(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
- TFX(sp, x), TFY(sp, y));
- }
-}
-
-void
-init_spiral(ModeInfo * mi)
-{
- spiralstruct *sp;
- int i;
-
- if (spirals == NULL) {
- if ((spirals = (spiralstruct *) calloc(MI_NUM_SCREENS(mi),
- sizeof (spiralstruct))) == NULL)
- return;
- }
- sp = &spirals[MI_SCREEN(mi)];
-
- sp->width = MI_WIN_WIDTH(mi);
- sp->height = MI_WIN_HEIGHT(mi);
-
- XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
-
- /* Init */
- sp->nlength = MI_CYCLES(mi);
-
- if (!sp->traildots)
- sp->traildots = (Traildots *) malloc(sp->nlength * sizeof (Traildots));
-
- /* initialize the allocated array */
- for (i = 0; i < sp->nlength; i++) {
- sp->traildots[i].hx = 0.0;
- sp->traildots[i].hy = 0.0;
- sp->traildots[i].ha = 0.0;
- sp->traildots[i].hr = 0.0;
- }
- sp->redrawing = 0;
-
- /* keep the window parameters proportional */
- sp->top = 10000.0;
- sp->bottom = 0;
- sp->right = (float) (sp->width) / (float) (sp->height) * (10000.0);
- sp->left = 0;
-
- /* assign the initial values */
- sp->cx = (float) (5000.0 - NRAND(2000)) / 10000.0 * sp->right;
- sp->cy = (float) (5000.0 - NRAND(2000));
- sp->radius = (float) (NRAND(200) + 200);
- sp->angle = 0.0;
- sp->dx = (float) (10 - NRAND(20)) * SPEED;
- sp->dy = (float) (10 - NRAND(20)) * SPEED;
- sp->dr = (float) ((NRAND(10) + 4) * (1 - (LRAND() & 1) * 2));
- sp->da = (float) NRAND(360) / 7200.0 + 0.01;
- if (MI_NPIXELS(mi) > 2)
- sp->colors = (float) NRAND(MI_NPIXELS(mi));
- sp->erase = 0;
- sp->inc = 0;
- sp->traildots[sp->inc].hx = sp->cx;
- sp->traildots[sp->inc].hy = sp->cy;
- sp->traildots[sp->inc].ha = sp->angle;
- sp->traildots[sp->inc].hr = sp->radius;
- sp->inc++;
-
- sp->dots = MI_BATCHCOUNT(mi);
- if (sp->dots < -MINDOTS)
- sp->dots = NRAND(sp->dots - MINDOTS + 1) + MINDOTS;
- /* Absolute minimum */
- if (sp->dots < MINDOTS)
- sp->dots = MINDOTS;
-}
-
-void
-draw_spiral(ModeInfo * mi)
-{
- Display *display = MI_DISPLAY(mi);
- GC gc = MI_GC(mi);
- spiralstruct *sp = &spirals[MI_SCREEN(mi)];
- int i, j;
-
- if (sp->erase == 1) {
- XSetForeground(display, gc, MI_WIN_BLACK_PIXEL(mi));
- draw_dots(mi, sp->inc);
- }
- sp->cx += sp->dx;
- sp->traildots[sp->inc].hx = sp->cx;
-
- if ((sp->cx > 9000.0) || (sp->cx < 1000.0))
- sp->dx *= -1.0;
-
- sp->cy += sp->dy;
- sp->traildots[sp->inc].hy = sp->cy;
-
- if ((sp->cy > 9000.0) || (sp->cy < 1000.0))
- sp->dy *= -1.0;
-
- sp->radius += sp->dr;
- sp->traildots[sp->inc].hr = sp->radius;
-
- if ((sp->radius > 2500.0) && (sp->dr > 0.0))
- sp->dr *= -1.0;
- else if ((sp->radius < 50.0) && (sp->radius < 0.0))
- sp->dr *= -1.0;
-
- /* Randomly give some variations to: */
-
- /* spiral direction (if it is within the boundaries) */
- if ((NRAND(3000) < 1 * JAGGINESS) &&
- (((sp->cx > 2000.0) && (sp->cx < 8000.0)) &&
- ((sp->cy > 2000.0) && (sp->cy < 8000.0)))) {
- sp->dx = (float) (10 - NRAND(20)) * SPEED;
- sp->dy = (float) (10 - NRAND(20)) * SPEED;
- }
- /* The speed of the change in size of the spiral */
- if (NRAND(3000) < 1 * JAGGINESS) {
- if (LRAND() & 1)
- sp->dr += (float) (NRAND(3) + 1);
- else
- sp->dr -= (float) (NRAND(3) + 1);
-
- /* don't let it get too wild */
- if (sp->dr > 18.0)
- sp->dr = 18.0;
- else if (sp->dr < 4.0)
- sp->dr = 4.0;
- }
- /* The speed of rotation */
- if (NRAND(3000) < 1 * JAGGINESS)
- sp->da = (float) NRAND(360) / 7200.0 + 0.01;
-
- /* Reverse rotation */
- if (NRAND(3000) < 1 * JAGGINESS)
- sp->da *= -1.0;
-
- sp->angle += sp->da;
- sp->traildots[sp->inc].ha = sp->angle;
-
- if (sp->angle > TWOPI)
- sp->angle -= TWOPI;
- else if (sp->angle < 0.0)
- sp->angle += TWOPI;
-
- sp->colors += (float) MI_NPIXELS(mi) / ((float) (2 * sp->nlength));
- if (sp->colors >= (float) MI_NPIXELS(mi))
- sp->colors = 0.0;
-
- if (MI_NPIXELS(mi) > 2)
- XSetForeground(display, gc, MI_PIXEL(mi, (int) sp->colors));
- else
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
- draw_dots(mi, sp->inc);
- sp->inc++;
-
- if (sp->inc > sp->nlength - 1) {
- sp->inc -= sp->nlength;
- sp->erase = 1;
- }
- if (sp->redrawing) {
- for (i = 0; i < REDRAWSTEP; i++) {
- j = (sp->inc - sp->redrawpos + sp->nlength) % sp->nlength;
- draw_dots(mi, j);
-
- if (++(sp->redrawpos) >= sp->nlength) {
- sp->redrawing = 0;
- break;
- }
- }
- }
-}
-
-void
-release_spiral(ModeInfo * mi)
-{
- if (spirals != NULL) {
- int screen;
-
- for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
- spiralstruct *sp = &spirals[screen];
-
- if (sp->traildots)
- (void) free((void *) sp->traildots);
- }
- (void) free((void *) spirals);
- spirals = NULL;
- }
-}
-
-void
-refresh_spiral(ModeInfo * mi)
-{
- spiralstruct *sp = &spirals[MI_SCREEN(mi)];
-
- sp->redrawing = 1;
- sp->redrawpos = 0;
-}
projects / xscreensaver / blobdiff