+++ /dev/null
-/* -*- Mode: C; tab-width: 4 -*-
- * laser --- draws swinging laser beams.
- */
-#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)laser.c 4.00 97/01/01 xlockmore";
-#endif
-
-/* Copyright (c) 1995 Pascal Pensa <pensa@aurora.unice.fr>
- *
- * 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.
- *
- * Revision History:
- * 10-May-97: jwz@jwz.org: turned into a standalone program.
- */
-
-#ifdef STANDALONE
-# define PROGCLASS "Laser"
-# define HACK_INIT init_laser
-# define HACK_DRAW draw_laser
-# define laser_opts xlockmore_opts
-# define DEFAULTS "*count: 10 \n" \
- "*cycles: 200 \n" \
- "*delay: 40000 \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 laser_opts = {
- 0, NULL, 0, NULL, NULL };
-
-#define MINREDRAW 3 /* Number of redrawn on each frame */
-#define MAXREDRAW 8
-
-#define MINLASER 1 /* Laser number */
-
-#define MINWIDTH 2 /* Laser ray width range */
-#define MAXWIDTH 40
-
-#define MINSPEED 2 /* Speed range */
-#define MAXSPEED 17
-
-#define MINDIST 10 /* Minimal distance from edges */
-
-#define COLORSTEP 2 /* Laser color step */
-
-#define RANGE_RAND(min,max) ((min) + LRAND() % ((max) - (min)))
-
-typedef enum {
- TOP, RIGHT, BOTTOM, LEFT
-} border;
-
-typedef struct {
- int bx; /* border x */
- int by; /* border y */
- border bn; /* active border */
- int dir; /* direction */
- int speed; /* laser velocity from MINSPEED to MAXSPEED */
- int sx[MAXWIDTH]; /* x stack */
- int sy[MAXWIDTH]; /* x stack */
- XGCValues gcv; /* for color */
-} laserstruct;
-
-typedef struct {
- int width;
- int height;
- int cx; /* center x */
- int cy; /* center y */
- int lw; /* laser width */
- int ln; /* laser number */
- int lr; /* laser redraw */
- int sw; /* stack width */
- int so; /* stack offset */
- int time; /* up time */
- GC stippledGC;
- XGCValues gcv_black; /* for black color */
- laserstruct *laser;
-} lasersstruct;
-
-static lasersstruct *lasers = NULL;
-
-
-void
-init_laser(ModeInfo * mi)
-{
- int i, c = 0;
- lasersstruct *lp;
-
- if (lasers == NULL) {
- if ((lasers = (lasersstruct *) calloc(MI_NUM_SCREENS(mi),
- sizeof (lasersstruct))) == NULL)
- return;
- }
- lp = &lasers[MI_SCREEN(mi)];
-
- lp->width = MI_WIN_WIDTH(mi);
- lp->height = MI_WIN_HEIGHT(mi);
- lp->time = 0;
-
- lp->ln = MI_BATCHCOUNT(mi);
- if (lp->ln < -MINLASER) {
- /* if lp->ln is random ... the size can change */
- if (lp->laser != NULL) {
- (void) free((void *) lp->laser);
- lp->laser = NULL;
- }
- lp->ln = NRAND(-lp->ln - MINLASER + 1) + MINLASER;
- } else if (lp->ln < MINLASER)
- lp->ln = MINLASER;
-
- if (!lp->laser) {
- lp->laser = (laserstruct *) malloc(lp->ln * sizeof (laserstruct));
- }
- if (lp->stippledGC == NULL) {
- XGCValues gcv;
-
- gcv.foreground = MI_WIN_WHITE_PIXEL(mi);
- gcv.background = MI_WIN_BLACK_PIXEL(mi);
- lp->gcv_black.foreground = MI_WIN_BLACK_PIXEL(mi);
- lp->stippledGC = XCreateGC(MI_DISPLAY(mi), MI_WINDOW(mi),
- GCForeground | GCBackground, &gcv);
- }
- XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
-
- if (MINDIST < lp->width - MINDIST)
- lp->cx = RANGE_RAND(MINDIST, lp->width - MINDIST);
- else
- lp->cx = RANGE_RAND(0, lp->width);
- if (MINDIST < lp->height - MINDIST)
- lp->cy = RANGE_RAND(MINDIST, lp->height - MINDIST);
- else
- lp->cy = RANGE_RAND(0, lp->height);
- lp->lw = RANGE_RAND(MINWIDTH, MAXWIDTH);
- lp->lr = RANGE_RAND(MINREDRAW, MAXREDRAW);
- lp->sw = 0;
- lp->so = 0;
-
- if (MI_NPIXELS(mi) > 2)
- c = NRAND(MI_NPIXELS(mi));
-
- for (i = 0; i < lp->ln; i++) {
- laserstruct *l = &lp->laser[i];
-
- l->bn = (border) NRAND(4);
-
- switch (l->bn) {
- case TOP:
- l->bx = NRAND(lp->width);
- l->by = 0;
- break;
- case RIGHT:
- l->bx = lp->width;
- l->by = NRAND(lp->height);
- break;
- case BOTTOM:
- l->bx = NRAND(lp->width);
- l->by = lp->height;
- break;
- case LEFT:
- l->bx = 0;
- l->by = NRAND(lp->height);
- }
-
- l->dir = LRAND() & 1;
- l->speed = ((RANGE_RAND(MINSPEED, MAXSPEED) * lp->width) / 1000) + 1;
- if (MI_NPIXELS(mi) > 2) {
- l->gcv.foreground = MI_PIXEL(mi, c);
- c = (c + COLORSTEP) % MI_NPIXELS(mi);
- } else
- l->gcv.foreground = MI_WIN_WHITE_PIXEL(mi);
- }
-}
-
-static void
-draw_laser_once(ModeInfo * mi)
-{
- Display *display = MI_DISPLAY(mi);
- lasersstruct *lp = &lasers[MI_SCREEN(mi)];
- int i;
-
- for (i = 0; i < lp->ln; i++) {
- laserstruct *l = &lp->laser[i];
-
- if (lp->sw >= lp->lw) {
- XChangeGC(display, lp->stippledGC, GCForeground, &(lp->gcv_black));
- XDrawLine(display, MI_WINDOW(mi), lp->stippledGC,
- lp->cx, lp->cy,
- l->sx[lp->so], l->sy[lp->so]);
- }
- if (l->dir) {
- switch (l->bn) {
- case TOP:
- l->bx -= l->speed;
- if (l->bx < 0) {
- l->by = -l->bx;
- l->bx = 0;
- l->bn = LEFT;
- }
- break;
- case RIGHT:
- l->by -= l->speed;
- if (l->by < 0) {
- l->bx = lp->width + l->by;
- l->by = 0;
- l->bn = TOP;
- }
- break;
- case BOTTOM:
- l->bx += l->speed;
- if (l->bx >= lp->width) {
- l->by = lp->height - l->bx % lp->width;
- l->bx = lp->width;
- l->bn = RIGHT;
- }
- break;
- case LEFT:
- l->by += l->speed;
- if (l->by >= lp->height) {
- l->bx = l->by % lp->height;
- l->by = lp->height;
- l->bn = BOTTOM;
- }
- }
- } else {
- switch (l->bn) {
- case TOP:
- l->bx += l->speed;
- if (l->bx >= lp->width) {
- l->by = l->bx % lp->width;
- l->bx = lp->width;
- l->bn = RIGHT;
- }
- break;
- case RIGHT:
- l->by += l->speed;
- if (l->by >= lp->height) {
- l->bx = lp->width - l->by % lp->height;
- l->by = lp->height;
- l->bn = BOTTOM;
- }
- break;
- case BOTTOM:
- l->bx -= l->speed;
- if (l->bx < 0) {
- l->by = lp->height + l->bx;
- l->bx = 0;
- l->bn = LEFT;
- }
- break;
- case LEFT:
- l->by -= l->speed;
- if (l->by < 0) {
- l->bx = -l->bx;
- l->by = 0;
- l->bn = TOP;
- }
- }
- }
-
- XChangeGC(display, lp->stippledGC, GCForeground, &l->gcv);
- XDrawLine(display, MI_WINDOW(mi), lp->stippledGC,
- lp->cx, lp->cy, l->bx, l->by);
-
- l->sx[lp->so] = l->bx;
- l->sy[lp->so] = l->by;
-
- }
-
- if (lp->sw < lp->lw)
- ++lp->sw;
-
- lp->so = (lp->so + 1) % lp->lw;
-}
-
-void
-draw_laser(ModeInfo * mi)
-{
- lasersstruct *lp = &lasers[MI_SCREEN(mi)];
- int i;
-
- for (i = 0; i < lp->lr; i++)
- draw_laser_once(mi);
-
- if (++lp->time > MI_CYCLES(mi))
- init_laser(mi);
-}
-
-void
-release_laser(ModeInfo * mi)
-{
- if (lasers != NULL) {
- int screen;
-
- for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
- lasersstruct *lp = &lasers[screen];
-
- if (lp->laser != NULL)
- (void) free((void *) lp->laser);
- if (lp->stippledGC != NULL)
- XFreeGC(MI_DISPLAY(mi), lp->stippledGC);
- }
- (void) free((void *) lasers);
- lasers = NULL;
- }
-}
-
-void
-refresh_laser(ModeInfo * mi)
-{
- /* Do nothing, it will refresh by itself */
-}
projects / xscreensaver / blobdiff