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Diffstat (limited to 'hacks/fadeplot.c')
| -rw-r--r-- | hacks/fadeplot.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/hacks/fadeplot.c b/hacks/fadeplot.c new file mode 100644 index 0000000..93f4719 --- /dev/null +++ b/hacks/fadeplot.c @@ -0,0 +1,233 @@ +/* -*- Mode: C; tab-width: 4 -*- */ +/* fadeplot --- a fading plot of sine squared */ + +#if 0 +static const char sccsid[] = "@(#)fadeplot.c 5.00 2000/11/01 xlockmore"; +#endif + +/*- + * Some easy plotting stuff, by Bas van Gaalen, Holland, PD + * + * Copyright (c) 1996 by Charles Vidal + * + * 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: + * 01-Nov-2000: Allocation checks + * 10-May-1997: Compatible with screensaver + * 1996: Written by Charles Vidal based on work by Bas van Gaalen + */ + +#ifdef STANDALONE +# define MODE_fadeplot +# define DEFAULTS "*delay: 30000 \n" \ + "*count: 10 \n" \ + "*cycles: 1500 \n" \ + "*ncolors: 64 \n" \ + "*fpsSolid: true \n" \ + "*ignoreRotation: True \n" \ + +# define BRIGHT_COLORS +# define UNIFORM_COLORS +# define release_fadeplot 0 +# define fadeplot_handle_event 0 +# include "xlockmore.h" /* in xscreensaver distribution */ +#else /* STANDALONE */ +# include "xlock.h" /* in xlockmore distribution */ +#endif /* STANDALONE */ + +#ifdef MODE_fadeplot + +ENTRYPOINT ModeSpecOpt fadeplot_opts = +{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL}; + +#ifdef USE_MODULES +ModStruct fadeplot_description = +{"fadeplot", "init_fadeplot", "draw_fadeplot", (char *) NULL, + "refresh_fadeplot", "init_fadeplot", "free_fadeplot", &fadeplot_opts, + 30000, 10, 1500, 1, 64, 0.6, "", + "Shows a fading plot of sine squared", 0, NULL}; + +#endif + +#define MINSTEPS 1 + +typedef struct { + XPoint speed, step, factor, st; + int temps, maxpts, nbstep; + int min; + int width, height; + int pix; + int angles; + int *stab; + XPoint *pts; +} fadeplotstruct; + +static fadeplotstruct *fadeplots = (fadeplotstruct *) NULL; + +ENTRYPOINT void +free_fadeplot(ModeInfo * mi) +{ + fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)]; + if (fp->pts != NULL) { + (void) free((void *) fp->pts); + fp->pts = (XPoint *) NULL; + } + if (fp->stab != NULL) { + (void) free((void *) fp->stab); + fp->stab = (int *) NULL; + } +} + +static Bool +initSintab(ModeInfo * mi) +{ + fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)]; + int i; + float x; + + fp->angles = NRAND(950) + 250; + if ((fp->stab = (int *) malloc(fp->angles * sizeof (int))) == NULL) { + free_fadeplot(mi); + return False; + } + for (i = 0; i < fp->angles; i++) { + x = SINF(2.0 * M_PI * i / fp->angles); + fp->stab[i] = (int) (x * ABS(x) * fp->min) + fp->min; + } + return True; +} + +ENTRYPOINT void +init_fadeplot (ModeInfo * mi) +{ + fadeplotstruct *fp; + + MI_INIT (mi, fadeplots); + fp = &fadeplots[MI_SCREEN(mi)]; + + fp->width = MI_WIDTH(mi); + fp->height = MI_HEIGHT(mi); + fp->min = MAX(MIN(fp->width, fp->height) / 2, 1); + + fp->speed.x = 8; + fp->speed.y = 10; + fp->step.x = 1; + fp->step.y = 1; + fp->temps = 0; + fp->factor.x = MAX(fp->width / (2 * fp->min), 1); + fp->factor.y = MAX(fp->height / (2 * fp->min), 1); + + fp->nbstep = MI_COUNT(mi); + if (fp->nbstep < -MINSTEPS) { + fp->nbstep = NRAND(-fp->nbstep - MINSTEPS + 1) + MINSTEPS; + } else if (fp->nbstep < MINSTEPS) + fp->nbstep = MINSTEPS; + + fp->maxpts = MI_CYCLES(mi); + if (fp->maxpts < 1) + fp->maxpts = 1; + + if (fp->pts == NULL) { + if ((fp->pts = (XPoint *) calloc(fp->maxpts, sizeof (XPoint))) == + NULL) { + free_fadeplot(mi); + return; + } + } + if (MI_NPIXELS(mi) > 2) + fp->pix = NRAND(MI_NPIXELS(mi)); + + if (fp->stab != NULL) + (void) free((void *) fp->stab); + if (!initSintab(mi)) + return; + MI_CLEARWINDOW(mi); +} + +ENTRYPOINT void +draw_fadeplot (ModeInfo * mi) +{ + Display *display = MI_DISPLAY(mi); + Window window = MI_WINDOW(mi); + GC gc = MI_GC(mi); + int i, j, temp; + fadeplotstruct *fp; + + if (fadeplots == NULL) + return; + fp = &fadeplots[MI_SCREEN(mi)]; + if (fp->stab == NULL) + return; + + MI_IS_DRAWN(mi) = True; + XSetForeground(display, gc, MI_BLACK_PIXEL(mi)); + XDrawPoints(display, window, gc, fp->pts, fp->maxpts, CoordModeOrigin); + + if (MI_NPIXELS(mi) > 2) { + XSetForeground(display, gc, MI_PIXEL(mi, fp->pix)); + if (++fp->pix >= MI_NPIXELS(mi)) + fp->pix = 0; + } else + XSetForeground(display, gc, MI_WHITE_PIXEL(mi)); + + temp = 0; + for (j = 0; j < fp->nbstep; j++) { + for (i = 0; i < fp->maxpts / fp->nbstep; i++) { + fp->pts[temp].x = + fp->stab[(fp->st.x + fp->speed.x * j + i * fp->step.x) % fp->angles] * + fp->factor.x + fp->width / 2 - fp->min; + fp->pts[temp].y = + fp->stab[(fp->st.y + fp->speed.y * j + i * fp->step.y) % fp->angles] * + fp->factor.y + fp->height / 2 - fp->min; + temp++; + } + } + XDrawPoints(display, window, gc, fp->pts, temp, CoordModeOrigin); + fp->st.x = (fp->st.x + fp->speed.x) % fp->angles; + fp->st.y = (fp->st.y + fp->speed.y) % fp->angles; + fp->temps++; + if ((fp->temps % (fp->angles / 2)) == 0) { + fp->temps = fp->temps % fp->angles * 5; + if ((fp->temps % (fp->angles)) == 0) + fp->speed.y = (fp->speed.y + 1) % 30 + 1; + if ((fp->temps % (fp->angles * 2)) == 0) + fp->speed.x = (fp->speed.x) % 20; + if ((fp->temps % (fp->angles * 3)) == 0) + fp->step.y = (fp->step.y + 1) % 2 + 1; + + MI_CLEARWINDOW(mi); + } +} + +ENTRYPOINT void +reshape_fadeplot(ModeInfo * mi, int width, int height) +{ + fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)]; + fp->width = width; + fp->height = height; + fp->min = MAX(MIN(fp->width, fp->height) / 2, 1); + fp->factor.x = MAX(fp->width / (2 * fp->min), 1); + fp->factor.y = MAX(fp->height / (2 * fp->min), 1); +} + +#ifndef STANDALONE +ENTRYPOINT void +refresh_fadeplot (ModeInfo * mi) +{ +} +#endif + +XSCREENSAVER_MODULE ("FadePlot", fadeplot) + +#endif /* MODE_fadeplot */ |