1 /* erase.c: Erase the screen in various more or less interesting ways.
2 * (c) 1997 by Johannes Keukelaar <johannes@nada.kth.se>
3 * Permission to use in any way granted. Provided "as is" without expressed
4 * or implied warranty. NO WARRANTY, NO EXPRESSION OF SUITABILITY FOR ANY
5 * PURPOSE. (I.e.: Use in any way, but at your own risk!)
11 #include "resources.h"
14 #define countof(x) (sizeof(x)/sizeof(*(x)))
16 typedef void (*Eraser) (Display *dpy, Window window, GC gc,
17 int width, int height, int delay, int granularity);
21 random_lines (Display *dpy, Window window, GC gc,
22 int width, int height, int delay, int granularity)
24 Bool horiz_p = (random() & 1);
25 int max = (horiz_p ? height : width);
26 int *lines = (int *) calloc(max, sizeof(*lines));
29 for (i = 0; i < max; i++)
32 for (i = 0; i < max; i++)
41 for (i = 0; i < max; i++)
44 XDrawLine (dpy, window, gc, 0, lines[i], width, lines[i]);
46 XDrawLine (dpy, window, gc, lines[i], 0, lines[i], height);
49 if (delay > 0 && ((i % granularity) == 0))
50 usleep (delay * granularity);
57 venetian (Display *dpy, Window window, GC gc,
58 int width, int height, int delay, int granularity)
60 Bool horiz_p = (random() & 1);
61 Bool flip_p = (random() & 1);
62 int max = (horiz_p ? height : width);
63 int *lines = (int *) calloc(max, sizeof(*lines));
69 for (i = 0; i < max*2; i++)
71 int line = ((i / 16) * 16) - ((i % 16) * 15);
72 if (line >= 0 && line < max)
73 lines[j++] = (flip_p ? max - line : line);
76 for (i = 0; i < max; i++)
79 XDrawLine (dpy, window, gc, 0, lines[i], width, lines[i]);
81 XDrawLine (dpy, window, gc, lines[i], 0, lines[i], height);
84 if (delay > 0 && ((i % granularity) == 0))
85 usleep (delay * granularity);
92 triple_wipe (Display *dpy, Window window, GC gc,
93 int width, int height, int delay, int granularity)
95 Bool flip_x = random() & 1;
96 Bool flip_y = random() & 1;
97 int max = width + (height / 2);
98 int *lines = (int *)calloc(max, sizeof(int));
101 for(i = 0; i < width/2; i++)
102 lines[i] = i*2+height;
103 for(i = 0; i < height/2; i++)
104 lines[i+width/2] = i*2;
105 for(i = 0; i < width/2; i++)
106 lines[i+width/2+height/2] = width-i*2-(width%2?0:1)+height;
110 for (i = 0; i < max; i++)
113 if (lines[i] < height)
114 x = 0, y = lines[i], x2 = width, y2 = y;
116 x = lines[i]-height, y = 0, x2 = x, y2 = height;
119 x = width-x, x2 = width-x2;
121 y = height-y, y2 = height-y2;
123 XDrawLine (dpy, window, gc, x, y, x2, y2);
125 if (delay > 0 && ((i % granularity) == 0))
126 usleep (delay*granularity);
133 quad_wipe (Display *dpy, Window window, GC gc,
134 int width, int height, int delay, int granularity)
136 Bool flip_x = random() & 1;
137 Bool flip_y = random() & 1;
138 int max = width + height;
139 int *lines = (int *)calloc(max, sizeof(int));
144 for (i = 0; i < max/4; i++)
147 lines[i*4+1] = height-i*2-(height%2?0:1);
148 lines[i*4+2] = height+i*2;
149 lines[i*4+3] = height+width-i*2-(width%2?0:1);
152 for (i = 0; i < max; i++)
155 if (lines[i] < height)
156 x = 0, y = lines[i], x2 = width, y2 = y;
158 x = lines[i]-height, y = 0, x2 = x, y2 = height;
161 x = width-x, x2 = width-x2;
163 y = height-y, y2 = height-y2;
165 XDrawLine (dpy, window, gc, x, y, x2, y2);
167 if (delay > 0 && ((i % granularity) == 0))
168 usleep (delay*granularity);
176 circle_wipe (Display *dpy, Window window, GC gc,
177 int width, int height, int delay, int granularity)
181 int start = random() % full;
182 int rad = (width > height ? width : height);
186 for (i = (inc > 0 ? 0 : full);
187 (inc > 0 ? i < full : i > 0);
190 XFillArc(dpy, window, gc,
191 (width/2)-rad, (height/2)-rad, rad*2, rad*2,
192 (i+start) % full, inc);
194 usleep (delay*granularity);
200 three_circle_wipe (Display *dpy, Window window, GC gc,
201 int width, int height, int delay, int granularity)
207 int inc = full / 240;
208 int start = random() % q;
209 int rad = (width > height ? width : height);
211 for (i = 0; i < q; i += inc)
213 XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
214 (start+i) % full, inc);
215 XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
216 (start-i) % full, -inc);
218 XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
219 (start+q2+i) % full, inc);
220 XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
221 (start+q2-i) % full, -inc);
223 XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
224 (start+q2+q2+i) % full, inc);
225 XFillArc(dpy, window, gc, (width/2)-rad, (height/2)-rad, rad*2, rad*2,
226 (start+q2+q2-i) % full, -inc);
229 usleep (delay*granularity);
235 squaretate (Display *dpy, Window window, GC gc,
236 int width, int height, int delay, int granularity)
238 int steps = (((width > height ? width : width) * 2) / granularity);
240 Bool flip = random() & 1;
244 points[0].x = width-points[0].x; \
245 points[1].x = width-points[1].x; \
246 points[2].x = width-points[2].x; } \
247 XFillPolygon (dpy, window, gc, points, 3, Convex, CoordModeOrigin)
249 for (i = 0; i < steps; i++)
257 points[2].y = points[0].y + ((i * height) / steps);
263 points[1].y = height;
264 points[2].x = ((i * width) / steps);
265 points[2].y = height;
269 points[0].y = height;
271 points[1].y = height;
273 points[2].y = height - ((i * height) / steps);
277 points[0].y = height;
280 points[2].x = width - ((i * width) / steps);
286 usleep (delay * granularity);
294 static Eraser erasers[] = {
306 erase_window(Display *dpy, Window window, GC gc,
307 int width, int height, int mode, int delay)
309 int granularity = 25;
311 if (mode < 0 || mode >= countof(erasers))
312 mode = random() % countof(erasers);
313 (*(erasers[mode])) (dpy, window, gc, width, height, delay, granularity);
314 XClearWindow (dpy, window);
320 erase_full_window(Display *dpy, Window window)
322 XWindowAttributes xgwa;
326 int erase_speed, erase_mode;
329 s = get_string_resource("eraseSpeed", "Integer");
331 erase_speed = get_integer_resource("eraseSpeed", "Integer");
336 s = get_string_resource("eraseMode", "Integer");
338 erase_mode = get_integer_resource("eraseMode", "Integer");
343 XGetWindowAttributes (dpy, window, &xgwa);
344 black.flags = DoRed|DoGreen|DoBlue;
345 black.red = black.green = black.blue = 0;
346 XAllocColor(dpy, xgwa.colormap, &black);
347 gcv.foreground = black.pixel;
348 erase_gc = XCreateGC (dpy, window, GCForeground, &gcv);
349 erase_window (dpy, window, erase_gc, xgwa.width, xgwa.height,
350 erase_mode, erase_speed);
351 XFreeColors(dpy, xgwa.colormap, &black.pixel, 1, 0);
352 XFreeGC(dpy, erase_gc);
358 #include "screenhack.h"
360 char *progclass = "Erase";
361 char *defaults [] = {
365 XrmOptionDescRec options [] = {0};
366 int options_size = 0;
369 screenhack (dpy, window)
377 XWindowAttributes xgwa;
378 XGetWindowAttributes (dpy, window, &xgwa);
379 white.flags = DoRed|DoGreen|DoBlue;
380 white.red = white.green = white.blue = 0xFFFF;
381 XAllocColor(dpy, xgwa.colormap, &white);
382 gcv.foreground = white.pixel;
383 gc = XCreateGC (dpy, window, GCForeground, &gcv);
387 XFillRectangle(dpy, window, gc, 0, 0, 1280, 1024);
390 erase_full_window(dpy, window);