/* forest.c (aka xtree.c), Copyright (c) 1999
* Peter Baumung <unn6@rz.uni-karlsruhe.de>
*
* Most code taken from
* xscreensaver, Copyright (c) 1992, 1995, 1997
* Jamie Zawinski <jwz@netscape.com>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
/* ****************************** NOTE ******************************
This is not the xlockmore version of forest, but a much better
looking rewrite. Be careful not to delete it in a merging frenzy...
**********************************************************************
*/
#ifdef STANDALONE
# define DEFAULTS "*delay: 500000 \n" \
"*ncolors: 20 \n" \
"*fpsSolid: true \n" \
# include "xlockmore.h" /* from the xscreensaver distribution */
# define free_trees 0
# define release_trees 0
# define reshape_trees 0
# define trees_handle_event 0
#else /* !STANDALONE */
# include "xlock.h" /* from the xlockmore distribution */
#endif /* !STANDALONE */
ENTRYPOINT ModeSpecOpt trees_opts = {0, NULL, 0, NULL, NULL};
typedef struct {
int x;
int y;
int thick;
double size;
long color;
int toDo;
int pause;
int season;
} treestruct;
static treestruct *trees = NULL;
static XColor colors[20];
static int color;
static long colorM[12] = {0xff0000, 0xff8000, 0xffff00, 0x80ff00,
0x00ff00, 0x00ff80, 0x00ffff, 0x0080ff,
0x0000ff, 0x8000ff, 0xff00ff, 0xff0080};
static long colorV[12] = {0x0a0000, 0x0a0500, 0x0a0a00, 0x050a00,
0x000a00, 0x000a05, 0x000a0a, 0x00050a,
0x00000a, 0x05000a, 0x0a000a, 0x0a0005};
ENTRYPOINT void
init_trees(ModeInfo * mi)
{
treestruct *tree;
Display *display = MI_DISPLAY(mi);
GC gc = MI_GC(mi);
int i;
if (trees == NULL) {
if (mi->npixels > 20) {
printf("%d colors selected. Setting limit to 20...\n", mi->npixels);
mi->npixels = 20;
}
if (mi->npixels < 4) {
for (i = 0; i < mi->npixels; i++) {
colors[i].red = 65535 * (i & 1);
colors[i].green = 65535 * (i & 1);
colors[i].blue = 65535 * (i & 1);
colors[i].flags = DoRed | DoGreen | DoBlue;
}
} else {
if (mi->npixels < 8) {
for (i = 0; i < mi->npixels; i++) {
colors[i].red = 32768 + 4096 * (i % 4);
colors[i].green = 32768 + 4096 * (i % 4);
colors[i].blue = 32768 + 4096 * (i % 4);
colors[i].flags = DoRed | DoGreen | DoBlue;
}
} else {
for (i = 0; i < mi->npixels; i++) {
colors[i].red = 24576 + 4096 * (i % 4);
colors[i].green = 10240 + 2048 * (i % 4);
colors[i].blue = 0;
colors[i].flags = DoRed | DoGreen | DoBlue;
}
}
}
for (i = 0; i < mi->npixels; i++)
if (!XAllocColor(display, mi->xgwa.colormap, &colors[i])) break;
color = i;
XSetForeground(display, gc, colors[1].pixel);
}
MI_INIT (mi, trees);
XClearWindow(display, MI_WINDOW(mi));
XSetLineAttributes(display, gc, 2, LineSolid, CapButt, JoinMiter);
tree = &trees[MI_SCREEN(mi)];
tree->toDo = 25;
tree->season = NRAND(12);
for (i = 4; i < mi->npixels; i++) {
int sIndex = (tree->season + (i-4) / 4) % 12;
long color = colorM[sIndex] - 2 * colorV[sIndex] * (i % 4);
colors[i].red = (color & 0xff0000) / 256;
colors[i].green = (color & 0x00ff00);
colors[i].blue = (color & 0x0000ff) * 256;
colors[i].flags = DoRed | DoGreen | DoBlue;
}
for (i = 0; i < mi->npixels; i++)
if (!XAllocColor(display, mi->xgwa.colormap, &colors[i])) break;
color = i;
}
static double rRand(double a, double b)
{
return (a+(b-a)*NRAND(10001)/10000.0);
}
static void draw_line(ModeInfo * mi,
int x1, int y1, int x2, int y2,
double angle, int widths, int widthe)
{
Display *display = MI_DISPLAY(mi);
GC gc = MI_GC(mi);
double sns = 0.5*widths*sin(angle + M_PI_2);
double css = 0.5*widths*cos(angle + M_PI_2);
double sne = 0.5*widthe*sin(angle + M_PI_2);
double cse = 0.5*widthe*cos(angle + M_PI_2);
int xs1 = (int) (x1-sns);
int xs2 = (int) (x1+sns);
int ys1 = (int) (y1-css);
int ys2 = (int) (y1+css);
int xe1 = (int) (x2-sne);
int xe2 = (int) (x2+sne);
int ye1 = (int) (y2-cse);
int ye2 = (int) (y2+cse);
int i;
for (i = 0; i < widths; i++) {
if (color >= 4)
XSetForeground(display, gc, colors[i*4/widths].pixel);
XDrawLine(display, MI_WINDOW(mi), gc,
xs1+(xs2-xs1)*i/widths, ys1+(ys2-ys1)*i/widths,
xe1+(xe2-xe1)*i/widths, ye1+(ye2-ye1)*i/widths);
}
}
static void draw_tree_rec(ModeInfo * mi, double thick, int x, int y, double angle)
{
treestruct *tree = &trees[MI_SCREEN(mi)];
Display *display = MI_DISPLAY(mi);
GC gc = MI_GC(mi);
int length = (24+NRAND(12))*tree->size;
int a = (int) (x - length*sin(angle));
int b = (int) (y - length*cos(angle));
int i;
draw_line(mi, x, y, a, b, angle, thick*tree->size, 0.68*thick*tree->size);
if (thick > 2) {
draw_tree_rec(mi, 0.68*thick, a, b, 0.8*angle+rRand(-0.2, 0.2));
if (thick < tree->thick-1) {
draw_tree_rec(mi, 0.68*thick, a, b, angle+rRand(0.2, 0.9));
draw_tree_rec(mi, 0.68*thick, (a+x)/2, (b+y)/2, angle-rRand(0.2, 0.9));
}
}
if (thick < 0.5*tree->thick) {
int nleaf = 12 + NRAND(4);
XArc leaf[16];
for (i = 0; i < nleaf; i++) {
leaf[i].x = a + (int) (tree->size * rRand(-12, 12));
leaf[i].y = b + (int) (tree->size * rRand(-12, 12));
leaf[i].width = (int) (tree->size * rRand(2, 6));
leaf[i].height = leaf[i].width;
leaf[i].angle1 = 0;
leaf[i].angle2 = 360 * 64;
}
if (mi->npixels >= 4)
XSetForeground(display, gc, colors[tree->color+NRAND(4)].pixel);
XFillArcs(display, MI_WINDOW(mi), gc, leaf, nleaf);
}
}
ENTRYPOINT void
draw_trees(ModeInfo * mi)
{
treestruct *tree = &trees[MI_SCREEN(mi)];
int width = MI_WIN_WIDTH(mi);
int height = MI_WIN_HEIGHT(mi);
if (tree->pause == 1) {
tree->pause--;
init_trees(mi);
} else if (tree->pause > 1) {
tree->pause--;
return;
} else if (--(tree->toDo) == 0) {
tree->pause = 6;
return;
}
tree->x = NRAND(width);
tree->y = (int) (1.25 * height * (1 - tree->toDo / 23.0));
tree->thick = rRand(7, 12);
tree->size = height / 480.0;
if (color < 8) {
tree->color = 0;
} else {
tree->color = 4 * (1 + NRAND(color / 4 - 1));
}
draw_tree_rec(mi, tree->thick, tree->x, tree->y, rRand(-0.1, 0.1));
}
XSCREENSAVER_MODULE_2 ("Forest", forest, trees)
