nsaver.c

开放源码实时操作系统源码.

/*
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is NanoScreenSaver.
 *
 * The Initial Developer of the Original Code is Alex Holden.
 * Portions created by Alex Holden are Copyright (C) 2000
 * Alex Holden <[e-mail]>. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms
 * of the GNU General Public license (the  "[GNU] License"), in which case the
 * provisions of [GNU] License are applicable instead of those
 * above.  If you wish to allow use of your version of this file only
 * under the terms of the [GNU] License and not to allow others to use
 * your version of this file under the MPL, indicate your decision by
 * deleting  the provisions above and replace  them with the notice and
 * other provisions required by the [GNU] License.  If you do not delete
 * the provisions above, a recipient may use your version of this file
 * under either the MPL or the [GNU] License.
 */
/*
 * A collection of screen savers for Nano-X by Alex Holden.
 */

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <sys/time.h>

#define MWINCLUDECOLORS
#include "nano-X.h"
#include "nsaver.h"

void *my_malloc(size_t size)
{
	void *ret;

	if(!(ret = malloc(size))) {
		fprintf(stderr, "Out of memory\n");
		exit(1);
	}

	return ret;
}

void get_random_point_on_screen(nstate *state, GR_COORD *x, GR_COORD *y,
							GR_COLOR *c)
{
	if(x) {
		*x = (int) RANDRANGE(0, (state->si.cols - 1.0));
	}
	if(y) {
		*y = (int) RANDRANGE(0, (state->si.rows - 1.0));
	}
	if(c) {
		*c = MWPALINDEX((int)RANDRANGE(0, (state->si.ncolors - 1)));
	}
}

void saver1_init(nstate *state) {}

void saver1_exposure(nstate *state)
{
	GrClearWindow(state->main_window, 0);
}

void saver1_animate(nstate *state) {}

void saver2_init(nstate *state)
{
	(int)state->priv = SAVER2_MAXPIXELS;
	state->animate_interval = SAVER2_DELAY;
}

void saver2_exposure(nstate *state)
{
	GrClearWindow(state->main_window, 0);
}

void saver2_animate(nstate *state)
{
	GR_COORD x, y;
	GR_COLOR c;
	int pixels = SAVER2_PIXELS_PER_FRAME;

	while(pixels--) {
		if(!((int)state->priv--)) {
			(int)state->priv = SAVER2_MAXPIXELS;
			GrClearWindow(state->main_window, 0);
		}
		get_random_point_on_screen(state, &x, &y, &c);
		GrSetGCForeground(state->main_gc, c);
		GrPoint(state->main_window, state->main_gc, x, y);
	}
}

void saver3_init(nstate *state)
{
	s3state *s = my_malloc(sizeof(s3state));
	state->priv = s;
	s->maxsegments = SAVER3_MAXSEGMENTS;
	s->lastx = 0;
	s->lasty = 0;
	state->animate_interval = SAVER3_DELAY;
}

void saver3_exposure(nstate *state)
{
	GrClearWindow(state->main_window, 0);
}

void saver3_animate(nstate *state)
{
	GR_COORD newx, newy;
	GR_COLOR c;
	s3state *s = state->priv;
	int pixels = SAVER3_SEGMENTS_PER_FRAME;

	while(pixels--) {
		if(!(s->maxsegments--)) {
			s->maxsegments = SAVER3_MAXSEGMENTS;
			GrClearWindow(state->main_window, 0);
		}
		get_random_point_on_screen(state, &newx, &newy, &c);
		GrSetGCForeground(state->main_gc, c);
		GrLine(state->main_window, state->main_gc, s->lastx, s->lasty,
							newx, newy);
		s->lastx = newx;
		s->lasty = newy;
	}
}

void saver4_init(nstate *state)
{
	int i;

	s4state *s = my_malloc(sizeof(s4state));
	state->priv = s;

	s->length = 0;

	for(i = 0; i < SAVER4_NUMWORMS; i++) {
		s->tip = 0;
		get_random_point_on_screen(state, &s->worms[i].points[0].x,
						&s->worms[i].points[0].y,
						&s->worms[i].colour);
	}

	state->animate_interval = SAVER4_DELAY;
}

void saver4_exposure(nstate *state)
{
	int i;
	s4state *s = state->priv;

	GrClearWindow(state->main_window, 0);

	if(!s->length) return;

	for(i = 0; i < SAVER4_NUMWORMS; i++) {
		GrSetGCForeground(state->main_gc, s->worms[i].colour);
		GrPoints(state->main_window, state->main_gc, s->length,
							s->worms[i].points);
	}
}

void saver4_get_new_worm_position(nstate *state, s4state *s, int worm,
						GR_COORD *newx, GR_COORD *newy)
{
	int i;
	GR_COORD oldx = s->worms[worm].points[s->tip].x;
	GR_COORD oldy = s->worms[worm].points[s->tip].y;

	do {
		i = (int)RANDRANGE(0, 3.0);
		switch(i) {
			case 0:
				*newx = oldx + 1;
				if(*newx == state->si.cols) *newx = 0;
				break;
			case 1:
				*newx = oldx - 1;
				if(*newx == -1) *newx = state->si.cols - 1;
				break;
			case 2:
				*newx = oldx;
				break;
		}

		i = (int)RANDRANGE(0, 3.0);
		switch(i) {
			case 0:
				*newy = oldy + 1;
				if(*newy == state->si.rows) *newy = 0;
				break;
			case 1:
				*newy = oldy - 1;
				if(*newy == -1) *newy = state->si.rows - 1;
				break;
			case 2:
				*newy = oldy;
				break;
		}
	} while((*newx == oldx) && (*newy == oldy));
}

int saver4_worm_collides(nstate *state, s4state *s, int x, int y, int thisworm,
								int thispoint)
{
	int i, n;

	for(i = 0; i < SAVER4_NUMWORMS; i++) {
		for(n = 0; n < s->length; n++) {
			if((i == thisworm) && (n == thispoint)) continue;
			if((s->worms[i].points[n].x == x) &&
					(s->worms[i].points[n].y) == y) {
				return 1;
			}
		}
	}
	return 0;
}

void saver4_animate(nstate *state)
{
	int i, newx, newy, tail, newtip, tries;
	s4state *s = state->priv;

	if(s->length == SAVER4_WORMLENGTH) tail = s->tip + 1;
	else tail = 0;
	if(tail == SAVER4_WORMLENGTH) tail = 0;
	newtip = s->tip + 1;
	if(newtip == SAVER4_WORMLENGTH) newtip = 0;
	
	for(i = 0; i < SAVER4_NUMWORMS; i++) {
		if(!saver4_worm_collides(state, s, s->worms[i].points[tail].x,
					s->worms[i].points[tail].y, i, tail)) {
			GrSetGCForeground(state->main_gc, BLACK);
			GrPoint(state->main_window, state->main_gc,
					s->worms[i].points[tail].x,
					s->worms[i].points[tail].y);
		}
		for(tries = SAVER4_COLLISION_RELUCTANCE; tries; tries--) {
				saver4_get_new_worm_position(state, s, i, &newx,
									&newy);
			if(!saver4_worm_collides(state, s, newx, newy, -1, -1))
				break;
		}
		s->worms[i].points[newtip].x = newx;
		s->worms[i].points[newtip].y = newy;
		if(tries) {
			GrSetGCForeground(state->main_gc, s->worms[i].colour);
			GrPoint(state->main_window, state->main_gc, newx, newy);
		}
	}

	s->tip = newtip;
	if(s->length < SAVER4_WORMLENGTH) s->length++;
}

void saver5_init(nstate *state)
{
	int i;

	s5state *s = my_malloc(sizeof(s5state));
	state->priv = s;

	s->numstars = 0;

	for(i = 0; i < SAVER5_NUMSTARS; i++) {
		s->stars[i].angle = RANDRANGE(0, (2 * M_PI));
		s->stars[i].pos = 1;
	}

	state->animate_interval = SAVER5_DELAY;
}

int saver5_drawstar(nstate *state, s5state *s, int star, int delete)
{
	int opp, adj;
	GR_COORD x, y;

	if(delete) GrSetGCForeground(state->main_gc, BLACK);
	else GrSetGCForeground(state->main_gc, WHITE);

	opp = (int)(sin(s->stars[star].angle) * s->stars[star].pos);
	adj = (int)(cos(s->stars[star].angle) * s->stars[star].pos);

	x = (state->si.cols / 2) + adj;
	y = (state->si.rows / 2) + opp;

	if((x < 0) || (y < 0) || (x >= state->si.cols) || (y >= state->si.rows))
		return 1;

	GrPoint(state->main_window, state->main_gc, x, y);

	return 0;
}

void saver5_exposure(nstate *state)
{
	int i;
	s5state *s = state->priv;

	GrClearWindow(state->main_window, 0);

	for(i = 0; i < SAVER5_NUMSTARS; i++) {
		saver5_drawstar(state, s, i, 0);
	}
}

void saver5_animate(nstate *state)
{
	int i;
	double position, scale, increment;
	s5state *s = state->priv;

	if(s->numstars < SAVER5_NUMSTARS) {
		s->numstars += SAVER5_STARS_INCREMENT;
		if(s->numstars > SAVER5_NUMSTARS)
			s->numstars = SAVER5_NUMSTARS;
	}

	for(i = 0; i < s->numstars; i++) {
		saver5_drawstar(state, s, i, 1);
		position = (double)s->stars[i].pos /
				(double)(state->si.cols / 2);
		scale = sin((position * M_PI_2) + M_PI + M_PI_2) + 1.0;
		increment = (scale * SAVER5_STARS_ACCEL_RATE) + 1;
		s->stars[i].pos += (int) increment;
		if(saver5_drawstar(state, s, i, 0)) {
			s->stars[i].pos = 1;
			s->stars[i].angle = RANDRANGE(0, (2 * M_PI));
			saver5_drawstar(state, s, i, 0);
		}
	}
}

void saver6_init(nstate *state)
{
	int i, n;

	s6state *s = my_malloc(sizeof(s6state));
	state->priv = s;

	s->new_bolt_time = 0;

	for(i = 0; i < SAVER6_MAXBOLTS; i++) {
		s->bolts[i].duration = 0;
		for(n = 0; n < SAVER6_MAXFORKS; n++) {
			s->bolts[i].forks[n].valid = 0;
		}
	}

	state->animate_interval = SAVER6_DELAY;
}

void saver6_drawfork(nstate *state, s6state *s, int bolt, int fork, int delete)
{
	int i;

	if(delete) GrSetGCForeground(state->main_gc, BLACK);
	for(i = 0; i < SAVER6_THICKNESS; i++) {
		if(!delete) {
			if((i < 2) || (i >= SAVER6_THICKNESS - 2))
				 GrSetGCForeground(state->main_gc, LTBLUE);
			else GrSetGCForeground(state->main_gc, WHITE);
		}
		GrPoly(state->main_window, state->main_gc,
				s->bolts[bolt].forks[fork].valid,
				s->bolts[bolt].forks[fork].vertices[i]);
	}
}

void saver6_drawbolt(nstate *state, s6state *s, int bolt, int delete)
{
	int n;

	for(n = 0; n < SAVER6_MAXFORKS; n++)
		if(s->bolts[bolt].forks[n].valid)
			saver6_drawfork(state, s, bolt, n, delete);
}

void saver6_drawlightning(nstate *state, s6state *s, int delete)
{
	int i;

	for(i = 0; i < SAVER6_MAXBOLTS; i++) {
		if(s->bolts[i].duration) {
			if(delete) s->bolts[i].duration--;
			saver6_drawbolt(state, s, i, delete);
		}
	}
}

void saver6_exposure(nstate *state)
{
	s6state *s = state->priv;

	GrClearWindow(state->main_window, 0);

	saver6_drawlightning(state, s, 0);
}

void saver6_setvertices(s6state *s, int bolt, int fork, int vert, GR_COORD x,
								GR_COORD y)
{
	int i;

	for(i = 0; i < SAVER6_THICKNESS; i++) {
		s->bolts[bolt].forks[fork].vertices[i][vert].x = x + i;
		s->bolts[bolt].forks[fork].vertices[i][vert].y = y;
	}
}

void saver6_perturb(nstate *state, GR_COORD *x, GR_COORD *y, int maxperturb)
{
	*x += (int)RANDRANGE(0, (maxperturb - 1.0)) -
				(double)(maxperturb / 2.0);
	if(*x < 0) *x = 0;
	if(*x > (state->si.cols - 1)) *x = state->si.cols - 1;

	*y += (int)RANDRANGE(0, (maxperturb - 1.0)) -
				(double)(maxperturb / 2.0);
	if(*y < 0) *y = 0;
	if(*y > (state->si.cols - 1)) *y = state->si.cols - 1;
}

void saver6_makefork(nstate *state, s6state *s, int bolt, int fork, GR_COORD x,
								GR_COORD y)
{
	int i, vertices;
	double length, incr, pos, angle, scale;
	GR_COORD ex, ey, nx, ny, xlen, ylen;

	saver6_setvertices(s, bolt, fork, 0, x , y);

	scale = (double)(state->si.rows - y) / (double)state->si.rows;

	vertices = (int)(scale * RANDRANGE(SAVER6_MINFULLVERTICES,
						SAVER6_MAXVERTICES));

	if(vertices < SAVER6_MINVERTICES) vertices = SAVER6_MINVERTICES;

	s->bolts[bolt].forks[fork].valid = vertices;

	ey = state->si.rows - SAVER6_MAXEND_Y +
		(int)RANDRANGE(0, SAVER6_MAXEND_Y - 1.0);
	if((ey - y) <= 0) ey = SAVER6_MINDROP;
	if(ey >= (state->si.rows - 1)) ey = state->si.rows - 1;

	if(!fork) {
		ex = x + (int)RANDRANGE(0, ((state->si.cols - 1.0) / 2.0));
	} else {
		ex = x + (int)(RANDRANGE(0, (ey - y)) / 2.0) - ((ey - y) / 2.0);
	}

	if(ex >= state->si.cols) ex = state->si.cols - 1;
	if(ex < 0) ex = 0;

	xlen = MAX(x, ex) - MIN(x, ex);
	ylen = MAX(y, ey) - MIN(y, ey);

	length = sqrt(((double)(xlen * xlen) + (double)(ylen * ylen)));
	incr = length / (vertices - 1);
	angle = atan(((double)xlen / (double)ylen));

	for(i = vertices - 1; i ; i--) {