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/* BubbleFishyMon dockapp
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
*/
/* Huw Giddens 2003-10-28: Added missing copyright boilerplate. Corrected the
* calculation that keeps the fish in the water, and put it in its own
* function adjust_y().
*/
#define _GNU_SOURCE
#define VERSION "1.23"

/* general includes */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <math.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <getopt.h>

/* x11 includes */
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include <X11/Xresource.h>

#include "include/sprites.h"
#include "include/fishmon.h"
#include "include/chars.h"

#include "include/bubblemon.h"
#include "include/sys_include.h"

/* *INDENT-OFF* */
/* drawing */
void draw_cmap_image(void);
void draw_sprite(int x, int y, int idx);
void draw_sprite_alpha(int x, int y, int idx, int alpha);
void draw_string(int dx, int dy, char *string);
void draw_ascii(int x, int y, char digit);
void putpixel(int x, int y, float i, int linewidth, int color);

/* stuff */
void fishmon_update(void);
void bubble_update(void);
void fish_update(void);
void weed_update(void);

#ifdef ENABLE_TIME
void time_update(void);
void anti_line(int x1, int y1, int x2, int y2, int linewidth, int color);
#endif

/* misc support functions */
void prepare_sprites(void);

/* global variables */
extern BubbleMonData bm;
extern int fish_traffic;
extern int time_enabled;

/* 34 sprites:
* 0, 2, 4, 6, 8, 10, 12, 14 - fish left
* 1, 3, 5, 7, 9, 11, 13, 15 - fish right
* 16, 17, 18, 19, 20 - grass
* 21, 22, 23, 24, 25 - small fish
* 26, 27, 28, 29, 30 - bubbles
* 31 - thermometer and the "liquid"
*/
Sprite sp[34] = {
/* 00 */ { 17, 14, 0, 0, NULL }, /* left swim fish */
/* 01 */ { 17, 14, 18, 0, NULL }, /* right swim fish */
/* 02 */ { 17, 14, 0, 15, NULL }, /* left swim fish 1 */
/* 03 */ { 17, 14, 18, 15, NULL }, /* right swim fish 1 */
/* 04 */ { 17, 14, 0, 30, NULL }, /* left swim fish 2 */
/* 05 */ { 17, 14, 18, 30, NULL }, /* right swim fish 2 */
/* 06 */ { 17, 14, 0, 45, NULL }, /* left turn begin */
/* 07 */ { 17, 14, 18, 45, NULL }, /* right turn begin */
/* 08 */ { 17, 14, 0, 60, NULL }, /* facing */
/* 09 */ { 17, 14, 18, 60, NULL }, /* facing */
/* 10 */ { 17, 14, 0, 75, NULL }, /* left mouth open */
/* 11 */ { 17, 14, 18, 75, NULL }, /* right mouth open */
/* 12 */ { 17, 14, 0, 90, NULL }, /* left mouth open 1 */
/* 13 */ { 17, 14, 18, 90, NULL }, /* right mouth open 1 */
/* 14 */ { 17, 14, 0, 105, NULL }, /* left mouth open 2 */
/* 15 */ { 17, 14, 18, 105, NULL }, /* right mouth open 2 */

/* 16 */ { 17, 12, 0, 120, NULL }, /* grass 1 */
/* 17 */ { 17, 12, 18, 120, NULL }, /* grass 2 */
/* 18 */ { 17, 12, 0, 135, NULL }, /* grass 3 */
/* 19 */ { 17, 12, 18, 135, NULL }, /* grass 4 */
/* 20 */ { 17, 12, 0, 150, NULL }, /* grass 5 */

/* 21 */ { 11, 8, 0, 180, NULL }, /* small fish huge */
/* 22 */ { 11, 7, 0, 189, NULL }, /* small fish big */
/* 23 */ { 9, 6, 0, 197, NULL }, /* small fish small */
/* 24 */ { 7, 4, 10, 197, NULL }, /* small fish little */
/* 25 */ { 7, 3, 10, 202, NULL }, /* small fish tiny */

/* 26 */ { 5, 5, 19, 196, NULL }, /* bubble huge */
/* 27 */ { 5, 3, 19, 204, NULL }, /* bubble big */
/* 28 */ { 3, 3, 27, 196, NULL }, /* bubble small */
/* 29 */ { 2, 2, 27, 202, NULL }, /* bubble little */
/* 30 */ { 1, 1, 33, 196, NULL }, /* bubble tiny */

/* 31 */ { 6, 35, 26, 151, NULL }, /* thermometer case */

            { 0, 0, 0, 0, NULL } /* terminator */
};

/* animation sequence loop for fish [4 frames, loop] */
int fish_animation[4] = { 0, 2, 4, 2 };
/* animation sequence loop for weeds [8 frames, loop] */
int weed_animation[8] = { 16, 17, 18, 19, 20, 19, 18, 17 };
/* animation sequence loop for turning fish [4 frames, no loop] */
int turn_animation[8] = { 6, 8, 7, 1, 7, 9, 6, 0 };
/* "x offset" sequence for bubbles moving upward */
int bubble_sequence[5] = { -2, -2, -1, 0, 0 };
/* keeps track of mouse focus */
/* keeps track of distance between bubble state changes (depends on YMAX) */
extern int bubble_state_change;
/* day of week */
/* *INDENT-ON* */

void traffic_fish_update(void);

/* update fish, bubbles, temperature, etc */
void fishmon_update(void)
{
    memset(&bm.image, 0, CMAPSIZE);

    /* check for new mail if enabled and no new mail exists */
    /*
check_mail();
if (new_mail)
*/
    weed_update();

    /* update each fish position */
if(fish_traffic)
{
traffic_fish_update();
}
else
{
fish_update();
}

    /* done with sprites - now draw colormap-based image */
    draw_cmap_image();

    /* draw bubbles - done after everything else because we blend them
* on top of everything */

    /* draw thermometer 80 - alpha
draw_sprite_alpha(49, 20, 31, 80); */


} /* fishmon_update */


void weed_update(void)
{
    int i;

    for (i = 0; i < 2; i++) {

if (bm.weeds[i].delay++ <= 20) {
draw_sprite(bm.weeds[i].where, WEEDY,
weed_animation[bm.weeds[i].frame]);
continue;
}

/* process frame shifting */
bm.weeds[i].delay = 0;
draw_sprite(bm.weeds[i].where, WEEDY,
weed_animation[bm.weeds[i].frame]);
bm.weeds[i].frame++;
if (bm.weeds[i].frame > 7)
bm.weeds[i].frame = 0;
    }
}

void bubble_update(void)
{
    Bubble *bubbles = bm.bubbles;
    int i, x, y;
    int seq;

    /* make a new bubble, if needed */
    if ((bm.nr_bubbles < MAXBUBBLE) && ((rand() % 101) <= 32)) {
bm.bubbles[bm.nr_bubbles].x = (rand() % XMAX);
bm.bubbles[bm.nr_bubbles].y = MAKEY(YMAX);
bm.bubbles[bm.nr_bubbles].dy = 0;
bm.nr_bubbles++;
    }

    /* Update and draw the bubbles */
    for (i = 0; i < bm.nr_bubbles; i++) {
/* Accelerate the bubble */
bubbles[i].dy -= 64;

/* Move the bubble vertically */
bubbles[i].y += bubbles[i].dy;

/* Did we lose it? */
if (bubbles[i].y < 0) {
/* Yes; nuke it */
bubbles[i].x = bubbles[bm.nr_bubbles - 1].x;
bubbles[i].y = bubbles[bm.nr_bubbles - 1].y;
bubbles[i].dy = bubbles[bm.nr_bubbles - 1].dy;
bm.nr_bubbles--;

/* We must check the previously last bubble, which is
* now the current bubble, also. */
i--;
continue;
}
/* Draw the bubble */
x = bubbles[i].x;
y = bubbles[i].y;

/* convert to standard dimension */
y = REALY(y);
/* calculate bubble sequence - 0 to 4 (determine bubble sprite idx) */
seq = y / bubble_state_change;

/* draw the bubble, using offset-to-center calculated from current
* sequence, and make the bubble bigger as we go up. 120 - alpha */
draw_sprite_alpha(x + bubble_sequence[seq], y, 26 + seq, 120);
    }
}

/* This function adjusts a passed y value so that it's not less than the
* water level. 0 on the y axis is at the top of the frame. This is called by
* fish_update() and traffic_fish_update(). It returns the corrected value.
*/
static int adjust_y(int y)
{
/* Pigeon
Make sure the fish is in the water :) */
int min_y = (YMAX * (100 - bm.mem_percent))/100;

if(y <= min_y) return min_y;
else return y;
}

void fish_update(void)
{
    int i, j;

    for (i = 0; i < NRFISH; i++) {

/* frozen fish doesn't need to be handled, or drawn */
if (bm.fishes[i].speed == 0)
continue;

/* randomly make fish change direction mid-way
* but only if it isn't turning already and if it isn't
* scared */
if (((rand() % 255) == 128) && (bm.fishes[i].turn != 1)) {
bm.fishes[i].turn = 1;
bm.fishes[i].frame = 0;
bm.fishes[i].speed = 1;
bm.fishes[i].delay = 0;
}

/* move fish in horizontal direction, left or right */
if (!bm.fishes[i].rev) {
bm.fishes[i].tx -= bm.fishes[i].speed;
if (bm.fishes[i].tx < -18 - bm.fishes[i].travel) {
/* we moved out of bounds. change direction,
* position, speed. */
bm.fishes[i].travel = rand() % 32;
bm.fishes[i].tx = -18 - bm.fishes[i].travel;
bm.fishes[i].rev = 1;
bm.fishes[i].y = rand() % (YMAX - 14);
bm.fishes[i].speed = (rand() % 2) + 1;
}
} else {
bm.fishes[i].tx += bm.fishes[i].speed;
if (bm.fishes[i].tx > XMAX + bm.fishes[i].travel) {
/* we moved out of bounds. change direction,
* position, speed. */
bm.fishes[i].travel = rand() % 32;
bm.fishes[i].tx = XMAX + bm.fishes[i].travel;
bm.fishes[i].rev = 0;
bm.fishes[i].y = rand() % (YMAX - 14);
bm.fishes[i].speed = (rand() % 2) + 1;
}
}

/* move fish in vertical position randomly by one pixel up or down */
j = rand() % 16;
if (j <= 4)
{
bm.fishes[i].y--;
}
else if (j > 12)
{
bm.fishes[i].y++;
}

bm.fishes[i].y = adjust_y(bm.fishes[i].y);

/* handle fish currently turning around */
if (bm.fishes[i].turn) {
int turnframe;

/* turn_animation array keeps sprite indexes for turning fish
* around. 0-3 - ltr turn, 4-7 = rtl turn - rev determines
* if we use ltr or rtl parts by multiplying by 4 */
turnframe = turn_animation[bm.fishes[i].frame + ((bm.fishes[i].rev) * 4)];
draw_sprite(bm.fishes[i].tx, bm.fishes[i].y, turnframe);

/* because this is a special case, handle updating things here.
* notice, delay is lowered (quicker turn), and rev is also
* flipped after turn completion */
bm.fishes[i].delay += bm.fishes[i].speed;
if (bm.fishes[i].delay >= 5) {
if (++bm.fishes[i].frame >= 4) {
bm.fishes[i].frame = 0;
bm.fishes[i].rev = !bm.fishes[i].rev;
bm.fishes[i].turn = 0;
bm.fishes[i].speed = (rand() % 2) + 1;
}
bm.fishes[i].delay = 0;
}
/* get to the next fish */
continue;

} else {
/* animate fishes using fish_animation array */
draw_sprite(bm.fishes[i].tx, bm.fishes[i].y,
bm.fishes[i].rev +
fish_animation[bm.fishes[i].frame]);
}

/* switch to next swimming frame */
bm.fishes[i].delay += bm.fishes[i].speed;
if (bm.fishes[i].delay >= 10) {
if (++bm.fishes[i].frame > 3)
bm.fishes[i].frame = 0;
bm.fishes[i].delay = 0;
}
    }
}

void copy_sprite_data(int sx, int sy, int w, int h, unsigned char *to)
{
    int i, j;

    for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
to[(i * w) + j] = THE_DATA[((sy + i) * HWIDTH) + (sx + j)];
}
    }
}

void prepare_sprites(void)
{
    int i = 0;

    i = height;
    i = 0;

    while (sp[i].w) {
if (sp[i].data)
free(sp[i].data);
sp[i].data = calloc(1, sp[i].w * sp[i].h);
copy_sprite_data(sp[i].srcx, sp[i].srcy, sp[i].w, sp[i].h,
sp[i].data);
i++;
    }

if(fish_traffic)
{
for (i = 0; i < NRFISH; i++)
{
if(i < (NRFISH / 2))
{
bm.fishes[i].tx = -18 - rand() % XMAX;
bm.fishes[i].y = 50;
bm.fishes[i].rev = 1;
bm.fishes[i].speed = 0;
}
else
{
bm.fishes[i].tx = XMAX + rand() % XMAX;
bm.fishes[i].y = 50;
bm.fishes[i].rev = 0;
bm.fishes[i].speed = 0;
}
}

}
else
{
for (i = 0; i < NRFISH; i++) {
bm.fishes[i].y = 50;
bm.fishes[i].rev = (i % 2) ? 1 : 0;
bm.fishes[i].tx = rand() % XMAX;
bm.fishes[i].speed = (rand() % 2) + 1;
}
}

    bm.weeds[0].where = -5;
    bm.weeds[0].frame = rand() % 7;

    bm.weeds[1].where = 42;
    bm.weeds[1].frame = rand() % 7;

}

/********************************************************************
* *
* Drawing Functions below *
* *
********************************************************************/

/* draw XMAX x YMAX colormap image into the main rgb buffer */
void draw_cmap_image(void)
{
    int i;
    unsigned char cmap;

    for (i = 0; i < CMAPSIZE; i++) {
if ((cmap = bm.image[i]) != 0) {
int pos = i * 3;
bm.rgb_buf[pos++] = THE_CMAP[cmap][0];
bm.rgb_buf[pos++] = THE_CMAP[cmap][1];
/*
* Looks nicer without this :)
bm.rgb_buf[pos] = THE_CMAP[cmap][2];
*/
}
    }
}

/* draw a sprite into bm.image (palette-based) */
void draw_sprite(int x, int y, int idx)
{
    /* bounding box of the clipped sprite */
    int dw, di, dh, ds;
    /* loop counters */
    int w, h;
    /* offset into image buffer */
    int pos;

    /* cmap reference for each pixel */
    unsigned char cmap;

    assert(idx >= 0);

    /* completely off the screen, don't bother drawing */
    if ((y < -(sp[idx].h)) || (y > YMAX) ||
(x > XMAX) || (x < -(sp[idx].w)))
return;

    /* do clipping for top side */
    ds = 0;
    if (y < 0)
ds = -(y);

    /* do clipping for bottom side */
    dh = sp[idx].h;
    if ((y + sp[idx].h) > YMAX)
dh = YMAX - y;

    /* do clipping for right side */
    dw = sp[idx].w;
    if (x > (XMAX - sp[idx].w))
dw = sp[idx].w - (x - (XMAX - sp[idx].w));

    /* do clipping for left side */
    di = 0;
    if (x < 0)
di = -(x);

    for (h = ds; h < dh; h++) {
/* offset to beginning of current row */
int ypos = (h + y) * XMAX;
for (w = di; w < dw; w++) {
if ((cmap = sp[idx].data[h * sp[idx].w + w]) != 0) {
pos = ypos + w + x;
bm.image[pos] = cmap;
}
}
    }
}

/* draw a sprite into bm.rgb_buf with alpha-blend */
void draw_sprite_alpha(int x, int y, int idx, int alpha)
{
    /* bounding box of the clipped sprite */
    int dw, di, dh, ds;
    /* loop counters */
    int w, h;
    /* offset into rgb buffer */
    int pos;

    /* cmap reference for each pixel */
    unsigned char cmap;

    /* completely off the screen, don't bother drawing */
    if ((y < -(sp[idx].h)) || (y > YMAX) ||
(x > XMAX) || (x < -(sp[idx].w)))
return;

    /* do clipping for top side */
    ds = 0;
    if (y < 0)
ds = -(y);

    /* do clipping for bottom side */
    dh = sp[idx].h;
    if ((y + sp[idx].h) > YMAX)
dh = YMAX - y;

    /* do clipping for right side */
    dw = sp[idx].w;
    if (x > (XMAX - sp[idx].w))
dw = sp[idx].w - (x - (XMAX - sp[idx].w));

    /* do clipping for left side */
    di = 0;
    if (x < 0)
di = -(x);

    for (h = ds; h < dh; h++) {
/* offset to beginning of current row */
int ypos = (h + y) * XMAX;
for (w = di; w < dw; w++) {
if ((cmap = sp[idx].data[h * sp[idx].w + w]) != 0) {
unsigned char r, g, b;

pos = (ypos + w + x) * 3;
r = THE_CMAP[cmap][0];
g = THE_CMAP[cmap][1];
b = THE_CMAP[cmap][2];

bm.rgb_buf[pos] = (alpha * (int) bm.rgb_buf[pos]
+ (256 - alpha) * (int) r) >> 8;

bm.rgb_buf[pos + 1] = (alpha * (int) bm.rgb_buf[pos + 1]
+ (256 - alpha) * (int) g) >> 8;

bm.rgb_buf[pos + 2] = (alpha * (int) bm.rgb_buf[pos + 2]
+ (256 - alpha) * (int) b) >> 8;
}
}
    }
}

/* draw string using the draw_ascii function below. Please make sure the
* output doesn't go outside the dockapp as no checking is performed! */
void draw_string(int dx, int dy, char *string)
{
    char c = 0;

    while ((c = *string++)) {
draw_ascii(dx, dy, c);
if (c != '-')
dx += 6;
else
dx += 5;
    }
}

/* draw digits 0..9, letters A..Z, and "-"
* Clipping not performed! Must be inside dockapp at all times! */
void draw_ascii(int dx, int dy, char digit)
{
    char *source = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ- ";
    int idx = strchr(source, digit) - source;
    int x, y;

    /* handle "space" here */
    if (idx == 37)
return;

    for (y = 0; y < 7; y++) {
for (x = 0; x < 6; x++) {
int src = font_data[(y * 222 + x) + (idx * 6)];
if (src) {
int pos = ((y + dy) * XMAX * 3) + (x + dx) * 3;
bm.rgb_buf[pos + 0] = font_cmap[src][0];
bm.rgb_buf[pos + 1] = font_cmap[src][1];
bm.rgb_buf[pos + 2] = font_cmap[src][2];
}
}
    }
}


/* put alpha-blended pixel on the backbuffer. Uses floats, could be
* optimized, probably */
void putpixel(int x, int y, float i, int linewidth, int color)
{
    int pos = (y * XMAX * 3) + x * 3;

    unsigned char r = ((color >> 16) & 0xff) * i + (bm.rgb_buf[pos]) * (1 - i);
    unsigned char g = ((color >> 8) & 0xff) * i + (bm.rgb_buf[pos + 1]) * (1 - i);
    unsigned char b = (color & 0xff) * i + (bm.rgb_buf[pos + 2]) * (1 - i);

    if (linewidth == 1) {
bm.rgb_buf[pos] = r;
bm.rgb_buf[pos + 1] = g;
bm.rgb_buf[pos + 2] = b;
    } else {
int dx, dy;
for (dx = x; dx < x + linewidth; dx++) {
for (dy = y; dy < y + linewidth; dy++) {
pos = (dy * XMAX * 3) + dx * 3;
bm.rgb_buf[pos] = r;
bm.rgb_buf[pos + 1] = g;
bm.rgb_buf[pos + 2] = b;
}
}
    }
}


void traffic_fish_update()
{
    int i, j;

int rx_speed = net_rx_speed();
int tx_speed = net_tx_speed();

    for (i = 0; i < NRFISH; i++)
{
/* No traffic, do nothing */
if (bm.fishes[i].speed == 0 && rx_speed == 0 && tx_speed == 0)
{
continue;
}

if(i < (NRFISH / 2))
{
/* tx traffic */
if(bm.fishes[i].tx < XMAX)
{
if(bm.fishes[i].speed < tx_speed)
{
/* Slowly accelerate */
bm.fishes[i].speed += 1;
}

bm.fishes[i].tx += bm.fishes[i].speed;
}
else
{
/* Done once, go back */
bm.fishes[i].tx = -18 - rand() % XMAX;
bm.fishes[i].y = (rand() % (YMAX - 14));
if(tx_speed == 0)
{
/* Stop the fish when it's at the end... */
bm.fishes[i].speed = 0;
}
else
{
bm.fishes[i].speed = tx_speed;
}
}
}
else
{
/* rx traffic */
if(bm.fishes[i].tx > -18)
{
if(bm.fishes[i].speed < rx_speed)
{
/* Slowly accelerate */
bm.fishes[i].speed += 1;
}
bm.fishes[i].tx -= bm.fishes[i].speed;
}
else
{
/* Done once, go back */
bm.fishes[i].tx = XMAX + rand() % XMAX;
bm.fishes[i].y = (rand() % (YMAX - 14));
if(rx_speed == 0)
{
/* Stop the fish when it's at the end... */
bm.fishes[i].speed = 0;
}
else
{
bm.fishes[i].speed = rx_speed;
bm.fishes[i].tx -= bm.fishes[i].speed;
}
}
}

/* move fish in vertical position randomly by one pixel up or down */
j = rand() % 16;
if (j <= 4)
{
bm.fishes[i].y--;
}
else if (j > 12)
{
bm.fishes[i].y++;
}

bm.fishes[i].y = adjust_y(bm.fishes[i].y);

/* animate fishes using fish_animation array */
draw_sprite(bm.fishes[i].tx, bm.fishes[i].y,
bm.fishes[i].rev +
fish_animation[bm.fishes[i].frame]);

/* switch to next swimming frame */
bm.fishes[i].delay += bm.fishes[i].speed;
if (bm.fishes[i].delay >= 10) {
if (++bm.fishes[i].frame > 3)
bm.fishes[i].frame = 0;
bm.fishes[i].delay = 0;
}
    }

}

#ifdef ENABLE_TIME
void time_update(void)
{
    struct tm *data;
    time_t cur_time;
    static time_t old_time;

    int hr, min, sec;
    static int osec = -1;
    static int oday = -1;
    static int hdx, hdy, mdx, mdy, sdx, sdy;

    double psi;

    cur_time = time(NULL);

    if (cur_time != old_time) {
old_time = cur_time;

data = localtime(&cur_time);

hr = data->tm_hour % 12;
min = data->tm_min;
sec = data->tm_sec;

/* hours */
if ((sec % 15) == 0) {
psi = hr * (M_PI / 6.0);
psi += min * (M_PI / 360);
hdx = floor(sin(psi) * 26 * 0.55) + 28;
hdy = floor(-cos(psi) * 22 * 0.55) + 24;
}

/* minutes */
if ((sec % 15) == 0) {
psi = min * (M_PI / 30.0);
psi += sec * (M_PI / 1800);
mdx = floor(sin(psi) * 26 * 0.7) + 28;
mdy = floor(-cos(psi) * 22 * 0.7) + 24;
}

/* seconds */
if (osec != sec) {
psi = sec * (M_PI / 30.0);
sdx = floor(sin(psi) * 26 * 0.9) + 28;
sdy = floor(-cos(psi) * 22 * 0.9) + 24;
osec = sec;
}

/* see if we need to redraw the day/month/weekday deal */
if (data->tm_mday != oday) {
oday = data->tm_mday;
/* redundant calculation for a reason */
psi = hr * (M_PI / 6.0);
psi += min * (M_PI / 360);
hdx = floor(sin(psi) * 26 * 0.55) + 28;
hdy = floor(-cos(psi) * 22 * 0.55) + 24;
psi = min * (M_PI / 30.0);
psi += sec * (M_PI / 1800);
mdx = floor(sin(psi) * 26 * 0.7) + 28;
mdy = floor(-cos(psi) * 22 * 0.7) + 24;

/* reflash the backbuffer / date / weekday */
/* prepare_backbuffer(0); */
}
    }

    /* must redraw each frame */
    anti_line(28, 24, mdx, mdy, 1, 0xeeeeee);
    anti_line(28, 24, hdx, hdy, 1, 0xbf0000);
    anti_line(28, 24, sdx, sdy, 1, 0xc79f2b);

}

/* draw antialiased line from (x1, y1) to (x2, y2), with width linewidth
* color is an int like 0xRRGGBB */
void anti_line(int x1, int y1, int x2, int y2, int linewidth, int color)
{
    int dx = abs(x1 - x2);
    int dy = abs(y1 - y2);
    int error, sign, tmp;
    float ipix;
    int step = linewidth;

    if (dx >= dy) {
if (x1 > x2) {
tmp = x1;
x1 = x2;
x2 = tmp;
tmp = y1;
y1 = y2;
y2 = tmp;
}
error = dx / 2;
if (y2 > y1)
sign = step;
else
sign = -step;

putpixel(x1, y1, 1, linewidth, color);

while (x1 < x2) {
if ((error -= dy) < 0) {
y1 += sign;
error += dx;
}
x1 += step;
ipix = (float)error / dx;

if (sign == step)
ipix = 1 - ipix;

putpixel(x1, y1, 1, linewidth, color);
putpixel(x1, y1 - step, (1 - ipix), linewidth, color);
putpixel(x1, y1 + step, ipix, linewidth, color);
}
putpixel(x2, y2, 1, linewidth, color);
    } else {
if (y1 > y2) {
tmp = x1;
x1 = x2;
x2 = tmp;
tmp = y1;
y1 = y2;
y2 = tmp;
}
error = dy / 2;

if (x2 > x1)
sign = step;
else
sign = -step;

putpixel(x1, y1, 1, linewidth, color);

while (y1 < y2) {
if ((error -= dx) < 0) {
x1 += sign;
error += dy;
}
y1 += step;
ipix = (float)error / dy;

if (sign == step)
ipix = 1 - ipix;

putpixel(x1 ,y1, 1, linewidth, color);
putpixel(x1 - step, y1, (1 - ipix), linewidth, color);
putpixel(x1 + step, y1, ipix, linewidth, color);
}
putpixel(x2, y2, 1, linewidth, color);
    }
}
#endif
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