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/*

    Xroach - A game of skill.  Try to find the roaches under your windows.

    Ported to Nano-X by Greg Haerr

    Copyright 1991 by J.T. Anderson

    jta@locus.com

    This program may be freely distributed provided that all

    copyright notices are retained.

    Dedicated to Greg McFarlane.   (gregm@otc.otca.oz.au)

*/

char Copyright[] = "nxroach\nCopyright 1991 J.T. Anderson";

#include <stdio.h>

#include <math.h>

#include <signal.h>

#include <stdlib.h>

#include <time.h>

#define MWINCLUDECOLORS

#include "nano-X.h"

#define None    0

#define Pixmap  GR_WINDOW_ID

#include "roachmap.h"

#define SCAMPER_EVENT   99

typedef struct Roach {

    RoachMap *rp;

    int index;

    float x;

    float y;

    int intX;

    int intY;

    int hidden;

    int turnLeft;

    int steps;

} Roach;

GR_COORD display_width, display_height;

GR_GC_ID gc;

GR_COLOR roachColor = BLACK;

GR_REGION_ID rootVisible = 0;

GR_BOOL done = GR_FALSE;

GR_BOOL eventBlock = GR_FALSE;

Roach *roaches;

int maxRoaches = 10;

int curRoaches = 0;

float roachSpeed = 20.0;

void Usage(void);

void SigHandler(int sig);

void AddRoach(void);

void MoveRoach(int Rx);

void DrawRoaches(void);

void CoverRoot(void);

int CalcRootVisible(void);

int MarkHiddenRoaches(void);

int

main(int ac, char **av)

{

    int ax;

    char *arg;

    RoachMap *rp;

    int rx;

    float angle;

    GR_EVENT ev;

    int nVis;

    int needCalc;

    GR_SCREEN_INFO sinfo;

    /*

       Process command line options.

    */

    for (ax=1; ax<ac; ax++) {

        arg = av[ax];

        if (strcmp(arg, "-rc") == 0) {

            roachColor = atoi(av[++ax]);

        }

        else if (strcmp(arg, "-speed") == 0) {

            roachSpeed = atof(av[++ax]);

        }

        else if (strcmp(arg, "-roaches") == 0) {

            maxRoaches = strtol(av[++ax], (char **)NULL, 0);

        }

        else {

            Usage();

        }

    }

    srand((int)time((long *)NULL));

    /*

       Catch some signals so we can erase any visible roaches.

    */

    signal(SIGKILL, SigHandler);

    signal(SIGINT, SigHandler);

    signal(SIGTERM, SigHandler);

    signal(SIGHUP, SigHandler);

    if (GrOpen() < 0) {

        fprintf(stderr, "can't open graphics\n");

        exit(1);

    }

    GrGetScreenInfo(&sinfo);

    display_width = sinfo.cols;

    display_height = sinfo.rows;

    /*

       Create roach pixmaps at several orientations.

    */

    for (ax=0; ax<360; ax+=ROACH_ANGLE) {

        rx = ax / ROACH_ANGLE;

        angle = rx * 0.261799387799;

        rp = &roachPix[rx];

        rp->pixmap = GrNewPixmapFromData(rp->width, rp->height, WHITE, BLACK,

                rp->roachBits, GR_BMDATA_BYTEREVERSE|GR_BMDATA_BYTESWAP);

        rp->sine = sin(angle);

        rp->cosine = cos(angle);

    }

    roaches = (Roach *)malloc(sizeof(Roach) * maxRoaches);

    gc = GrNewGC();

    while (curRoaches < maxRoaches)

        AddRoach();

    GrSelectEvents(GR_ROOT_WINDOW_ID, GR_EVENT_MASK_EXPOSURE | GR_EVENT_MASK_CHLD_UPDATE);

    needCalc = 1;

    while (!done) {

        if (GrPeekEvent(&ev))

            GrGetNextEvent(&ev);

        else {

            if (needCalc) {

                needCalc = CalcRootVisible();

            }

            nVis = MarkHiddenRoaches();

            if (nVis) {

                ev.type = SCAMPER_EVENT;

            }

            else {

                DrawRoaches();

                eventBlock = GR_TRUE;

                GrGetNextEvent(&ev);

                eventBlock = GR_FALSE;

            }

        }

        switch (ev.type) {

            case SCAMPER_EVENT:

                for (rx=0; rx<curRoaches; rx++) {

                    if (!roaches[rx].hidden)

                        MoveRoach(rx);

                }

                DrawRoaches();

                GrDelay(100);

                break;

            case GR_EVENT_TYPE_EXPOSURE:

            case GR_EVENT_TYPE_CHLD_UPDATE:

                needCalc = 1;

                break;

        }

    }

    CoverRoot();

    GrClose();

    return 0;

}

void

Usage(void)

{

    fprintf(stderr, "Usage: nxroach [options]\n\n");

    fprintf(stderr, "Options:\n");

    fprintf(stderr, "       -rc      roachcolor\n");

    fprintf(stderr, "       -roaches numroaches\n");

    fprintf(stderr, "       -speed   roachspeed\n");

    exit(1);

}

void

SigHandler(int sig)

{

    /*

       If we are blocked, no roaches are visible and we can just bail

       out.  If we are not blocked, then let the main procedure clean

       up the root window.

    */

    if (eventBlock) {

        GrClose();

        exit(0);

    }

    else {

        done = GR_TRUE;

    }

}

/*

   Generate random integer between 0 and maxVal-1.

*/

int

RandInt(int maxVal)

{

        return rand() % maxVal;

}

/*

   Check for roach completely in specified rectangle.

*/

int

RoachInRect(Roach *roach, int rx, int ry, int x, int y,

        unsigned int width, unsigned int height)

{

    if (rx < x) return 0;

    if ((rx + roach->rp->width) > (x + width)) return 0;

    if (ry < y) return 0;

    if ((ry + roach->rp->height) > (y + height)) return 0;

    return 1;

}

/*

   Check for roach overlapping specified rectangle.

*/

int

RoachOverRect(Roach *roach, int rx, int ry, int x, int y,

        unsigned int width, unsigned int height)

{

    if (rx >= (x + width)) return 0;

    if ((rx + roach->rp->width) <= x) return 0;

    if (ry >= (y + height)) return 0;

    if ((ry + roach->rp->height) <= y) return 0;

    return 1;

}

/*

   Give birth to a roach.

*/

void

AddRoach(void)

{

    Roach *r;

    if (curRoaches < maxRoaches) {

        r = &roaches[curRoaches++];

        r->index = RandInt(ROACH_HEADINGS);

        r->rp = &roachPix[r->index];

        r->x = RandInt(display_width - r->rp->width);

        r->y = RandInt(display_height - r->rp->height);

        r->intX = -1;

        r->intY = -1;

        r->hidden = 0;

        r->steps = RandInt(200);

        r->turnLeft = RandInt(100) >= 50;

    }

}

/*

   Turn a roach.

*/

void

TurnRoach(Roach *roach)

{

    if (roach->index != (roach->rp - roachPix)) return;

    if (roach->turnLeft) {

        roach->index += (RandInt(30) / 10) + 1;

        if (roach->index >= ROACH_HEADINGS)

            roach->index -= ROACH_HEADINGS;

    }

    else {

        roach->index -= (RandInt(30) / 10) + 1;

        if (roach->index < 0)

            roach->index += ROACH_HEADINGS;

    }

}

/*

   Move a roach.

*/

void

MoveRoach(int rx)

{

    Roach *roach;

    Roach *r2;

    float newX;

    float newY;

    int ii;

    roach = &roaches[rx];

    newX = roach->x + (roachSpeed * roach->rp->cosine);

    newY = roach->y - (roachSpeed * roach->rp->sine);

    if (RoachInRect(roach, (int)newX, (int)newY,

                            0, 0, display_width, display_height)) {

        roach->x = newX;

        roach->y = newY;

        if (roach->steps-- <= 0) {

            TurnRoach(roach);

            roach->steps = RandInt(200);

        }

        for (ii=rx+1; ii<curRoaches; ii++) {

            r2 = &roaches[ii];

            if (RoachOverRect(roach, (int)newX, (int)newY,

                r2->intX, r2->intY, r2->rp->width, r2->rp->height)) {

                TurnRoach(roach);

            }

        }

    }

    else {

        TurnRoach(roach);

    }

}

/*

   Draw all roaches.

*/

void

DrawRoaches(void)

{

    Roach *roach;

    int rx;

    for (rx=0; rx<curRoaches; rx++) {

        roach = &roaches[rx];

        if (roach->intX >= 0) {

            GrClearArea(GR_ROOT_WINDOW_ID, roach->intX, roach->intY,

                roach->rp->width, roach->rp->height, GR_FALSE);

        }

    }

    for (rx=0; rx<curRoaches; rx++) {

        roach = &roaches[rx];

        if (!roach->hidden) {

            int size = roach->rp->width * roach->rp->height;

            GR_PIXELVAL roachbuf[size];

            GR_PIXELVAL screenbuf[size];

            int i;

            roach->intX = roach->x;

            roach->intY = roach->y;

            roach->rp = &roachPix[roach->index];

            /*

            //XSetForeground(display, gc, AllocNamedColor(roachColor, black));

            //XSetFillStyle(display, gc, FillStippled);

            //XSetStipple(display, gc, roach->rp->pixmap);

            //XSetTSOrigin(display, gc, roach->intX, roach->intY);

            //XFillRectangle(display, rootWin, gc,

                //roach->intX, roach->intY, roach->rp->width, roach->rp->height);

            */

            /* read roach bitmap*/

            GrReadArea(roach->rp->pixmap, 0, 0,

                roach->rp->width, roach->rp->height, roachbuf);

            /* read root window*/

            GrReadArea(GR_ROOT_WINDOW_ID, roach->intX, roach->intY,

                roach->rp->width, roach->rp->height, screenbuf);

            /* convert fg roach bitmap bits to roach color on root window bits*/

            for (i=0; i<size; ++i)

                    if (roachbuf[i] != BLACK)

                            screenbuf[i] = roachColor;

            /* write root window*/

            GrArea(GR_ROOT_WINDOW_ID, gc, roach->intX, roach->intY,

                roach->rp->width, roach->rp->height, screenbuf, MWPF_PIXELVAL);

        }

        else {

            roach->intX = -1;

        }

    }

    GrFlush();

}

/*

   Cover root window to erase roaches.

*/

void

CoverRoot(void)

{

    GR_WINDOW_ID roachWin;

    roachWin = GrNewWindow(GR_ROOT_WINDOW_ID, 0, 0, display_width, display_height,

                    0, CYAN, BLACK);

    GrLowerWindow(roachWin);

    GrMapWindow(roachWin);

    GrFlush();

}

/*

   Calculate Visible region of root window.

*/

int

CalcRootVisible(void)

{

    GR_REGION_ID covered;

    GR_REGION_ID visible;

    GR_WINDOW_ID parent;

    GR_WINDOW_ID *children;

    GR_COUNT nChildren;

    GR_COUNT wx;

    GR_RECT rect;

    GR_WINDOW_INFO info;

    /*

       Get children of root.

    */

    GrQueryTree(GR_ROOT_WINDOW_ID, &parent, &children, &nChildren);

    /*

       For each mapped child, add the window rectangle to the covered

       region.

    */

    covered = GrNewRegion();

    for (wx=0; wx<nChildren; wx++) {

        GrGetWindowInfo(children[wx], &info);

        if (info.unmapcount == 0) {

            rect.x = info.x;

            rect.y = info.y;

            rect.width = info.width;

            rect.height = info.height;

            GrUnionRectWithRegion(covered, &rect);

        }

    }

    free(children);

    /*

       Subtract the covered region from the root window region.

    */

    visible = GrNewRegion();

    rect.x = 0;

    rect.y = 0;

    rect.width = display_width;

    rect.height = display_height;

    GrUnionRectWithRegion(visible, &rect);

    GrSubtractRegion(visible, visible, covered);

    GrDestroyRegion(covered);

    /*

       Save visible region globally.

    */

    if (rootVisible)

        GrDestroyRegion(rootVisible);

    rootVisible = visible;

    /*

       Mark all roaches visible.

    */

    for (wx=0; wx<curRoaches; wx++)

        roaches[wx].hidden = 0;

    return 0;

}

/*

   Mark hidden roaches.

*/

int

MarkHiddenRoaches(void)

{

    int rx;

    Roach *r;

    int nVisible;

    nVisible = 0;

    for (rx=0; rx<curRoaches; rx++) {

        r = &roaches[rx];

        if (!r->hidden) {

            if (r->intX > 0 && GrRectInRegion(rootVisible, r->intX, r->intY,

                            r->rp->width, r->rp->height) == MWRECT_OUT) {

                r->hidden = 1;

            }

            else {

                nVisible++;

            }

        }

    }

    return nVisible;

}