Game Programming - All in One (3rd Edition)/game_prog_all_in_one_3rd_ed.iso/sources/TankWar-Final/bullet.cpp

C/C++ Source or Header | 2006-09-17 | 5.6 KB | 188 lines

/////////////////////////////////////////////////////////////////////////
// Game Programming All In One, Third Edition
// Tank War Final - bullet.c
/////////////////////////////////////////////////////////////////////////

#include "tankwar.h"



void updateexplosion(int window, int num)
{
    if (explosions[window][num]->alive)
    {
        //draw explosion in enemy window (target)
        explosions[window][num]->updateAnimation();
        if (explosions[window][num]->curframe == explosions[window][num]->totalframes-1)
            explosions[window][num]->alive = 0;
        explosions[window][num]->drawframe(buffer);

    }

    //play "end of explosion" sound
    play_sample(sounds[HARP], VOLUME, PAN, PITCH, FALSE);
}

void explode(int num, int x, int y)
{
    if (!explosions[num][0]->alive)
    {
        explosions[num][0]->curframe = 0;
        explosions[num][0]->framecount = 0;
        explosions[num][0]->x = x - explosions[num][0]->width/2 + 16;
        explosions[num][0]->y = y - explosions[num][0]->height/2 + 16;
        explosions[num][0]->alive = 1;
    }

    if (!explosions[num][1]->alive)
    {

        //draw explosion in my window
        int x = scrollx[!num] + SCROLLW/2;
        int y = scrolly[!num] + SCROLLH/2;

        //is enemy tank visible in my window?
        if (inside(x, y,
            scrollx[num], scrolly[num],
            scrollx[num] + SCROLLW, scrolly[num] + SCROLLH))
        {
            //draw explosion in own window if enemy is visible
            explosions[num][1]->curframe = 0;
            explosions[num][1]->framecount = 0;
            explosions[num][1]->x = startx[num]+x-scrollx[num] - 48;
            explosions[num][1]->y = starty[num]+y-scrolly[num] - 48;
            explosions[num][1]->alive = 1;
        }
    }
}

void drawbullets()
{
    int x,y;

    //is the bullet active?
    for (int num=0; num<2; num++)
    {
        if (bullets[num]->alive)
        {
            x = bullets[num]->x;
            y = bullets[num]->y;

            //draw bullet sprite in window if visible
            if (inside(x, y, scrollx[num], scrolly[num],
                scrollx[num] + SCROLLW,
                scrolly[num] + SCROLLH))
            {
                //draw bullet, adjust for scroll
                x = startx[num] - scrollx[num] + x;
                y = starty[num] - scrolly[num] + y;

                //rotate sprite, adjust for Allegro's 16.16 fixed trig
                int angle = bullets[num]->moveAngle + 90;
                rotate_sprite(buffer, bullets[num]->image, x, y,
                    itofix(angle / 0.7f / 2.0f));
            }
        }
    }
}

void movebullets()
{
    int tx, ty;

    for (int num=0; num<2; num++)
    {

        //is the bullet active?
        if (!bullets[num]->alive) return;

        //move bullet
        //bullets[num]->updatePosition();
        bullets[num]->x += bullets[num]->velx;
        bullets[num]->y += bullets[num]->vely;
        int x = bullets[num]->x;
        int y = bullets[num]->y;

        //stay within the virtual screen
        if (x < 0 || x > mapwidth*mapblockwidth-6 || y < 0 || y > mapheight*mapblockheight-6)
        {
            //reload
            bullets[num]->alive = 0;
            play_sample(sounds[AMMO], VOLUME, PAN, PITCH, FALSE);
            return;
        }

        //look for a direct hit using basic collision
        tx = scrollx[!num] + SCROLLW/2;
        ty = scrolly[!num] + SCROLLH/2;

        //start at center of scroll window, subtract 16 from
        //each side to encompass the tank
        if (inside(x,y,tx-16,ty-16,tx+16,ty+16))
        {
            //kill the bullet
            bullets[num]->alive = 0;

            //draw explosion in enemy window
            tanks[!num]->velx=0;
            tanks[!num]->vely=0;
            explode(num, tanks[!num]->x, tanks[!num]->y);
            health[!num] -= 2;
            if (health[!num] < 1) {
                gamestate = STATE_VICTORY;
                rest(200);
                play_midi(music_victory, 1);
                clear_keybuf();
            }

            //play explosion sounds
            play_sample(sounds[GOOPY], VOLUME, PAN, PITCH, FALSE);
            play_sample(sounds[HIT1], VOLUME, PAN, PITCH, FALSE);
            play_sample(sounds[HIT2], VOLUME, PAN, PITCH, FALSE);

            //kill any "near miss" sounds
            if (num)
                stop_sample(sounds[SCREAM]);
            else
                stop_sample(sounds[OHHH]);
        }

        else if (inside(x,y,tx-30,ty-30,tx+30,ty+30))
        {
            //it's a near miss!
            if (num)
                //player 1 screams
                play_sample(sounds[SCREAM], VOLUME, PAN, PITCH, FALSE);
            else
                //player 2 ohhhs
                play_sample(sounds[OHHH], VOLUME, PAN, PITCH, FALSE);

        }
    }
}


void fireweapon(int num)
{
    //ready to fire again?
    if (!bullets[num]->alive)
    {
        //fire the bullet
        bullets[num]->alive = 1;
        bullets[num]->x = scrollx[num] + SCROLLW/2;
        bullets[num]->y = scrolly[num] + SCROLLH/2;

        //adjust velocity based on angle
        int angle = tanks[num]->moveAngle - 90;
        if (angle < 0) angle = 360 + angle;
        bullets[num]->moveAngle = angle;
        bullets[num]->velx = calcAngleMoveX(angle) * BULLETSPEED;
        bullets[num]->vely = calcAngleMoveY(angle) * BULLETSPEED;

        play_sample(sounds[FIRE], VOLUME, PAN, PITCH, FALSE);
    }
}