BulletAct.cpp

An example of CSM_Bullet_ActFunc.

Parameters

pBul	A pointer to the bullet.
iLevel	The level of the bullet, starting from 1.

// pBul->count1 = Distance traveled so far
void ActBullet_MyWeapon(BULLET* pBul, int iLevel)
{
    // Level 1 sprite rects
    RECT rect1[2] =
    {
        RECT_XYWH(128, 32, 16, 16),
        RECT_XYWH(144, 32, 16, 16)
    };
    
    // Level 2 sprite rects
    RECT rect2[2] =
    {
        RECT_XYWH(160, 32, 16, 16),
        RECT_XYWH(176, 32, 16, 16)
    };
    
    // Level 3 sprite rects
    RECT rect3[2] =
    {
        RECT_XYWH(128, 48, 16, 16),
        RECT_XYWH(144, 48, 16, 16)
    };
    
    if (++pBul->count1 > pBul->life_count)
    {
        // We've exceeded our bullet range limit.
        
        // Spawn a 'pop!' effect
        SetCaret(pBul->x, pBul->y, 3, 0);
        
        // Delete the bullet
        pBul->cond = 0;
        
        return;
    }
    
    if (pBul->act_no == 0)
    {
        // Initialization act -- Switch to act 1 immediately
        pBul->act_no = 1;
 
        // Set velocity according to direction
        switch (pBul->direct)
        {
            case Directions::DIRECT_LEFT:
                pBul->xm = -0x1000;
                break;
            case Directions::DIRECT_UP:
                pBul->ym = -0x1000;
                break;
            case Directions::DIRECT_RIGHT:
                pBul->xm = 0x1000;
                break;
            case Directions::DIRECT_DOWN:
                pBul->ym = 0x1000;
                break;
        }
 
        // Set hitbox according to level & direction
        switch (iLevel)
        {
            case 1:
                switch (pBul->direct)
                {
                    case Directions::DIRECT_LEFT:
                        pBul->enemyYL = 0x400;
                        break;
                    case Directions::DIRECT_UP:
                        pBul->enemyXL = 0x400;
                        break;
                    case Directions::DIRECT_RIGHT:
                        pBul->enemyYL = 0x400;
                        break;
                    case Directions::DIRECT_DOWN:
                        pBul->enemyXL = 0x400;
                        break;
                }
                break;
            case 2:
                switch (pBul->direct)
                {
                    case Directions::DIRECT_LEFT:
                        pBul->enemyYL = 0x800;
                        break;
                    case Directions::DIRECT_UP:
                        pBul->enemyXL = 0x800;
                        break;
                    case Directions::DIRECT_RIGHT:
                        pBul->enemyYL = 0x800;
                        break;
                    case Directions::DIRECT_DOWN:
                        pBul->enemyXL = 0x800;
                        break;
                }
                break;
        }
    }
    else
    {
        // Add velocity to position
        pBul->x += pBul->xm;
        pBul->y += pBul->ym;
    }
    
    // Set the display sprite based on level & direction
    switch (iLevel)
    {
        case 1:
            if (pBul->direct == Directions::DIRECT_UP || pBul->direct == Directions::DIRECT_DOWN)
                pBul->rect = rect1[1];
            else
                pBul->rect = rect1[0];
            
            break;
        case 2:
            if (pBul->direct == Directions::DIRECT_UP || pBul->direct == Directions::DIRECT_DOWN)
                pBul->rect = rect2[1];
            else
                pBul->rect = rect2[0];
            
            break;
        case 3:
            if (pBul->direct == Directions::DIRECT_UP || pBul->direct == Directions::DIRECT_DOWN)
                pBul->rect = rect3[1];
            else
                pBul->rect = rect3[0];
            
            break;
    }
}