HP Change Display, v0.2

///////////////////////////
// RPG-esque HP Display  //
// v0.2                  //
// 18th August, 2020     //
// For ZC 2.55 Alpha 80+ //
// By: ZoriaRPG          //
///////////////////////////

namespace hphealth
{
    enum colourtype { cNONE, cWHITE, cGREY, cBLUE, cRED = 0xE1 };

    const int OLDHP_INDX = 19;
    const int OLDHP_DIFF = 20;
    const int SPAWN_CLK = 21;
    const int DRAW_CLK = 22;
    const int INITIALISED = 23;
    const int SPAWNCLKDUR = 60;
    const int HPCLOCKDUR = 40;

    const int DMG_COLOUR = cRED;
    const int DMG_OUTLINE = cWHITE;
    const int HEAL_OUTLINE = cWHITE;
    const int HEAL_COLOUR = cBLUE;

    const int DRAW_LAYER = 6;
    const int XOFS = -4;
    const int YOFS = -4;

    global script test
    {
        void run()
        {
            while(1)
            {
                for ( int q = Screen->NumNPCs(); q > 0; --q )
                {
                    npc n = Screen->LoadNPC(q);
                    init_enemy_hp(n);
                    do_npc_hp_clock(n);
                    update_npc_hp(n);
                    draw_npc_hp_change(n);
                }
                init_hero_hp();
                do_hero_hp_clock();
                update_hero_hp();
                draw_hero_hp_change();
                Waitdraw();
                Waitframe();
            }
        }
    }


    void do_npc_hp_clock(npc n)
    {
        ++n->Misc[SPAWN_CLK];
    }

    void init_enemy_hp(npc n)
    {
        unless ( n->Misc[INITIALISED] )
        {
            n->Misc[OLDHP_INDX] = n->HP;
            n->Misc[INITIALISED] = 1;
        }
    }
    void update_npc_hp(npc n)
    {
        if ( n->Family == NPCT_LANMOLA )
        {
            if ( n->HitBy[2] )
            {
                printf("Lanmola hit.\n");
            }



        }
        else
        {
            if ( n->Misc[DRAW_CLK] == 0 && (n->HitBy[2] || n->Family == NPCT_MOLDORM) && n->HP != n->Misc[OLDHP_INDX] )
            {
                n->Misc[OLDHP_DIFF] = n->HP - n->Misc[OLDHP_INDX];
                n->Misc[DRAW_CLK] = HPCLOCKDUR;
            }
        }

    }

    void draw_npc_hp_change(npc n)
    {
        if (  n->Misc[SPAWN_CLK] < SPAWNCLKDUR ) return;
        if ( --n->Misc[DRAW_CLK] > 0 && n->Misc[OLDHP_DIFF] )
        {
            int buffer[8];
            int buffer2[8];
            itoa(buffer,n->Misc[OLDHP_DIFF]);
            if ( n->Misc[OLDHP_DIFF] > 0 )
            {
                buffer2[0] = '+';
            }
            strcat(buffer2, buffer);

            Screen->DrawString
            (
                DRAW_LAYER,
                n->X + XOFS,
                n->Y + YOFS,
                FONT_Z3SMALL,
                ((n->Misc[OLDHP_DIFF]<0) ? DMG_COLOUR : HEAL_COLOUR),
                -1,
                0,
                buffer2,
                128,
                SHD_OUTLINED8,
                ((n->Misc[OLDHP_DIFF]<0) ? DMG_OUTLINE : HEAL_OUTLINE)
            );


        }
        else
        {
            n->Misc[DRAW_CLK] = 0;
            n->Misc[OLDHP_INDX] = n->HP;
        }
    }
    void do_hero_hp_clock()
    {
        ++Hero->Misc[SPAWN_CLK];
    }

    void init_hero_hp()
    {
        unless ( Hero->Misc[INITIALISED] )
        {
            Hero->Misc[OLDHP_INDX] = Hero->HP;
            Hero->Misc[INITIALISED] = 1;
        }
    }
    void update_hero_hp()
    {

        if ( Hero->Misc[DRAW_CLK] == 0 && Hero->HP != Hero->Misc[OLDHP_INDX] )
        {
            Hero->Misc[OLDHP_DIFF] = Hero->HP - Hero->Misc[OLDHP_INDX];
            Hero->Misc[DRAW_CLK] = HPCLOCKDUR;
        }
    }



    void draw_hero_hp_change()
    {
        if ( --Hero->Misc[DRAW_CLK] > 0 && Hero->Misc[OLDHP_DIFF] )
        {

            int buffer[8];
            int buffer2[8];

            itoa(buffer,Hero->Misc[OLDHP_DIFF]);
            if ( Hero->Misc[OLDHP_DIFF] > 0 )
            {
                buffer2[0] = '+';
            }
            strcat(buffer2, buffer);

            Screen->DrawString
            (
                DRAW_LAYER,
                Hero->X + XOFS,
                Hero->Y + YOFS,
                FONT_Z3SMALL,
                ((Hero->Misc[OLDHP_DIFF]<0) ? DMG_COLOUR : HEAL_COLOUR),
                -1,
                0,
                buffer2,
                128,
                SHD_OUTLINED8,
                ((Hero->Misc[OLDHP_DIFF]<0) ? DMG_OUTLINE : HEAL_OUTLINE)
            );
        }
        else
        {
            Hero->Misc[DRAW_CLK] = 0;
            Hero->Misc[OLDHP_INDX] = Hero->HP;
        }
    }
}