source-engine/game/client/hl1/hl1_hud_health.cpp

//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: 
//
// $NoKeywords: $
//
//=============================================================================//
//
// Health.cpp
//
// implementation of CHudHealth class
//
#include "cbase.h"
#include "hud.h"
#include "hud_macros.h"
#include "view.h"

#include "iclientmode.h"

#include "hl1_hud_numbers.h"

#include <KeyValues.h>
#include <vgui/ISurface.h>
#include <vgui/ISystem.h>
#include <vgui_controls/Panel.h>

using namespace vgui;

#include "hudelement.h"

#include "convar.h"

#define INIT_HEALTH -1

#define FADE_TIME	100
#define MIN_ALPHA	100	

//-----------------------------------------------------------------------------
// Purpose: Health panel
//-----------------------------------------------------------------------------
class CHudHealth : public CHudElement, public CHL1HudNumbers
{
	DECLARE_CLASS_SIMPLE( CHudHealth, CHL1HudNumbers );

public:
	CHudHealth( const char *pElementName );

	void			Init( void );
	void			VidInit( void );
	void			Reset( void );
	void			OnThink();
	void			MsgFunc_Damage(bf_read &msg);

private:
	void	Paint( void );
	void	ApplySchemeSettings(vgui::IScheme *pScheme);

private:
	CHudTexture		*icon_cross;
	int				m_iHealth;
	float			m_flFade;
	int				m_bitsDamage;
};	

DECLARE_HUDELEMENT( CHudHealth );
DECLARE_HUD_MESSAGE( CHudHealth, Damage );

//-----------------------------------------------------------------------------
// Purpose: Constructor
//-----------------------------------------------------------------------------
CHudHealth::CHudHealth( const char *pElementName ) : CHudElement( pElementName ), BaseClass(NULL, "HudHealth")
{
	SetHiddenBits( HIDEHUD_HEALTH | HIDEHUD_PLAYERDEAD | HIDEHUD_NEEDSUIT );
}

//-----------------------------------------------------------------------------
// Purpose: 
//-----------------------------------------------------------------------------
void CHudHealth::Init()
{
	HOOK_HUD_MESSAGE( CHudHealth, Damage );
	Reset();
}

//-----------------------------------------------------------------------------
// Purpose: 
//-----------------------------------------------------------------------------
void CHudHealth::Reset()
{
	m_iHealth		= INIT_HEALTH;
	m_flFade			= 0;
	m_bitsDamage	= 0;
}

//-----------------------------------------------------------------------------
// Purpose: 
//-----------------------------------------------------------------------------
void CHudHealth::VidInit()
{
	Reset();
	BaseClass::VidInit();
}

//-----------------------------------------------------------------------------
// Purpose: 
//-----------------------------------------------------------------------------
void CHudHealth::OnThink()
{
	int x = 0;
	C_BasePlayer *local = C_BasePlayer::GetLocalPlayer();
	if ( local )
	{
		// Never below zero
		x = MAX( local->GetHealth(), 0 );
	}

	// Only update the fade if we've changed health
	if ( x == m_iHealth )
	{
		return;
	}

	m_flFade = FADE_TIME;
	m_iHealth = x;
}

void CHudHealth::Paint()
{
	Color	clrHealth;
	int		a;
	int		x;
	int		y;

	BaseClass::Paint();

	if ( !icon_cross )
	{
		icon_cross = gHUD.GetIcon( "cross" );
	}

	if ( !icon_cross )
	{
		return;
	}

	// Has health changed? Flash the health #
	if ( m_flFade )
	{
		m_flFade -= ( gpGlobals->frametime * 20 );
		if ( m_flFade <= 0 )
		{
			a = MIN_ALPHA;
			m_flFade = 0;
		}
		else
		{
			// Fade the health number back to dim
			a = MIN_ALPHA +  ( m_flFade / FADE_TIME ) * 128;
		}
	}
	else
	{
		a = MIN_ALPHA;
	}

	// If health is getting low, make it bright red
	if ( m_iHealth <= 15 )
		a = 255;
		
	if (m_iHealth > 25)
	{
		int r, g, b, nUnused;

		(gHUD.m_clrYellowish).GetColor( r, g, b, nUnused );
		clrHealth.SetColor( r, g, b, a );
	}
	else
	{
		clrHealth.SetColor( 250, 0, 0, a );
	}

	int nFontWidth	= GetNumberFontWidth();
	int nFontHeight	= GetNumberFontHeight();
	int nCrossWidth	= icon_cross->Width();

	x = nCrossWidth / 2;
	y = GetTall() - ( nFontHeight * 1.5 );

	icon_cross->DrawSelf( x, y, clrHealth );

	x = nCrossWidth + ( nFontWidth / 2 );

	x = DrawHudNumber( x, y, m_iHealth, clrHealth );

	x += nFontWidth / 2;

	int iHeight	= nFontHeight;
	int iWidth	= nFontWidth / 10;

	clrHealth.SetColor( 255, 160, 0, a  );
	vgui::surface()->DrawSetColor( clrHealth );
	vgui::surface()->DrawFilledRect( x, y, x + iWidth, y + iHeight );
}

//-----------------------------------------------------------------------------
// Purpose: 
//-----------------------------------------------------------------------------
void CHudHealth::MsgFunc_Damage(bf_read &msg)
{
	msg.ReadByte();	// armor
	msg.ReadByte();	// health
	msg.ReadLong();	// damage bits

	Vector vecFrom;

	vecFrom.x = msg.ReadBitCoord();
	vecFrom.y = msg.ReadBitCoord();
	vecFrom.z = msg.ReadBitCoord();
}

void CHudHealth::ApplySchemeSettings(vgui::IScheme *pScheme)
{
	BaseClass::ApplySchemeSettings(pScheme);
	SetPaintBackgroundEnabled(false);
}