ECS System that renders dynamic health bars above entities. More...

#include <HealthBarSystem.hpp>

Inheritance diagram for gme::HealthBarSystem:

Collaboration diagram for gme::HealthBarSystem:

Public Member Functions
	HealthBarSystem (const std::shared_ptr< eng::IRenderer > &renderer)
	Constructor.

	~HealthBarSystem () override=default
	Destructor.

	HealthBarSystem (const HealthBarSystem &)=delete
	Deleted copy constructor (non-copyable)

HealthBarSystem &	operator= (const HealthBarSystem &)=delete
	Deleted copy assignment operator (non-copyable)

	HealthBarSystem (HealthBarSystem &&)=delete
	Deleted move constructor (non-movable)

HealthBarSystem &	operator= (HealthBarSystem &&)=delete
	Deleted move assignment operator (non-movable)

void	update (ecs::Registry &registry, float dt) override
	Update the health bar system (called each frame)

Public Member Functions inherited from ecs::ASystem
bool	isEnable () override

void	setEnable (const bool enable) override

Public Member Functions inherited from ecs::ISystem
virtual	~ISystem ()=default

Private Member Functions
eng::Color	getHealthColor (float healthPercent) const
	Calculate health bar color based on health percentage.

void	drawHealthBar (float x, float y, float currentHealth, float maxHealth)
	Render a health bar at specified position.

Private Attributes
const std::shared_ptr< eng::IRenderer > &	m_renderer
	Reference to the renderer for drawing.

Static Private Attributes
static constexpr float	BAR_WIDTH = 40.0f
	Width of the health bar in pixels.

static constexpr float	BAR_HEIGHT = 4.0f
	Height of the health bar in pixels.

static constexpr float	BAR_OFFSET_Y = -15.0f
	Vertical offset above entity (negative = above)

static constexpr float	BORDER_THICKNESS = 1.0f
	Thickness of the border around the bar.

static constexpr eng::Color	HEALTH_HIGH = {0, 255, 0, 255}
	Green color for >75% health.

static constexpr eng::Color	HEALTH_MEDIUM = {255, 255, 0, 255}
	Yellow color for 50-75% health.

static constexpr eng::Color	HEALTH_LOW = {255, 100, 0, 255}
	Orange color for 25-50% health.

static constexpr eng::Color	HEALTH_CRITICAL = {255, 0, 0, 255}
	Red color for <25% health.

static constexpr eng::Color	BACKGROUND = {50, 50, 50, 200}
	Dark gray background (semi-transparent)

static constexpr eng::Color	BORDER = {255, 255, 255, 255}
	White border color.

Detailed Description

ECS System that renders dynamic health bars above entities.

This system queries all entities with a Health component and renders a visual health bar above each entity. Features include:

Dynamic color based on health percentage (green -> yellow -> orange -> red)
Positioned above entities with configurable offset
Border and background for better visibility
Automatic health percentage calculation

The system is designed for multiplayer where multiple players and enemies need health indicators.

Definition at line 35 of file HealthBarSystem.hpp.

Constructor & Destructor Documentation

◆ HealthBarSystem() [1/3]

gme::HealthBarSystem::HealthBarSystem ( const std::shared_ptr< eng::IRenderer > & renderer )

explicit

Constructor.

Parameters

renderer Shared pointer to the rendering interface

Definition at line 14 of file HealthBarSystem.cpp.

◆ ~HealthBarSystem()

gme::HealthBarSystem::~HealthBarSystem ( )

overridedefault

Destructor.

◆ HealthBarSystem() [2/3]

gme::HealthBarSystem::HealthBarSystem ( const HealthBarSystem & )

delete

Deleted copy constructor (non-copyable)

◆ HealthBarSystem() [3/3]

gme::HealthBarSystem::HealthBarSystem ( HealthBarSystem && )

delete

Deleted move constructor (non-movable)

Member Function Documentation

◆ drawHealthBar()

void gme::HealthBarSystem::drawHealthBar	(	float	x,
		float	y,
		float	currentHealth,
		float	maxHealth )

private

Render a health bar at specified position.

Parameters

x	X position (center of entity)
y	Y position (center of entity)
currentHealth	Current health value
maxHealth	Maximum health value

Draws a layered health bar with:

White border
Dark gray background
Colored health fill (proportional to current/max health)

Definition at line 58 of file HealthBarSystem.cpp.

References BAR_OFFSET_Y, BAR_WIDTH, eng::IRenderer::createCircleShape(), eng::IRenderer::drawCircleShape(), getHealthColor(), and m_renderer.

Referenced by update().

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◆ getHealthColor()

eng::Color gme::HealthBarSystem::getHealthColor ( float healthPercent ) const

private

Calculate health bar color based on health percentage.

Parameters

healthPercent Health percentage (0.0 = dead, 1.0 = full health)

Returns: Color for the health bar fill

Color transitions:

>75%: Green (HEALTH_HIGH)
50-75%: Yellow (HEALTH_MEDIUM)
25-50%: Orange (HEALTH_LOW)
<25%: Red (HEALTH_CRITICAL)

Definition at line 38 of file HealthBarSystem.cpp.

References HEALTH_CRITICAL, HEALTH_HIGH, HEALTH_LOW, and HEALTH_MEDIUM.

Referenced by drawHealthBar().

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◆ operator=() [1/2]

HealthBarSystem & gme::HealthBarSystem::operator= ( const HealthBarSystem & )

delete

Deleted copy assignment operator (non-copyable)

◆ operator=() [2/2]

HealthBarSystem & gme::HealthBarSystem::operator= ( HealthBarSystem && )

delete

Deleted move assignment operator (non-movable)

◆ update()

void gme::HealthBarSystem::update	(	ecs::Registry &	registry,
		float	dt )

overridevirtual

Update the health bar system (called each frame)

Parameters

registry	ECS registry containing all entities
dt	Delta time since last frame (unused)

Iterates through all entities with Health and Transform components and renders a health bar above each one

Implements ecs::ISystem.

Definition at line 16 of file HealthBarSystem.cpp.

References drawHealthBar(), ecs::Registry::getAll(), and ecs::Registry::getComponent().

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Member Data Documentation

◆ BACKGROUND

eng::Color gme::HealthBarSystem::BACKGROUND = {50, 50, 50, 200}

staticconstexprprivate

Dark gray background (semi-transparent)

Definition at line 92 of file HealthBarSystem.hpp.

◆ BAR_HEIGHT

float gme::HealthBarSystem::BAR_HEIGHT = 4.0f

staticconstexprprivate

Height of the health bar in pixels.

Definition at line 83 of file HealthBarSystem.hpp.

◆ BAR_OFFSET_Y

float gme::HealthBarSystem::BAR_OFFSET_Y = -15.0f

staticconstexprprivate

Vertical offset above entity (negative = above)

Definition at line 84 of file HealthBarSystem.hpp.

Referenced by drawHealthBar().

◆ BAR_WIDTH

float gme::HealthBarSystem::BAR_WIDTH = 40.0f

staticconstexprprivate

Width of the health bar in pixels.

Definition at line 82 of file HealthBarSystem.hpp.

Referenced by drawHealthBar().

◆ BORDER

eng::Color gme::HealthBarSystem::BORDER = {255, 255, 255, 255}

staticconstexprprivate

White border color.

Definition at line 93 of file HealthBarSystem.hpp.

◆ BORDER_THICKNESS

float gme::HealthBarSystem::BORDER_THICKNESS = 1.0f

staticconstexprprivate

Thickness of the border around the bar.

Definition at line 85 of file HealthBarSystem.hpp.

◆ HEALTH_CRITICAL

eng::Color gme::HealthBarSystem::HEALTH_CRITICAL = {255, 0, 0, 255}

staticconstexprprivate

Red color for <25% health.

Definition at line 91 of file HealthBarSystem.hpp.

Referenced by getHealthColor().

◆ HEALTH_HIGH

eng::Color gme::HealthBarSystem::HEALTH_HIGH = {0, 255, 0, 255}

staticconstexprprivate

Green color for >75% health.

Definition at line 88 of file HealthBarSystem.hpp.

Referenced by getHealthColor().

◆ HEALTH_LOW

eng::Color gme::HealthBarSystem::HEALTH_LOW = {255, 100, 0, 255}

staticconstexprprivate

Orange color for 25-50% health.

Definition at line 90 of file HealthBarSystem.hpp.

Referenced by getHealthColor().

◆ HEALTH_MEDIUM

eng::Color gme::HealthBarSystem::HEALTH_MEDIUM = {255, 255, 0, 255}

staticconstexprprivate

Yellow color for 50-75% health.

Definition at line 89 of file HealthBarSystem.hpp.

Referenced by getHealthColor().

◆ m_renderer

const std::shared_ptr<eng::IRenderer>& gme::HealthBarSystem::m_renderer

private

Reference to the renderer for drawing.

Definition at line 79 of file HealthBarSystem.hpp.

Referenced by drawHealthBar().

The documentation for this class was generated from the following files:

/home/runner/work/R-Type/R-Type/plugins/Game/RType/Client/Multi/include/RTypeClientMulti/Systems/HealthBarSystem.hpp
/home/runner/work/R-Type/R-Type/plugins/Game/RType/Client/Multi/src/Systems/HealthBarSystem.cpp

Public Member Functions

Private Member Functions

Private Attributes

Static Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ HealthBarSystem() [1/3]

◆ ~HealthBarSystem()

◆ HealthBarSystem() [2/3]

◆ HealthBarSystem() [3/3]

Member Function Documentation

◆ drawHealthBar()

◆ getHealthColor()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ update()

Member Data Documentation

◆ BACKGROUND

◆ BAR_HEIGHT

◆ BAR_OFFSET_Y

◆ BAR_WIDTH

◆ BORDER

◆ BORDER_THICKNESS

◆ HEALTH_CRITICAL

◆ HEALTH_HIGH

◆ HEALTH_LOW

◆ HEALTH_MEDIUM

◆ m_renderer