Targeting System

The targeting system allows players to select targets for spells, abilities, and other effects.

Core Concepts

The targeting system consists of:

• Target Sources: Cards or abilities that require targets
• Target Validators: Rules that determine valid targets
• Target Selectors: UI elements that allow players to select targets
• Visual Feedback: Effects that show targeting in progress

Targeting Flow

1. Player initiates targeting (by playing a card or activating an ability)
2. System highlights valid targets based on game rules
3. Player selects target(s)
4. System validates the selection
5. Action completes with chosen targets

Component Structure

#![allow(unused)]
fn main() {
pub struct TargetSource {
    pub targeting_active: bool,
    pub required_targets: usize,
    pub current_targets: Vec<Entity>,
    pub target_rules: TargetRules,
}

pub struct Targetable {
    pub can_be_targeted: bool,
    pub highlight_color: Color,
}
}

Visual Effects

The targeting system provides several visual cues:

• Highlighting valid targets
• Animated arcs or arrows from source to target
• Pulsing effects on potential targets
• Confirmation animations when targets are selected

Integration

The targeting system integrates with:

• Card Selection: Selected cards can be used as targets
• Drag and Drop: Dragging can initiate targeting
• Game Rules: Rules determine valid targets

Implementation Example

#![allow(unused)]
fn main() {
// Create a spell that requires targeting
commands.spawn((
    card_bundle,
    TargetSource {
        targeting_active: false,
        required_targets: 1,
        current_targets: Vec::new(),
        target_rules: TargetRules::CreaturesOnly,
    },
));

// Make a creature targetable
commands.spawn((
    creature_bundle,
    Targetable {
        can_be_targeted: true,
        highlight_color: Color::rgb(0.9, 0.3, 0.3),
    },
));
}

For more details on targeting rules, see the Magic rules on targeting.