entities.go

package main

import (
	"github.com/BigJk/ramen/concolor"
	"github.com/BigJk/ramen/console"
	"github.com/BigJk/ramen/t"
)

// Entity is a generic struct to represent players, enemies, items,etc.
type Entity struct {
	dungeon        *GameMap
	X              int
	Y              int
	Char           int
	Color          concolor.Color
	name           string
	blocksMovement bool
}

// Move the entity by a given amount.
func (entity *Entity) Move(dx, dy int) {
	entity.X += dx
	entity.Y += dy
}

// Spawn makes a copy of Entity and adds it to the GameMap's EntityList if not nil.
func (entity *Entity) Spawn(x, y int, dungeon *GameMap) *Entity {
	spawn := *entity
	spawn.X = x
	spawn.Y = y
	if dungeon != nil {
		spawn.dungeon = dungeon
		dungeon.entities.Add(&spawn)
	}
	return &spawn
}

// Place moves the Entity to a new location, handles moving across GameMap's, e.g. moving Player between levels
func (entity *Entity) Place(x, y int, dungeon *GameMap) {
	entity.X = x
	entity.Y = y
	if dungeon != nil {
		if entity.dungeon != nil {
			entity.dungeon.entities.Remove(entity)
		}
		entity.dungeon = dungeon
		dungeon.entities.Add(entity)
	}
}

// EntityList is a collection of Entity and provides helper methods
type EntityList struct {
	Entities []*Entity
}

// Add adds a new Entity to EntityList
func (list *EntityList) Add(entity *Entity) {
	list.Entities = append(list.Entities, entity)
}

func (list *EntityList) Remove(entity *Entity) {
	// TODO remove entity from list.Entities
}

// Render loops through all Entity in the EntityList and draws them to the console
func (list *EntityList) Render(dungeon *GameMap, con *console.Console) {
	for _, entity := range list.Entities {
		if dungeon.fov.IsVisible(entity.X, entity.Y) {
			// Only print entities that are in the FOV
			con.Transform(entity.X, entity.Y, t.Foreground(entity.Color), t.Char(entity.Char))
		}
	}
}

// AtLocation returns the first Entity found at location.
func (list *EntityList) AtLocation(x, y int) *Entity {
	for _, entity := range list.Entities {
		if entity.X == x && entity.Y == y {
			return entity
		}
	}

	return nil
}

// NewEntity returns a new Entity pointer
func NewEntity(char rune, color concolor.Color, name string, blocksMovement bool) *Entity {
	return &Entity{
		Char:           int(char),
		Color:          color,
		name:           name,
		blocksMovement: blocksMovement,
	}
}

// Definitions for various Entities to be spawned into the GameMap

var Player = NewEntity('@', concolor.RGB(255, 255, 255), "Player", true)
var Orc = NewEntity('o', concolor.RGB(63, 127, 63), "Orc", true)
var Troll = NewEntity('T', concolor.RGB(0, 127, 0), "Troll", true)