mirror of
https://github.com/OpenDiablo2/OpenDiablo2
synced 2025-02-13 12:06:31 -05:00
102 lines
2.9 KiB
Go
102 lines
2.9 KiB
Go
package d2components
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import (
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"github.com/gravestench/akara"
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)
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// static check that OriginComponent implements Component
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var _ akara.Component = &OriginComponent{}
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// static check that OriginMap implements ComponentMap
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var _ akara.ComponentMap = &OriginMap{}
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// OriginComponent is a component that describes the origin point of an entity.
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// The values are normalized to the display width/height.
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// For example, origin (0,0) is top-left corner, (0.5, 0.5) is center
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type OriginComponent struct {
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X, Y float64 // normalized
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}
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// ID returns a unique identifier for the component type
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func (*OriginComponent) ID() akara.ComponentID {
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return OriginCID
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}
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// NewMap returns a new component map for the component type
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func (*OriginComponent) NewMap() akara.ComponentMap {
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return NewOriginMap()
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}
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// Origin is a convenient reference to be used as a component identifier
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var Origin = (*OriginComponent)(nil) // nolint:gochecknoglobals // global by design
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// NewOriginMap creates a new map of entity ID's to Origin
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func NewOriginMap() *OriginMap {
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cm := &OriginMap{
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components: make(map[akara.EID]*OriginComponent),
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}
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return cm
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}
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// OriginMap is a map of entity ID's to Origin
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type OriginMap struct {
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world *akara.World
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components map[akara.EID]*OriginComponent
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}
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// Init initializes the component map with the given world
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func (cm *OriginMap) Init(world *akara.World) {
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cm.world = world
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}
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// ID returns a unique identifier for the component type
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func (*OriginMap) ID() akara.ComponentID {
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return OriginCID
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}
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// NewMap returns a new component map for the component type
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func (*OriginMap) NewMap() akara.ComponentMap {
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return NewOriginMap()
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}
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// Add a new OriginComponent for the given entity id, return that component.
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// If the entity already has a component, just return that one.
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func (cm *OriginMap) Add(id akara.EID) akara.Component {
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if com, has := cm.components[id]; has {
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return com
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}
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cm.components[id] = &OriginComponent{}
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cm.world.UpdateEntity(id)
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return cm.components[id]
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}
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// AddOrigin adds a new OriginComponent for the given entity id and returns it.
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// If the entity already has a file type component, just return that one.
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// this is a convenience method for the generic Add method, as it returns a
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// *OriginComponent instead of an akara.Component
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func (cm *OriginMap) AddOrigin(id akara.EID) *OriginComponent {
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return cm.Add(id).(*OriginComponent)
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}
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// Get returns the component associated with the given entity id
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func (cm *OriginMap) Get(id akara.EID) (akara.Component, bool) {
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entry, found := cm.components[id]
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return entry, found
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}
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// GetOrigin returns the OriginComponent associated with the given entity id
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func (cm *OriginMap) GetOrigin(id akara.EID) (*OriginComponent, bool) {
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entry, found := cm.components[id]
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return entry, found
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}
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// Remove a component for the given entity id, return the component.
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func (cm *OriginMap) Remove(id akara.EID) {
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delete(cm.components, id)
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cm.world.UpdateEntity(id)
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}
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