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https://github.com/OpenDiablo2/OpenDiablo2
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c52c6648dd
Systems now place all of their component factories into a `Components` member. This improves code readability and makes it clear when we are dealing specifically with ecs components. The concrete ComponentFactory instances now have `Add` and `Get` methods (as opposed to `AddAlpha` or `GetAlpha`). This enforces naming of component factories as to avoid collisions when embedded in a struct with other components. Also, the ComponentFactory interface is embedded directly into the concrete component factory without a name.
56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
//nolint:dupl,golint,stylecheck // component declarations are supposed to look the same
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package d2components
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import (
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"github.com/gravestench/akara"
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"github.com/OpenDiablo2/OpenDiablo2/d2common/d2geom"
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)
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// static check that Viewport implements Component
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var _ akara.Component = &Viewport{}
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// Viewport represents the size and position of a scene viewport. This is used
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// to control where on screen a viewport is rendered.
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type Viewport struct {
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*d2geom.Rectangle
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}
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// New creates a new Viewport. By default, the viewport size is 800x600,
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// and is positioned at the top-left of the screen.
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func (*Viewport) New() akara.Component {
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c := &Viewport{}
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const defaultWidth, defaultHeight = 800, 600
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c.Rectangle = &d2geom.Rectangle{
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Left: 0,
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Top: 0,
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Width: defaultWidth,
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Height: defaultHeight,
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}
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return c
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}
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// ViewportFactory is a wrapper for the generic component factory that returns Viewport component instances.
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// This can be embedded inside of a system to give them the methods for adding, retrieving, and removing a Viewport.
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type ViewportFactory struct {
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*akara.ComponentFactory
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}
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// Add adds a Viewport component to the given entity and returns it
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func (m *ViewportFactory) Add(id akara.EID) *Viewport {
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return m.ComponentFactory.Add(id).(*Viewport)
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}
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// Get returns the Viewport component for the given entity, and a bool for whether or not it exists
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func (m *ViewportFactory) Get(id akara.EID) (*Viewport, bool) {
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component, found := m.ComponentFactory.Get(id)
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if !found {
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return nil, found
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}
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return component.(*Viewport), found
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}
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