Add Grab System (#9)

* Remove unused code

* Adds grab components

* Adds grab nodes

* Add sensors to the physics world

* Add grab systems

* Add new sprites

* Attach grab components

* Add grab system to engine

* Update changelog

4 files changed, 108 insertions, 0 deletions

diff --git a/lib/nodes/drawn_grabber.js b/lib/nodes/drawn_grabber.js
new file mode 100644
index 0000000..49af6d4
--- /dev/null
+++ b/lib/nodes/drawn_grabber.js
@@ -0,0 +1,27 @@
+import { Node } from '@serpentity/serpentity';
+
+import GrabComponent from '../components/grab';
+import PixiContainerComponent from '../components/pixi_container';
+
+/**
+ * Node identifying an entity that can grab and is drawn
+ *
+ * @extends {external:Serpentity.Node}
+ * @class DrawnGrabberNode
+ */
+export default class DrawnGrabberNode extends Node {
+
+};
+
+/**
+ * Holds the types that are used to identify a drawn grabber entity
+ *
+ * @property {object} types
+ * @name types
+ * @memberof DrawnGrabberNode
+ */
+DrawnGrabberNode.types = {
+  container: PixiContainerComponent,
+  grab: GrabComponent
+};
+
diff --git a/lib/nodes/grab_area.js b/lib/nodes/grab_area.js
new file mode 100644
index 0000000..9f6c3e0
--- /dev/null
+++ b/lib/nodes/grab_area.js
@@ -0,0 +1,25 @@
+import { Node } from '@serpentity/serpentity';
+
+import GrabAreaComponent from '../components/grab_area';
+
+/**
+ * Node identifying an entity that have a physical grab area
+ *
+ * @extends {external:Serpentity.Node}
+ * @class GrabAreaNode
+ */
+export default class GrabAreaNode extends Node {
+
+};
+
+/**
+ * Holds the types that are used to identify an entity with a grab
+ * area
+ *
+ * @property {object} types
+ * @name types
+ * @memberof GrabAreaNode
+ */
+GrabAreaNode.types = {
+  grabArea: GrabAreaComponent
+};
diff --git a/lib/nodes/grabbable.js b/lib/nodes/grabbable.js
new file mode 100644
index 0000000..4711764
--- /dev/null
+++ b/lib/nodes/grabbable.js
@@ -0,0 +1,27 @@
+import { Node } from '@serpentity/serpentity';
+
+import BodyComponent from '../components/body';
+import GrabbableComponent from '../components/grabbable';
+
+/**
+ * Node identifying an entity that can grab another
+ *
+ * @extends {external:Serpentity.Node}
+ * @class GrabbableNode
+ */
+export default class GrabbableNode extends Node {
+
+};
+
+/**
+ * Holds the types that are used to identify a grabbable entity
+ *
+ * @property {object} types
+ * @name types
+ * @memberof GrabbableNode
+ */
+GrabbableNode.types = {
+  body: BodyComponent,
+  grabbable: GrabbableComponent
+};
+
diff --git a/lib/nodes/grabber.js b/lib/nodes/grabber.js
new file mode 100644
index 0000000..db61365
--- /dev/null
+++ b/lib/nodes/grabber.js
@@ -0,0 +1,29 @@
+import { Node } from '@serpentity/serpentity';
+
+import BodyComponent from '../components/body';
+import GrabAreaComponent from '../components/grab_area';
+import GrabComponent from '../components/grab';
+
+/**
+ * Node identifying an entity that can grab another
+ *
+ * @extends {external:Serpentity.Node}
+ * @class GrabberNode
+ */
+export default class GrabberNode extends Node {
+
+};
+
+/**
+ * Holds the types that are used to identify a grabber entity
+ *
+ * @property {object} types
+ * @name types
+ * @memberof GrabberNode
+ */
+GrabberNode.types = {
+  body: BodyComponent,
+  grabArea: GrabAreaComponent,
+  grab: GrabComponent
+};
+