Physics Engine (#4)

* Add matter-js as a dependency

* Add body component

* Fix renderable node doc

* Add the physics node type

* Correct typo in physics enabled node types

* Update docs on render system

* Add physics system

* Update changelog

* Add physics engine to main app

* Tweak the gravity of the world

* Add body to sumo factory

* Add angle component

* Add angle to entity

* Add angle to the nodes

* Pass angle between systems

* Set default angle to 0

* Split systems and nodes

* Fix indentaion in physics world control

* Add third sumo entity

* Adjust values for constriants and physics

* Correct docs in new nodes

* Update built-in docs

1 files changed, 30 insertions, 0 deletions

diff --git a/lib/nodes/renderable_with_attributes.js b/lib/nodes/renderable_with_attributes.js
new file mode 100644
index 0000000..817036c
--- /dev/null
+++ b/lib/nodes/renderable_with_attributes.js
@@ -0,0 +1,30 @@
+import { Node } from '@serpentity/serpentity';
+
+import AngleComponent from '../components/angle';
+import PixiContainerComponent from '../components/pixi_container';
+import PositionComponent from '@serpentity/components.position';
+
+/**
+ * Node identifying a renderable entity, should have position and a
+ * symbol to render
+ *
+ * @extends {external:Serpentity.Node}
+ * @class RenderableWithAttributesNode
+ */
+export default class RenderableWithAttributesNode extends Node {
+
+};
+
+/**
+ * Holds the types that are used to identify a renderable with external
+ * attributes
+ *
+ * @property {object} types
+ * @name types
+ * @memberof RenderableWithAttributesNode
+ */
+RenderableWithAttributesNode.types = {
+  angle: AngleComponent,
+  position: PositionComponent,
+  container: PixiContainerComponent
+};