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

3 files changed, 105 insertions, 0 deletions

diff --git a/lib/components/grab.js b/lib/components/grab.js
new file mode 100644
index 0000000..ab808a8
--- /dev/null
+++ b/lib/components/grab.js
@@ -0,0 +1,60 @@
+import { Component } from '@serpentity/serpentity';
+
+/**
+ * Component that stores a dash skill
+ *
+ * @extends {external:Serpentity.Component}
+ * @class GrabComponent
+ * @param {object} config a configuration object to extend.
+ */
+export default class GrabComponent extends Component {
+  constructor(config) {
+
+    super(config);
+
+    /**
+     * The properthy that holds the grab state
+     *
+     * @property {boolean} grabbing
+     * @instance
+     * @memberof GrabComponent
+     */
+    this.dashing = this.grabbing || false;
+
+    /**
+     * The constraint used for the grab
+     *
+     * @property {external:MatterJs.Constraint} constraint
+     * @instance
+     * @memberof GrabComponent
+     */
+    this.constraint = this.constraint || null;
+
+    /**
+     * Whether the grab is locked from occuring
+     *
+     * @property {boolean} locked
+     * @instance
+     * @memberof GrabComponent
+     */
+    this.locked = this.locked || false;
+
+    /**
+     * Cooldown before lock is removed
+     *
+     * @property {number} cooldown
+     * @instance
+     * @memberof GrabComponent
+     */
+    this.cooldown = this.cooldown || 3000;
+
+    /**
+     * Current cooldown
+     *
+     * @property {number} currentCooldown
+     * @instance
+     * @memberof GrabComponent
+     */
+    this.currentCooldown = 0;
+  }
+};
diff --git a/lib/components/grab_area.js b/lib/components/grab_area.js
new file mode 100644
index 0000000..3966c83
--- /dev/null
+++ b/lib/components/grab_area.js
@@ -0,0 +1,34 @@
+import { Component } from '@serpentity/serpentity';
+
+/**
+ * Component that stores an area used to grab things
+ *
+ * @extends {external:Serpentity.Component}
+ * @class GrabAreaComponent
+ * @param {object} config a configuration object to extend.
+ */
+export default class GrabAreaComponent extends Component {
+  constructor(config) {
+
+    super(config);
+
+    /**
+     * The properthy that holds the angle. Assumes the area behaves as a sensor
+     *
+     * @property {external:MatterJs.Body} area
+     * @instance
+     * @memberof GrabAreaComponent
+     */
+    this.area = this.area || null;
+
+    /**
+     * The constraint that ties this area to its parent
+     *
+     * @property {external:MatterJs.Constraint} constraint
+     * @instance
+     * @memberof GrabAreaComponent
+     */
+    this.constraint = this.constraint || null;
+  }
+};
+
diff --git a/lib/components/grabbable.js b/lib/components/grabbable.js
new file mode 100644
index 0000000..223b95c
--- /dev/null
+++ b/lib/components/grabbable.js
@@ -0,0 +1,11 @@
+import { Component } from '@serpentity/serpentity';
+
+/**
+ * Component that stores grab status
+ *
+ * @extends {external:Serpentity.Component}
+ * @class GrabbableComponent
+ * @param {object} config a configuration object to extend.
+ */
+export default class GrabbableComponent extends Component {};
+