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node_modules/phaser/plugins/impact/UpdateMotion.js

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+/**
+ * @author       Richard Davey <rich@photonstorm.com>
+ * @copyright    2020 Photon Storm Ltd.
+ * @license      {@link https://opensource.org/licenses/MIT|MIT License}
+ */
+
+/**
+ * Set up the trace-result
+ * var res = {
+ *     collision: {x: false, y: false, slope: false},
+ *     pos: {x: x, y: y},
+ *     tile: {x: 0, y: 0}
+ * };
+ *
+ * @function Phaser.Physics.Impact.UpdateMotion
+ * @since 3.0.0
+ *
+ * @param {Phaser.Physics.Impact.Body} body - [description]
+ * @param {object} res - [description]
+ */
+var UpdateMotion = function (body, res)
+{
+    body.standing = false;
+
+    //  Y
+    if (res.collision.y)
+    {
+        if (body.bounciness > 0 && Math.abs(body.vel.y) > body.minBounceVelocity)
+        {
+            body.vel.y *= -body.bounciness;
+        }
+        else
+        {
+            if (body.vel.y > 0)
+            {
+                body.standing = true;
+            }
+
+            body.vel.y = 0;
+        }
+    }
+
+    //  X
+    if (res.collision.x)
+    {
+        if (body.bounciness > 0 && Math.abs(body.vel.x) > body.minBounceVelocity)
+        {
+            body.vel.x *= -body.bounciness;
+        }
+        else
+        {
+            body.vel.x = 0;
+        }
+    }
+
+    //  SLOPE
+    if (res.collision.slope)
+    {
+        var s = res.collision.slope;
+       
+        if (body.bounciness > 0)
+        {
+            var proj = body.vel.x * s.nx + body.vel.y * s.ny;
+
+            body.vel.x = (body.vel.x - s.nx * proj * 2) * body.bounciness;
+            body.vel.y = (body.vel.y - s.ny * proj * 2) * body.bounciness;
+        }
+        else
+        {
+            var lengthSquared = s.x * s.x + s.y * s.y;
+            var dot = (body.vel.x * s.x + body.vel.y * s.y) / lengthSquared;
+            
+            body.vel.x = s.x * dot;
+            body.vel.y = s.y * dot;
+            
+            var angle = Math.atan2(s.x, s.y);
+
+            if (angle > body.slopeStanding.min && angle < body.slopeStanding.max)
+            {
+                body.standing = true;
+            }
+        }
+    }
+
+    body.pos.x = res.pos.x;
+    body.pos.y = res.pos.y;
+};
+
+module.exports = UpdateMotion;