1 files changed, 36 insertions, 0 deletions
diff --git a/prevnext1/slider.js b/prevnext1/slider.js
new file mode 100644
index 0000000..f3673c5
--- /dev/null
+++ b/prevnext1/slider.js
@@ -0,0 +1,36 @@
+( function() {
+
+function Slider() {
+  this.x = 0;
+  this.accel = 0;
+  this.velocity = 0;
+  this.friction = 0.25;
+}
+
+Slider.prototype.update = function() {
+  this.velocity += this.accel;
+  this.velocity *= ( 1 - this.friction );
+  this.x += this.velocity;
+  // reset acceleration
+  this.accel = 0;
+};
+
+Slider.prototype.applyForce = function( force ) {
+  this.accel += force;
+};
+
+Slider.prototype.getRestingPosition = function() {
+  // little simulation where thing will rest
+  var restingVelo = 0.07;
+  var velo = this.velocity;
+  var restX = this.x;
+  while ( Math.abs( velo ) > restingVelo ) {
+    velo *= 1 - this.friction;
+    restX += velo;
+  }
+  return restX;
+};
+
+window.Slider = Slider;
+
+})();