1 files changed, 45 insertions, 0 deletions
diff --git a/bounds3/slider.js b/bounds3/slider.js
new file mode 100644
index 0000000..e245071
--- /dev/null
+++ b/bounds3/slider.js
@@ -0,0 +1,45 @@
+( function() {
+
+function Slider( x, y ) {
+  this.x = x;
+  this.y = y;
+  this.velocity = 0;
+  this.accel = 0;
+  this.friction = 0.15;
+}
+
+Slider.prototype.update = function() {
+  this.velocity += this.accel;
+  this.velocity *= ( 1 - this.friction );
+  this.x += this.velocity;
+  this.accel = 0;
+};
+
+Slider.prototype.applyForce = function( force ) {
+  this.accel += force;
+};
+
+
+Slider.prototype.getRestingPosition = function() {
+
+  var fFriction = 1 - this.friction;
+  var restingVelo = 0.07;
+  var ticks = getBaseLog( fFriction, restingVelo / Math.abs( this.velocity ) );
+  var frictionSum = ( Math.pow( fFriction, ticks + 1 ) - 1 ) / ( fFriction - 1 );
+  var restX = this.x + this.velocity * fFriction * frictionSum;
+
+  return {
+    x: restX,
+    frictionSum: frictionSum
+  };
+};
+
+
+function getBaseLog( a, b ) {
+  return Math.log( b ) / Math.log( a );
+}
+
+
+window.Slider = Slider;
+
+})();