Quad easing functions

compiled/radium.js

@@ -690,6 +690,9 @@
       this.invert_repeat = invert_repeat;
       this.next = next;
       this.params = params;
+      this.quadInOut = __bind(this.quadInOut, this);
+      this.quadOut = __bind(this.quadOut, this);
+      this.quadIn = __bind(this.quadIn, this);
       this.linearNone = __bind(this.linearNone, this);
       this.expoInOut = __bind(this.expoInOut, this);
       this.expoOut = __bind(this.expoOut, this);
@@ -916,6 +919,26 @@
       return this.change * time / this.duration + this.start;
     };
 
+    Ease.prototype.quadIn = function(time) {
+      time = time / this.duration;
+      return this.change * time * time + this.start;
+    };
+
+    Ease.prototype.quadOut = function(time) {
+      time = time / this.duration;
+      return -this.change * time * (time - 2) + this.start;
+    };
+
+    Ease.prototype.quadInOut = function(time) {
+      time = time / (this.duration / 2);
+      if (time < 1) {
+        return this.change / 2 * time * time + this.start;
+      } else {
+        time = time - 1;
+        return -this.change / 2 * (time * (time - 2) - 1) + this.start;
+      }
+    };
+
     return Ease;
 
   })();

radium/engine.ease.coffee

@@ -257,3 +257,19 @@ class Ease
 	linearNone: (time) =>
 		return @change * time / @duration + @start
 
+	quadIn: (time) =>
+		time = time / @duration
+		return @change * time * time + @start
+
+	quadOut: (time) =>
+		time = time / @duration
+		return -@change * time * (time - 2) + @start
+
+	quadInOut: (time) =>
+		time = time / (@duration / 2)
+
+		if time < 1
+			return @change / 2 * time * time + @start
+		else
+			time = time - 1
+			return -@change / 2 * (time * (time - 2) - 1) + @start