npm_modules: Fork bower_components into Polymer 0.4.0 and 0.5.0 versions

polymer_0.5.0/bower_components/web-animations-js/src/matrix-interpolation.js

+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+// limitations under the License.
+
+(function(scope, testing) {
+  var composeMatrix = (function() {
+    function multiply(a, b) {
+      var result = [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]];
+      for (var i = 0; i < 4; i++) {
+        for (var j = 0; j < 4; j++) {
+          for (var k = 0; k < 4; k++) {
+            result[i][j] += b[i][k] * a[k][j];
+          }
+        }
+      }
+      return result;
+    }
+
+    function is2D(m) {
+      return (
+          m[0][2] == 0 &&
+          m[0][3] == 0 &&
+          m[1][2] == 0 &&
+          m[1][3] == 0 &&
+          m[2][0] == 0 &&
+          m[2][1] == 0 &&
+          m[2][2] == 1 &&
+          m[2][3] == 0 &&
+          m[3][2] == 0 &&
+          m[3][3] == 1);
+    }
+
+    function composeMatrix(translate, scale, skew, quat, perspective) {
+      var matrix = [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]];
+
+      for (var i = 0; i < 4; i++) {
+        matrix[i][3] = perspective[i];
+      }
+
+      for (var i = 0; i < 3; i++) {
+        for (var j = 0; j < 3; j++) {
+          matrix[3][i] += translate[j] * matrix[j][i];
+        }
+      }
+
+      var x = quat[0], y = quat[1], z = quat[2], w = quat[3];
+
+      var rotMatrix = [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]];
+
+      rotMatrix[0][0] = 1 - 2 * (y * y + z * z);
+      rotMatrix[0][1] = 2 * (x * y - z * w);
+      rotMatrix[0][2] = 2 * (x * z + y * w);
+      rotMatrix[1][0] = 2 * (x * y + z * w);
+      rotMatrix[1][1] = 1 - 2 * (x * x + z * z);
+      rotMatrix[1][2] = 2 * (y * z - x * w);
+      rotMatrix[2][0] = 2 * (x * z - y * w);
+      rotMatrix[2][1] = 2 * (y * z + x * w);
+      rotMatrix[2][2] = 1 - 2 * (x * x + y * y);
+
+      matrix = multiply(matrix, rotMatrix);
+
+      var temp = [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]];
+      if (skew[2]) {
+        temp[2][1] = skew[2];
+        matrix = multiply(matrix, temp);
+      }
+
+      if (skew[1]) {
+        temp[2][1] = 0;
+        temp[2][0] = skew[0];
+        matrix = multiply(matrix, temp);
+      }
+
+      if (skew[0]) {
+        temp[2][0] = 0;
+        temp[1][0] = skew[0];
+        matrix = multiply(matrix, temp);
+      }
+
+      for (var i = 0; i < 3; i++) {
+        for (var j = 0; j < 3; j++) {
+          matrix[i][j] *= scale[i];
+        }
+      }
+
+      if (is2D(matrix)) {
+        return [matrix[0][0], matrix[0][1], matrix[1][0], matrix[1][1], matrix[3][0], matrix[3][1]];
+      }
+      return matrix[0].concat(matrix[1], matrix[2], matrix[3]);
+    }
+    return composeMatrix;
+  })();
+
+  function clamp(x, min, max) {
+    return Math.max(Math.min(x, max), min);
+  };
+
+  function quat(fromQ, toQ, f) {
+    var product = scope.dot(fromQ, toQ);
+    product = clamp(product, -1.0, 1.0);
+
+    var quat = [];
+    if (product === 1.0) {
+      quat = fromQ;
+    } else {
+      var theta = Math.acos(product);
+      var w = Math.sin(f * theta) * 1 / Math.sqrt(1 - product * product);
+
+      for (var i = 0; i < 4; i++) {
+        quat.push(fromQ[i] * (Math.cos(f * theta) - product * w) +
+                  toQ[i] * w);
+      }
+    }
+    return quat;
+  }
+
+  scope.composeMatrix = composeMatrix;
+  scope.quat = quat;
+
+})(webAnimationsMinifill, webAnimationsTesting);