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+// 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;
+
+})(webAnimations1, webAnimationsTesting);