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Diffstat (limited to 'catapult/third_party/polymer/components/web-animations-js/src/matrix-interpolation.js')
-rw-r--r-- | catapult/third_party/polymer/components/web-animations-js/src/matrix-interpolation.js | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/catapult/third_party/polymer/components/web-animations-js/src/matrix-interpolation.js b/catapult/third_party/polymer/components/web-animations-js/src/matrix-interpolation.js new file mode 100644 index 00000000..9a35de3b --- /dev/null +++ b/catapult/third_party/polymer/components/web-animations-js/src/matrix-interpolation.js @@ -0,0 +1,130 @@ +// 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); |