mirror of
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131 lines
3.7 KiB
JavaScript
131 lines
3.7 KiB
JavaScript
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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(function(scope, testing) {
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var composeMatrix = (function() {
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function multiply(a, b) {
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var result = [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]];
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for (var i = 0; i < 4; i++) {
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for (var j = 0; j < 4; j++) {
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for (var k = 0; k < 4; k++) {
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result[i][j] += b[i][k] * a[k][j];
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}
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}
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}
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return result;
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}
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function is2D(m) {
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return (
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m[0][2] == 0 &&
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m[0][3] == 0 &&
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m[1][2] == 0 &&
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m[1][3] == 0 &&
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m[2][0] == 0 &&
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m[2][1] == 0 &&
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m[2][2] == 1 &&
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m[2][3] == 0 &&
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m[3][2] == 0 &&
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m[3][3] == 1);
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}
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function composeMatrix(translate, scale, skew, quat, perspective) {
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var matrix = [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]];
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for (var i = 0; i < 4; i++) {
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matrix[i][3] = perspective[i];
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}
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for (var i = 0; i < 3; i++) {
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for (var j = 0; j < 3; j++) {
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matrix[3][i] += translate[j] * matrix[j][i];
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}
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}
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var x = quat[0], y = quat[1], z = quat[2], w = quat[3];
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var rotMatrix = [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]];
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rotMatrix[0][0] = 1 - 2 * (y * y + z * z);
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rotMatrix[0][1] = 2 * (x * y - z * w);
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rotMatrix[0][2] = 2 * (x * z + y * w);
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rotMatrix[1][0] = 2 * (x * y + z * w);
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rotMatrix[1][1] = 1 - 2 * (x * x + z * z);
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rotMatrix[1][2] = 2 * (y * z - x * w);
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rotMatrix[2][0] = 2 * (x * z - y * w);
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rotMatrix[2][1] = 2 * (y * z + x * w);
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rotMatrix[2][2] = 1 - 2 * (x * x + y * y);
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matrix = multiply(matrix, rotMatrix);
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var temp = [[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]];
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if (skew[2]) {
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temp[2][1] = skew[2];
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matrix = multiply(matrix, temp);
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}
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if (skew[1]) {
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temp[2][1] = 0;
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temp[2][0] = skew[0];
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matrix = multiply(matrix, temp);
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}
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if (skew[0]) {
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temp[2][0] = 0;
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temp[1][0] = skew[0];
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matrix = multiply(matrix, temp);
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}
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for (var i = 0; i < 3; i++) {
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for (var j = 0; j < 3; j++) {
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matrix[i][j] *= scale[i];
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}
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}
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if (is2D(matrix)) {
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return [matrix[0][0], matrix[0][1], matrix[1][0], matrix[1][1], matrix[3][0], matrix[3][1]];
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}
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return matrix[0].concat(matrix[1], matrix[2], matrix[3]);
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}
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return composeMatrix;
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})();
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function clamp(x, min, max) {
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return Math.max(Math.min(x, max), min);
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};
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function quat(fromQ, toQ, f) {
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var product = scope.dot(fromQ, toQ);
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product = clamp(product, -1.0, 1.0);
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var quat = [];
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if (product === 1.0) {
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quat = fromQ;
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} else {
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var theta = Math.acos(product);
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var w = Math.sin(f * theta) * 1 / Math.sqrt(1 - product * product);
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for (var i = 0; i < 4; i++) {
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quat.push(fromQ[i] * (Math.cos(f * theta) - product * w) +
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toQ[i] * w);
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}
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}
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return quat;
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}
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scope.composeMatrix = composeMatrix;
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scope.quat = quat;
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})(webAnimations1, webAnimationsTesting);
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