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123 lines
3.7 KiB
JavaScript
123 lines
3.7 KiB
JavaScript
/*
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* OpenSeadragon - Mat3
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*
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* Modified from https://webglfundamentals.org/webgl/lessons/webgl-2d-matrices.html
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* Copyright (C) 2010-2023 webglfundamentals.org and OpenSeadragon contributors
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of CodePlex Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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(function( $ ){
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/**
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* Matrix left-to-right system representation
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*/
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$.Mat3 = class Mat3 {
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constructor(values){
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if(!values) {
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values = [
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0, 0, 0,
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0, 0, 0,
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0, 0, 0
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];
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}
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this.values = values;
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}
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static makeIdentity(){
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return new Mat3([
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1, 0, 0,
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0, 1, 0,
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0, 0, 1
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]);
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}
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static makeTranslation(tx, ty) {
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return new Mat3([
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1, 0, 0,
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0, 1, 0,
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tx, ty, 1,
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]);
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}
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static makeRotation(angleInRadians) {
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var c = Math.cos(angleInRadians);
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var s = Math.sin(angleInRadians);
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return new Mat3([
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c, -s, 0,
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s, c, 0,
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0, 0, 1,
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]);
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}
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static makeScaling(sx, sy) {
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return new Mat3([
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sx, 0, 0,
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0, sy, 0,
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0, 0, 1,
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]);
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}
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multiply(other) {
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let a = this.values;
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let b = other.values;
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var a00 = a[0 * 3 + 0];
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var a01 = a[0 * 3 + 1];
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var a02 = a[0 * 3 + 2];
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var a10 = a[1 * 3 + 0];
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var a11 = a[1 * 3 + 1];
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var a12 = a[1 * 3 + 2];
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var a20 = a[2 * 3 + 0];
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var a21 = a[2 * 3 + 1];
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var a22 = a[2 * 3 + 2];
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var b00 = b[0 * 3 + 0];
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var b01 = b[0 * 3 + 1];
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var b02 = b[0 * 3 + 2];
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var b10 = b[1 * 3 + 0];
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var b11 = b[1 * 3 + 1];
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var b12 = b[1 * 3 + 2];
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var b20 = b[2 * 3 + 0];
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var b21 = b[2 * 3 + 1];
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var b22 = b[2 * 3 + 2];
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return new Mat3([
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b00 * a00 + b01 * a10 + b02 * a20,
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b00 * a01 + b01 * a11 + b02 * a21,
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b00 * a02 + b01 * a12 + b02 * a22,
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b10 * a00 + b11 * a10 + b12 * a20,
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b10 * a01 + b11 * a11 + b12 * a21,
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b10 * a02 + b11 * a12 + b12 * a22,
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b20 * a00 + b21 * a10 + b22 * a20,
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b20 * a01 + b21 * a11 + b22 * a21,
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b20 * a02 + b21 * a12 + b22 * a22,
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]);
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}
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};
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}( OpenSeadragon ));
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