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/*
* Copyright 2014, Gregg Tavares.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Gregg Tavares. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* global define */
(function(root, factory) { // eslint-disable-line
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['./transform'], factory);
} else {
// Browser globals
const lib = factory();
root.wrapCanvasRenderingContext2D = lib.wrap;
}
}(this, function() {
'use strict'; // eslint-disable-line
function duplicate(src) {
const d = new window.DOMMatrix();
d.a = src.a;
d.b = src.b;
d.c = src.c;
d.d = src.d;
d.e = src.e;
d.f = src.f;
return d;
}
function patchCurrentTransform(ctx) {
if (ctx.currentTransform) {
return ctx;
}
const stack = [];
ctx.scale = function(scale) {
return function(x, y) {
ctx.currentTransform.scaleSelf(x, y);
scale(x, y);
};
}(ctx.scale.bind(ctx));
ctx.rotate = function(rotate) {
return function(r) {
ctx.currentTransform.rotateSelf(r * 180 / Math.PI);
rotate(r);
};
}(ctx.rotate.bind(ctx));
ctx.translate = function(translate) {
return function(x, y) {
ctx.currentTransform.translateSelf(x, y);
translate(x, y);
};
}(ctx.translate.bind(ctx));
ctx.save = function(save) {
return function() {
stack.push(duplicate(ctx.currentTransform));
save();
};
}(ctx.save.bind(ctx));
ctx.restore = function(restore) {
return function() {
if (stack.length) {
ctx.currentTransform = stack.pop();
} else {
throw new Error('"transform stack empty!');
}
restore();
};
}(ctx.restore.bind(ctx));
ctx.transform = function(transform) {
return function(m11, m12, m21, m22, dx, dy) {
const m = new DOMMatrix();
m.a = m11;
m.b = m12;
m.c = m21;
m.d = m22;
m.e = dx;
m.f = dy;
ctx.currentTransform.multiplySelf(m);
transform(m11, m12, m21, m22, dx, dy);
};
}(ctx.transform.bind(ctx));
ctx.setTransform = function(setTransform) {
return function(m11, m12, m21, m22, dx, dy) {
const d = ctx.currentTransform;
d.a = m11;
d.b = m12;
d.c = m21;
d.d = m22;
d.e = dx;
d.f = dy;
setTransform(m11, m12, m21, m22, dx, dy);
};
}(ctx.setTransform.bind(ctx));
ctx.currentTransform = new DOMMatrix();
ctx.validateTransformStack = function() {
if (stack.length !== 0) {
throw new Error('transform stack not 0');
}
};
return ctx;
}
function wrap(ctx) {
//patchDOMMatrix();
return patchCurrentTransform(ctx);
}
return {
wrap: wrap,
};
}));