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cink-renderer.js
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cink-renderer.js
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/**
* @preserve
* CInk
* Version: 2.0
* GPL v3 License
* Author: AppleGrew
* Website: http://cink.applegrew.com
* License Details:-
* CInk - Pure Javascript CFDG renderer.
* Copyright (C) 2011 Nirupam Biswas
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
(function (jQ) {
//==============
//Util Functions
//==============
function isNotDefined(v) {
return v === null || typeof v === 'undefined';
}
function d2r(d) { return d * (Math.PI / 180); }
function sqr(n) { return n * n; }
// 3x3 Matrix. This is the identity affine transformation.
function IDENTITY_TRANSFORM() {
return [ [1, 0, 0],
[0, 1, 0],
[0, 0, 1] ];
}
// 3x1 Matrix. This is the identity affine transformation.
function IDENTITY_TRANSFORM3x1() {
return [ [0],
[0],
[1] ];
}
function toAffineTransformation(a, b, x, c, d, y) {
return [[a, b, x],
[c, d, y],
[0, 0, 1]];
}
// Composes two transformations (i.e., by multiplying them).
function compose(m1, m2) {
var result = IDENTITY_TRANSFORM(), M, N, x, y, z, sum;
M = m1.length;
N = m2[0].length;
if (N === 1) {
result = IDENTITY_TRANSFORM3x1();
}
for (x = 0; x < M; x += 1) {
for (y = 0; y < N; y += 1) {
sum = 0;
for (z = 0; z < M; z += 1) { //Assuming m1 is MxM and m2 is MxN
sum += m1[x][z] * m2[z][y];
}
result[x][y] = sum;
}
}
return result; //This will have MxN dimension.
}
//Comapres two matrices and returns true if they have
//same value. decimalFactor is the number of decimals
//to consider for comparing float values. So, a value
//of 2 will consider 2 decimal places.
function areSameMat(mat1, mat2, decimalFactor) {
var i, j;
decimalFactor = decimalFactor * 10;
for (i = 0; i < mat1.length; i += 1) {
for (j = 0; j < mat1.length; j += 1) {
if (Math.round(mat1[i][j] * decimalFactor) !== Math.round(mat2[i][j] * decimalFactor)) {
return false;
}
}
}
return true;
}
// hue, saturation, brightness, alpha
// hue: [0,360)
// saturation: [0,1]
// brightness: [0,1]
// alpha: [0,1]
function hsv2rgb(h, s, v, a) {
//
// based on C code from http://paulbourke.net/texture_colour/convert/
//
var sat = {}, r, g, b, c;
while (h < 0) {
h += 360;
}
while (h > 360) {
h -= 360;
}
if (h < 120) {
sat.r = (120 - h) / 60.0;
sat.g = h / 60.0;
sat.b = 0;
} else if (h < 240) {
sat.r = 0;
sat.g = (240 - h) / 60.0;
sat.b = (h - 120) / 60.0;
} else {
sat.r = (h - 240) / 60.0;
sat.g = 0;
sat.b = (360 - h) / 60.0;
}
sat.r = Math.min(sat.r, 1);
sat.g = Math.min(sat.g, 1);
sat.b = Math.min(sat.b, 1);
v *= 255; // To scale r,g,b from range [0,1] to [0, 255].
r = Math.ceil((1 - s + s * sat.r) * v);
g = Math.ceil((1 - s + s * sat.g) * v);
b = Math.ceil((1 - s + s * sat.b) * v);
//Appending this way is less memory intensive. Ref: http://dev.opera.com/articles/view/efficient-javascript/?page=2
c = 'rgba(';
c += r;
c += ',';
c += g;
c += ',';
c += b;
c += ',';
c += a;
c += ')';
return c;
}
function colorToRgba(color) {
return hsv2rgb(color.h, color.s, color.b, color.a);
}
function getSafeVal(val, defaultVal) {
if (isNotDefined(val)) {
return defaultVal;
}
return val;
}
function mapLen(map) {
if (isNotDefined(map)) {
return 0;
}
if (typeof map.__count__ !== 'undefined') {
return map.__count__;
}
var s = 0, k;
for (k in map) {
if (map.hasOwnProperty(k)) {
s += 1;
}
}
return s;
}
function callbackWithErr(callbackFunc, err) {
if (!isNotDefined(callbackFunc)) {
setTimeout(function () { callbackFunc(false, err); }, 500);
}
}
function num2variantName(num) {
num = Math.floor(num % 1000000 + num / 1000000);
var result = "", remainder;
do {
remainder = num % 26;
result = String.fromCharCode(remainder + 65) + result;
num = Math.round(num / 26 - 0.5);
} while (num > 0);
return result;
}
function createCloneCanvas(canvas, z) {
var jC = jQ(canvas), newCanvas;
newCanvas = jQ('<canvas>').attr('height', jC.attr('height')).attr('width', jC.attr('width'));
newCanvas.css({
'z-index': z,
position: 'absolute',
margin: 0,
border: 0,
top: jC.offset().top + (jC.outerHeight(true) - jC.innerHeight()),
left: jC.offset().left + (jC.outerWidth(true) - jC.innerWidth())
});
newCanvas.appendTo(jC.parent());
return newCanvas.get(0);
}
function clone(obj) {
if (obj === null) {
return null;
}
var o, k;
if (obj instanceof Array) {
o = [];
for (k = 0; k < obj.length; k += 1) {
if (typeof obj[k] === 'object') {
o.push(clone(obj[k]));
} else {
o.push(obj[k]);
}
}
} else {
o = {};
for (k in obj) {
if (obj.hasOwnProperty(k)) {
if (typeof obj[k] === 'object') {
o[k] = clone(obj[k]);
} else {
o[k] = obj[k];
}
}
}
}
return o;
}
function invert3x3Matrix(mat) {
var a, b, c, d, e, f, g, h, k, A, B, C, det;
a = mat[0][0]; b = mat[0][1]; c = mat[0][2];
d = mat[1][0]; e = mat[1][1]; f = mat[1][2];
g = mat[2][0]; h = mat[2][1]; k = mat[2][2];
A = e * k - f * h; B = f * g - k * d; C = d * h - e * g;
det = a * A + b * B + c * C;
if (det === 0) {
return null;
}
return [[A / det, (c * h - b * k) / det, (b * f - c * e) / det],
[B / det, (a * k - c * g) / det, (c * d - a * f) / det],
[C / det, (g * b - a * h) / det, (a * e - b * d) / det]];
}
//Counter-clockwise rotation
function rotate(ang, transform) {
var cosTheta, sinTheta, r;
if (ang === 'pi') {
cosTheta = -1;
sinTheta = 0;
} else if (ang === 'pi/2') {
cosTheta = 0;
sinTheta = 1;
} else if (ang === 0) {
cosTheta = 1;
sinTheta = 0;
} else {
cosTheta = Math.cos(ang);
sinTheta = Math.sin(ang);
}
r = toAffineTransformation(cosTheta, -sinTheta, 0,
sinTheta, cosTheta, 0);
return compose(r, transform);
}
function scale(sx, sy, transform) {
var s = toAffineTransformation(sx, 0, 0,
0, sy, 0);
return compose(s, transform);
}
function translate(x, y, transform) {
var t = toAffineTransformation(1, 0, x,
0, 1, y);
return compose(t, transform);
}
function sq(n) {
return n * n;
}
function norm(r1, r2) {
return Math.sqrt(sq(r2[0][0] - r1[0][0]) + sq(r2[1][0] - r1[1][0]));
}
function sortedAscPush(arr, v, k, isFCFS) {//We could have used sort() after push() but that would be at best O(N lnN). This is O(N).
k = k || null;
isFCFS = isFCFS || false; //If arr already contains elements == v and this flag is false then v will be added at the end of the equal elements, else at front.
if (arr.length === 0) {
arr.push(v);
return;
}
var i, j;
for (i = 0; i < arr.length; i += 1) {
if (!isFCFS) {
if ((k === null && arr[i] === v) ||
(k !== null && arr[i][k] === v[k])) {
break;
}
}
if ((k === null && arr[i] > v) ||
(k !== null && arr[i][k] > v[k])) {
break;
}
}
for (j = arr.length; j > i; j -= 1) {
arr[j] = arr[j - 1];
}
arr[i] = v;
}
//================
//Global Functions
//================
var CInk = window.CInk, UNICODE_PATTERN = /\{u([0-9]+)\}/gi;
if (!CInk) {
CInk = window.CInk = {};
CInk.log = function log() {
if (console && console.log) {
var args = Array.prototype.slice.call(arguments);
console.log.apply(console, args);
}
};
CInk.warn = function warn() {
if (console && console.warn) {
var args = Array.prototype.slice.call(arguments);
console.warn.apply(console, args);
console.trace();
}
};
CInk.err = function err() {
if (console && console.error) {
var args = Array.prototype.slice.call(arguments);
console.error.apply(console, args);
console.trace();
}
};
}
CInk.isBrowserSupported = function isBrowserSupported() {
var BrowserDetect = window.BrowserDetect;
if (!BrowserDetect) {
CInk.err('BrowserDetect object not found. Please make sure to include depends/browser_detect.js.');
return undefined;
}
var browserSupported = false;
if ((BrowserDetect.browser === 'Firefox' && BrowserDetect.version * 1 >= 4)
|| BrowserDetect.browser === 'Chrome'
|| BrowserDetect.browser === 'Safari') {
browserSupported = true;
}
return browserSupported;
};
CInk.compileAndRun = function compileAndRun(rawCode, canvas, callBackOnFinish, getMeta, variant, slowClear) {
var compiledCode = CInk.Compile(rawCode), err, w, renderer, variName, ctx;
if (isNotDefined(compiledCode)) {
err = "Could not compile code!!! Aborting render.";
CInk.err(err);
callbackWithErr(callBackOnFinish, err);
if (getMeta) {
getMeta('', null);
}
return null;
}
if (!isNotDefined(canvas)) {
if (slowClear) {
//Chrome has a bug where it fails to render strokeText after canvas has been resized.
//http://code.google.com/p/chromium/issues/detail?id=44017
ctx = canvas.getContext('2d');
ctx.setTransform(1, 0, 0, 1, 0, 0);
ctx.clearRect(0, 0, canvas.width, canvas.height);
CInk.log("Using slow method to clear the canvas. Because of Chrome bug#44017.");
} else {
w = canvas.width;
canvas.width = 0;
canvas.width = w;
}
}
renderer = new CInk.Renderer(canvas, compiledCode, callBackOnFinish);
if (renderer !== null) {
variName = renderer.render(variant);
if (getMeta) {
getMeta(variName, compiledCode);
}
}
return renderer;
};
CInk.resetCompileAndRun = function resetCompileAndRun(params) {
if (!isNotDefined(params.rendererVar)) {
params.rendererVar.shutAndDispose(function () {
params.rendererVar = null;
CInk.resetCompileAndRun(params);
});
return;
}
params.rendererVar = CInk.compileAndRun(params.rawCode, params.canvas, params.callBackOnFinish, params.getMeta, params.variant, params.slowClear);
};
CInk.resetAndRun = function resetAndRun(params) { //It doesn't compile. All params of resetCompileAndRun are supported, except,
//replace params.rawCode by params.compiledCode.
var canvas, ctx, renderer, variName, w;
if (!isNotDefined(params.rendererVar)) {
params.rendererVar.shutAndDispose(function () {
params.rendererVar = null;
CInk.resetAndRun(params);
});
return;
}
canvas = params.canvas;
if (!isNotDefined(canvas)) {
if (params.slowClear) {
//Chrome has a bug where it fails to render strokeText after canvas has been resized.
//http://code.google.com/p/chromium/issues/detail?id=44017
ctx = canvas.getContext('2d');
ctx.setTransform(1, 0, 0, 1, 0, 0);
ctx.clearRect(0, 0, canvas.width, canvas.height);
CInk.log("Using slow method to clear the canvas. Because of Chrome bug#44017.");
} else {
w = canvas.width;
canvas.width = 0;
canvas.width = w;
}
}
renderer = new CInk.Renderer(canvas, params.compiledCode, params.callBackOnFinish);
if (renderer !== null) {
variName = renderer.render(params.variant);
if (params.getMeta) {
params.getMeta(variName, params.compiledCode);
}
}
params.rendererVar = renderer;
};
CInk.Renderer = function Renderer(canvas, code, callBackOnFinish) {
var err, canvases, sortedZIndices, ctx, canvasWidth, canvasHeight, halfCanvasWidth, halfCanvasHeight, correctArcPHandling,
rendering, queue, backColor, zEnabled, zOffset, t, l, z, tileH, isInPlaceTiling, shutDown, hasEvents,
callOnDisposeFinish, userGlobalTransform, userGlobalTransformNoTranslation, rendererObj, ID, bc, w, backgroundZ,
timerObj, globalTransforms, LOWEST_PRIORITY, miscTransform;
if (isNotDefined(code) || isNotDefined(canvas)) {
err = "Supplied code or canvas is null!!! Aborting render.";
CInk.err(err);
callbackWithErr(callBackOnFinish, err);
return null;
}
//-----------------
//Public variables.
//-----------------
this.GLOBAL_SCALE = 300;
this.MAX_THREADS = 30;
//------------------
//Private variables.
//------------------
LOWEST_PRIORITY = 10; //Used for optimization.
canvases = {1: canvas};
sortedZIndices = [1];
ctx = canvas.getContext("2d");
if (!ctx.setTransform) {
err = "Bad bad browser! canvas doesn't support setTransform()! So, can't render.";
CInk.err(err);
callbackWithErr(callBackOnFinish, err);
return;
}
canvasWidth = canvas.width;
canvasHeight = canvas.height;
halfCanvasWidth = canvasWidth / 2;
halfCanvasHeight = canvasHeight / 2;
rendering = false;
queue = [];
backColor = code.backColor === null ? null : code.backColor.color;
zEnabled = code.hasZ && !!jQ;
zOffset = 0;
backgroundZ = -10000;
if (zEnabled) {
t = jQ(canvas).offset().top;
l = jQ(canvas).offset().left;
z = getSafeVal(jQ(canvas).css('z-index'), 1);
if (z === 'auto') {
z = -10;
}
jQ(canvas).css({
'z-index': z,
position: 'absolute',
top: t,
left: l
});
zOffset = 1 - z;
if (!jQ(canvas).parent().hasClass('CInkWrapper')) { //Checking if this is already wrapped.
jQ(canvas).wrap('<div class="CInkWrapper"/>'); //So that all zcanvases are placed on after another w/o interference from other doms.
} else { //Already wrapped then we don't re-wrap, but we do need to reset the background canvas, if present.
bc = jQ(canvas).next();
if (bc.length !== 0) {
w = bc.get(0).width;
bc.get(0).width = w;
}
}
}
tileH = getSafeVal(code.tileH, 100);
isInPlaceTiling = getSafeVal(code.inTiling, true);
correctArcPHandling = getSafeVal(code.correctArcP, true);
shutDown = false;
hasEvents = !!(code.rules.MOUSECLICK || code.rules.MOUSEMOVE || code.rules.TYPE || code.rules.TIME);
callOnDisposeFinish = null;
userGlobalTransform = null;
timerObj = null;
globalTransforms = {gx: 0, gy: 0};
//var xmax = 0, xmin = canvasWidth, ymax = 0, ymin = canvasHeight; //Values reversed to make sure tight bounding is found.
rendererObj = this;
ID = new Date().getTime();
//-----------------------
//Private Thread Helpers.
//-----------------------
function ThreadedRuleDraw(shape, transforms, priority) {
this.priority = priority || LOWEST_PRIORITY;
this.gx = globalTransforms.gx;
this.gy = globalTransforms.gy;
this.start = function (isByEvent) {
globalTransforms.gx = this.gx;
globalTransforms.gy = this.gy;
drawRule.call(rendererObj, shape, transforms, priority, isByEvent);
};
}
function ThreadedLoop(c, loopCode, transforms, priority) {
this.priority = priority || LOWEST_PRIORITY;
this.gx = globalTransforms.gx;
this.gy = globalTransforms.gy;
this.start = function (isByEvent) {
globalTransforms.gx = this.gx;
globalTransforms.gy = this.gy;
loop.call(rendererObj, c, loopCode, transforms, priority, isByEvent);
};
}
function ThreadedShapeDraw(i, shapes, transforms, priority) {
this.priority = priority || LOWEST_PRIORITY;
this.gx = globalTransforms.gx;
this.gy = globalTransforms.gy;
this.start = function (isByEvent) {
globalTransforms.gx = this.gx;
globalTransforms.gy = this.gy;
drawAllShapes.call(rendererObj, i, shapes, transforms, priority, isByEvent);
};
}
function ThreadedPath(isNested, name, ops, pathTransform, transforms, priority) {
this.priority = priority || LOWEST_PRIORITY;
this.gx = globalTransforms.gx;
this.gy = globalTransforms.gy;
this.start = function (isByEvent) {
globalTransforms.gx = this.gx;
globalTransforms.gy = this.gy;
drawPath.call(rendererObj, isNested, name, ops, pathTransform, transforms, isByEvent);
};
}
//-----------------------
//Private Helper methods.
//-----------------------
function q(job) {
if (job.priority === LOWEST_PRIORITY) {
queue.push(job);
} else {
sortedAscPush(queue, job, 'priority', true);
}
}
function transformColor(adjustments, currentColor) {
var newColor, adj, key;
newColor = {
h : currentColor.h,
s : currentColor.s,
b : currentColor.b,
a : currentColor.a
};
if (!isNotDefined(adjustments.h)) {
// Add num to the drawing hue value, modulo 360
newColor.h += adjustments.h;
newColor.h %= 360;
}
adj = {};
adj.s = getSafeVal(adjustments.sat, null);
adj.b = getSafeVal(adjustments.b, null);
adj.a = getSafeVal(adjustments.a, null);
// If adj<0 then change the drawing [blah] adj% toward 0.
// If adj>0 then change the drawing [blah] adj% toward 1.
for (key in adj) {
if (adj.hasOwnProperty(key)) {
if (adj[key] !== null) {
if (adj[key] >= 0) {
newColor[key] += adj[key] * (1 - currentColor[key]);
} else {
newColor[key] += adj[key] * currentColor[key];
}
if (newColor[key] < 0) {
newColor[key] = 0;
} else if (newColor[key] > 1) {
newColor[key] = 1;
}
}
}
}
return newColor;
}
function adjustMisc(adjustments, miscTransforms) {
if (adjustments === null || mapLen(adjustments) === 0) {
return miscTransforms;
}
if (isNotDefined(miscTransforms)) {
miscTransforms = {shColor: {
h: 0,
s: 0,
b: 0,
a: 1
}};
}
var newTrans = {
shx: 0,
shy: 0,
shblur: 0
};
//Shadow transforms
newTrans.shColor = transformColor({h: adjustments.shh, sat: adjustments.shsat, b: adjustments.shb, a: adjustments.sha}, miscTransforms.shColor);
if (!isNotDefined(adjustments.shx)) {
newTrans.shx += adjustments.shx;
}
if (!isNotDefined(adjustments.shy)) {
newTrans.shy += adjustments.shy;
}
if (!isNotDefined(adjustments.shblur)) {
newTrans.shblur += adjustments.shblur;
}
return newTrans;
}
function adjustColor(adjustments, currentColor, targetColor) {
if (adjustments === null || mapLen(adjustments) === 0) {
return { color: currentColor, target: targetColor };
}
// See http://www.contextfreeart.org/mediawiki/index.php/Shape_adjustments
var newColor, currentTargetColor, newTargetColor, isTargetSet, k, newTargetColorUpdated,
c, colorTarget;
//Normal color calculations.
newColor = transformColor(adjustments, currentColor);
//Target color calculations.
currentTargetColor = { //|h etc...
h : getSafeVal(adjustments._h, null),
s : getSafeVal(adjustments._sat, null),
b : getSafeVal(adjustments._b, null),
a : getSafeVal(adjustments._a, null)
};
if (isNotDefined(targetColor)) {
isTargetSet = false;
newTargetColor = {h: null, s: null, b: null, a: null};
} else {
isTargetSet = true;
newTargetColor = {
h : getSafeVal(targetColor.h, null),
s : getSafeVal(targetColor.s, null),
b : getSafeVal(targetColor.b, null),
a : getSafeVal(targetColor.a, null)
};
}
for (k in currentTargetColor) {
if (currentTargetColor.hasOwnProperty(k)) {
if (currentTargetColor[k] !== null) {
isTargetSet = true;
newTargetColorUpdated = true;
//Do I need to add or simply set non-hue targets?
newTargetColor[k] = getSafeVal(newTargetColor[k], 0) + currentTargetColor[k];
if (k === 'h') {
newTargetColor[k] %= 360;
} else if (newTargetColor[k] < 0) {
newTargetColor[k] = 0;
} else if (newTargetColor[k] > 1) {
newTargetColor[k] = 1;
}
}
}
}
if (!newTargetColorUpdated) {
newTargetColor = targetColor;
}
//Color target increments, decrements, calculations.
if (isTargetSet) {
colorTarget = { //h| etc...
h : getSafeVal(adjustments.h_, null),
s : getSafeVal(adjustments.sat_, null),
b : getSafeVal(adjustments.b_, null),
a : getSafeVal(adjustments.a_, null)
};
for (k in colorTarget) {
if (colorTarget.hasOwnProperty(k)) {
if (colorTarget[k] !== null && newTargetColor[k] !== null) {
if (k === 'h') {
//var diff = newTargetColor.h - newColor.h;
c = newColor.h + Math.abs(newTargetColor.h - newColor.h) * colorTarget.h;
//if (sign(newTargetColor.h - c) == sign(diff)) {
if (c >= 360) {
c = 360 - c;
} else if (c < 0) {
c += 360;
}
newColor.h = c;
//}
} else {
c = newColor[k];
if (colorTarget[k] >= 0) {
c += colorTarget[k] * (1 - c);
} else {
c += colorTarget[k] * c;
}
if (Math.abs(c - newColor[k]) < Math.abs(newTargetColor[k] - newColor[k])) {
if (c < 0) {
c = 0;
} else if (c > 1) {
c = 1;
}
newColor[k] = c;
} else {
newColor[k] = newTargetColor[k];
}
}
}
}
}
}
return {color: newColor, target: newTargetColor};
}
function adjustTransform(adjs, transformObj) {
var transform, transformZ, i, x, y, translate, r, cosTheta, sinTheta, rotate, s, scale,
f, flip, vX, vY, norm, sk, sx, sy, skew, val, originalCompose;
transform = transformObj.xy;
transformZ = transformObj.z;
for (i = 0; i < adjs.length; i += 1) {
val = adjs[i].val;
if (adjs[i].type === 'gx') { //~ Translation - Global X ~//
x = val;
if (x === 0) {
globalTransforms.gx = 0;
} else {
globalTransforms.gx += x;
}
} else if (adjs[i].type === 'gy') { //~ Translation - Global Y ~//
y = val;
if (y === 0) {
globalTransforms.gy = 0;
} else {
globalTransforms.gy += y;
}
} else if (adjs[i].type === 'x') { //~ Translation - X ~//
x = val;
if (x !== 0) {
translate = toAffineTransformation(1, 0, x,
0, 1, 0);
transform = compose(transform, translate);
}
} else if (adjs[i].type === 'y') { //~ Translation - Y ~//
y = val;
if (y !== 0) {
translate = toAffineTransformation(1, 0, 0,
0, 1, -y); //We negate y since on canvas origin is at top left,
//but we want it at bottom left.
transform = compose(transform, translate);
}
} else if (adjs[i].type === 'z') { //~ Z - Index ~//
transformZ = getSafeVal(transformObj.z, 0) + val;
} else if (adjs[i].type === 'r') { //~ Rotation ~//
r = val;
if (r !== null) {
r = Math.PI * r / 180;
cosTheta = Math.cos(r);
sinTheta = Math.sin(r);
rotate = toAffineTransformation(cosTheta, sinTheta, 0,
-sinTheta, cosTheta, 0); //We rotate clock-wise.
transform = compose(transform, rotate);
}
} else if (adjs[i].type === 's') { //~ Scaling ~//
s = val;
if (s.x !== 1 || s.y !== 1) { //z is ignored as this requires sorting the shapes by z-index. But in CInk we draw it as it available,
//so z cannot be honored.
scale = toAffineTransformation(s.x, 0, 0,
0, s.y, 0);
transform = compose(transform, scale);
}
} else if (adjs[i].type === 'f') { //~ Flip around a line through the origin ~//
f = val;
if (f !== null) {
// Flip 0 means to flip along the X axis. Flip 90 means to flip along the Y axis.
// That's why the flip vector (vX, vY) is PI/2 radians further along than expected.
vX = Math.cos(-2 * Math.PI * f / 360.0);
vY = Math.sin(-2 * Math.PI * f / 360.0);
norm = 1 / (vX * vX + vY * vY);
flip = toAffineTransformation((vX * vX - vY * vY) / norm, 2 * vX * vY / norm, 0,
2 * vX * vY / norm, (vY * vY - vX * vX) / norm, 0);
transform = compose(transform, flip);
}
} else if (adjs[i].type === 'skew') { //~ Skew ~//
sk = val;
if (sk.x !== 0 || sk.y !== 0) {
sx = sk.x * Math.PI / 180.0; //Since in CInk we provide skew angle, not skew distance.
sy = sk.y * Math.PI / 180.0;
//From http://www.html5canvastutorials.com/advanced/html5-canvas-shear-transform-tutorial
skew = toAffineTransformation(1, -sy, 0,
-sx, 1, 0);
transform = compose(transform, skew);
}
}
}
return {xy: transform, z: transformZ};
}
function adjustText(adjs, textTransform) {
if (isNotDefined(adjs)) {
return textTransform;
}
if (isNotDefined(textTransform)) {
textTransform = {};
}
var tt, adjT, t, c;
tt = {
txt: getSafeVal(textTransform.txt, ''),
fontName: getSafeVal(textTransform.fontName, 'Arial'),
fontSize: getSafeVal(textTransform.fontSize, 5),
fontSizeUnit: getSafeVal(textTransform.fontSizeUnit, 'px'),
isStrokeText: getSafeVal(textTransform.isStrokeText, false),
textBaseline: getSafeVal(textTransform.textBaseline, 'alphabetic'),
textAlignment: getSafeVal(textTransform.textAlignment, 'start'),
strokeWidth: getSafeVal(textTransform.strokeWidth, 2),
fontStyle: getSafeVal(textTransform.fontStyle, '')
};
adjT = '';
if (!isNotDefined(adjs._t)) {
t = tt.txt;
if (t.length !== 0) {
adjT = String.fromCharCode(t.charCodeAt(t.length - 1) + adjs._t);
}
}
if (getSafeVal(adjs.e, false)) {
tt.txt = '';
}
if (getSafeVal(adjs.bkspc, false)) {
t = tt.txt;
if (t.length !== 0) {
tt.txt = t.substr(0, t.length - 1);
}
}
tt.txt = tt.txt.concat(adjT); //This is done just to make sure _t still retains data irrespective
//of if e and/or bkspc are given as they should effect only the previous text, i.e. tt.txt.
if (!isNotDefined(adjs.t)) {
t = adjs.t;
UNICODE_PATTERN.lastIndex = 0;
while ((c = UNICODE_PATTERN.exec(t)) !== null) {
t = t.replace(c[0], String.fromCharCode(c[1]));
UNICODE_PATTERN.lastIndex = UNICODE_PATTERN.lastIndex - c[0].length + 1;
}
tt.txt = tt.txt.concat(t);
}
if (!isNotDefined(adjs.fs)) {
tt.fontSize += adjs.fs;
}
if (!isNotDefined(adjs.sw)) {
tt.strokeWidth += adjs.sw;
}
if (!isNotDefined(adjs.st)) {
tt.isStrokeText = adjs.st;
}
if (!isNotDefined(adjs.fn)) {
tt.fontName = adjs.fn;
}
if (!isNotDefined(adjs.fu)) {
tt.fontSizeUnit = adjs.fu;
}
if (!isNotDefined(adjs.base)) {
tt.textBaseline = adjs.base;
}
if (!isNotDefined(adjs.align)) {
tt.textAlignment = adjs.align;
}
if (!isNotDefined(adjs.fstyle)) {
tt.fontStyle = adjs.fstyle === 'normal' ? '' : adjs.fstyle;
}
return tt;
}
function setTransform(trans, ctx, applyGlobalScale, applyGlobalTranslation, applyGlobalTransforms) {
var gx = globalTransforms.gx * trans[0][0],
gy = globalTransforms.gy * trans[1][1];
if (applyGlobalScale !== false) {
// Globally center and scale the transform (often the pictures are too small)
ctx.setTransform(rendererObj.GLOBAL_SCALE, 0, 0, rendererObj.GLOBAL_SCALE, halfCanvasWidth, halfCanvasHeight);
} else {
if (applyGlobalTranslation === true) {
ctx.setTransform(1, 0, 0, 1, halfCanvasWidth, halfCanvasHeight);
} else {
ctx.setTransform(1, 0, 0, 1, 0, 0);
}
}
if (applyGlobalTransforms === false) {
gx = 0;
gy = 0;
}
// Perform the actual transformation.
ctx.transform(trans[0][0], trans[1][0],
trans[0][1], trans[1][1],
trans[0][2] + gx, trans[1][2] + gy);
}
function draw(isBackZInBound, transform, drawFunc, applyGlobalScale, applyGlobalTranslation, applyGlobalTransforms) {
var zCtx = ctx, z, canvasZ; //This is of z==1.
if (zEnabled) {// && !skipZCheck) {
z = Math.round(transform.z * 100); //Multiplying by 100 to get more precision, as we need to round it off, since z-index should be integers.
if (z > 200) {
z = 200; //+z-index is capped to 200, so that UIs can guarantee that top elements will be rendered.
}
if (z === 1) {
z = 2;
} else if (!isBackZInBound && z === backgroundZ) { //Lower limit of z.
z = backgroundZ + 1;
}
canvasZ = canvases[z];
if (isNotDefined(canvasZ)) {
canvasZ = createCloneCanvas(canvas, z - zOffset);
canvases[z] = canvasZ;
sortedAscPush(sortedZIndices, z);
}
zCtx = canvasZ.getContext('2d');
}
setTransform(transform.xy, zCtx, applyGlobalScale, applyGlobalTranslation, applyGlobalTransforms);
drawFunc(zCtx);
return z;
}
function schedulePathDraw(shapeName, transforms) {
q(new ThreadedPath(false, shapeName, null,
{currCoord: {x: 0, y: 0}, isCurve: false},
transforms, 2));
}
function applyShadowTransform(ctx, transform) {
if (!isNotDefined(transform)) {
ctx.shadowOffsetX = transform.shx;
ctx.shadowOffsetY = transform.shy;
ctx.shadowBlur = transform.shblur;
ctx.shadowColor = colorToRgba(transform.shColor);
}
}
function normalizeStrokeWidth(sw) {
return sw / rendererObj.GLOBAL_SCALE;
}
/*function reflectAboutLine(pt, aboutP1, aboutP2) {
var x, y, C;
C = (aboutP1.x - aboutP2.x) * (pt.x - aboutP2.x) + (aboutP1.y - aboutP2.y) * (pt.y - aboutP2.y) * 1.0;
C = C / (Math.pow(aboutP1.x - aboutP2.x, 2) + Math.pow(aboutP1.y - aboutP2.y, 2));
x = 2 * aboutP2.x + (aboutP1.x - aboutP2.x) * C;
y = 2 * aboutP2.y + (aboutP1.y - aboutP2.y) * C;
return {x: x, y: y};
}*/
function reflectAboutPt(pt, aboutPt) {
var x, y, C, D, C2;
if (pt.x === aboutPt.x) {
x = pt.x;
y = 2 * aboutPt.y - pt.y;
} else {
D = Math.sqrt(Math.pow(aboutPt.x - pt.x, 2) + Math.pow(aboutPt.y - pt.y, 2));
C = (pt.y - aboutPt.y) / (pt.x - aboutPt.x);
C2 = Math.sqrt(1 + C * C);
x = D / C2 + aboutPt.x;
if (x === pt.x) {
x = -D / C2 + aboutPt.x;
}
y = C * (x - aboutPt.x) + aboutPt.y;
}
return {x: x, y: y};
}
function scheduleTransformsAdjustment(currTransforms, pathTransform) {
var transforms = clone(currTransforms);
pathTransform.draw.push(['geoAdjust', function (currPathTransform, geoAdjustment) {
var trans = clone(transforms), tmpGeo; //cloning again so that this method can be used again. E.g. when we have two consecutive FILL{}.
tmpGeo = adjustTransform(geoAdjustment, {xy: IDENTITY_TRANSFORM(), z: trans.geo.z});
trans.geo.z = tmpGeo.z;
trans.geo.xy = compose(tmpGeo.xy, trans.geo.xy);
trans.geo.xy = compose(currPathTransform.globalXYTrans, trans.geo.xy);
currPathTransform.currTransforms = trans;
}]);
}
function scheduleDraw(name, localPathTransform, f) {
localPathTransform.draw.push([name, function (pathTransform) {
draw(false, pathTransform.currTransforms.geo, f);
}]);
}
function scheduleMoveTo(isRelative, localPathTransform, x, y) {
scheduleDraw('mv', localPathTransform, function (ctx) {
ctx.moveTo(x, -y);
});
}
function scheduleLineTo(isRelative, localPathTransform, x, y) {
scheduleDraw('ln', localPathTransform, function (ctx) {
ctx.lineTo(x, -y);
});
}
function scheduleArcTo(isRelative, localPathTransform, t0, t1, c, ang, rx, ry, large) {
scheduleDraw('ac', localPathTransform, function (ctx) {
var dt = 0.1, t, xy, check, len = t1 - t0, smallLen, getXY,
cosA, sinA, TWOPI = 2 * Math.PI;
cosA = Math.cos(ang);
sinA = Math.sin(ang);
getXY = function getXY(t) {