mirror of
https://github.com/niklasvh/html2canvas.git
synced 2023-08-10 21:13:10 +03:00
416 lines
16 KiB
JavaScript
416 lines
16 KiB
JavaScript
/*
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html2canvas @VERSION@ <http://html2canvas.hertzen.com>
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Copyright (c) 2011 Niklas von Hertzen. All rights reserved.
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http://www.twitter.com/niklasvh
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Contributor(s):
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Niklas von Hertzen <http://www.twitter.com/niklasvh>
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André Fiedler <http://www.twitter.com/sonnenkiste>
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Released under MIT License
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*/
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(function(){
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_html2canvas.Generate = {};
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var reGradients = [
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/^(-webkit-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,
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/^(-o-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,
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/^(-webkit-gradient)\((linear|radial),\s((?:\d{1,3}%?)\s(?:\d{1,3}%?),\s(?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)-]+)\)$/,
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/^(-moz-linear-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)]+)\)$/,
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/^(-webkit-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z-]+)([\w\d\.\s,%\(\)]+)\)$/,
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/^(-moz-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s?([a-z-]*)([\w\d\.\s,%\(\)]+)\)$/,
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/^(-o-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z-]+)([\w\d\.\s,%\(\)]+)\)$/
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];
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/*
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* TODO: Add IE10 vendor prefix (-ms) support
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* TODO: Add W3C gradient (linear-gradient) support
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* TODO: Add old Webkit -webkit-gradient(radial, ...) support (new Chrome doesn´t support old syntax?!)
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* TODO: Maybe some RegExp optimizations are possible ;o)
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*/
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_html2canvas.Generate.parseGradient = function(css, bounds) {
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var gradient, i, len = reGradients.length, m1, stop, m2, m2Len, step, m3;
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for(i = 0; i < len; i+=1){
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m1 = css.match(reGradients[i]);
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if(m1) break;
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}
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if(m1) {
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switch(m1[1]) {
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case '-webkit-linear-gradient':
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case '-o-linear-gradient':
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gradient = {
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type: 'linear',
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x0: null,
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y0: null,
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x1: null,
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y1: null,
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colorStops: []
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};
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// get coordinates
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m2 = m1[2].match(/\w+/g);
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if(m2){
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m2Len = m2.length;
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for(i = 0; i < m2Len; i+=1){
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switch(m2[i]) {
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case 'top':
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gradient.y0 = 0;
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gradient.y1 = bounds.height;
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break;
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case 'right':
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gradient.x0 = bounds.width;
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gradient.x1 = 0;
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break;
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case 'bottom':
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gradient.y0 = bounds.height;
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gradient.y1 = 0;
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break;
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case 'left':
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gradient.x0 = 0;
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gradient.x1 = bounds.width;
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break;
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}
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}
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}
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if(gradient.x0 === null && gradient.x1 === null){ // center
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gradient.x0 = gradient.x1 = bounds.width / 2;
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}
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if(gradient.y0 === null && gradient.y1 === null){ // center
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gradient.y0 = gradient.y1 = bounds.height / 2;
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}
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// get colors and stops
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m2 = m1[3].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}(?:%|px))?)+/g);
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if(m2){
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m2Len = m2.length;
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step = 1 / Math.max(m2Len - 1, 1);
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for(i = 0; i < m2Len; i+=1){
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m3 = m2[i].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%|px)?/);
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if(m3[2]){
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stop = parseFloat(m3[2]);
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if(m3[3] === '%'){
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stop /= 100;
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} else { // px - stupid opera
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stop /= bounds.width;
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}
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} else {
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stop = i * step;
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}
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gradient.colorStops.push({
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color: m3[1],
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stop: stop
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});
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}
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}
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break;
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case '-webkit-gradient':
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gradient = {
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type: m1[2],
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x0: 0,
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y0: 0,
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x1: 0,
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y1: 0,
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colorStops: []
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};
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// get coordinates
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m2 = m1[3].match(/(\d{1,3})%?\s(\d{1,3})%?,\s(\d{1,3})%?\s(\d{1,3})%?/);
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if(m2){
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gradient.x0 = (m2[1] * bounds.width) / 100;
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gradient.y0 = (m2[2] * bounds.height) / 100;
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gradient.x1 = (m2[3] * bounds.width) / 100;
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gradient.y1 = (m2[4] * bounds.height) / 100;
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}
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// get colors and stops
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m2 = m1[4].match(/((?:from|to|color-stop)\((?:[0-9\.]+,\s)?(?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)\))+/g);
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if(m2){
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m2Len = m2.length;
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for(i = 0; i < m2Len; i+=1){
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m3 = m2[i].match(/(from|to|color-stop)\(([0-9\.]+)?(?:,\s)?((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\)/);
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stop = parseFloat(m3[2]);
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if(m3[1] === 'from') stop = 0.0;
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if(m3[1] === 'to') stop = 1.0;
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gradient.colorStops.push({
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color: m3[3],
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stop: stop
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});
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}
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}
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break;
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case '-moz-linear-gradient':
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gradient = {
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type: 'linear',
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x0: 0,
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y0: 0,
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x1: 0,
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y1: 0,
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colorStops: []
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};
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// get coordinates
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m2 = m1[2].match(/(\d{1,3})%?\s(\d{1,3})%?/);
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// m2[1] == 0% -> left
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// m2[1] == 50% -> center
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// m2[1] == 100% -> right
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// m2[2] == 0% -> top
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// m2[2] == 50% -> center
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// m2[2] == 100% -> bottom
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if(m2){
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gradient.x0 = (m2[1] * bounds.width) / 100;
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gradient.y0 = (m2[2] * bounds.height) / 100;
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gradient.x1 = bounds.width - gradient.x0;
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gradient.y1 = bounds.height - gradient.y0;
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}
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// get colors and stops
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m2 = m1[3].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}%)?)+/g);
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if(m2){
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m2Len = m2.length;
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step = 1 / Math.max(m2Len - 1, 1);
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for(i = 0; i < m2Len; i+=1){
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m3 = m2[i].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%)?/);
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if(m3[2]){
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stop = parseFloat(m3[2]);
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if(m3[3]){ // percentage
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stop /= 100;
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}
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} else {
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stop = i * step;
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}
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gradient.colorStops.push({
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color: m3[1],
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stop: stop
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});
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}
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}
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break;
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case '-webkit-radial-gradient':
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case '-moz-radial-gradient':
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case '-o-radial-gradient':
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gradient = {
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type: 'radial',
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x0: 0,
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y0: 0,
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x1: bounds.width,
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y1: bounds.height,
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cx: 0,
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cy: 0,
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rx: 0,
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ry: 0,
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colorStops: []
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};
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// center
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m2 = m1[2].match(/(\d{1,3})%?\s(\d{1,3})%?/);
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if(m2){
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gradient.cx = (m2[1] * bounds.width) / 100;
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gradient.cy = (m2[2] * bounds.height) / 100;
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}
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// size
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m2 = m1[3].match(/\w+/);
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m3 = m1[4].match(/[a-z-]*/);
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if(m2 && m3){
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switch(m3[0]){
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case 'farthest-corner':
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case 'cover': // is equivalent to farthest-corner
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case '': // mozilla removes "cover" from definition :(
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var tl = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.cy, 2));
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var tr = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
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var br = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
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var bl = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.cy, 2));
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gradient.rx = gradient.ry = Math.max(tl, tr, br, bl);
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break;
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case 'closest-corner':
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var tl = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.cy, 2));
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var tr = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
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var br = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
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var bl = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.cy, 2));
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gradient.rx = gradient.ry = Math.min(tl, tr, br, bl);
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break;
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case 'farthest-side':
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if(m2[0] === 'circle'){
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gradient.rx = gradient.ry = Math.max(
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gradient.cx,
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gradient.cy,
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gradient.x1 - gradient.cx,
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gradient.y1 - gradient.cy
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);
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} else { // ellipse
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h2clog('No ellipse gradient supported by now, cause canvas can´t draw ellipse :(');
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gradient.rx = Math.max(
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gradient.cx,
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gradient.x1 - gradient.cx
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);
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gradient.ry = Math.max(
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gradient.cy,
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gradient.y1 - gradient.cy
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);
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}
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break;
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case 'closest-side':
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case 'contain': // is equivalent to closest-side
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if(m2[0] === 'circle'){
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gradient.rx = gradient.ry = Math.min(
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gradient.cx,
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gradient.cy,
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gradient.x1 - gradient.cx,
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gradient.y1 - gradient.cy
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);
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} else { // ellipse
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h2clog('No ellipse gradient supported by now, cause canvas can´t draw ellipse :(');
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gradient.rx = Math.min(
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gradient.cx,
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gradient.x1 - gradient.cx
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);
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gradient.ry = Math.min(
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gradient.cy,
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gradient.y1 - gradient.cy
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);
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}
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break;
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// TODO: add support for "30px 40px" sizes (webkit only)
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}
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}
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// color stops
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m2 = m1[5].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}(?:%|px))?)+/g);
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if(m2){
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m2Len = m2.length;
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step = 1 / Math.max(m2Len - 1, 1);
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for(i = 0; i < m2Len; i+=1){
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m3 = m2[i].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%|px)?/);
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if(m3[2]){
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stop = parseFloat(m3[2]);
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if(m3[3] === '%'){
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stop /= 100;
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} else { // px - stupid opera
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stop /= bounds.width;
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}
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} else {
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stop = i * step;
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}
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gradient.colorStops.push({
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color: m3[1],
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stop: stop
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});
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}
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}
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break;
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}
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}
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return gradient;
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};
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_html2canvas.Generate.Gradient = function(src, bounds) {
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var canvas = document.createElement('canvas'),
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ctx = canvas.getContext('2d'),
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gradient, grad, i, len, img;
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canvas.width = bounds.width;
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canvas.height = bounds.height;
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// TODO: add support for multi defined background gradients (like radial gradient example in background.html)
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gradient = _html2canvas.Generate.parseGradient(src, bounds);
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img = new Image();
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if(gradient && gradient.type === 'linear'){
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grad = ctx.createLinearGradient(gradient.x0, gradient.y0, gradient.x1, gradient.y1);
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for (i = 0, len = gradient.colorStops.length; i < len; i+=1) {
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try {
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grad.addColorStop(gradient.colorStops[i].stop, gradient.colorStops[i].color);
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}
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catch(e) {
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h2clog(['failed to add color stop: ', e, '; tried to add: ', gradient.colorStops[i], '; stop: ', i, '; in: ', src]);
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}
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}
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ctx.fillStyle = grad;
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ctx.fillRect(0, 0, bounds.width, bounds.height);
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img.src = canvas.toDataURL();
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} else if(gradient && gradient.type === 'radial'){
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// TODO: Add support for "ellipsis" drawing
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grad = ctx.createRadialGradient(gradient.cx, gradient.cy, 0, gradient.cx, gradient.cy, gradient.rx);
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for (i = 0, len = gradient.colorStops.length; i < len; i+=1) {
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try {
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grad.addColorStop(gradient.colorStops[i].stop, gradient.colorStops[i].color);
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}
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catch(e) {
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h2clog(['failed to add color stop: ', e, '; tried to add: ', gradient.colorStops[i], '; stop: ', i, '; in: ', src]);
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}
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}
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ctx.fillStyle = grad;
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ctx.fillRect(0, 0, bounds.width, bounds.height);
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img.src = canvas.toDataURL();
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}
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return img;
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};
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_html2canvas.Generate.ListAlpha = function(number) {
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var tmp = "",
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modulus;
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do {
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modulus = number % 26;
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tmp = String.fromCharCode((modulus) + 64) + tmp;
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number = number / 26;
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}while((number*26) > 26);
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return tmp;
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};
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_html2canvas.Generate.ListRoman = function(number) {
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var romanArray = ["M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"],
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decimal = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1],
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roman = "",
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v,
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len = romanArray.length;
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if (number <= 0 || number >= 4000) {
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return number;
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}
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for (v=0; v < len; v+=1) {
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while (number >= decimal[v]) {
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number -= decimal[v];
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roman += romanArray[v];
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}
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}
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return roman;
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};
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})(); |