From ba0306af49151cd4d8cfffe4cbac30a513c5545d Mon Sep 17 00:00:00 2001 From: Niklas von Hertzen Date: Sat, 16 Jul 2011 22:35:06 +0300 Subject: [PATCH] added support for font-metrics, to find baseline information for text (text-decoration:underline) --- build/html2canvas.js | 104 +++++++++++++++++++++++++++++++++------ build/html2canvas.min.js | 31 ++++++------ src/Core.js | 1 + src/Text.js | 103 ++++++++++++++++++++++++++++++++------ 4 files changed, 195 insertions(+), 44 deletions(-) diff --git a/build/html2canvas.js b/build/html2canvas.js index ed5f18f..05a7a6e 100644 --- a/build/html2canvas.js +++ b/build/html2canvas.js @@ -56,6 +56,7 @@ function html2canvas(el, userOptions) { image; this.imagesLoaded = 0; this.images = []; + this.fontData = []; this.ignoreElements = "IFRAME|OBJECT|PARAM"; @@ -581,10 +582,7 @@ html2canvas.prototype.preloadImage = function(src){ html2canvas.prototype.newText = function(el,textNode){ - - - - + var family = this.getCSS(el,"font-family"); var size = this.getCSS(el,"font-size"); var color = this.getCSS(el,"color"); @@ -608,15 +606,17 @@ html2canvas.prototype.newText = function(el,textNode){ break; } + + if (text_decoration!="none"){ + var metrics = this.fontMetrics(family,size); + + } + this.ctx.font = bold+" "+font_style+" "+size+" "+family; this.ctx.fillStyle = color; - - - - - + var oldTextNode = textNode; for(var c=0;c-1){ + return this.fontData[findMetrics+1]; + } + + var container = document.createElement('div'); + document.getElementsByTagName('body')[0].appendChild(container); + + // jquery to speed this up, TODO remove jquery dependancy + $(container).css({ + visibility:'hidden', + fontFamily:font, + fontSize:fontSize, + margin:0, + padding:0 + }); + + + + var img = document.createElement('img'); + img.src = "http://html2canvas.hertzen.com/images/8.jpg"; + img.width = 1; + img.height = 1; + + $(img).css({ + margin:0, + padding:0 + }); + var span = document.createElement('span'); + + $(span).css({ + fontFamily:font, + fontSize:fontSize, + margin:0, + padding:0 + }); + + + span.appendChild(document.createTextNode('Hidden Text')); + container.appendChild(span); + container.appendChild(img); + var baseline = (img.offsetTop-span.offsetTop)+1; + + container.removeChild(span); + container.appendChild(document.createTextNode('Hidden Text')); + + $(container).css('line-height','normal'); + $(img).css("vertical-align","super"); + var middle = (img.offsetTop-container.offsetTop)+1; + + var metricsObj = { + baseline: baseline, + lineWidth: 1, + middle: middle + }; + + + this.fontData.push(font+"-"+fontSize); + this.fontData.push(metricsObj); + + $(container).remove(); + + + + return metricsObj; + +} /* - * Function to apply text-transform attribute to text - */ + * Function to apply text-transform attribute to text + */ html2canvas.prototype.textTransform = function(text,transform){ switch(transform){ case "lowercase": diff --git a/build/html2canvas.min.js b/build/html2canvas.min.js index 80e0c22..dd3f5ae 100644 --- a/build/html2canvas.min.js +++ b/build/html2canvas.min.js @@ -6,22 +6,25 @@ * Released under MIT License */ -function html2canvas(a,b){this.opts=this.extendObj(b||{},{logging:!1,ready:function(a){document.body.appendChild(a)},renderViewport:!0});this.element=a;this.imagesLoaded=0;this.images=[];this.ignoreElements="IFRAME|OBJECT|PARAM";this.useRangeBounds=!1;if(document.createRange){var c=document.createRange();this.useRangeBounds=new Boolean(c.getBoundingClientRect)}this.init()} +function html2canvas(a,b){this.opts=this.extendObj(b||{},{logging:!1,ready:function(a){document.body.appendChild(a)},renderViewport:!0});this.element=a;this.imagesLoaded=0;this.images=[];this.fontData=[];this.ignoreElements="IFRAME|OBJECT|PARAM";this.useRangeBounds=!1;if(document.createRange){var c=document.createRange();this.useRangeBounds=new Boolean(c.getBoundingClientRect)}this.init()} html2canvas.prototype.init=function(){var a=this;this.canvas=document.createElement("canvas");this.canvas.width=$(document).width();this.canvas.height=$(document).height()+10;if(this.canvas.getContext)this.ctx=this.canvas.getContext("2d");this.ctx?(this.ctx.textBaseline="bottom",this.log("Finding background images"),this.getImages(this.element),this.log("Finding images"),this.each(document.images,function(b,c){a.preloadImage(a.getAttr(c,"src"))}),this.images.length==0&&this.start()):this.log("Canvas not available")}; html2canvas.prototype.start=function(){if(this.images.length==0||this.imagesLoaded==this.images.length/2)this.log("Started parsing"),this.newElement(this.element),this.parseElement(this.element)};html2canvas.prototype.finish=function(){this.log("Finished rendering");if(this.opts.renderViewport){var a=document.createElement("canvas");a.getContext("2d");a.width=window.innerWidth;a.height=window.innerHeight}this.opts.ready(this.canvas)}; -html2canvas.prototype.drawBackground=function(a,b){var c=this.getCSS(a,"background-image"),f=this.getCSS(a,"background-repeat");if(typeof c!="undefined"&&/^(1|none)$/.test(c)==!1){var c=this.backgroundImageUrl(c),d=this.loadImage(c),h=this.getBackgroundPosition(a,b,d);if(d)switch(f){case "repeat-x":this.drawbackgroundRepeatX(d,h,b.left,b.top,b.width,b.height);break;case "repeat-y":this.drawbackgroundRepeatY(d,h,b.left,b.top,b.width,b.height);break;case "no-repeat":this.drawBackgroundRepeat(d,h.left+ -b.left,h.top+b.top,Math.min(b.width,d.width),Math.min(b.height,d.height),b.left,b.top);break;default:var g;h.top-=Math.ceil(h.top/d.height)*d.height;for(c=b.top+h.top;c<=b.height+b.top;)f=Math.min(d.height,b.height+b.top-c),f=Math.floor(c+d.height)>f+c?f+c-c:d.height,c0&&(h.top+=g),c=Math.floor(c+d.height)-g}else this.log("Error loading background:"+c)}}; -html2canvas.prototype.backgroundImageUrl=function(a){a.substr(0,5)=='url("'?(a=a.substr(5),a=a.substr(0,a.length-2)):(a=a.substr(4),a=a.substr(0,a.length-1));return a};html2canvas.prototype.getBackgroundPosition=function(a,b,c){var f=this.getCSS(a,"background-position").split(" "),d;f[0].indexOf("%")!=-1?(d=parseFloat(f[0])/100,a=b.width*d-c.width*d):a=parseInt(f[0],10);f[1].indexOf("%")!=-1?(d=parseFloat(f[1])/100,b=b.height*d-c.height*d):b=parseInt(f[1],10);return{top:b,left:a}}; -html2canvas.prototype.drawbackgroundRepeatY=function(a,b,c,f,d,h){var g=Math.min(a.width,d),e;b.top-=Math.ceil(b.top/a.height)*a.height;for(e=f+b.top;e<=h+f;)d=Math.floor(e+a.height)>h+f?h+f-e:a.height,this.drawBackgroundRepeat(a,c+b.left,e,g,d,c,f),e=Math.floor(e+a.height)}; -html2canvas.prototype.drawbackgroundRepeatX=function(a,b,c,f,d,h){var h=Math.min(a.height,h),g,e;b.left-=Math.ceil(b.left/a.width)*a.width;for(e=c+b.left;e<=d+c;)g=Math.floor(e+a.width)>d+c?d+c-e:a.width,this.drawBackgroundRepeat(a,e,f+b.top,g,h,c,f),e=Math.floor(e+a.width)};html2canvas.prototype.drawBackgroundRepeat=function(a,b,c,f,d,h,g){var e=0,i=0;h-b>0&&(e=h-b);g-c>0&&(i=g-c);this.ctx.drawImage(a,e,i,f-e,d-i,b+e,c+i,f-e,d-i)}; -html2canvas.prototype.getBorderData=function(a){var b=[],c=this;this.each(["top","right","bottom","left"],function(f,d){b.push({width:parseInt(c.getCSS(a,"border-"+d+"-width"),10),color:c.getCSS(a,"border-"+d+"-color")})});return b}; -html2canvas.prototype.newElement=function(a){var b=this.getBounds(a),c=b.left,f=b.top,d=b.width,h=b.height,g=this,b=this.getCSS(a,"background-color"),e=this.getBorderData(a);this.each(e,function(a,b){if(b.width>0){var j=c,k=f,l=d,m=h-e[2].width;switch(a){case 0:m=e[0].width;break;case 1:j=c+d-e[1].width;l=e[1].width;break;case 2:k=k+h-e[2].width;m=e[2].width;break;case 3:l=e[3].width}g.newRect(j,k,l,m,b.color)}});this.newRect(c+e[3].width,f+e[0].width,d-(e[1].width+e[3].width),h-(e[0].width+e[2].width), -b);this.drawBackground(a,{left:c+e[3].width,top:f+e[0].width,width:d-(e[1].width+e[3].width),height:h-(e[0].width+e[2].width)});a.nodeName=="IMG"&&((b=g.loadImage(g.getAttr(a,"src")))?this.ctx.drawImage(b,c+parseInt(g.getCSS(a,"padding-left"),10),f+parseInt(g.getCSS(a,"padding-top"),10)):this.log("Error loading :"+g.getAttr(a,"src")))};html2canvas.prototype.printText=function(a,b,c){this.trim(a).length>0&&this.ctx.fillText(a,b,c)}; -html2canvas.prototype.newRect=function(a,b,c,f,d){if(d!="transparent")this.ctx.fillStyle=d,this.ctx.fillRect(a,b,c,f)};html2canvas.prototype.getImages=function(a){var b=this;this.each($(a).contents(),function(a,f){RegExp("("+this.ignoreElements+")").test(f.nodeName)||b.getImages(f)});if(a.nodeType==1||typeof a.nodeType=="undefined")(a=this.getCSS(a,"background-image"))&&a!="1"&&a!="none"&&a.substring(0,7)!="-webkit"&&a.substring(0,4)!="-moz"&&this.preloadImage(this.backgroundImageUrl(a))}; +html2canvas.prototype.drawBackground=function(a,b){var c=this.getCSS(a,"background-image"),e=this.getCSS(a,"background-repeat");if(typeof c!="undefined"&&/^(1|none)$/.test(c)==!1){var c=this.backgroundImageUrl(c),d=this.loadImage(c),h=this.getBackgroundPosition(a,b,d);if(d)switch(e){case "repeat-x":this.drawbackgroundRepeatX(d,h,b.left,b.top,b.width,b.height);break;case "repeat-y":this.drawbackgroundRepeatY(d,h,b.left,b.top,b.width,b.height);break;case "no-repeat":this.drawBackgroundRepeat(d,h.left+ +b.left,h.top+b.top,Math.min(b.width,d.width),Math.min(b.height,d.height),b.left,b.top);break;default:var g;h.top-=Math.ceil(h.top/d.height)*d.height;for(c=b.top+h.top;c<=b.height+b.top;)e=Math.min(d.height,b.height+b.top-c),e=Math.floor(c+d.height)>e+c?e+c-c:d.height,c0&&(h.top+=g),c=Math.floor(c+d.height)-g}else this.log("Error loading background:"+c)}}; +html2canvas.prototype.backgroundImageUrl=function(a){a.substr(0,5)=='url("'?(a=a.substr(5),a=a.substr(0,a.length-2)):(a=a.substr(4),a=a.substr(0,a.length-1));return a};html2canvas.prototype.getBackgroundPosition=function(a,b,c){var e=this.getCSS(a,"background-position").split(" "),d;e[0].indexOf("%")!=-1?(d=parseFloat(e[0])/100,a=b.width*d-c.width*d):a=parseInt(e[0],10);e[1].indexOf("%")!=-1?(d=parseFloat(e[1])/100,b=b.height*d-c.height*d):b=parseInt(e[1],10);return{top:b,left:a}}; +html2canvas.prototype.drawbackgroundRepeatY=function(a,b,c,e,d,h){var g=Math.min(a.width,d),f;b.top-=Math.ceil(b.top/a.height)*a.height;for(f=e+b.top;f<=h+e;)d=Math.floor(f+a.height)>h+e?h+e-f:a.height,this.drawBackgroundRepeat(a,c+b.left,f,g,d,c,e),f=Math.floor(f+a.height)}; +html2canvas.prototype.drawbackgroundRepeatX=function(a,b,c,e,d,h){var h=Math.min(a.height,h),g,f;b.left-=Math.ceil(b.left/a.width)*a.width;for(f=c+b.left;f<=d+c;)g=Math.floor(f+a.width)>d+c?d+c-f:a.width,this.drawBackgroundRepeat(a,f,e+b.top,g,h,c,e),f=Math.floor(f+a.width)};html2canvas.prototype.drawBackgroundRepeat=function(a,b,c,e,d,h,g){var f=0,i=0;h-b>0&&(f=h-b);g-c>0&&(i=g-c);this.ctx.drawImage(a,f,i,e-f,d-i,b+f,c+i,e-f,d-i)}; +html2canvas.prototype.getBorderData=function(a){var b=[],c=this;this.each(["top","right","bottom","left"],function(e,d){b.push({width:parseInt(c.getCSS(a,"border-"+d+"-width"),10),color:c.getCSS(a,"border-"+d+"-color")})});return b}; +html2canvas.prototype.newElement=function(a){var b=this.getBounds(a),c=b.left,e=b.top,d=b.width,h=b.height,g=this,b=this.getCSS(a,"background-color"),f=this.getBorderData(a);this.each(f,function(a,b){if(b.width>0){var k=c,j=e,l=d,n=h-f[2].width;switch(a){case 0:n=f[0].width;break;case 1:k=c+d-f[1].width;l=f[1].width;break;case 2:j=j+h-f[2].width;n=f[2].width;break;case 3:l=f[3].width}g.newRect(k,j,l,n,b.color)}});this.newRect(c+f[3].width,e+f[0].width,d-(f[1].width+f[3].width),h-(f[0].width+f[2].width), +b);this.drawBackground(a,{left:c+f[3].width,top:e+f[0].width,width:d-(f[1].width+f[3].width),height:h-(f[0].width+f[2].width)});a.nodeName=="IMG"&&((b=g.loadImage(g.getAttr(a,"src")))?this.ctx.drawImage(b,c+parseInt(g.getCSS(a,"padding-left"),10),e+parseInt(g.getCSS(a,"padding-top"),10)):this.log("Error loading :"+g.getAttr(a,"src")))};html2canvas.prototype.printText=function(a,b,c){this.trim(a).length>0&&this.ctx.fillText(a,b,c)}; +html2canvas.prototype.newRect=function(a,b,c,e,d){if(d!="transparent")this.ctx.fillStyle=d,this.ctx.fillRect(a,b,c,e)};html2canvas.prototype.getImages=function(a){var b=this;this.each($(a).contents(),function(a,e){RegExp("("+this.ignoreElements+")").test(e.nodeName)||b.getImages(e)});if(a.nodeType==1||typeof a.nodeType=="undefined")(a=this.getCSS(a,"background-image"))&&a!="1"&&a!="none"&&a.substring(0,7)!="-webkit"&&a.substring(0,4)!="-moz"&&this.preloadImage(this.backgroundImageUrl(a))}; html2canvas.prototype.loadImage=function(a){a=this.images.indexOf(a);return a!=-1?this.images[a+1]:!1};html2canvas.prototype.preloadImage=function(a){if(this.images.indexOf(a)==-1){this.images.push(a);var b=new Image,c=this;$(b).load(function(){c.imagesLoaded++;c.start()});b.onerror=function(){c.images.splice(c.images.indexOf(b.src),2);c.imagesLoaded++;c.start()};b.src=a;this.images.push(b)}}; -html2canvas.prototype.newText=function(a,b){var c=this.getCSS(a,"font-family"),f=this.getCSS(a,"font-size"),d=this.getCSS(a,"color"),h=this.getCSS(a,"font-weight"),g=this.getCSS(a,"font-style"),e=this.getCSS(a,"text-decoration");b.nodeValue=this.textTransform(b.nodeValue,this.getCSS(a,"text-transform"));var i=b.nodeValue;if(i.length>0){switch(h){case "401":h="bold"}this.ctx.font=h+" "+g+" "+f+" "+c;this.ctx.fillStyle=d;c=b;for(f=0;f0){switch(h){case "401":h="bold"}if(f!="none")var m=this.fontMetrics(c,e);this.ctx.font=h+" "+g+" "+e+" "+c;this.ctx.fillStyle=d;c=b;for(e=0;e-1)return this.fontData[c+1];c=document.createElement("div");document.getElementsByTagName("body")[0].appendChild(c);$(c).css({visibility:"hidden",fontFamily:a,fontSize:b,margin:0,padding:0});var e=document.createElement("img");e.src="http://html2canvas.hertzen.com/images/8.jpg";e.width=1;e.height=1;$(e).css({margin:0,padding:0});var d=document.createElement("span");$(d).css({fontFamily:a,fontSize:b,margin:0, +padding:0});d.appendChild(document.createTextNode("Hidden Text"));c.appendChild(d);c.appendChild(e);var h=e.offsetTop-d.offsetTop+1;c.removeChild(d);c.appendChild(document.createTextNode("Hidden Text"));$(c).css("line-height","normal");$(e).css("vertical-align","super");e={baseline:h,lineWidth:1,middle:e.offsetTop-c.offsetTop+1};this.fontData.push(a+"-"+b);this.fontData.push(e);$(c).remove();return e}; +html2canvas.prototype.textTransform=function(a,b){switch(b){case "lowercase":return a.toLowerCase();case "capitalize":return a.replace(/(^|\s|:|-|\(|\))([a-z])/g,function(a,b,d){return b+d.toUpperCase()});case "uppercase":return a.toUpperCase();default:return a}};html2canvas.prototype.trim=function(a){return a.replace(/^\s*/,"").replace(/\s*$/,"")};html2canvas.prototype.parseElement=function(a){var b=this;this.each(a.children,function(a,e){b.parsing(e)});this.finish()}; +html2canvas.prototype.parsing=function(a){var b=this;if(!RegExp("("+this.ignoreElements+")").test(a.nodeName)){this.newElement(a);var c=$(a).contents();c.length==1?c[0].nodeType==1?this.parsing(c[0]):c[0].nodeType==3&&this.newText(a,c[0]):this.each(c,function(c,d){d.nodeType==1?b.parsing(d):d.nodeType==3&&b.newText(a,d)})}};html2canvas.prototype.log=function(){}; html2canvas.prototype.getBounds=function(a){window.scroll(0,0);if(a.getBoundingClientRect)return a=a.getBoundingClientRect(),a.top=a.top,a.left=a.left,a;else{var b=$(a).offset();return{left:b.left+parseInt(this.getCSS(a,"border-left-width"),10),top:b.top+parseInt(this.getCSS(a,"border-top-width"),10),width:$(a).innerWidth(),height:$(a).innerHeight()}}};html2canvas.prototype.each=function(a,b){for(var b=b||function(){},c=0;c-1){ + return this.fontData[findMetrics+1]; + } + + var container = document.createElement('div'); + document.getElementsByTagName('body')[0].appendChild(container); + + // jquery to speed this up, TODO remove jquery dependancy + $(container).css({ + visibility:'hidden', + fontFamily:font, + fontSize:fontSize, + margin:0, + padding:0 + }); + + + + var img = document.createElement('img'); + img.src = "http://html2canvas.hertzen.com/images/8.jpg"; + img.width = 1; + img.height = 1; + + $(img).css({ + margin:0, + padding:0 + }); + var span = document.createElement('span'); + + $(span).css({ + fontFamily:font, + fontSize:fontSize, + margin:0, + padding:0 + }); + + + span.appendChild(document.createTextNode('Hidden Text')); + container.appendChild(span); + container.appendChild(img); + var baseline = (img.offsetTop-span.offsetTop)+1; + + container.removeChild(span); + container.appendChild(document.createTextNode('Hidden Text')); + + $(container).css('line-height','normal'); + $(img).css("vertical-align","super"); + var middle = (img.offsetTop-container.offsetTop)+1; + + var metricsObj = { + baseline: baseline, + lineWidth: 1, + middle: middle + }; + + + this.fontData.push(font+"-"+fontSize); + this.fontData.push(metricsObj); + + $(container).remove(); + + + + return metricsObj; + +} /* - * Function to apply text-transform attribute to text - */ + * Function to apply text-transform attribute to text + */ html2canvas.prototype.textTransform = function(text,transform){ switch(transform){ case "lowercase":