示例地址: TextToImage,仅作大家交流使用。
附加_2012年4月18日11:13:00:之前刚分享此代码的时候的版本是不能处理分行的,现在可以了。在做断行的过程,我发现:一个好算法,是胜过无数行苦逼的杂乱代码的...
附加_2012年4月18日11:13:00:之前刚分享此代码的时候的版本是不能处理分行的,现在可以了。在做断行的过程,我发现:一个好算法,是胜过无数行苦逼的杂乱代码的...
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2. [代码][HTML]代码
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< html > < head > < script type = "text/javascript" > function $(id) { return document.getElementById(id); } function textToImg() { var len = $('len').value || 30; var i = 0; var fontSize = $('fontSize').value || 15; var fontWeight = $('fontWeight').value || 'normal'; var txt = $("txt").value; var canvas = $('canvas'); if (txt == '') { alert('请输入文字!'); $("txt").focus(); } if (len > txt.length) { len = txt.length; } canvas.width = fontSize * len; canvas.height = fontSize * (3 / 2) * (Math.ceil(txt.length / len) + txt.split('
').length - 1); var context = canvas.getContext('2d'); context.clearRect(0, 0, canvas.width, canvas.height); context.fillStyle = $("showcolor").innerHTML; context.font = fontWeight + ' ' + fontSize + 'px sans-serif'; context.textBaseline = 'top'; canvas.style.display = 'none'; console.log(txt.length); function fillTxt(text) { while (text.length > len) { var txtLine = text.substring(0, len); text = text.substring(len); context.fillText(txtLine, 0, fontSize * (3 / 2) * i++, canvas.width); } context.fillText(text, 0, fontSize * (3 / 2) * i, canvas.width); } var txtArray = txt.split('
'); for ( var j = 0; j < txtArray.length ; j++) { fillTxt(txtArray[j]); context.fillText('
', 0, fontSize * (3 / 2) * i++, canvas.width); } var imageData = context .getImageData(0, 0, canvas.width, canvas.height); var img = $("img"); img.src = canvas .toDataURL("image/png"); } function changeColor() { var c = $("text"); var ctx = c.getContext("2d"); var red = $("red"); var green = $("green"); var blue = $("blue"); ctx.fillStyle = "rgb(" + red.value + "," + green.value + "," + blue.value + ")"; $("showcolor") .innerHTML = ctx .fillStyle; ctx.fillRect(0, 0, 100, 100); //$('canvas').getContext('2d').fillStyle=$("showcolor").innerHTML; } </script> </ head > < body > < div style = "float: left" >< textarea id = "txt" style = " 450px; height: 400px;" >如果您的长微博字数超过了140个字的限制,在这里输入微博内容,点击右方的“生成图片”,鼠标右击右边“文字”,“图片另存为...”,保存图片后,就可以直接发到微博里了,赶紧试试吧!</ textarea ></ div > < div style = " 200px; height: 100px; float: left; clear: right" > < table > < tr > < td >< label >字体大小:</ label >< input size = "4" id = 'fontSize' value = '15' />px</ td > </ tr > < tr > < td >< label >字体精细:</ label >< select id = "fontWeight" > < option value = "normal" >正常</ option > < option value = "bold" >粗</ option > </ select ></ td > </ tr > < tr > < td >< label >每行显示:</ label >< input size = "4" id = 'len' value = "40" />个字</ td > </ tr > < tr > < td >< canvas id = "text" width = "100" height = "100" ></ canvas > < p >Red: < input type = "range" id = "red" min = "0" max = "255" value = "0" onchange = "changeColor();" /></ p > < p >Green:< input type = "range" id = "green" min = "0" max = "255" value = "0" onchange = "changeColor();" /></ p > < p >Blue: < input type = "range" id = "blue" min = "0" max = "255" value = "0" onchange = "changeColor();" /></ p > 目前的颜色:< span id = "showcolor" ></ span ></ td > </ tr > < tr > < td > < button onclick = textToImg ();; >生成图片</ button > </ td > </ tr > </ table > </ div > < canvas id = "canvas" style = "display:block" ></ canvas > < div style = "margin-left: 650px" >< img id = "img" style = "border: 1px solid" /></ div > < script > changeColor(); </ script > </ body > |