SVG到d3.js的画布 [英] SVG to Canvas with d3.js
问题描述
有没有人尝试在创建d3.js可视化时使用svg到canvas库?我试图使用canvg.js和d3.js从Android 2.3应用程序webview中转换svg到画布,但是当我调用:
svg.selectAll(。axis)
.data(d3.range(angle.domain()[1]))
.enter
.attr(class,axis)
.attr(transform,function(d){returnrotate(+ angle(d)* 180 / Math.PI + ;})
.call(d3.svg.axis()
.scale(radius.copy()。range([ - 5,-outerRadius]))
.ticks )
.orient(left))
.append(text)
.attr(y,
function(d){
if window.innerWidth <455){
console.log(innerWidth less than 455:,window.innerWidth);
return - (window.innerHeight * .33);
}
else {
console.log(innerWidth greater than 455:,window.innerWidth);
return - (window.innerHeight * .33);
}
})
.attr(dy,.71em)
.attr(text-anchor,middle)
.text capitalMeta [i]; })
.attr(style,font-size:12px;);
我收到错误:Uncaught TypeError:无法调用方法'setProperty'null http://mbostock.github.com/d3/d3.js?2.5.0:1707
会是某种无头的浏览器应用程序,还是服务器端的js解析器工作?有没有人遇到过这个?
这里有一种方法可以将svg写入画布或任何):
//创建导出按钮
d3.select(body)
.append(button)
.html(Export)
.on(click,svgToCanvas);
var w = 100,//或任何你的svg宽度是
h = 100;
//创建导出函数 - 这将导出
//它找到的第一个svg元素
function svgToCanvas(){
//选择第一个svg元素
var svg = d3.select(svg)[0] [0],
img = new Image(),
serializer = new XMLSerializer(),
svgStr = serializer.serializeToString(svg);
img.src ='data:image / svg + xml; base64,'+ window.btoa(svgStr);
//你也可以使用没有base64编码的实际字符串:
//img.src =data:image / svg + xml; utf8,+ svgStr;
var canvas = document.createElement(canvas);
document.body.appendChild(canvas);
canvas.width = w;
canvas.height = h;
canvas.getContext(2d)。drawImage(img,0,0,w,h);
//现在保存为png或任何
};
Has anyone tried using a svg to canvas library when creating d3.js visualizations? I've tried to use canvg.js and d3.js to convert svg to canvas from within an android 2.3 application webview, but when I call:
svg.selectAll(".axis")
.data(d3.range(angle.domain()[1]))
.enter().append("g")
.attr("class", "axis")
.attr("transform", function(d) { return "rotate(" + angle(d) * 180 / Math.PI + ")"; })
.call(d3.svg.axis()
.scale(radius.copy().range([-5, -outerRadius]))
.ticks(5)
.orient("left"))
.append("text")
.attr("y",
function (d) {
if (window.innerWidth < 455){
console.log("innerWidth less than 455: ",window.innerWidth);
return -(window.innerHeight * .33);
}
else{
console.log("innerWidth greater than 455: ",window.innerWidth);
return -(window.innerHeight * .33);
}
})
.attr("dy", ".71em")
.attr("text-anchor", "middle")
.text(function(d, i) { return capitalMeta[i]; })
.attr("style","font-size:12px;");
I get the error: Uncaught TypeError: Cannot call method 'setProperty' of null http://mbostock.github.com/d3/d3.js?2.5.0:1707
Would some sort of headless browser application, or a server side js parser work? Has anyone encountered this before?
Here's one way you could write your svg to canvas (and then save the result as a png or whatever):
// Create an export button
d3.select("body")
.append("button")
.html("Export")
.on("click",svgToCanvas);
var w = 100, // or whatever your svg width is
h = 100;
// Create the export function - this will just export
// the first svg element it finds
function svgToCanvas(){
// Select the first svg element
var svg = d3.select("svg")[0][0],
img = new Image(),
serializer = new XMLSerializer(),
svgStr = serializer.serializeToString(svg);
img.src = 'data:image/svg+xml;base64,'+window.btoa(svgStr);
// You could also use the actual string without base64 encoding it:
//img.src = "data:image/svg+xml;utf8," + svgStr;
var canvas = document.createElement("canvas");
document.body.appendChild(canvas);
canvas.width = w;
canvas.height = h;
canvas.getContext("2d").drawImage(img,0,0,w,h);
// Now save as png or whatever
};
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