d3.js - Pencil-like functionality -


i've been searching around way use d3 , hand drawn pencil capability. doable? i've looked around different examples on mbostock site, couldn't find allowed manually draw within zoomable area.

i @coolblue's solution here's alternative. uses path element feel drawing:

<!doctype html>  <html>    <head>    <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>  </head>    <body>    <script>      var svg = d3.select('body')        .append('svg')        .attr('width', 1000)        .attr('height', 1000);              var color = d3.scale.category20();            var line = d3.svg.line()          .interpolate("basis");            var drawobj = {        isdown: false,        datapoints: [],        currentpath: null,        color: 0      }            svg.on("mousedown", function(){        drawobj.isdown = true;              });      svg.on("mousemove", function(){        if (drawobj.isdown){          drawobj.datapoints.push(            [d3.event.x, d3.event.y]          );          if (!drawobj.currentpath){            drawobj.currentpath = svg.append("path")              .attr("class","currentpath")              .style("stroke-width", 1)              .style("stroke",color(drawobj.color))              .style("fill", "none");          }          drawobj.currentpath            .datum(drawobj.datapoints)            .attr("d", line);        }      });      svg.on("mouseup", function(){        drawobj.isdown = false;        drawobj.currentpath.attr("class","oldpath");        drawobj.datapoints = [];        drawobj.currentpath = null;        if (++drawobj.color > 19) {          drawobj.color = 0;        }      })    </script>  </body>    </html>

plunker here.


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