I have the following simple example, When the line extends outside the rectangle, I want to clip it. I already have the rectangle used as an outline, what is a simple way to the same rectangle as a clipping path? My current approach using id is ignored. This related question has an answer but it requires creating the clip area separately. I'd like to re-use my info rather than repeat nearly the same info.
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src = "http://d3js.org/d3.v3.min.js"> </script>
<script>
var margin = {top: 100, right: 20, bottom: 20, left: 20},
width = 600 - margin.left - margin.right,
height = 270 - margin.top - margin.bottom;
var xdata = d3.range(0, 20);
var ydata = [1, 4, 5, 9, 10, 14, 15, 15, 11, 10, 5, 5, 4, 8, 7, 5, 5, 5, 8, 10];
var xy = []; // start empty, add each element one at a time
for(var i = 0; i < xdata.length; i++ ) {
xy.push({x: xdata[i], y: ydata[i]});
}
var xscl = d3.scale.linear()
.domain(d3.extent(xy, function(d) {return d.x;})) //use just the x part
.range([margin.left, width + margin.left])
var yscl = d3.scale.linear()
.domain([1, 8]) // use just the y part
.range([height + margin.top, margin.top])
var slice = d3.svg.line()
.x(function(d) { return xscl(d.x);}) // apply the x scale to the x data
.y(function(d) { return yscl(d.y);}) // apply the y scale to the y data
var svg = d3.select("body")
.append("svg")
svg.append('rect') // outline for reference
.attr({x: margin.left, y: margin.top,
width: width,
height: height,
id: "xSliceBox",
stroke: 'black',
'stroke-width': 0.5,
fill:'white'});
svg.append("path")
.attr("class", "line")
.attr("d", slice(xy))
.attr("clip-path", "#xSliceBox")
.style("fill", "none")
.style("stroke", "red")
.style("stroke-width", 2);
</script>
</body>
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