How to set color of each line or width in SVG path

Question

I use the path to create a triangle,

svg.append("path").attr("d","M " + x(0) + "," + y(0) + " L " + x(1) + "," + y(1) + " " + x(-1) + "," + y(1) + " " + x(0) + "," + y(0) ).style({
    stroke: 'black',
    'stroke-width': 1,
    fill: 'red'
});

How to set the color or stroke width for each line?

thanks.

Answer 1

As @Lars said, you need to use separate path elements. In addition, you can use the line generator, so you do not need to manually create path lines.

var data = [
    {p: [{x: 100, y: 100}, {x: 200, y: 100}], w: 2, c: 'red'},
    {p: [{x: 100, y: 100}, {x: 150, y: 200}], w: 3, c: 'blue'},
    {p: [{x: 150, y: 200}, {x: 200, y: 100}], w: 1, c: 'green'}
];

// Line generator
var line = d3.svg.line()
    .x(function(d) { return d.x; })
    .y(function(d) { return d.y; });

svg.selectAll('path')
   .data(data)
   .enter().append('path')
   .attr('d', function(d) { return line(d.p); })
   .attr('stroke-width', function(d) { return d.w; })
   .attr('stroke', function(d) { return d.c; });

I wrote a little fiddle here: http://jsfiddle.net/pnavarrc/9Qqy8/