Selectively applying path markers from a simple collection.
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December 19, 2015 03:09
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D3.js Markers
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| <!DOCTYPE html> | |
| <meta charset='utf-8'> | |
| <script src='http://d3js.org/d3.v3.min.js'></script> | |
| <body> | |
| <script> | |
| var data = [ | |
| { id: 0, name: 'circle', path: 'M 0, 0 m -5, 0 a 5,5 0 1,0 10,0 a 5,5 0 1,0 -10,0', viewbox: '-6 -6 12 12' } | |
| , { id: 1, name: 'square', path: 'M 0,0 m -5,-5 L 5,-5 L 5,5 L -5,5 Z', viewbox: '-5 -5 10 10' } | |
| , { id: 2, name: 'arrow', path: 'M 0,0 m -5,-5 L 5,0 L -5,5 Z', viewbox: '-5 -5 10 10' } | |
| , { id: 2, name: 'stub', path: 'M 0,0 m -1,-5 L 1,-5 L 1,5 L -1,5 Z', viewbox: '-1 -5 2 10' } | |
| ] | |
| var color = d3.scale.category10(), | |
| margin = {top: 50, right: 20, bottom: 30, left: 40}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var svg = d3.select('body').append('svg:svg') | |
| .attr('width', width + margin.left + margin.right) | |
| .attr('height', height + margin.top + margin.bottom); | |
| var defs = svg.append('svg:defs') | |
| var paths = svg.append('svg:g') | |
| .attr('id', 'markers') | |
| .attr('transform', 'translate(' + margin.left + ',' + margin.top + ')'); | |
| var marker = defs.selectAll('marker') | |
| .data(data) | |
| .enter() | |
| .append('svg:marker') | |
| .attr('id', function(d){ return 'marker_' + d.name}) | |
| .attr('markerHeight', 5) | |
| .attr('markerWidth', 5) | |
| .attr('markerUnits', 'strokeWidth') | |
| .attr('orient', 'auto') | |
| .attr('refX', 0) | |
| .attr('refY', 0) | |
| .attr('viewBox', function(d){ return d.viewbox }) | |
| .append('svg:path') | |
| .attr('d', function(d){ return d.path }) | |
| .attr('fill', function(d,i) { return color(i)}); | |
| var path = paths.selectAll('path') | |
| .data(data) | |
| .enter() | |
| .append('svg:path') | |
| .attr('d', function(d,i){ return 'M 0,' + (i * 100) + ' L ' + (width - margin.right) + ',' + (i * 100) + '' }) | |
| .attr('stroke', function(d,i) { return color(i)}) | |
| .attr('stroke-width', 5) | |
| .attr('stroke-linecap', 'round') | |
| .attr('marker-start', function(d,i){ return 'url(#marker_' + d.name + ')' }) | |
| .attr('marker-end', function(d,i){ return 'url(#marker_' + d.name + ')' }) | |
| </script> | |
| </body> |
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