Created
November 15, 2012 16:13
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SVG line markers
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<title>SVG Swarm</title> | |
<style> | |
svg { | |
position: absolute; | |
top: 0; | |
} | |
path { | |
stroke:#000; | |
stroke-width:2; | |
} | |
</style> | |
<div id="fps">FPS: <span>?</span></div> | |
<script src="http://d3js.org/d3.v2.min.js?2.9.1"></script> | |
<script> | |
var data = [[0.5,0.2],[0.6,0.8]]; | |
var width = 960, | |
height = 500; | |
var x = d3.scale.linear() | |
.domain([0, 1]) | |
.range([0, width]); | |
var y = d3.scale.linear() | |
.domain([0, 1]) | |
.range([0, height]); | |
var time0 = Date.now(), | |
time1; | |
var fps = d3.select("#fps span"); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
var marker = svg.append('defs') | |
.append('marker').attr('id', 'arrow') | |
.attr('viewBox', '0 0 10 10') | |
.attr('refX', 1) | |
.attr('refY', 5) | |
.attr('markerWidth', 6) | |
.attr('markerHeight', 6) | |
.attr('orient', 'auto'); | |
marker.append('path') | |
.attr("d", 'M 0 0 L 10 5 L 0 10 z'); | |
var p = svg.selectAll('path.x') | |
.data([data]) | |
.enter() | |
.append("path").attr('class', 'x') | |
.attr('marker-start', 'url(#arrow)') | |
.attr('marker-mid', 'url(#arrow)') | |
.attr('marker-end', 'url(#arrow)') | |
.attr("d", function(d) { | |
return 'M' + d.map(function(a) { | |
return [x(a[0]), y(a[1])]; | |
}).join('L'); | |
}); | |
var fpsqueue = []; | |
var forward = true; | |
/* | |
d3.timer(function() { | |
/*jjj | |
if (forward) { | |
data[1][0] += 0.01; | |
data[0][0] += 0.01; | |
} else { | |
data[1][0] -= 0.01; | |
data[0][0] -= 0.01; | |
} | |
if (data[1][0] > 1) forward = false; | |
if (data[1][0] < 0) forward = true; | |
p.attr("d", function(d) { | |
return 'M' + d.map(function(a) { | |
return [x(a[0]), y(a[1])]; | |
}).join('L'); | |
}); | |
time1 = Date.now(); | |
if (fpsqueue.length === 200) { fps.text(d3.mean(fpsqueue).toFixed(3)); fpsqueue = []; } | |
fpsqueue.push(Math.round(1000 / (time1 - time0))); | |
time0 = time1; | |
}); | |
*/ | |
</script> |
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