Created
October 24, 2013 13:27
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<title>Vector Playground</title> | |
<meta http-equiv='content-type' content='text/html; charset=utf-8' /> | |
<meta name='viewport' content='initial-scale=1.0 maximum-scale=1.0'> | |
<style> | |
g.source-0 path { | |
stroke:red; | |
} | |
g.source-0 circle { | |
fill:red; | |
} | |
g.source-1 path { | |
stroke:blue; | |
} | |
g.source-1 circle { | |
fill:blue; | |
} | |
.result { | |
stroke:green; | |
} | |
path { | |
stroke-width:5; | |
} | |
</style> | |
</head> | |
<body> | |
<div> | |
<strong style='color:red'>a</strong> | |
<select id='op'> | |
<option value='add'>add</option> | |
<option value='subtract'>subtract</option> | |
</select> | |
<strong style='color:blue'>b</strong> | |
</div> | |
<script src='http://d3js.org/d3.v3.min.js'></script> | |
<script src='playground.js'></script> | |
</body> | |
</html> |
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var width = 300, | |
height = 300, | |
margin = 10; | |
var svg = d3.select('body') | |
.append('svg') | |
.attr('width', width) | |
.attr('height', height); | |
var x = d3.scale.linear() | |
.range([margin, width - margin]) | |
.domain([-1, 1]) | |
.clamp(true); | |
var y = d3.scale.linear() | |
.range([margin, height - margin]) | |
.domain([-1, 1]) | |
.clamp(true); | |
var sources = [ | |
[[0, 0], [0, 0.1]], | |
[[0, 0], [0.4, 0]] | |
]; | |
var line = d3.svg.line() | |
.x(function(d) { | |
return x(d[0]); | |
}) | |
.y(function(d) { | |
return y(d[1]); | |
}); | |
var resultpath = svg.append('path') | |
.attr('class', 'result'); | |
var sourceg = svg.selectAll('g.source') | |
.data(sources); | |
var sourcegEnter = sourceg.enter() | |
.append('g') | |
.attr('class', function(d, i) { | |
return 'source source-' + i; | |
}); | |
var sourcepath = sourcegEnter.append('path'); | |
var dragbehavior = d3.behavior.drag() | |
.on('drag', function() { | |
this.__data__[0] = x.invert(d3.event.x); | |
this.__data__[1] = y.invert(d3.event.y); | |
movesources(); | |
}); | |
var sourcehandles = sourcegEnter | |
.selectAll('circle') | |
.data(function(d) { return [d[1]]; }) | |
.enter() | |
.append('circle') | |
.attr('r', 8) | |
.each(function(d, i) { | |
d3.select(this).call(dragbehavior); | |
}); | |
var operations = { | |
add: add, | |
subtract: subtract | |
}; | |
d3.select('#op').on('change', movesources); | |
movesources(); | |
function movesources() { | |
var resultdata = operations[getoperation()](sources[0][1], sources[1][1]); | |
sourcepath.attr('d', line); | |
resultpath.datum([[0, 0], resultdata]).attr('d', line); | |
sourcehandles.attr('transform', function(d) { | |
return 'translate(' + [x(d[0]), y(d[1])] + ')'; | |
}); | |
} | |
function add(a, b) { | |
return [ | |
a[0] + b[0], | |
a[1] + b[1] | |
]; | |
} | |
function subtract(a, b) { | |
return [ | |
a[0] - b[0], | |
a[1] - b[1] | |
]; | |
} | |
function getoperation() { | |
return d3.select('#op').node().value; | |
} |
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