我正在尝试使用渐进式渲染来制作平行坐标，类似于此示例https://bl.ocks.org/syntagmatic/05a5b0897a48890133beb59c815bd953
我制作了一个更简单的版本http://plnkr.co/edit/62aXey7lSqvaAJ0R7Kwv?p=preview。有没有办法让我们可以在轴上进行多项选择，例如在同一列1轴上刷0.1到0.3并再次刷0.6到0.8，同样适用于其他轴。
我尝试修改代码中的actives数组，但似乎每个轴只需要一个刷牙区域。
请随时要求澄清。 任何帮助将受到高度赞赏。 感谢
<!DOCTYPE html>
<meta charset="utf-8">
<title>Nutrient Parallel Coordinates IV</title>
<style>
body {
min-width: 760px;
}
.parcoords {
display: block;
}
.parcoords svg,
.parcoords canvas {
font: 10px sans-serif;
position: absolute;
}
.parcoords canvas {
opacity: 0.9;
pointer-events: none;
}
.axis .title {
font-size: 10px;
transform: rotate(-21deg) translate(-5px,-6px);
fill: #222;
}
.axis line,
.axis path {
fill: none;
stroke: #ccc;
stroke-width: 1px;
}
.axis .tick text {
fill: #222;
pointer-events: none;
}
.axis.pl_facility .tick text,
.axis.pl_instrument .tick text,
.axis.st_spstr .tick text {
font-size: 6px;
}
.axis.pl_telescope .tick text {
font-size: 5px;
}
.axis:hover line,
.axis:hover path,
.axis.active line,
.axis.active path {
fill: none;
stroke: #222;
stroke-width: 1px;
}
.axis:hover .title {
font-weight: bold;
}
.axis:hover .tick text {
opacity: 1;
}
.axis.active .title {
font-weight: bold;
}
.axis.active .tick text {
opacity: 1;
font-weight: bold;
}
.brush .extent {
fill-opacity: .3;
stroke: #fff;
stroke-width: 1px;
}
pre {
width: 100%;
height: 300px;
margin: 6px 12px;
tab-size: 40;
font-size: 10px;
overflow: auto;
}
</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var renderQueue = (function(func) {
var _queue = [], // data to be rendered
_rate = 1000, // number of calls per frame
_invalidate = function() {}, // invalidate last render queue
_clear = function() {}; // clearing function
var rq = function(data) {
if (data) rq.data(data);
_invalidate();
_clear();
rq.render();
};
rq.render = function() {
var valid = true;
_invalidate = rq.invalidate = function() {
valid = false;
};
function doFrame() {
if (!valid) return true;
var chunk = _queue.splice(0,_rate);
chunk.map(func);
timer_frame(doFrame);
}
doFrame();
};
rq.data = function(data) {
_invalidate();
_queue = data.slice(0); // creates a copy of the data
return rq;
};
rq.add = function(data) {
_queue = _queue.concat(data);
};
rq.rate = function(value) {
if (!arguments.length) return _rate;
_rate = value;
return rq;
};
rq.remaining = function() {
return _queue.length;
};
// clear the canvas
rq.clear = function(func) {
if (!arguments.length) {
_clear();
return rq;
}
_clear = func;
return rq;
};
rq.invalidate = _invalidate;
var timer_frame = window.requestAnimationFrame
|| window.webkitRequestAnimationFrame
|| window.mozRequestAnimationFrame
|| window.oRequestAnimationFrame
|| window.msRequestAnimationFrame
|| function(callback) { setTimeout(callback, 17); };
return rq;
});
</script>
<script>
var temp = [];
var actives_test = [];
var margin = {top: 66, right: 110, bottom: 20, left: 188},
width = document.body.clientWidth - margin.left - margin.right,
height = 340 - margin.top - margin.bottom,
innerHeight = height - 2;
var devicePixelRatio = window.devicePixelRatio || 1;
var color = d3.scaleOrdinal()
.domain(["Radial Velocity", "Imaging", "Eclipse Timing Variations", "Astrometry", "Microlensing", "Orbital Brightness Modulation", "Pulsar Timing", "Pulsation Timing Variations", "Transit", "Transit Timing Variations"])
.range(["#DB7F85", "#50AB84", "#4C6C86", "#C47DCB", "#B59248", "#DD6CA7", "#E15E5A", "#5DA5B3", "#725D82", "#54AF52", "#954D56", "#8C92E8", "#D8597D", "#AB9C27", "#D67D4B", "#D58323", "#BA89AD", "#357468", "#8F86C2", "#7D9E33", "#517C3F", "#9D5130", "#5E9ACF", "#776327", "#944F7E"]);
var types = {
"Number": {
key: "Number",
coerce: function(d) { return +d; },
extent: d3.extent,
within: function(d, extent, dim) { return extent[0] <= dim.scale(d) && dim.scale(d) <= extent[1]; },
defaultScale: d3.scaleLinear().range([innerHeight, 0])
},
"String": {
key: "String",
coerce: String,
extent: function (data) { return data.sort(); },
within: function(d, extent, dim) { return extent[0] <= dim.scale(d) && dim.scale(d) <= extent[1]; },
defaultScale: d3.scalePoint().range([0, innerHeight])
},
"Date": {
key: "Date",
coerce: function(d) { return new Date(d); },
extent: d3.extent,
within: function(d, extent, dim) { return extent[0] <= dim.scale(d) && dim.scale(d) <= extent[1]; },
defaultScale: d3.scaleTime().range([innerHeight, 0])
}
};
var dimensions = [
{
key: "column1",
type: types["Number"],
scale: d3.scaleSqrt().range([innerHeight, 0])
},
{
key: "column2",
// description: "Food ",
type: types["String"],
axis: d3.axisLeft()
.tickFormat(function(d,i) {
return d;
})
},
{
key: "column3",
type: types["Number"],
scale: d3.scaleSqrt().range([innerHeight, 0])
},
{
key: "column4",
// description: "Food Group",
type: types["String"],
axis: d3.axisLeft()
.tickFormat(function(d,i) {
return d;
})
},
{
key: "column5",
type: types["Number"],
scale: d3.scaleSqrt().range([innerHeight, 0])
},
{
key: "column6",
//description: "Food Group",
type: types["String"],
axis: d3.axisLeft()
.tickFormat(function(d,i) {
return d;
})
},
{
key: "column7",
//description: "Food Group",
type: types["String"],
axis: d3.axisLeft()
.tickFormat(function(d,i) {
return d;
})
},
];
var xscale = d3.scalePoint()
.domain(d3.range(dimensions.length))
.range([0, width]);
var yAxis = d3.axisLeft();
var container = d3.select("body").append("div")
.attr("class", "parcoords")
.style("width", width + margin.left + margin.right + "px")
.style("height", height + margin.top + margin.bottom + "px");
var svg = container.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var canvas = container.append("canvas")
.attr("width", width * devicePixelRatio)
.attr("height", height * devicePixelRatio)
.style("width", width + "px")
.style("height", height + "px")
.style("margin-top", margin.top + "px")
.style("margin-left", margin.left + "px");
var ctx = canvas.node().getContext("2d");
ctx.globalCompositeOperation = 'darken';
ctx.globalAlpha = 0.15;
ctx.lineWidth = 1.5;
ctx.scale(devicePixelRatio, devicePixelRatio);
//var output = d3.select("body").append("pre");
var axes = svg.selectAll(".axis")
.data(dimensions)
.enter().append("g")
.attr("class", function(d) { return "axis " + d.key.replace(/ /g, "_"); })
.attr("transform", function(d,i) { return "translate(" + xscale(i) + ")"; });
d3.csv("data.csv", function(error, data) {
if (error) throw error;
data.forEach(function(d) {
dimensions.forEach(function(p) {
d[p.key] = !d[p.key] ? null : p.type.coerce(d[p.key]);
});
// truncate long text strings to fit in data table
for (var key in d) {
if (d[key] && d[key].length > 35) d[key] = d[key].slice(0,36);
}
});
// type/dimension default setting happens here
dimensions.forEach(function(dim) {
if (!("domain" in dim)) {
// detect domain using dimension type's extent function
dim.domain = d3_functor(dim.type.extent)(data.map(function(d) { return d[dim.key]; }));
}
if (!("scale" in dim)) {
// use type's default scale for dimension
dim.scale = dim.type.defaultScale.copy();
}
dim.scale.domain(dim.domain);
});
var render = renderQueue(draw).rate(30);
ctx.clearRect(0,0,width,height);
ctx.globalAlpha = d3.min([1.15/Math.pow(data.length,0.3),1]);
render(data);
axes.append("g")
.each(function(d) {
var renderAxis = "axis" in d
? d.axis.scale(d.scale) // custom axis
: yAxis.scale(d.scale); // default axis
d3.select(this).call(renderAxis);
})
.append("text")
.attr("class", "title")
.attr("text-anchor", "start")
.text(function(d) { return "description" in d ? d.description : d.key; });
// Add and store a brush for each axis.
axes.append("g")
.attr("class", "brush")
.each(function(d) {
d3.select(this).call(d.brush = d3.brushY()
.extent([[-10,0], [10,height]])
.on("start", brushstart)
.on("brush", brush)
.on("end", brush)
)
})
.selectAll("rect")
.attr("x", -8)
.attr("width", 16);
d3.selectAll(".axis.pl_discmethod .tick text")
.style("fill", color);
//output.text(d3.tsvFormat(data.slice(0,24)));
function project(d) {
return dimensions.map(function(p,i) {
// check if data element has property and contains a value
if (
!(p.key in d) ||
d[p.key] === null
) return null;
return [xscale(i),p.scale(d[p.key])];
});
};
function draw(d) {
ctx.strokeStyle = color(d.pl_discmethod);
ctx.beginPath();
var coords = project(d);
coords.forEach(function(p,i) {
// this tricky bit avoids rendering null values as 0
if (p === null) {
// this bit renders horizontal lines on the previous/next
// dimensions, so that sandwiched null values are visible
if (i > 0) {
var prev = coords[i-1];
if (prev !== null) {
ctx.moveTo(prev[0],prev[1]);
ctx.lineTo(prev[0]+6,prev[1]);
}
}
if (i < coords.length-1) {
var next = coords[i+1];
if (next !== null) {
ctx.moveTo(next[0]-6,next[1]);
}
}
return;
}
if (i == 0) {
ctx.moveTo(p[0],p[1]);
return;
}
ctx.lineTo(p[0],p[1]);
});
ctx.stroke();
}
function brushstart() {
d3.event.sourceEvent.stopPropagation();
}
// Handles a brush event, toggling the display of foreground lines.
function brush() {
render.invalidate();
console.log("brushing");
var actives = [];
svg.selectAll(".axis .brush")
.filter(function(d) {
return d3.brushSelection(this);
})
.each(function(d) {
// console.log("d", d);
temp.push(d);
actives.push({
dimension: d,
extent: d3.brushSelection(this)
});
});
console.log("actives", actives);
var selected = data.filter(function(d) {
if (actives.every(function(active) {
var dim = active.dimension;
// test if point is within extents for each active brush
return dim.type.within(d[dim.key], active.extent, dim);
})) {
return true;
}
});
// show ticks for active brush dimensions
// and filter ticks to only those within brush extents
/*
svg.selectAll(".axis")
.filter(function(d) {
return actives.indexOf(d) > -1 ? true : false;
})
.classed("active", true)
.each(function(dimension, i) {
var extent = extents[i];
d3.select(this)
.selectAll(".tick text")
.style("display", function(d) {
var value = dimension.type.coerce(d);
return dimension.type.within(value, extent, dimension) ? null : "none";
});
});
// reset dimensions without active brushes
svg.selectAll(".axis")
.filter(function(d) {
return actives.indexOf(d) > -1 ? false : true;
})
.classed("active", false)
.selectAll(".tick text")
.style("display", null);
*/
ctx.clearRect(0,0,width,height);
ctx.globalAlpha = d3.min([0.85/Math.pow(selected.length,0.3),1]);
render(selected);
//output.text(d3.tsvFormat(selected.slice(0,24)));
}
});
function d3_functor(v) {
return typeof v === "function" ? v : function() { return v; };
};
</script>