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我们正在使用的平行坐标绘图和绘图数据可以在here找到。此平行坐标图不适用于d3的第4版。我们根据从v3到v4的API更改进行了更改。我认为主要问题在于下面显示的刷子功能。D3 v4平行坐标绘图笔刷选择
function brush() {
let actives = dimensions.filter(function (p) {
return d3.brushSelection(y[p]) !== null;
});
console.log(actives);
let extents = actives.map(function (p) {
return d3.brushSelection(y[p]);
});
foreground.style("display", function (d) {
return actives.every(function (p, i) {
return extents[i][0] <= d[p] && d[p] <= extents[i][1];
}) ? null : "none";
});
}
该日志显示“Array []”为活动项。目前，我们将每个维度的笔刷范围设置为[[-8,0]，[8，height]]，这也可能是一个问题。完整的代码在下面提供。
<!DOCTYPE html>
<meta charset="utf-8">
<style>
svg {
font: 10px sans-serif;
}
.background path {
fill: none;
stroke: #ddd;
shape-rendering: crispEdges;
}
.foreground path {
fill: none;
stroke: steelblue;
}
.brush .extent {
fill-opacity: .3;
stroke: #fff;
shape-rendering: crispEdges;
}
.axis line,
.axis path {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.axis text {
text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, 0 -1px 0 #fff, -1px 0 0 #fff;
cursor: move;
}
</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
let margin = {top: 30, right: 10, bottom: 10, left: 10},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
let x = d3.scalePoint().range([0, width]).padding(1),
y = {},
dragging = {};
let line = d3.line(),
axis = d3.axisLeft(), //Argument for axisLeft? Compare to code on original plot
background,
foreground;
let svg = d3.select("body").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 + ")");
d3.csv("cars.csv", function (error, cars) {
// Extract the list of dimensions and create a scale for each.
x.domain(dimensions = d3.keys(cars[0]).filter(function (d) {
return d !== "name" && (y[d] = d3.scaleLinear()
.domain(d3.extent(cars, function (p) {
return +p[d];
}))
.range([height, 0]));
}));
// Add grey background lines for context.
background = svg.append("g")
.attr("class", "background")
.selectAll("path")
.data(cars)
.enter().append("path")
.attr("d", path);
// Add blue foreground lines for focus.
foreground = svg.append("g")
.attr("class", "foreground")
.selectAll("path")
.data(cars)
.enter().append("path")
.attr("d", path);
// Add a group element for each dimension.
let g = svg.selectAll(".dimension")
.data(dimensions)
.enter().append("g")
.attr("class", "dimension")
.attr("transform", function (d) {
return "translate(" + x(d) + ")";
})
.call(d3.drag()
.subject(function (d) {
return {x: x(d)};
})
.on("start", function (d) {
dragging[d] = x(d);
background.attr("visibility", "hidden");
})
.on("drag", function (d) {
dragging[d] = Math.min(width, Math.max(0, d3.event.x));
foreground.attr("d", path);
dimensions.sort(function (a, b) {
return position(a) - position(b);
});
x.domain(dimensions);
g.attr("transform", function (d) {
return "translate(" + position(d) + ")";
})
})
.on("end", function (d) {
delete dragging[d];
transition(d3.select(this)).attr("transform", "translate(" + x(d) + ")");
transition(foreground).attr("d", path);
background
.attr("d", path)
.transition()
.delay(500)
.duration(0)
.attr("visibility", null);
}));
// Add an axis and title.
g.append("g")
.attr("class", "axis")
.each(function (d) {
d3.select(this).call(axis.scale(y[d]));
})
.append("text")
.style("text-anchor", "middle")
.attr("y", -9)
.text(function (d) {
return d;
});
// Add and store a brush for each axis.
g.append("g")
.attr("class", "brush")
.each(function (d) {
d3.select(this).call(y[d].brush = d3.brushY().extent([[-8,0],[8,height]]).on("start", brushstart).on("brush", brush));
})
.selectAll("rect")
.attr("x", -8)
.attr("width", 16);
});
function position(d) {
let v = dragging[d];
return v == null ? x(d) : v;
}
function transition(g) {
return g.transition().duration(500);
}
// Returns the path for a given data point.
function path(d) {
return line(dimensions.map(function (p) {
return [position(p), y[p](d[p])];
}));
}
function brushstart() {
d3.event.sourceEvent.stopPropagation();
}
// Handles a brush event, toggling the display of foreground lines.
function brush() {
//return !y[p].brush.empty was the original return value.
let actives = dimensions.filter(function (p) {
return d3.brushSelection(y[p]) !== null;
});
console.log(actives);
let extents = actives.map(function (p) {
return d3.brushSelection(y[p]);
});
foreground.style("display", function (d) {
return actives.every(function (p, i) {
return extents[i][0] <= d[p] && d[p] <= extents[i][1];
}) ? null : "none";
});
}
</script>
如果有人熟悉d3并可以提供任何指导，将不胜感激。我们也尝试在画笔函数中使用d3.event.selection和y [p] .brush.selection。
你是谁的情节不工作？它是否绘制了阴谋？它是否给你任何错误？ – jrogers12