d3 v3-同步笔刷缩放和滚动缩放 [英] d3 v3 - sync brush zoom and scroll zoom
问题描述
我试图在同一张图表中添加笔刷缩放和滚动缩放，但是要同步依赖于X和Y的这两者变得有些困难.如何根据轴域计算平移和缩放值?
I'm trying to add brush zoom and scroll zoom within the same chart but for it's getting a bit difficult to sync both which depend on X and Y both. How do I compute the translate and scale values based on the axes domains?
这是我为测试该图表而编写的示例图表:
Here's a sample chart I've written down to test the same:
var margin = {
top: 30,
right: 20,
bottom: 30,
left: 50
};
var width = 600 - margin.left - margin.right;
var height = 270 - margin.top - margin.bottom;
var parseDate = d3.time.format("%d-%b-%y").parse;
var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);
var fullX = x.copy();
var fullY = y.copy();
var xAxis = d3.svg.axis().scale(x)
.orient("bottom").ticks(5);
var yAxis = d3.svg.axis().scale(y)
.orient("left").ticks(5);
var valueline = d3.svg.line()
.x(function (d) {
return x(d.date);
})
.y(function (d) {
return y(d.close);
});
var svg = d3.select("body")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom);
var g = svg
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
// Get the data
var data = [{
date: "1-May-12",
close: "58.13"
}, {
date: "30-Apr-12",
close: "53.98"
}, {
date: "27-Apr-12",
close: "67.00"
}, {
date: "26-Apr-12",
close: "89.70"
}, {
date: "25-Apr-12",
close: "99.00"
}];
data.forEach(function (d) {
d.date = parseDate(d.date);
d.close = +d.close;
});
// Scale the range of the data
x.domain(d3.extent(data, function (d) {
return d.date;
}));
y.domain([0, d3.max(data, function (d) {
return d.close;
})]);
var gBrush = g.append('g').classed('brush', true);
var gAxisX = g.append("g") // Add the X Axis
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
var gAxisY = g.append("g") // Add the Y Axis
.attr("class", "y axis");
function drawAxes() {
gAxisX.call(xAxis);
gAxisY.call(yAxis);
}
drawAxes();
var brushing = false;
var zoom = d3.behavior.zoom().x(x).y(y).scaleExtent([1, 10000])
.on('zoom', function () {
if(brushing && d3.event.sourceEvent.type === 'mousemove' && d3.event.sourceEvent.which !== 2) return ;
drawAxes();
});
svg.call(zoom);
var brush = d3.svg.brush().x(x).y(y)
.on('brushstart', function () {
d3.select(this).select('rect.extent').style('display', null);
})
.on('brush', function () {
brushing = true;
})
.on('brushend', function () {
brushing = false;
d3.select(this).select('rect.extent').style('display', 'none');
var extent = brush.extent();
x.domain([extent[0][0], extent[1][0]]);
y.domain([extent[0][1], extent[1][1]]);
var sx = x.domain(), sy = y.domain();
var k = Math.min((x.range()[1]-x.range()[0]) / (fullX(sx[1]) - fullX(sx[0])), (y.range()[1]-y.range()[0]) / (fullY(sy[1]) - fullY(sy[0]))),
tx = fullX.range()[0] - fullX(sx[0]) * k,
ty = fullY.range()[0] - fullY(sy[0]) * k;
// zoom.translate([tx, ty]).scale(k);
// zoom.x(sy).y(sy); - I don't want to do this to respect scaleExtent to original domains
drawAxes();
});
gBrush.call(brush);
d3.select('#autofit').on('click', function () {
// Scale the range of the data
x.domain(d3.extent(data, function (d) {
return d.date;
}));
y.domain([0, d3.max(data, function (d) {
return d.close;
})]);
drawAxes();
})body {
font: 12px Arial;
}
path {
stroke: steelblue;
stroke-width: 2;
fill: none;
}
.axis path, .axis line {
fill: none;
stroke: grey;
stroke-width: 1;
shape-rendering: crispEdges;
}
rect.extent {
fill: none;
stroke: #ddd;
}<script src="https://d3js.org/d3.v3.min.js"></script>
<button id='autofit'>
Autofit
</button>是的，在v4中有一些与此相关的示例，而我正在尝试在v3中完成此操作.
Yes, there are a few examples related to the same but in v4 and I'm trying to get this done in v3.
参考文献1: D3.js:组合缩放/画笔(v4)
参考文献2: http://bl.ocks.org/nnattawat/9689303 (问题是缩放的x缩放到了新的刷过的缩放，这弄乱了scaleExtent，我想将缩放限制到原始域)
Reference 2: http://bl.ocks.org/nnattawat/9689303 (problem with this is that zoom's x is scaled to the new brushed zoom which messes up the scaleExtent and I would like to restrict the zooming to the original domains)
我苦苦挣扎的台词是:
var k = Math.min((x.range()[1]-x.range()[0]) / (fullX(sx[1]) - fullX(sx[0])), (y.range()[1]-y.range()[0]) / (fullY(sy[1]) - fullY(sy[0]))),
tx = fullX.range()[0] - fullX(sx[0]) * k,
ty = fullY.range()[0] - fullY(sy[0]) * k;
//zoom.translate([tx，ty]).scale(k);
// zoom.translate([tx, ty]).scale(k);
位于刷机功能内部.
基本上尝试基于新域来计算转换和缩放.如果 k 是基于x.range()计算的，则此处使用的逻辑适用于x；如果 k 是根据y.range()计算的，则适用于y.使他们俩一起工作似乎是一场挣扎(Math.min没工作).谢谢.
Basically trying to compute the translate and scale based on the new domains. The logic used there works for x if the k is computed based on x.range() and works for y if k is computed based on y.range() BUT to make them both work together seems to be a struggle (Math.min didn't work). Thank you.
推荐答案
就像Mike在这里提到的那样，似乎无法同时转换X和Y: https://github.com/d3/d3-zoom/issues/48
Looks like there's no way to transform both X and Y at the same time as mentioned by Mike here: https://github.com/d3/d3-zoom/issues/48
P.S.如果您的缩放比例受到限制，即水平或垂直缩放，则可以通过应用适当的比例使两个缩放功能一起使用.
P.S. If you have a restricted zoom i.e. either horizontal or vertical, then you can make both the zoom functions work together by applying appropriate scales.
例如X平移和缩放比例:
For example for X translation and scale:
k_x = (x.range()[1]-x.range()[0]) / (fullX(sx[1]) - fullX(sx[0]));
t_x = fullX.range()[0] - fullX(sx[0]) * k_x
在进行Y轴平移和缩放时，
While for Y axes translation and scale,
k_y = (y.range()[1]-y.range()[0]) / (fullY(sy[1]) - fullY(sy[0])));
ty = fullY.range()[0] - fullY(sy[0]) * k_y;
此问题中提到了一些解决方法，如果有任何解决方法，我将在此处发布.
There are a couple of workarounds mentioned within this issue which I'll be looking into and if anything works out smooth, I'll post it on here.
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