d3 v4 带 x 和 y 轴的拖动折线图
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【中文标题】d3 v4 带 x 和 y 轴的拖动折线图【英文标题】:d3 v4 drag line chart with x and y axes 【发布时间】:2017-07-31 22:08:17 【问题描述】:我是 d3.js 的新手。我想用它的点来拖动一个折线图。没有 x 和 y 轴它工作正常。 我用这个例子作为参考:https://bl.ocks.org/mbostock/4342190
对于折线图的轴,该线未正确绘制。请查看下面的 sn-p。
提前致谢。
<!DOCTYPE html>
<svg ></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var svg = d3.select("svg"),
margin = top: 20, right: 20, bottom: 30, left: 50,
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom;
let points = d3.range(1, 10).map(function(i)
return [i * width / 10, 50 + Math.random() * (height - 100)];
);
var x = d3.scaleLinear()
.rangeRound([0, width]);
var y = d3.scaleLinear()
.rangeRound([height, 0]);
var xAxis = d3.axisBottom(x),
yAxis = d3.axisLeft(y);
var line = d3.line()
.x(function(d) return x(d[0]); )
.y(function(d) return y(d[1]); );
let drag = d3.drag()
.on('start', dragstarted)
.on('drag', dragged)
.on('end', dragended);
svg.append('rect')
.attr('class', 'zoom')
.attr('cursor', 'move')
.attr('fill', 'none')
.attr('pointer-events', 'all')
.attr('width', width)
.attr('height', height)
.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')
var focus = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
x.domain(d3.extent(points, function(d) return d[0]; ));
y.domain(d3.extent(points, function(d) return d[1]; ));
focus.append("path")
.datum(points)
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.attr("stroke-width", 1.5)
.attr("d", line);
focus.selectAll('circle')
.data(points)
.enter()
.append('circle')
.attr('r', 5.0)
.attr('cx', function(d) return x(d[0]); )
.attr('cy', function(d) return y(d[1]); )
.style('cursor', 'pointer')
.style('fill', 'steelblue');
focus.selectAll('circle')
.call(drag);
focus.append('g')
.attr('class', 'axis axis--x')
.attr('transform', 'translate(0,' + height + ')')
.call(xAxis);
focus.append('g')
.attr('class', 'axis axis--y')
.call(yAxis);
function dragstarted(d)
d3.select(this).raise().classed('active', true);
function dragged(d)
d3.select(this)
.attr('cx', d[0] = d3.event.x)
.attr('cy', d[1] = d3.event.y)
focus.select('path').attr('d', line);
function dragended(d)
d3.select(this).classed('active', false);
</script>
【问题讨论】:
【参考方案1】:d3.event
保持像素位置,但您的绘图是由用户空间坐标驱动的。因此,您需要将这些像素位置转换为用户空间。您可以使用您的秤invert 方法来做到这一点。
function dragged(d)
d[0] = x.invert(d3.event.x); // convert to user-space
d[1] = y.invert(d3.event.y);
d3.select(this)
.attr('cx', x(d[0])) // back to pixels
.attr('cy', y(d[1]))
focus.select('path').attr('d', line); //line does pixel conversion too
运行代码:
<!DOCTYPE html>
<svg ></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var svg = d3.select("svg"),
margin = top: 20, right: 20, bottom: 30, left: 50,
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom;
let points = d3.range(1, 10).map(function(i)
return [i * width / 10, 50 + Math.random() * (height - 100)];
);
var x = d3.scaleLinear()
.rangeRound([0, width]);
var y = d3.scaleLinear()
.rangeRound([height, 0]);
var xAxis = d3.axisBottom(x),
yAxis = d3.axisLeft(y);
var line = d3.line()
.x(function(d) return x(d[0]); )
.y(function(d) return y(d[1]); );
let drag = d3.drag()
.on('start', dragstarted)
.on('drag', dragged)
.on('end', dragended);
svg.append('rect')
.attr('class', 'zoom')
.attr('cursor', 'move')
.attr('fill', 'none')
.attr('pointer-events', 'all')
.attr('width', width)
.attr('height', height)
.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')
var focus = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
x.domain(d3.extent(points, function(d) return d[0]; ));
y.domain(d3.extent(points, function(d) return d[1]; ));
focus.append("path")
.datum(points)
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.attr("stroke-width", 1.5)
.attr("d", line);
focus.selectAll('circle')
.data(points)
.enter()
.append('circle')
.attr('r', 5.0)
.attr('cx', function(d) return x(d[0]); )
.attr('cy', function(d) return y(d[1]); )
.style('cursor', 'pointer')
.style('fill', 'steelblue');
focus.selectAll('circle')
.call(drag);
focus.append('g')
.attr('class', 'axis axis--x')
.attr('transform', 'translate(0,' + height + ')')
.call(xAxis);
focus.append('g')
.attr('class', 'axis axis--y')
.call(yAxis);
function dragstarted(d)
d3.select(this).raise().classed('active', true);
function dragged(d)
d[0] = x.invert(d3.event.x);
d[1] = y.invert(d3.event.y);
d3.select(this)
.attr('cx', x(d[0]))
.attr('cy', y(d[1]))
focus.select('path').attr('d', line);
function dragended(d)
d3.select(this).classed('active', false);
</script>
【讨论】:
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