我目前正在研究基于画笔时间窗口选择更新的 d3js 图表。我遇到的问题是主情节上的线条看起来断断续续。我已经更改了插值以使用不同的类型，并使用了张力属性，但我似乎无法获得平滑的线条。有没有人有任何想法？
var data = new TLSampleDataContainer()
, keyToEntries = data.keyToEntries
, keys = data.keyset
, pageSize = data.pageSize;
// Visual attributes
var tl = {
times : data.timeEntries,
xTicks : function(start, end){
var min = start.getTime()
, max = end.getTime()
, range;
if(max-min <= CONSTANTS.TIME.HOURS.SCALE_FACTOR){
var totalHours = d3.round((max-min)/3600000);
var scale = Math.ceil(totalHours/12);
return d3.time.hours(start, end, scale);
}
if(max-min <= CONSTANTS.TIME.DAYS.SCALE_FACTOR){
var totalDays = d3.round((max-min)/86400000);
var scale = Math.ceil(totalDays/7);
range = d3.time.days(start, end, scale);
return range;
}
if(max-min <= CONSTANTS.TIME.WEEKS.SCALE_FACTOR){
var totalWeeks = d3.round((max-min)/(86400000 * 7));
var scale = Math.ceil(totalWeeks/4);
range = d3.time.weeks(start, end, scale);
return range;
}
if(max-min <= CONSTANTS.TIME.MONTHS.SCALE_FACTOR){
range = d3.time.months(start, end);
return range;
}
return d3.time.years(start,end);
},
xTicksFormat : function(d) {
var start = tl.xScale.domain()[0]
, end = tl.xScale.domain()[1]
, max = end.getTime()
, min = start.getTime();
if(max-min <= CONSTANTS.TIME.HOURS.SCALE_FACTOR) {
return d3.time.format('%I %p')(d);
}
if(max-min <= CONSTANTS.TIME.DAYS.SCALE_FACTOR) {
return d3.time.format('%d')(d);
}
if(max-min <= CONSTANTS.TIME.WEEKS.SCALE_FACTOR){
return d3.time.format('%a -week %U')(d)
}
if(max - min <= CONSTANTS.TIME.MONTHS.SCALE_FACTOR){
return d3.time.format('%b')(d)
}
return d3.time.format('%Y')(d)
},
x1Ticks: function(start, end){
var min = start.getTime()
, max = end.getTime();
if(max-min <= CONSTANTS.TIME.HOURS.SCALE_FACTOR){
return d3.time.days( d3.time.day.floor(start), end);
}
if(max-min <= CONSTANTS.TIME.DAYS.SCALE_FACTOR){
return d3.time.weeks(d3.time.day.floor(start), end);
}
if(max-min <= CONSTANTS.TIME.WEEKS.SCALE_FACTOR){
return d3.time.months(d3.time.week.floor(start), end);
}
if(max-min <= CONSTANTS.TIME.MONTHS.SCALE_FACTOR){
return d3.time.years(d3.time.month.floor(start), end);
}
return [];
},
x1TicksFormat: function(d){
var start = tl.xScale.domain()[0]
, end = tl.xScale.domain()[1]
, max = end.getTime()
, min = start.getTime();
if(max-min <= CONSTANTS.TIME.HOURS.SCALE_FACTOR){
return d3.time.format('%a, %b %d %Y - week %U')(d);
}
if(max-min <= CONSTANTS.TIME.DAYS.SCALE_FACTOR){
return d3.time.format('%a, %b %Y - week %U')(d);
}
if(max-min <= CONSTANTS.TIME.WEEKS.SCALE_FACTOR){
return d3.time.format('%b %Y')(d)
}
return d3.time.format('%Y')(d);
},
drawLines: function(){
keyToEntries.forEach(function(key, values){
var line = d3.svg.line()
.x(function(d){
return tl.xScale(d.time);
})
.y(function(d){
return tl.yScale(d.value);
})
.interpolate("basis");
tl.chart.append('g').attr('class', 'data ' + key)
.append("path")
.attr("d", line(values));
});
},
//Handle Brush Event
onBrush: function(){
var bext = brush.empty() ? ext2 : brush.extent();
lc.xScale.domain(bext);
lc.initKeys(bext);
// lc.yScale = d3.scale.linear().domain([0, d3.max(lc.y)]);
// lc.xAxis.ticks(lc.xTicks(bext[0], bext[1])).tickFormat(lc.xTicksFormat(bext[0], bext[1]));
// lc.chart.select('.y.axis.linechart').call(lc.yAxis)
lc.chart.select('.axis.timescale').call(lc.xAxis);
lc.drawLines();
}
};
var lc = {
timeScale : function(extent){
var start = d3.min(extent)
, end = d3.max(extent)
, min = start.getTime()
, max = end.getTime();
if(max-min <= CONSTANTS.TIME.HOURS.SCALE_FACTOR){
return [d3.time.hour.floor(start), d3.time.hour.ceil(end)];
}
if(max-min <= CONSTANTS.TIME.DAYS.SCALE_FACTOR){
return [d3.time.day.floor(start), d3.time.day.ceil(end)];
}
if(max-min <= CONSTANTS.TIME.WEEKS.SCALE_FACTOR){
return [d3.time.week.floor(start), d3.time.week.ceil(end)];
}
return [d3.time.month.floor(start), d3.time.month.ceil(end)];
},
initKeys: function(domain){
var start = d3.min(domain)
, end = d3.max(domain)
, min = start.getTime()
, max = end.getTime();
lc.idsToSelectedIntervals = d3.map();
lc.y = [];
keyToEntries.forEach(function(key, values){
var selectedIntervals = []
for(var i=0; i < values.length; i++){
var entry = values[i];
if(entry.time.getTime() >= min && entry.time.getTime() <= max){
lc.y.push(entry.value);
selectedIntervals.push(entry);
lc.idsToSelectedIntervals.set(entry.id, selectedIntervals);
}
}
});
},
xTicks: function(start, end){
var min = start.getTime()
, max = end.getTime();
if(max-min <= CONSTANTS.TIME.MINUTES.SCALE_FACTOR){
totalSeconds = d3.round((max-min)/1000);
var scale = Math.ceil(totalSeconds/10);
return [start, end]/d3.time.seconds(start, end, totalSeconds);
}
if(max-min <= CONSTANTS.TIME.HOURS.SCALE_FACTOR){
totalMinutes = d3.round((max-min)/60000);
var scale = Math.ceil(totalMinutes/10);
return [start, end] //d3.time.minutes(start, end, totalMinutes);
}
if(max-min <= CONSTANTS.TIME.DAYS.SCALE_FACTOR){
var totalHours = d3.round((max-min)/(3600000));
var scale = Math.ceil(totalHours/8);
return d3.time.hours(start, end, scale);
}
if(max-min <= CONSTANTS.TIME.WEEKS.SCALE_FACTOR){
var totalDays = d3.round((max - min)/86400000);
var scale = Math.ceil(totalDays/12);
return d3.time.days(start, end, scale);
}
if(max-min <= CONSTANTS.TIME.MONTHS.SCALE_FACTOR){
var totalWeeks = d3.round((max-min)/86400000 *7);
var scale = Math.ceil(totalWeeks/8);
return d3.time.weeks(start, end);
}
return d3.time.months(start,end, 12);
},
xTicksFormat: function(d){
var min = d3.min(lc.xScale.domain())
, max = d3.max(lc.xScale.domain());
if(max-min <= CONSTANTS.TIME.HOURS.SCALE_FACTOR){
return d3.time.format('%d %X %p')(d);
}
if(max-min <= CONSTANTS.TIME.DAYS.SCALE_FACTOR){
return d3.time.format('%I %p')(d);
}
if(max-min <= CONSTANTS.TIME.WEEKS.SCALE_FACTOR){
return d3.time.format('%d')(d);
}
if(max-min <= CONSTANTS.TIME.MONTHS.SCALE_FACTOR){
return d3.time.format('week-%U')(d);
}
return d3.time.format('%b %y')(d)
},
drawLines: function(){
var entryset = lc.idsToSelectedIntervals.entries();
var g = lc.chart.selectAll('g.data')
.data(entryset, function(d){return d.key;})
.each(function(d, i){
d3.select(this)
.select('path')
.datum(d.value)
.attr('d', lc.line);
});
g.enter().append('g')
.attr('class', function(d){return "data linechart " + d.key;})
.append('path')
.each(function(d, i){
d3.select(this)
.datum(d.value)
.attr('d', lc.line);
});
g.exit().remove();
},
drawGrid: function(){
//draw the Gridlines for line chart
lc.chart.append('g').selectAll('.gridline')
.remove()
.data(lc.chart.selectAll('.axis.timescale line.tick')[0])
.enter().append('line')
.attr('x1', function(d,i){return d.parentNode.transform.baseVal.getItem(0).matrix.e;})
.attr('x2', function(d,i){return d.parentNode.transform.baseVal.getItem(0).matrix.e;})
.attr('y1', 0)
.attr('y2', lc.height)
.attr('class', 'gridline');
lc.chart.append('g').selectAll('.gridline')
.remove()
.data(lc.chart.selectAll('.y.axis.linechart g > line.tick')[0])
.enter().append('line')
.attr('y1', function(d,i){return d.parentNode.transform.baseVal.getItem(0).matrix.f;})
.attr('y2', function(d,i){return d.parentNode.transform.baseVal.getItem(0).matrix.f;})
.attr('x1', 0)
.attr('x2', width)
.attr('class', 'gridline');
},
line: d3.svg.line()
.x(function(d){
return lc.xScale(d.time);
})
.y(function(d){
return lc.yScale(d.value);
})
.interpolate("basis")
};
var drawIntervals = function(mmap, x, y){
var i = 0;
var offset = .5 * y(1) + 0.5;
mmap.forEach(function(key, values){
var line = d3.svg.line()
.x(function(d){
return x(d.time);
})
.y(function(d){
return y(i) + offset;
});
tl.chart.append('g').attr('class', "interval data " + key)
.append("path")
.attr("d", line(values));
i++;
});
}
var CONSTANTS = {
TIME: {
MINUTES: {NAME:"minutes", FORMAT:'%x', SCALE_FACTOR: 3600000 * 1},
HOURS: {NAME:"hours", FORMAT:'%x', SCALE_FACTOR: 86400000 * 1},
DAYS : {NAME:"days", FORMAT:'%d', SCALE_FACTOR: 86400000 * 5},
WEEKS : {NAME:"weeks", format:'%b - Week %U of %y', SCALE_FACTOR: 86400000 * 28},
MONTHS : {NAME:"months", FORMAT:'%b %Y', SCALE_FACTOR: 86400000 * 365},
YEARS: {NAME: "years", FORMAT:'%y', SCALE_FACTOR: 86400000 * 365* 10}
}
}
var margin = {top:20, right:15, bottom:15, left:60}
, width = 500 - margin.left - margin.right
, height = 325 - margin.top - margin.bottom;
tl.height = 30;
lc.height = height - tl.height - 50;
var ext = d3.extent(tl.times);
tl.xScale = d3.time.scale().domain(ext).range([0, width]);
var ext2 = tl.xScale.domain();
lc.xScale = d3.time.scale().domain(ext2).range([0, width]);
lc.initKeys(ext2);
lc.yScale = d3.scale.linear().domain([0, d3.max(lc.y)]).range([lc.height, 0]);
tl.yScale = d3.scale.linear().domain([0, d3.max(lc.y)]).range([tl.height, 0]);
var main = d3.select('#mainWrapper')
.append('svg:svg')
.attr('width', width + margin.right + margin.left + 35)
.attr('height', height + margin.top + margin.bottom)
.attr('class', 'chart');
main.append('defs').append('clipPath')
.attr('id','clip')
.append('rect')
.attr('width', width + 100)
.attr('height', lc.height);
lc.chart = main.append('g')
.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')
.attr('width', width)
.attr('height', lc.height)
.attr('class', 'linechart');
tl.chart = main.append('g')
.attr('transform', 'translate('+ margin.left + ',' + (lc.height + 60) + ')')
.attr('width', width)
.attr('height', tl.height)
.attr('class', 'mini');
//var draw Timeline xaxis
tl.xAxis = d3.svg.axis()
.scale(tl.xScale)
.orient('bottom')
.ticks(tl.xTicks)
.tickFormat(tl.xTicksFormat)
.tickSize(6, 0, 0);
tl.x1Axis = d3.svg.axis()
.scale(tl.xScale)
.orient('top')
.ticks(tl.x1Ticks)
.tickFormat(tl.x1TicksFormat)
.tickSize(15, 0, 0);
lc.xAxis = d3.svg.axis()
.scale(lc.xScale)
.orient('bottom')
.ticks(lc.xTicks)
.tickFormat(lc.xTicksFormat)
.tickSize(6,0,0);
lc.yAxis = d3.svg.axis()
.scale(lc.yScale)
.orient('left')
.tickSubdivide(true)
.tickSize(6,0,0);
tl.yAxis = d3.svg.axis()
.scale(tl.yScale)
.orient('left')
.tickValues([tl.yScale.domain()[0], tl.yScale.domain()[1]])
.tickSize(6,0,6);
lc.chart.append('g')
.attr('transform', 'translate(-15, 0)')
.attr('class', 'y axis linechart')
.call(lc.yAxis);
lc.chart.append('g')
.attr('transform', 'translate(0,' + lc.height + ')')
.attr('class', 'axis timescale')
.call(lc.xAxis);
tl.chart.append('g')
.attr('transform', 'translate(0,' + tl.height + ')')
.attr('class', 'axis date')
.call(tl.xAxis);
tl.chart.append('g')
.attr('transform', 'translate(0,0.5)')
.attr('class', 'axis month')
.call(tl.x1Axis)
.selectAll('text')
.attr('dx', 5)
.attr('dy', 12);
tl.chart.append('g')
.attr('transform', 'translate(-15, 0)')
.attr('class', 'y axis timeline')
.call(tl.yAxis);
//Draw Grids
lc.drawGrid();
//Initialize brush to handle events
var brush = d3.svg.brush()
.x(tl.xScale)
.extent(tl.xScale.domain())
.on("brush", tl.onBrush);
tl.chart.append('g')
.attr('class', 'x brush')
.call(brush)
.selectAll('rect')
.attr('y', 1)
.attr('height', tl.height - 1);
// draw the path for each key on the line chart.
lc.drawLines();
tl.drawLines();
fiddle 链接:http://jsfiddle.net/rbrooks/NFKkV/1/
最佳答案
在 CSS 中，您将 shape-rendering: crispEdges 应用于整个图表，这将禁用其中所有内容的抗锯齿，包括路径。很可能您只想禁用图表轴的抗锯齿，因此您应该使规则更具选择性。 IE:
.chart .axis {
shape-rendering: crispEdges
}
关于d3.js - d3js 用于折线图的平滑线条，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/15911554/