[英]Changing size of ticks on y axis and adding legend in D3.js
我是D3新手,我想根據傳入的數據繪制多個圖。 在這里,我嘗試繪制其中之一,並將在同一頁面上再添加4個類似的內容。 以下是我到目前為止的代碼:
var data = [
{"mytime": "2015-12-01T11:10:00.000Z", "value": 64},
{"mytime": "2015-12-01T11:15:00.000Z", "value": 67},
{"mytime": "2015-12-01T11:20:00.000Z", "value": 70},
{"mytime": "2015-12-01T11:25:00.000Z", "value": 64},
{"mytime": "2015-12-01T11:30:00.000Z", "value": 72},
{"mytime": "2015-12-01T11:35:00.000Z", "value": 75},
{"mytime": "2015-12-01T11:40:00.000Z", "value": 71},
{"mytime": "2015-12-01T11:45:00.000Z", "value": 80}
];
var margin = { top: 30, right: 30, bottom: 40, left:50 };
var height = 200 - margin.top - margin.bottom,
width = 800 - margin.left - margin.right;
console.log("1")
var parseDate = d3.time.format("%Y-%m-%dT%H:%M:%S.%LZ").parse;
data.forEach(function(d) {
d.mytime = parseDate(d.mytime);
});
var x_extent = d3.extent(data, function(d){
return d.mytime});
console.log("2")
var y_extent = d3.extent(data, function(d){
return d.value});
var x_scale = d3.time.scale()
.domain(x_extent)
.range([0,width]);
console.log("3")
var y_scale = d3.scale.linear()
.domain([0,y_extent[1]])
.range([height,0]);
//Line
var lineGen = d3.svg.line()
.x(function (d) {
console.log(d.date)
return x_scale(d.mytime);
})
.y(function (d) {
return y_scale(d.value);
});
var myChart = d3.select('body').append('svg')
.style('background', '#E7E0CB')
.attr('width', width + margin.left + margin.right)
.attr('height', height + margin.top + margin.bottom)
.append('g')
.attr('transform', 'translate('+ margin.left +', '+ margin.top +')')
.append('svg:path')
.datum(data)
.attr('class', 'line')
.attr("d",lineGen)
.attr("data-legend","pulse")
.attr('stroke', 'green')
.attr('stroke-width', 0.5)
.attr('fill', 'none');
var vGuideScale = d3.scale.linear()
.domain([0,y_extent[1]])
.range([height, 0])
var vAxis = d3.svg.axis()
.scale(vGuideScale)
.orient('left')
// .tickFormat("") //For removing values
.ticks(5)
var vGuide = d3.select('svg').append('g')
vAxis(vGuide)
vGuide.attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')')
vGuide.selectAll('path')
.style({ fill: 'none', stroke: "#000"})
vGuide.selectAll('line')
.style({ stroke: "#000"})
console.log("4")
d3.select('svg').append('g')
.append("text")
.attr("transform", "rotate(-90)")
.attr("y",6)
.attr("x",-50)
.attr("dy", ".51em")
.attr("font-size", "10px")
.style("text-anchor", "end")
.attr("fill", "green")
.text("Value");
console.log("5")
var hAxis = d3.svg.axis()
.scale(x_scale)
.orient('bottom')
.ticks(d3.time.minute, 5);
var hGuide = d3.select('svg').append('g')
hAxis(hGuide)
hGuide.attr('transform', 'translate(' + margin.left + ', ' + (height + margin.top) + ')')
hGuide.selectAll('path')
.style({ fill: 'none', stroke: "#000"})
hGuide.selectAll('line')
.style({ stroke: "#000"})
我對代碼的格式幾乎沒有疑問:
謝謝
答案是使用css來控制組件的樣式(包括字體大小)。 例如,對於SVG標簽中的所有字體:
svg {
font: 10px sans-serif;
}
其次,建立圖例可能非常簡單:
var legend = myChart.append("g")
.attr("class", "legend")
.attr("transform", "translate(" + 5 + "," + (height - 25) + ")")
legend.append("rect")
.style("fill", "green")
.attr("width", 20)
.attr("height", 20);
legend.append("text")
.text("My Awesome Legend Item")
.attr("x", 25)
.attr("y", 12);
完整代碼示例:
<!DOCTYPE html> <html> <head> <script data-require="d3@3.5.3" data-semver="3.5.3" src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.3/d3.js"></script> <style> svg { font: 10px sans-serif; } .axis path, .axis line { fill: none; stroke: #000; shape-rendering: crispEdges; } </style> </head> <body> <script> var data = [{ "mytime": "2015-12-01T11:10:00.000Z", "value": 64 }, { "mytime": "2015-12-01T11:15:00.000Z", "value": 67 }, { "mytime": "2015-12-01T11:20:00.000Z", "value": 70 }, { "mytime": "2015-12-01T11:25:00.000Z", "value": 64 }, { "mytime": "2015-12-01T11:30:00.000Z", "value": 72 }, { "mytime": "2015-12-01T11:35:00.000Z", "value": 75 }, { "mytime": "2015-12-01T11:40:00.000Z", "value": 71 }, { "mytime": "2015-12-01T11:45:00.000Z", "value": 80 }]; var margin = { top: 30, right: 30, bottom: 40, left: 50 }; var height = 200 - margin.top - margin.bottom, width = 800 - margin.left - margin.right; console.log("1") var parseDate = d3.time.format("%Y-%m-%dT%H:%M:%S.%LZ").parse; data.forEach(function(d) { d.mytime = parseDate(d.mytime); }); var x_extent = d3.extent(data, function(d) { return d.mytime }); console.log("2") var y_extent = d3.extent(data, function(d) { return d.value }); var x_scale = d3.time.scale() .domain(x_extent) .range([0, width]); console.log("3") var y_scale = d3.scale.linear() .domain([0, y_extent[1]]) .range([height, 0]); //Line var lineGen = d3.svg.line() .x(function(d) { console.log(d.date) return x_scale(d.mytime); }) .y(function(d) { return y_scale(d.value); }); var myChart = d3.select('body').append('svg') .style('background', '#E7E0CB') .attr('width', width + margin.left + margin.right) .attr('height', height + margin.top + margin.bottom) .append('g') .attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')'); myChart .append('svg:path') .datum(data) .attr('class', 'line') .attr("d", lineGen) .attr("data-legend", "pulse") .attr('stroke', 'green') .attr('stroke-width', 0.5) .attr('fill', 'none'); var legend = myChart.append("g") .attr("class", "legend") .attr("transform", "translate(" + 5 + "," + (height - 25) + ")") legend.append("rect") .style("fill", "green") .attr("width", 20) .attr("height", 20); legend.append("text") .text("My Awesome Legend Item") .attr("x", 25) .attr("y", 12); var vGuideScale = d3.scale.linear() .domain([0, y_extent[1]]) .range([height, 0]) var vAxis = d3.svg.axis() .scale(vGuideScale) .orient('left') // .tickFormat("") //For removing values .ticks(5) var vGuide = d3.select('svg').append('g').attr("class", "y axis") vAxis(vGuide) vGuide.attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')') console.log("4") d3.select('svg').append('g') .append("text") .attr("transform", "rotate(-90)") .attr("y", 6) .attr("x", -50) .attr("dy", ".51em") .attr("font-size", "10px") .style("text-anchor", "end") .attr("fill", "green") .text("Value"); console.log("5") var hAxis = d3.svg.axis() .scale(x_scale) .orient('bottom') .ticks(d3.time.minute, 5); var hGuide = d3.select('svg').append('g').attr("class", "x axis") hAxis(hGuide) hGuide.attr('transform', 'translate(' + margin.left + ', ' + (height + margin.top) + ')') </script> </body> </html>
您可以通過tickSize設置器控制刻度線的長度,如下所示:
var axis = d3.svg.axis()
.scale(scale)
.orient("right")
.ticks(2)
.tickSize(10)
.tickFormat(formatPercent);
接着:
svg.append("g")
.attr("class", "y axis")
.call(axis);
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