如何在路径中颜色描边？

Question

window.onload = function(){ 
    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.timeFormat("%c").parse; 

var x = d3.scaleLinear().range([0, width]); 
var y = d3.scaleLinear().range([height, 0]); 

var xAxis = d3.axisBottom() 
    .scale(x).ticks(5); 

var yAxis = d3.axisLeft() 
    .scale(y).ticks(5); 

var valueline = d3.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) 
    .append("g") 
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); 

// Get the data 
var data = [{ 
    date: "1 ", 
    close: "58.13" 
}, { 
    date: "2 ", 
    close: "53.98" 
}, { 
    date: "3 ", 
    close: "67.00" 
}, { 
    date: "4 ", 
    close: "89.70" 
}, { 
    date: "5 ", 
    close: "99.00" 
}, { 
    date: "6 ", 
    close: "20.00" 
}]; 

var data2 = [{ 
    date: "1 ", 
    close: "52.13" 
}, { 
    date: "2 ", 
    close: "30.98" 
}, { 
    date: "3 ", 
    close: "36.00" 
}, { 
    date: "4 ", 
    close: "40.70" 
}, { 
    date: "5 ", 
    close: "20.00" 
}, { 
    date: "6 ", 
    close: "96.00" 
}]; 

data.forEach(function (d) { 
    d.date = d.date; 
    d.close = +d.close; 
}); 

// scaleLinear 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; 
    })]); 

svg.append("path") // Add the valueline path. 
.attr("d", valueline(data)).attr("stroke","red"); 

svg.append("path") // Add the valueline path. 
.attr("d", valueline(data2)).attr("stroke","blue"); 

svg.append("g") // Add the X Axis 
.attr("class", "x axis") 
    .attr("transform", "translate(0," + height + ")") 
    .call(xAxis); 

svg.append("g") // Add the Y Axis 
.attr("class", "y axis") 
    .call(yAxis); 
} 

我对此很陌生。我想为我正在使用的笔画添加颜色，但我无法做到这一点。我已经添加了在代码中应用描边颜色的属性，但它不起作用。我希望每一行都是不同的颜色。请帮助我解决问题。

Answer 1

你的代码似乎工作正常。这是d3的实现方式。

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.timeFormat("%c").parse; 
 

 
var x = d3.scaleLinear().range([0, width]); 
 
var y = d3.scaleLinear().range([height, 0]); 
 

 
var xAxis = d3.axisBottom() 
 
    .scale(x).ticks(5); 
 

 
var yAxis = d3.axisLeft() 
 
    .scale(y).ticks(5); 
 

 
var valueline = d3.line() 
 
    .x(function(d) { 
 
    return x(d.date); 
 
    }) 
 
    .y(function(d) { 
 
    return y(d.close); 
 
    }); 
 

 
var colors = d3.scaleOrdinal(d3.schemeCategory10); 
 

 
var 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 + ")"); 
 

 
// Get the data 
 
var data = [{ 
 
    date: "1 ", 
 
    close: "58.13" 
 
}, { 
 
    date: "2 ", 
 
    close: "53.98" 
 
}, { 
 
    date: "3 ", 
 
    close: "67.00" 
 
}, { 
 
    date: "4 ", 
 
    close: "89.70" 
 
}, { 
 
    date: "5 ", 
 
    close: "99.00" 
 
}, { 
 
    date: "6 ", 
 
    close: "20.00" 
 
}]; 
 

 
var data2 = [{ 
 
    date: "1 ", 
 
    close: "52.13" 
 
}, { 
 
    date: "2 ", 
 
    close: "30.98" 
 
}, { 
 
    date: "3 ", 
 
    close: "36.00" 
 
}, { 
 
    date: "4 ", 
 
    close: "40.70" 
 
}, { 
 
    date: "5 ", 
 
    close: "20.00" 
 
}, { 
 
    date: "6 ", 
 
    close: "96.00" 
 
}]; 
 

 
data.forEach(function(d) { 
 
    d.date = d.date; 
 
    d.close = +d.close; 
 
}); 
 

 
// scaleLinear 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; 
 
})]); 
 

 
svg.selectAll("path.line").data([data, data2]) 
 
    .enter(). 
 
append("path") // Add the valueline path. 
 
    .attr("class", "line") 
 
    .attr("d", valueline) 
 
    .attr("stroke", function(d, i) { 
 
    return colors(i); 
 
    }); 
 

 

 
svg.append("g") // Add the X Axis 
 
    .attr("class", "x axis") 
 
    .attr("transform", "translate(0," + height + ")") 
 
    .call(xAxis); 
 

 
svg.append("g") // Add the Y Axis 
 
    .attr("class", "y axis") 
 
    .call(yAxis);

path { 
 
    fill: none; 
 
}

<script src="https://d3js.org/d3.v4.min.js"></script>d