我解决了我的最初目标,让最后一个点由虚线连接,而曲线的其余部分用实线连接(见图)。
但是,通过这样做,我失去了曲线的平滑。 你会如何解决这个问题?
另外,如果有一个样式取代类似于HTML5中的类,该怎么做? (圆圈有一个红色笔触作为一个样式属性,但赢得了它有一个蓝色的类。)
// curve
self.svg.append("path")
.datum(function() {return data.slice(0,data.length-1);})
.attr("stroke", colors(i))
.attr("class", "line ")
.attr("d", d3.line()
.curve(d3.curveCatmullRom)
.x(function(d) { return self.xSales(d.period) + self.xSales.bandwidth()/2;})
.y(function(d) { return self.ySales(v(d)); })
);
self.svg.append("path")
.datum(function() {return data.slice(data.length-2, data.length);})
.attr("stroke", colors(i))
.attr("class", "line currentPeriod")
.attr("d", d3.line()
.curve(d3.curveCatmullRom)
.x(function(d) { return self.xSales(d.period) + self.xSales.bandwidth()/2;})
.y(function(d) { return self.ySales(v(d)); })
);
答案 0 :(得分:1)
关于我的评论:
对于第一个问题,您需要生成单个路径并使用破折号偏移和渐变着色。
我提供了一个非常好的答案here,关于如何划分单个路径的一部分,但它没有提供颜色。所以我在下面对此进行了更新:
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.x.axis path {
display: none;
}
.line {
fill: none;
stroke-width: 1.5px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var margin = {
top: 20,
right: 20,
bottom: 30,
left: 50
},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var data = d3.range(11).map(function(d, i) {
return {
x: i,
y: Math.random() * 100
};
});
var x = d3.scale.linear()
.range([0, width])
.domain([0, 10]);
var y = d3.scale.linear()
.range([height, 0])
.domain([0, 100]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left");
var line = d3.svg.line()
.x(function(d) {
return x(d.x);
})
.y(function(d) {
return y(d.y);
})
.interpolate("basis");
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 + ")");
var lG = svg.append("defs")
.append("linearGradient")
.attr("id", "lineColor")
.attr("x1", "0%")
.attr("x2", "100%")
.attr("y1", "0%")
.attr("y2", "0%");
lG.append("stop")
.attr("offset", "0")
.attr("stop-color", "steelblue");
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
var p = svg.append("path")
.datum(data)
.attr("class", "line")
.attr("stroke", "url(#lineColor)")
.attr("d", line);
// draw dashed from 2.7 to 7 in the X domain
var dashBetweenX = [2.5, 7]
path = p.node(),
totalLen = path.getTotalLength();
// find the corresponding line lengths
var dashBetweenL = dashBetweenX.map(function(d, i) {
var beginning = 0,
end = totalLen,
target = null,
d = x(d);
// find the line lengths the correspond to our X values
// stolen from @duopixel from http://bl.ocks.org/duopixel/3824661
while (true) {
target = Math.floor((beginning + end) / 2);
pos = path.getPointAtLength(target);
if ((target === end || target === beginning) && pos.x !== d) {
break;
}
if (pos.x > d) end = target;
else if (pos.x < d) beginning = target;
else break; //position found
}
return target;
})
var sd = dashBetweenL[0],
dp = dashBetweenL[0],
count = 0;
while (dp < dashBetweenL[1]) {
count++;
dp += 4;
sd += ", 4";
}
if (count % 2 == 0) {
sd += ", 4, " + (totalLen - dashBetweenL[1]);
} else {
sd += ", " + (totalLen - dashBetweenL[1]);
}
p.attr("stroke-dasharray", sd);
lG.append("stop")
.attr("offset", dashBetweenX[0] / x.domain()[1])
.attr("stop-color", "steelblue");
lG.append("stop")
.attr("offset", dashBetweenX[0] / x.domain()[1] + 0.001)
.attr("stop-color", "red");
lG.append("stop")
.attr("offset", dashBetweenX[1] / x.domain()[1])
.attr("stop-color", "red");
lG.append("stop")
.attr("offset", dashBetweenX[1] / x.domain()[1] + 0.001)
.attr("stop-color", "steelblue");
lG.append("stop")
.attr("offset", '1')
.attr("stop-color", "steelblue");
</script>
</body>
</html>
&#13;