所以我试图在我的图表中实现像这个例子中的刷子: http://bl.ocks.org/DStruths/9c042e3a6b66048b5bd4
但是设置contextArea会遇到一些麻烦 我认为在例子中版本是d3.v3而我在d3.v4 这方面可能存在问题。
你可以帮我这个吗?我在代码中定义了滑块部分。我想注意我的程序在没有滑块的情况下工作。
<svg width="960" height="500"></svg>
<script>
var svg = d3.select("svg"),
margin = {top: 20, right: 200, bottom: 100, left: 50},
margin2 = { top: 430, right: 10, bottom: 20, left: 40 },
width = svg.attr("width") - margin.left - margin.right,
height = svg.attr("height") - margin.top - margin.bottom,
height2 = svg.attr("height") - margin2.top - margin2.bottom,
g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var parseTime = d3.timeParse("%m/%d/%Y %H:%M:%S %p");
var x = d3.scaleTime().range([0, width]),
x2 = d3.scaleTime().range([0, width]), // Duplicate xScale for brushing ref later
y = d3.scaleLinear().range([height, 0]),
z = d3.scaleOrdinal(d3.schemeCategory10);
var maxY; // Defined later to update yAxis
var line = d3.line()
.curve(d3.curveBasis)
.x(function(d) { return x(parseTime(d.date)); })
.y(function(d) { return y(d.temperature); });
//for slider part-----------------------------------------------------------------------------------
var context = svg.append("g") // Brushing context box container
.attr("transform", "translate(" + 0 + "," + 410 + ")")
.attr("class", "context");
//append clip path for lines plotted, hiding those part out of bounds
g.append("defs")
.append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", width)
.attr("height", height);
//end slider part-----------------------------------------------------------------------------------
d3.json("testSerialisation_v5.ujson", function(error, data) {
if (error) throw error;
var data = data["Session_test"][0]["datas_lines"];
let responses = [];
data.forEach(obj => {
if (obj.log_time !== "No data") {
let iterator = 0;
let final = {};
obj.datas_line.forEach(d => {
final[iterator.toString()] = d;
iterator++;
});
final.log_time = obj.log_time;
responses.push(final);
}
});
var dateKey = d3.keys(responses[0]);
var i = dateKey.indexOf('log_time')
if(i != -1) {
dateKey.splice(i, 1);
}
var temp_list = dateKey.map(function(d) {
return {
id:d,
values: responses.map( function(e) {
return {
date: e.log_time,
temperature: e[d]
};
})
}
});
console.log(responses);
x.domain(d3.extent(responses, function(d) { return parseTime(d.log_time); }));
x2.domain(x.domain()); // Setting a duplicate xdomain for brushing reference later
y.domain([
d3.min(temp_list, function(c) { return d3.min(c.values, function(d) { return d.temperature; }); }),
d3.max(temp_list, function(c) { return d3.max(c.values, function(d) { return d.temperature; }); })
]);
z.domain(temp_list.map(function(c) { return c.id; }));
//for slider part-----------------------------------------------------------------------------------
var brush = d3.brushX() //for slider bar at the bottom
.extent(responses, function(d) { return parseTime(d.log_time); })
.on("brush", brushed);
context.append("g") // Create brushing xAxis
.attr("class", "x axis1")
.attr("transform", "translate(0," + height2 + ")")
.call(x2);
// HOW TO SET CONTEXTE AREA ???
var contextArea = d3.area() // Set attributes for area chart in brushing context graph
.interpolate("monotone")
.x(function(d) { return xScale2(d.log_time); }) // x is scaled to xScale2
.y0(height2) // Bottom line begins at height2 (area chart not inverted)
.y1(0); // Top line of area, 0 (area chart not inverted)
//plot the rect as the bar at the bottom
context.append("path") // Path is created using svg.area details
.attr("class", "area")
.attr("d", contextArea(responses[0].values)) // pass first categories data .values to area path generator
.attr("fill", "#F1F1F2");
//append the brush for the selection of subsection
context.append("g")
.attr("class", "x brush")
.call(brush)
.selectAll("rect")
.attr("height", height2) // Make brush rects same height
.attr("fill", "#E6E7E8");
//end slider part-------------------------------------------------------------------------------
g.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
g.append("g")
.attr("class", "axis axis--y")
.call(d3.axisLeft(y))
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", "0.71em")
.attr("fill", "#000")
.text("Temperature, ยบC");
var temp = g.selectAll(".temp")
.data(temp_list)
.enter().append("g")
.attr("class", "temp");
temp.append("path")
.attr("class", "line")
.attr("d", function(d) { return line(d.values); })
.style("stroke", function(d) { return z(d.id); });
temp.append("text")
.datum(function(d) { return {id: d.id, value: d.values[d.values.length - 1]}; })
.attr("transform", function(d) { return "translate(" + x(parseTime(d.value.date)) + "," + y(d.value.temperature) + ")"; })
.attr("x", 3)
.attr("dy", "0.35em")
.style("font", "10px sans-serif")
.text(function(d) { return d.id; });
//for brusher of the slider bar at the bottom
function brushed() {
x.domain(brush.empty() ? x2.domain() : brush.extent()); // If brush is empty then reset the Xscale domain to default, if not then make it the brush extent
svg.select(".x.axis") // replot xAxis with transition when brush used
.transition()
.call(xAxis);
maxY = findMaxY(responses); // Find max Y rating value categories data with "visible"; true
y.domain([0,maxY]); // Redefine yAxis domain based on highest y value of categories data with "visible"; true
svg.select(".y.axis") // Redraw yAxis
.transition()
.call(y);
issue.select("path") // Redraw lines based on brush xAxis scale and domain
.transition()
.attr("d", function(d){
return d.visible ? line(d.values) : null; // If d.visible is true then draw line for this d selection
});
};
});
</script>
数据用于测试:
{
"Session_test": [{
"datas_lines": [{
"datas_line": [],
"log_time": "No data"
},
{
"datas_line": [],
"log_time": "No data"
},
{
"datas_line": [],
"log_time": "No data"
},
{
"datas_line": [
"157",
"158",
"157",
"157",
"157",
"158",
"159",
"161",
"160",
"160",
"159",
"158",
"159",
"160",
"160",
"160",
"160",
"161",
"160",
"161",
"159",
"161",
"161",
"158",
"161",
"159",
"160",
"157"
],
"log_time": "5/18/2017 4:32:14 PM"
},
{
"datas_line": [
"154",
"156",
"155",
"155",
"155",
"156",
"158",
"159",
"158",
"157",
"157",
"156",
"157",
"158",
"159",
"158",
"158",
"159",
"159",
"159",
"158",
"159",
"159",
"156",
"159",
"157",
"158",
"156"
],
"log_time": "5/18/2017 4:34:14 PM"
},
{
"datas_line": [
"154",
"156",
"155",
"155",
"155",
"156",
"158",
"159",
"158",
"157",
"157",
"156",
"157",
"158",
"159",
"158",
"158",
"159",
"159",
"159",
"158",
"159",
"159",
"156",
"159",
"157",
"158",
"156"
],
"log_time": "5/18/2017 4:34:14 PM"
}
]
}]
}