[英]Plotting trend line with actual values in d3 line chart with angular
我正在嘗試使用angular和D3繪制實際值以及趨勢線。 我讀了許多教程,但不明白如何在d3中訪問控制器的多個變量。
我在控制器中有以下數據:
$scope.salesData=[
{hour: 1997,sales: 205000},
{hour: 1998,sales: 305000},
{hour: 1999,sales: 405000},
];
$scope.lrResults = {slope: -16958.279411764706, intercept: 34325954.51470588, r2: 0.8292316961223657}
HTML:
<div linear-chart chart-data="salesData" line-data="lrResults"></div>
然后我有以下指令:
app.directive('linearChart', function($parse, $window){
return{
restrict:'EA',
template:"<svg width='850' height='250'></svg>",
link: function(scope, elem, attrs){
var exp = $parse(attrs.chartData);
var salesDataToPlot=exp(scope);
var padding = 20;
var pathClass="path";
var xScale, yScale, xAxisGen, yAxisGen, lineFun, trendline;
var d3 = $window.d3;
var rawSvg=elem.find('svg');
var svg = d3.select(rawSvg[0]);
scope.$watchCollection(exp, function(newVal, oldVal){
salesDataToPlot=newVal;
redrawLineChart();
});
使用上面的代碼,我能夠解析包含在salesData
數據並使用以下d3代碼繪制折線圖:
svg.append("svg:path")
.attr("transform", "translate(70,0)")
.attr({
d: lineFun(salesDataToPlot),
"stroke": "red",
"stroke-width": 2,
"fill": "none",
"class": pathClass
});
但是我無法理解如何檢索lrResults
包含的數據,然后在法線圖的頂部添加趨勢線。
這是我用來繪制線條的代碼片段:
svg.append("svg:line")
.attr("x1", xScale(0))
.attr("y1", yScale(lrData.intercept))
.attr("x2", xScale(max))
.attr("y2", yScale((max*lrData.slope)+ lrData.intercept))
.style("stroke", "black");
您需要根據這些參數生成數據。
這是控制器內部的一個工作示例:
angular.module('d3-angular.controllers', [], function() {})
.controller('myCtrl', function($scope) {
// svg parameters
var width = 500, height = 500, margin = 50;
// line parameters (y = mx + b)
$scope.b = 0.3;
$scope.m = 2;
$scope.numPts = 20;
// generate data
var data = new Array($scope.numPts);
for (var idx = 0; idx < $scope.numPts; idx++) {
data[idx] = {
x: idx/$scope.numPts,
y: $scope.m*idx/$scope.numPts + $scope.b + (Math.random()-0.5)
}
}
// build the scales
var xScale = d3.scale.linear().domain([0,1]).range([margin,width-margin]);
var yScale = d3.scale.linear().domain([0,2.5]).range([height-margin,margin]);
// select our svg element, set up some properties
var svg = d3.select("svg");
svg.attr("width",width).attr("height",height);
// add the trendline
var line = svg.selectAll("line").data([{'p1': [0, $scope.b], 'p2': [1, $scope.m+$scope.b]}]);
line.enter().append("line").attr("stroke","red").attr("stroke-width",2)
.attr("x1", function(d) { return xScale(d.p1[0]) })
.attr("y1", function(d) { return yScale(d.p1[1]) })
.attr("x2", function(d) { return xScale(d.p2[0]) })
.attr("y2", function(d) { return yScale(d.p2[1]) })
// join with our data
var points = svg.selectAll("circle").data(data);
// enter (add circles)
points.enter().append("circle")
.attr("cx", function(d) {
return xScale(d.x);
})
.attr("cy", function(d) {
return yScale(d.y);
})
.attr("r", 5);
// add Axes
var xAxis = d3.svg.axis().scale(xScale).orient("bottom").tickValues([0,1]);
svg.append("g").attr("class","axis")
.attr("transform", "translate(0," + (height-margin) + ")")
.call(xAxis);
var yAxis = d3.svg.axis().scale(yScale).orient("left").ticks(5);
svg.append("g").attr("class","axis")
.attr("transform", "translate(" + margin + ",0)")
.call(yAxis);
})
用m和b替換示波器參數“ slope”和“ intercept”。 嘗試...可能會有幫助!
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