Question

我正在努力在Power BI自定义视觉中绘制一条sigle线。 Power BI中的报告使用TypeScript和d3.js v.3.0编写。我能够用轴绘制图表，但不显示该行。在HTML文件中使用纯d3.js非常简单，但由于字母保存，很难将它与TypeScript集成。

在开发此代码时，我遇到了几个问题。以下代码几乎可行。看一下这个片段。出现问题，在底部我删除'any'。

Here is link to sandbox at CodePen: https://codepen.io/SuszonyDzik/pen/aBaJJQ

module powerbi.extensibility.visual {
    export class Visual implements IVisual {
        private target: HTMLElement;
        private updateCount: number;

        private svg: d3.Selection<SVGAElement>;
        private host: IVisualHost;
        private selectionManager: ISelectionManager;

        //private xAxis: d3.Selection<SVGAElement>;
        //private yAxis: d3.Selection<SVGAElement>;


        private data = [
            {date: "2011-10-01",    close: 582.13},
            {date: "2011-10-10",    close: 303.00},
            {date: "2011-10-20",    close: 103.00},
            {date: "2011-10-25",    close: 143.00},
        ]

        static Config = {
            xScalePadding: 0.1,
            solidOpacity: 1,
            transparentOpacity: 0.5,
            xAxisFontMultiplier: 0.04,
        };

        private margin = {top: 20, right: 30, bottom: 30, left: 80};



        constructor(options: VisualConstructorOptions) {
            this.host = options.host;

            let svg = this.svg = d3.select(options.element)
                .append('svg')
                .classed('worksheet', true);
        }

        public update(options: VisualUpdateOptions) {
            let width = options.viewport.width - this.margin.left - this.margin.right;
            let height = options.viewport.height - this.margin.top - this.margin.bottom;

            this.svg.attr({
                width: width + this.margin.left + this.margin.right,
                height: height + this.margin.top + this.margin.bottom
            });



            let parseDate = d3.time.format("%Y-%m-%d").parse;                       

            let xScale = d3.time.scale()
                .domain(this.data.map(function(d) { return parseDate(d.date); }))
                .range([0, width])

            let yScale = d3.scale.linear()
                .domain([0, d3.max(this.data, function(d) { return d.close; })])
                .range([height, 0]);        

            let xAxis = d3.svg.axis()
                .scale(xScale)
                .orient("bottom")
                .ticks(10)

            let yAxis = d3.svg.axis()
                .scale(yScale)
                .orient("left")
                .ticks(10)
                .innerTickSize(-width)
                .outerTickSize(10)
                .tickPadding(10)



            let worksheet = d3.select(".worksheet")
                .attr("width", width + this.margin.left + this.margin.right)
                .attr("height", height + this.margin.top + this.margin.bottom);


            // remove exsisting axis and bar
            this.svg.selectAll('.axis').remove();
            this.svg.selectAll('.bar').remove();
            this.svg.selectAll('.chart').remove();


            let chart  = d3.select(".worksheet")
              .append("g")
                .attr("transform", "translate(" + this.margin.left + "," + this.margin.top + ")")
                .attr("class", "chart")

            chart.append("g")
                .attr("class", "x axis")
                .attr("transform", "translate(0," + height + ")")
                .call(xAxis);


            chart.append("g")
                .attr("class", "y axis")
                .call(yAxis)


            let line = d3.svg.line()
            .x(function(d) { console.log(parseDate(this.data.date)); return xScale(parseDate(this.data.date)); })
            .y(function(d) { return yScale(this.data.close); })
            .interpolate("linear")

            chart.append("path")
                .datum(this.data)
                .attr("class", "line")          
                .attr("d", <any> line)

        }

        public destroy(): void {
            //TODO: Perform any cleanup tasks here
        }
    }
}

Power BI chart with axes but without line

Answer 1

请更改

中的代码

chart.append("path")
.datum(this.data)
.attr("class", "line")          
.attr("d", <any> line)

要

chart.append("path")
.datum(this.data)
.attr("class", "line") 
.attr("d", "M" + this.data.map((d)=> {
return xScale( parseDate(d.date)) + ',' + yScale(d.close);
}).join('L'))

还来自下面的

let xScale = d3.time.scale()
.domain(this.data.map(function(d) { return parseDate(d.date); }))
.range([0, width])

到

let xScale = d3.time.scale() 
.domain(d3.extent(this.data,function(d) { return parseDate(d.date); }))
.range([0, width])

我修改了代码并且工作了。请找到输出。 Output

使用Power BI自定义可视化中的d3.js库绘制一条线

1 个答案: