TypeScript d3.scaleLog函數代碼示例

  function addLogYAxis() {
    let log_base = panel.yAxis.logBase;
    let {y_min, y_max} = adjustLogRange(data.heatmapStats.minLog, data.heatmapStats.max, log_base);

    y_min = panel.yAxis.min && panel.yAxis.min !== '0' ? adjustLogMin(panel.yAxis.min, log_base) : y_min;
    y_max = panel.yAxis.max !== null ? adjustLogMax(panel.yAxis.max, log_base) : y_max;

    // Set default Y min and max if no data
    if (_.isEmpty(data.buckets)) {
      y_max = Math.pow(log_base, 2);
      y_min = 1;
    }

    scope.yScale = yScale = d3.scaleLog()
      .base(panel.yAxis.logBase)
      .domain([y_min, y_max])
      .range([chartHeight, 0]);

    let domain = yScale.domain();
    let tick_values = logScaleTickValues(domain, log_base);

    let decimalsAuto = getPrecision(y_min);
    let decimals = panel.yAxis.decimals || decimalsAuto;

    // Calculate scaledDecimals for log scales using tick size (as in jquery.flot.js)
    let flot_tick_size = getFlotTickSize(y_min, y_max, tick_values.length, decimalsAuto);
    let scaledDecimals = getScaledDecimals(decimals, flot_tick_size);
    ctrl.decimals = decimals;
    ctrl.scaledDecimals = scaledDecimals;

    data.yAxis = {
      min: y_min,
      max: y_max,
      ticks: tick_values.length
    };

    let yAxis = d3.axisLeft(yScale)
      .tickValues(tick_values)
      .tickFormat(tickValueFormatter(decimals, scaledDecimals))
      .tickSizeInner(0 - width)
      .tickSizeOuter(0)
      .tickPadding(Y_AXIS_TICK_PADDING);

    heatmap.append("g")
      .attr("class", "axis axis-y")
      .call(yAxis);

    // Calculate Y axis width first, then move axis into visible area
    let posY = margin.top;
    let posX = getYAxisWidth(heatmap) + Y_AXIS_TICK_PADDING;
    heatmap.select(".axis-y").attr("transform", "translate(" + posX + "," + posY + ")");

    // Set first tick as pseudo 0
    if (y_min < 1) {
      heatmap.select(".axis-y").select(".tick text").text("0");
    }

    // Remove vertical line in the right of axis labels (called domain in d3)
    heatmap.select(".axis-y").select(".domain").remove();
  }

export function scaleFor(column: ChartColumn<any>, values: number[], minRange: number, maxRange: number, scaleName: string | null | undefined): d3.ScaleContinuousNumeric<number, number> {

  if (scaleName == "ZeroMax")
    return d3.scaleLinear()
      .domain([0, d3.max(values)!])
      .range([minRange, maxRange])
      .nice();

  if (scaleName == "MinMax") {
    if (column.type == "Date" || column.type == "DateTime") {
      const scale = d3.scaleTime()
        .domain(values)
        .range([minRange, maxRange]);

      const f = function (d: string) { return scale(new Date(d)); } as any as d3.ScaleContinuousNumeric<number, number>;
      f.ticks = scale.ticks as any;
      f.tickFormat = scale.tickFormat as any;
      return f;
    }
    else {
      return d3.scaleLinear()
        .domain([d3.min(values)!, d3.max(values)!])
        .range([minRange, maxRange])
        .nice();
    }
  }

  if (scaleName == "Log")
    return d3.scaleLog()
      .domain([d3.min(values)!, d3.max(values)!])
      .range([minRange, maxRange])
      .nice();

  if (scaleName == "Sqrt")
    return d3.scalePow().exponent(.5)
      .domain([d3.min(values)!, d3.max(values)!])
      .range([minRange, maxRange]);

  throw Error("Unexpected scale: " + scaleName);
}

  addLogYAxis() {
    const log_base = this.panel.yAxis.logBase;
    let { y_min, y_max } = this.adjustLogRange(this.data.heatmapStats.minLog, this.data.heatmapStats.max, log_base);

    y_min =
      this.panel.yAxis.min && this.panel.yAxis.min !== '0' ? this.adjustLogMin(this.panel.yAxis.min, log_base) : y_min;
    y_max = this.panel.yAxis.max !== null ? this.adjustLogMax(this.panel.yAxis.max, log_base) : y_max;

    // Set default Y min and max if no data
    if (_.isEmpty(this.data.buckets)) {
      y_max = Math.pow(log_base, 2);
      y_min = 1;
    }

    this.scope.yScale = this.yScale = d3
      .scaleLog()
      .base(this.panel.yAxis.logBase)
      .domain([y_min, y_max])
      .range([this.chartHeight, 0]);

    const domain = this.yScale.domain();
    const tick_values = this.logScaleTickValues(domain, log_base);

    const decimalsAuto = ticksUtils.getPrecision(y_min);
    const decimals = this.panel.yAxis.decimals || decimalsAuto;

    // Calculate scaledDecimals for log scales using tick size (as in jquery.flot.js)
    const flot_tick_size = ticksUtils.getFlotTickSize(y_min, y_max, tick_values.length, decimalsAuto);
    const scaledDecimals = ticksUtils.getScaledDecimals(decimals, flot_tick_size);
    this.ctrl.decimals = decimals;
    this.ctrl.scaledDecimals = scaledDecimals;

    this.data.yAxis = {
      min: y_min,
      max: y_max,
      ticks: tick_values.length,
    };

    const yAxis = d3
      .axisLeft(this.yScale)
      .tickValues(tick_values)
      .tickFormat(this.tickValueFormatter(decimals, scaledDecimals))
      .tickSizeInner(0 - this.width)
      .tickSizeOuter(0)
      .tickPadding(Y_AXIS_TICK_PADDING);

    this.heatmap
      .append('g')
      .attr('class', 'axis axis-y')
      .call(yAxis);

    // Calculate Y axis width first, then move axis into visible area
    const posY = this.margin.top;
    const posX = this.getYAxisWidth(this.heatmap) + Y_AXIS_TICK_PADDING;
    this.heatmap.select('.axis-y').attr('transform', 'translate(' + posX + ',' + posY + ')');

    // Set first tick as pseudo 0
    if (y_min < 1) {
      this.heatmap
        .select('.axis-y')
        .select('.tick text')
        .text('0');
    }

    // Remove vertical line in the right of axis labels (called domain in d3)
    this.heatmap
      .select('.axis-y')
      .select('.domain')
      .remove();
  }