Method fit

src/core/core.scale.js:634–687

()

    call(this.options.beforeFit, [this]);
  }
  fit() {
    // Reset
    const minSize = {
      width: 0,
      height: 0
    };

    const {chart, options: {ticks: tickOpts, title: titleOpts, grid: gridOpts}} = this;
    const display = this._isVisible();
    const isHorizontal = this.isHorizontal();

    if (display) {
      const titleHeight = getTitleHeight(titleOpts, chart.options.font);
      if (isHorizontal) {
        minSize.width = this.maxWidth;
        minSize.height = getTickMarkLength(gridOpts) + titleHeight;
      } else {
        minSize.height = this.maxHeight; // fill all the height
        minSize.width = getTickMarkLength(gridOpts) + titleHeight;
      }

      // Don't bother fitting the ticks if we are not showing the labels
      if (tickOpts.display && this.ticks.length) {
        const {first, last, widest, highest} = this._getLabelSizes();
        const tickPadding = tickOpts.padding * 2;
        const angleRadians = toRadians(this.labelRotation);
        const cos = Math.cos(angleRadians);
        const sin = Math.sin(angleRadians);

        if (isHorizontal) {
        // A horizontal axis is more constrained by the height.
          const labelHeight = tickOpts.mirror ? 0 : sin * widest.width + cos * highest.height;
          minSize.height = Math.min(this.maxHeight, minSize.height + labelHeight + tickPadding);
        } else {
        // A vertical axis is more constrained by the width. Labels are the
        // dominant factor here, so get that length first and account for padding
          const labelWidth = tickOpts.mirror ? 0 : cos * widest.width + sin * highest.height;

          minSize.width = Math.min(this.maxWidth, minSize.width + labelWidth + tickPadding);
        }
        this._calculatePadding(first, last, sin, cos);
      }
    }

    this._handleMargins();

    if (isHorizontal) {
      this.width = this._length = chart.width - this._margins.left - this._margins.right;
      this.height = minSize.height;
    } else {
      this.width = minSize.width;
      this.height = this._length = chart.height - this._margins.top - this._margins.bottom;
    }
  }

  _calculatePadding(first, last, sin, cos) {
    const {ticks: {align, padding}, position} = this.options;