How to use the zrender/tool/area.getTextWidth function in zrender

//----------高亮
            status = 'emphasis';
            // label配置
            labelControl = itemStyle[status].label || labelControl;
            textStyle = labelControl.textStyle || textStyle;
            lineLength = itemStyle[status].labelLine.length || lineLength;
            labelControl.position = labelControl.position || itemStyle.normal.label.position;
            text = this.getLabelText(seriesIndex, dataIndex, status);
            textFont = this.getFont(textStyle);
            textColor = defaultColor;
            if (labelControl.position == 'inner' || labelControl.position == 'inside') {
                // 内部
                textAlign = 'center';
                textX = x + topWidth / 2;
                if (Math.max(topWidth, bottomWidth) / 2 > zrArea.getTextWidth(text, textFont)) {
                    textColor = '#fff';
                }
                else {
                    textColor = zrColor.reverse(defaultColor);
                }
            }
            else if (labelControl.position == 'left'){
                // 左侧显示
                textAlign = 'right';
                textX = lineLength == 'auto' 
                        ? (location.x - 10) 
                        : (location.centerX - Math.max(topWidth, bottomWidth) / 2 - lineLength);
            }
            else {
                // 右侧显示，默认 labelControl.position == 'outer' || 'right)
                textAlign = 'left';

var step = Math.floor(0.5 / gap);
                        step = step < 1 ? 1 : step;
                        interval = Math.floor(15 / gap);
                        while (!isEnough && interval < dataLength) {
                            interval += step;
                            isEnough = true;
                            labelSpace = Math.floor(gap * interval); // 标签左右至少间隔为3px
                            for (var i = Math.floor((dataLength - 1)/ interval) * interval; 
                                 i >= 0; i -= interval
                             ) {
                                if (this.option.axisLabel.rotate !== 0) {
                                    // 有旋转
                                    labelSize = fontSize;
                                }
                                else if (data[i].textStyle) {
                                    labelSize = zrArea.getTextWidth(
                                        this._getReformedLabel(i),
                                        this.getFont(
                                            zrUtil.merge(
                                                data[i].textStyle,
                                                this.option.axisLabel.textStyle
                                           )
                                        )
                                    );
                                }
                                else {
                                    /*
                                    labelSize = zrArea.getTextWidth(
                                        this._getReformedLabel(i),
                                        font
                                    );
                                    */

textShape._name = itemName;
                textShape = new TextShape(textShape);
                
                if (this.legendOption.selectedMode) {
                    itemShape.onclick = textShape.onclick = this._legendSelected;
                    itemShape.onmouseover =  textShape.onmouseover = this._dispatchHoverLink;
                    itemShape.hoverConnect = textShape.id;
                    textShape.hoverConnect = itemShape.id;
                }
                this.shapeList.push(itemShape);
                this.shapeList.push(textShape);

                if (this.legendOption.orient === 'horizontal') {
                    lastX += itemWidth + 5
                             + zrArea.getTextWidth(formattedName, dataFont)
                             + itemGap;
                }
                else {
                    lastY += itemHeight + itemGap;
                }
            }
        
            if (this.legendOption.orient === 'horizontal'
                && this.legendOption.x === 'center'
                && lastY != this._itemGroupLocation.y
            ) {
                // 多行橫排居中优化
                this._mLineOptimize();
            }
        },

if (dataRangeOption.orient == 'horizontal') {
                // 水平布局，计算总宽度
                if (dataRangeOption.text 
                    || dataRangeOption.splitNumber <= 0
                    || dataRangeOption.calculable
                ) {
                    // 指定文字或线性渐变
                    totalWidth = 
                        ((dataRangeOption.splitNumber <= 0
                          || dataRangeOption.calculable)
                          ? (itemWidth * 10 + itemGap)
                          : dataLength * (itemWidth + itemGap))
                        + (dataRangeOption.text 
                           && typeof dataRangeOption.text[0] != 'undefined'
                           ? (zrArea.getTextWidth(
                                  dataRangeOption.text[0],
                                  font
                              ) + _textGap)
                           : 0)
                        + (dataRangeOption.text
                           && typeof dataRangeOption.text[1] != 'undefined'
                           ? (zrArea.getTextWidth(
                                  dataRangeOption.text[1],
                                  font
                              ) + _textGap)
                           : 0);
                }
                else {
                    // 值标签
                    itemWidth += 5;
                    for (var i = 0; i < dataLength; i++) {

if (dataRangeOption.orient == 'vertical'
                        && dataRangeOption.x == 'right'
                    ) {
                        textShape.style.x -= (itemWidth + 10);
                        textShape.style.textAlign = 'right';
                    }
                    textShape._idx = i;
                    textShape.onclick = _dataRangeSelected;
                    self.shapeList.push(textShape);
                }

                if (dataRangeOption.orient == 'horizontal') {
                    lastX += itemWidth 
                             + (needValueText ? 5 : 0)
                             + (needValueText 
                               ? zrArea.getTextWidth(itemName, font)
                               : 0)
                             + itemGap;
                }
                else {
                    lastY += itemHeight + itemGap;
                }
            }
            
            if (!needValueText && dataRangeOption.text[1]) {
                if (dataRangeOption.orient == 'horizontal') {
                    lastX = lastX - itemGap + _textGap;
                }
                else {
                    lastY = lastY - itemGap + _textGap;
                }
                // 最后一个文字

_bulidHandle: function () {
            var x = this._calculableLocation.x;
            var y = this._calculableLocation.y;
            var width = this._calculableLocation.width;
            var height = this._calculableLocation.height;
            var font = this.getFont(this.dataRangeOption.textStyle);
            var textHeight = zrArea.getTextHeight('国', font);
            var textWidth = Math.max(zrArea.getTextWidth(this._textFormat(this.dataRangeOption.max), font), zrArea.getTextWidth(this._textFormat(this.dataRangeOption.min), font)) + 2;
            var pointListStart;
            var textXStart;
            var textYStart;
            var coverRectStart;
            var pointListEnd;
            var textXEnd;
            var textYEnd;
            var coverRectEnd;
            if (this.dataRangeOption.orient == 'horizontal') {
                if (this.dataRangeOption.y != 'bottom') {
                    pointListStart = [
                        [
                            x,
                            y
                        ],
                        [

var x = _calculableLocation.x;
            var y = _calculableLocation.y;
            var width = _calculableLocation.width;
            var height = _calculableLocation.height;
            
            var font = self.getFont(dataRangeOption.textStyle);
            var textHieght = zrArea.getTextWidth('国', font) + 2;
            var textWidth = Math.max(
                    zrArea.getTextWidth(
                        dataRangeOption.precision === 0
                        ? dataRangeOption.max
                        : dataRangeOption.max.toFixed(
                            dataRangeOption.precision
                          ),
                        font),
                    zrArea.getTextWidth(
                        dataRangeOption.precision === 0
                        ? dataRangeOption.min
                        : dataRangeOption.min.toFixed(
                            dataRangeOption.precision
                          ), 
                        font
                    )
                ) + 2;
                            
            var pointListStart;
            var textXStart;
            var textYStart;
            var pointListEnd;
            var textXEnd;
            var textYEnd;
            if (dataRangeOption.orient == 'horizontal') {

function _bulidHandle() {
            var x = _calculableLocation.x;
            var y = _calculableLocation.y;
            var width = _calculableLocation.width;
            var height = _calculableLocation.height;
            
            var font = self.getFont(dataRangeOption.textStyle);
            var textHieght = zrArea.getTextWidth('国', font) + 2;
            var textWidth = Math.max(
                    zrArea.getTextWidth(
                        dataRangeOption.precision === 0
                        ? dataRangeOption.max
                        : dataRangeOption.max.toFixed(
                            dataRangeOption.precision
                          ),
                        font),
                    zrArea.getTextWidth(
                        dataRangeOption.precision === 0
                        ? dataRangeOption.min
                        : dataRangeOption.min.toFixed(
                            dataRangeOption.precision
                          ), 
                        font
                    )

if (this.dataRangeOption.orient == 'horizontal') {
                if (this.dataRangeOption.text || this._isContinuity()) {
                    totalWidth = (this._isContinuity() ? itemWidth * mSize + itemGap : dataLength * (itemWidth + itemGap)) + (this.dataRangeOption.text && typeof this.dataRangeOption.text[0] != 'undefined' ? zrArea.getTextWidth(this.dataRangeOption.text[0], font) + this._textGap : 0) + (this.dataRangeOption.text && typeof this.dataRangeOption.text[1] != 'undefined' ? zrArea.getTextWidth(this.dataRangeOption.text[1], font) + this._textGap : 0);
                } else {
                    itemWidth += 5;
                    for (var i = 0; i < dataLength; i++) {
                        totalWidth += itemWidth + zrArea.getTextWidth(data[i], font) + itemGap;
                    }
                }
                totalWidth -= itemGap;
                totalHeight = Math.max(textHeight, itemHeight);
            } else {
                var maxWidth;
                if (this.dataRangeOption.text || this._isContinuity()) {
                    totalHeight = (this._isContinuity() ? itemHeight * mSize + itemGap : dataLength * (itemHeight + itemGap)) + (this.dataRangeOption.text && typeof this.dataRangeOption.text[0] != 'undefined' ? this._textGap + textHeight : 0) + (this.dataRangeOption.text && typeof this.dataRangeOption.text[1] != 'undefined' ? this._textGap + textHeight : 0);
                    maxWidth = Math.max(zrArea.getTextWidth(this.dataRangeOption.text && this.dataRangeOption.text[0] || '', font), zrArea.getTextWidth(this.dataRangeOption.text && this.dataRangeOption.text[1] || '', font));
                    totalWidth = Math.max(itemWidth, maxWidth);
                } else {
                    totalHeight = (itemHeight + itemGap) * dataLength;
                    itemWidth += 5;
                    maxWidth = 0;
                    for (var i = 0; i < dataLength; i++) {
                        maxWidth = Math.max(maxWidth, zrArea.getTextWidth(data[i], font));
                    }
                    totalWidth = itemWidth + maxWidth;
                }
                totalHeight -= itemGap;
            }
            var padding = this.reformCssArray(this.dataRangeOption.padding);
            var x;
            var zrWidth = this.zr.getWidth();
            switch (this.dataRangeOption.x) {

if (this.dataRangeOption.orient == 'horizontal') {
                if (this.dataRangeOption.text || this._isContinuity()) {
                    totalWidth = (this._isContinuity() ? itemWidth * mSize + itemGap : dataLength * (itemWidth + itemGap)) + (this.dataRangeOption.text && typeof this.dataRangeOption.text[0] != 'undefined' ? zrArea.getTextWidth(this.dataRangeOption.text[0], font) + this._textGap : 0) + (this.dataRangeOption.text && typeof this.dataRangeOption.text[1] != 'undefined' ? zrArea.getTextWidth(this.dataRangeOption.text[1], font) + this._textGap : 0);
                } else {
                    itemWidth += 5;
                    for (var i = 0; i < dataLength; i++) {
                        totalWidth += itemWidth + zrArea.getTextWidth(data[i], font) + itemGap;
                    }
                }
                totalWidth -= itemGap;
                totalHeight = Math.max(textHeight, itemHeight);
            } else {
                var maxWidth;
                if (this.dataRangeOption.text || this._isContinuity()) {
                    totalHeight = (this._isContinuity() ? itemHeight * mSize + itemGap : dataLength * (itemHeight + itemGap)) + (this.dataRangeOption.text && typeof this.dataRangeOption.text[0] != 'undefined' ? this._textGap + textHeight : 0) + (this.dataRangeOption.text && typeof this.dataRangeOption.text[1] != 'undefined' ? this._textGap + textHeight : 0);
                    maxWidth = Math.max(zrArea.getTextWidth(this.dataRangeOption.text && this.dataRangeOption.text[0] || '', font), zrArea.getTextWidth(this.dataRangeOption.text && this.dataRangeOption.text[1] || '', font));
                    totalWidth = Math.max(itemWidth, maxWidth);
                } else {
                    totalHeight = (itemHeight + itemGap) * dataLength;
                    itemWidth += 5;
                    maxWidth = 0;
                    for (var i = 0; i < dataLength; i++) {
                        maxWidth = Math.max(maxWidth, zrArea.getTextWidth(data[i], font));
                    }
                    totalWidth = itemWidth + maxWidth;
                }
                totalHeight -= itemGap;
            }
            var padding = this.reformCssArray(this.dataRangeOption.padding);
            var x;
            var zrWidth = this.zr.getWidth();
            switch (this.dataRangeOption.x) {