drawNowPrice method

@override void drawNowPrice(Canvas canvas)

draw the current price

Implementation

@override
void drawNowPrice(Canvas canvas) {
  if (!this.showNowPrice) {
    return;
  }

  if (datas == null) {
    return;
  }

  double value = datas!.last.close;
  double y = getMainY(value);

  //view display area boundary value drawing
  if (y > getMainY(mMainLowMinValue)) {
    y = getMainY(mMainLowMinValue);
  }

  if (y < getMainY(mMainHighMaxValue)) {
    y = getMainY(mMainHighMaxValue);
  }

  Color priceColor = value >= datas!.last.open
      ? this.chartColors.nowPriceUpColor
      : this.chartColors.nowPriceDnColor;

  nowPriceSelectorBorderPaint.color = priceColor;
  nowPriceLinePaint.color = priceColor;

  //first draw the horizontal line
  canvas.drawDashLine(
    Offset(0, y),
    Offset(-mTranslateX + mWidth / scaleX, y),
    nowPriceLinePaint,
  );

  //repaint the background and text
  TextPainter tp = getTextPainter(
    NumberUtil.formatFixed(value, fixedLength) ?? '',
    priceColor,
  );

  double paddingX = 3, paddingY = 1.5;
  double space = 5.0;
  double offsetX;
  switch (verticalTextAlignment) {
    case VerticalTextAlignment.left:
      // offsetX = paddingX;
      offsetX = space;
      break;
    case VerticalTextAlignment.right:
      offsetX = mWidth - tp.width - paddingX * 2 - space;
      break;
  }

  double top = y - tp.height / 2;
  RRect rect = RRect.fromLTRBR(
    offsetX,
    top - paddingY,
    offsetX + tp.width + paddingX * 2,
    top + tp.height + paddingY * 2,
    Radius.circular(2.0),
  );
  canvas.drawRRect(
    rect,
    nowPriceSelectorPaint,
  );
  canvas.drawRRect(
    rect,
    nowPriceSelectorBorderPaint,
  );
  tp.paint(
    canvas,
    Offset(offsetX + paddingX, top),
  );
}