drawCrossLineText method

@override void drawCrossLineText(Canvas canvas, Size size)

draw the cross line. when user focus

Implementation

@override
void drawCrossLineText(Canvas canvas, Size size) {
  var index = calculateSelectedX(selectX);
  KLineEntity point = getItem(index);

  TextPainter tp = getTextPainter(
    NumberUtil.formatFixed(point.close, fixedLength),
    chartColors.crossTextColor,
  );
  double textHeight = tp.height;
  double textWidth = tp.width;

  double w1 = 5;
  double w2 = 3;
  double r = textHeight / 2 + w2;
  double y = getMainY(point.close);
  double x;
  double space = 4.0;
  bool isLeft = false;
  if (translateXtoX(getX(index)) < mWidth / 2) {
    isLeft = false;
    x = space;
    RRect rect = RRect.fromLTRBR(
      x,
      y - r,
      x + textWidth + 2 * w1,
      y + r,
      Radius.circular(2.0),
    );
    canvas.drawRRect(rect, selectPointPaint);
    canvas.drawRRect(rect, selectorBorderPaint);
    tp.paint(canvas, Offset(x + w1, y - textHeight / 2));
  } else {
    isLeft = true;
    x = mWidth - textWidth - 2 * w1 - space;
    RRect rect = RRect.fromLTRBR(
      x,
      y - r,
      mWidth - space,
      y + r,
      Radius.circular(2.0),
    );
    canvas.drawRRect(rect, selectPointPaint);
    canvas.drawRRect(rect, selectorBorderPaint);
    tp.paint(canvas, Offset(x + w1, y - textHeight / 2));
  }

  TextPainter dateTp =
      getTextPainter(getDate(point.time), chartColors.crossTextColor);
  textWidth = dateTp.width;
  r = textHeight / 2;
  x = translateXtoX(getX(index));
  y = mDateRect.top;

  if (x < textWidth + 2 * w1) {
    x = 1 + textWidth / 2 + w1;
  } else if (mWidth - x < textWidth + 2 * w1) {
    x = mWidth - 1 - textWidth / 2 - w1;
  }

  RRect rectBox = RRect.fromLTRBR(
    x - textWidth / 2 - w1,
    y,
    x + textWidth / 2 + w1,
    mDateRect.bottom,
    Radius.circular(2.0),
  );

  // double baseLine = textHeight / 2;
  canvas.drawRRect(
    rectBox,
    selectPointPaint,
  );
  canvas.drawRRect(
    rectBox,
    selectorBorderPaint,
  );

  dateTp.paint(
    canvas,
    Offset(
      x - textWidth / 2,
      mDateRect.top + (mDateRect.height - dateTp.height) / 2,
    ),
  );

  //Long press to display the details of this data
  sink.add(InfoWindowEntity(point, isLeft: isLeft));
}