drawCrossLineText method

@override void drawCrossLineText(Canvas canvas, Size size)

Implementation

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

  TextPainter tp = getTextPainter(point.close, 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;
  bool isLeft = false;
  if (translateXtoX(getX(index)) < mWidth / 2) {
    isLeft = false;
    x = 1;
    Path path = new Path();
    path.moveTo(x, y - r);
    path.lineTo(x, y + r);
    path.lineTo(textWidth + 2 * w1, y + r);
    path.lineTo(textWidth + 2 * w1 + w2, y);
    path.lineTo(textWidth + 2 * w1, y - r);
    path.close();
    canvas.drawPath(path, selectPointPaint);
    canvas.drawPath(path, selectorBorderPaint);
    tp.paint(canvas, Offset(x + w1, y - textHeight / 2));
  } else {
    isLeft = true;
    x = mWidth - textWidth - 1 - 2 * w1 - w2;
    Path path = new Path();
    path.moveTo(x, y);
    path.lineTo(x + w2, y + r);
    path.lineTo(mWidth - 2, y + r);
    path.lineTo(mWidth - 2, y - r);
    path.lineTo(x + w2, y - r);
    path.close();
    canvas.drawPath(path, selectPointPaint);
    canvas.drawPath(path, selectorBorderPaint);
    tp.paint(canvas, Offset(x + w1 + w2, y - textHeight / 2));
  }

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

  if (x < textWidth + 2 * w1) {
    x = 1 + textWidth / 2 + w1;
  } else if (mWidth - x < textWidth + 2 * w1) {
    x = mWidth - 1 - textWidth / 2 - w1;
  }
  double baseLine = textHeight / 2;
  canvas.drawRect(
      Rect.fromLTRB(x - textWidth / 2 - w1, y, x + textWidth / 2 + w1,
          y + baseLine + r),
      selectPointPaint);
  canvas.drawRect(
      Rect.fromLTRB(x - textWidth / 2 - w1, y, x + textWidth / 2 + w1,
          y + baseLine + r),
      selectorBorderPaint);

  dateTp.paint(canvas, Offset(x - textWidth / 2, y));
  //长按显示这条数据详情
  sink?.add(InfoWindowEntity(point, isLeft: isLeft));
}