drawCrossLine method

void drawCrossLine(Canvas canvas, Size size)

画交叉线

Implementation

void drawCrossLine(Canvas canvas, Size size) {
  // 使用手指位置而不是数据点位置
  double x = selectX;
  double y = selectY;

  // 确保十字线在图表区域内
  if (y < mTopPadding) y = mTopPadding;
  if (y > size.height - mBottomPadding) y = size.height - mBottomPadding;

  // 创建虚线画笔 - 竖线
  Paint paintY = Paint()
    ..color = this.chartColors.hCrossColor // 使用横线相同的颜色确保可见性
    ..strokeWidth = this.chartStyle.hCrossWidth // 使用合适的宽度，而不是过宽的vCrossWidth
    ..isAntiAlias = true
    ..style = PaintingStyle.stroke
    ..strokeCap = StrokeCap.round;

  // 绘制竖线（纵向线） - 使用虚线
  _drawDashedLine(
    canvas,
    Offset(x, mTopPadding),
    Offset(x, size.height - mBottomPadding),
    paintY,
  );

  // 创建虚线画笔 - 横线
  Paint paintX = Paint()
    ..color = this.chartColors.hCrossColor // 使用横线颜色
    ..strokeWidth = this.chartStyle.hCrossWidth // 使用横线宽度
    ..isAntiAlias = true
    ..style = PaintingStyle.stroke
    ..strokeCap = StrokeCap.round;

  // 绘制横线 - 使用虚线（只在主图区域绘制）
  _drawDashedLine(
    canvas,
    Offset(0, y),
    Offset(size.width, y),
    paintX,
  );

  // 绘制中心点 - 简化设计，只要内圈实心圆圈
  canvas.drawCircle(
    Offset(x, y),
    2.0, // 半径2.0
    Paint()
      ..color = this.chartColors.hCrossColor
      ..style = PaintingStyle.fill
      ..isAntiAlias = true,
  );
}