drawSpecialPointHintLine static method

void drawSpecialPointHintLine(Canvas canvas, PointModel pointModel, double startX, double endX, double startY, double endY,)

绘制某点处的辅助线，并特殊点高亮处理

Implementation

static void drawSpecialPointHintLine(Canvas canvas, PointModel pointModel,
    double startX, double endX, double startY, double endY) {
  if (pointModel.cellPointSet.hintEdgeInset != HintEdgeInset.none) {
    var hintEdgeInset = pointModel.cellPointSet.hintEdgeInset;
    if (hintEdgeInset.left != null) {
      drawline(
          canvas,
          pointModel.offset,
          Offset(startX, pointModel.offset.dy),
          hintEdgeInset.left!.isHintLineImaginary,
          hintEdgeInset.left!.hintColor,
          hintEdgeInset.left!.hintLineWidth);
    }
    if (hintEdgeInset.right != null) {
      drawline(
          canvas,
          pointModel.offset,
          Offset(endX, pointModel.offset.dy),
          hintEdgeInset.right!.isHintLineImaginary,
          hintEdgeInset.right!.hintColor,
          hintEdgeInset.right!.hintLineWidth);
    }
    if (hintEdgeInset.top != null) {
      drawline(
          canvas,
          pointModel.offset,
          Offset(pointModel.offset.dx, endY),
          hintEdgeInset.top!.isHintLineImaginary,
          hintEdgeInset.top!.hintColor,
          hintEdgeInset.top!.hintLineWidth);
    }
    if (hintEdgeInset.bottom != null) {
      drawline(
          canvas,
          pointModel.offset,
          Offset(pointModel.offset.dx, startY),
          hintEdgeInset.bottom!.isHintLineImaginary,
          hintEdgeInset.bottom!.hintColor,
          hintEdgeInset.bottom!.hintLineWidth);
    }
  }
  var centerPointOffset = pointModel.cellPointSet.centerPointOffset;
  if (centerPointOffset != Offset.zero) {
    drawline(
        canvas,
        pointModel.offset,
        Offset(pointModel.offset.dx + centerPointOffset.dx,
            pointModel.offset.dy + centerPointOffset.dy),
        true,
        pointModel.cellPointSet.centerPointOffsetLineColor,
        2);
  }
  drawSpecialPoint(canvas, pointModel, centerPointOffset);
}