ZedGraph 解决标注数字拖拽超出谱图区域问题

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通过修改源码解决这个问题
1.修改GraphPane.cs
增加 MasterPane变量用于接收 MasterPane对象信息传输，因为要使用到MasterPane对象中计位置的方法

 private MasterPane _masterPane;
public MasterPane MasterPane
{
            get { return _masterPane; }
            set { _masterPane = value; }
} 

2.修改MasterPane.cs 将当前对象在绘制文字的时候传输到GraphPane对象中

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3.修改GraphObjList.cs 文件
增加 MasterPane变量用于接收 MasterPane对象信息传输

 private MasterPane _masterPane;
public MasterPane MasterPane
{
            get { return _masterPane; }
            set { _masterPane = value; }
} 

增加计算方法

  /// <summary>
        /// 计算是否显示文本
        /// </summary>
        /// <param name="g"></param>
        /// <param name="pix"></param>
        /// <param name="textObj"></param>
        /// <param name="scaleFactor"></param>
        /// <returns></returns>
        private bool CalcIsShowText(Graphics g, PointF pix, TextObj textObj, float scaleFactor)
        {
            //获取文字的高度
            SizeF fontSize = textObj.FontSpec.MeasureString(g, textObj.Text, scaleFactor);
            float orgY = pix.Y;
            float orgX = pix.X;
            double textPointMaxX = orgX + fontSize.Width/2;
            double textPointMinX = orgX - fontSize.Width/2;
            double textPointMinY = orgY - fontSize.Height;
            double textPointMaxY = orgY;
            foreach (GraphPane pane in _masterPane.PaneList)
            {
                double startChartX = pane.Chart._rect.X;
                double maxX = pane.Chart._rect.X + pane.Chart._rect.Width;
                double minX = pane.Chart._rect.X;

                double maxY = pane.Chart._rect.Y + pane.Chart._rect.Height;
                double minY = pane.Chart._rect.Y;
                if ((textPointMinX > minX && textPointMaxX < maxX) && (textPointMinY > minY && textPointMaxY < maxY))
                {
                    return true;
                }
            }
            return false;
        }

修改 Draw 方法

public void Draw(Graphics g, PaneBase pane, float scaleFactor,
                            ZOrder zOrder)
        {
            // Draw the items in reverse order, so the last items in the
            // list appear behind the first items (consistent with
            // CurveList)
            for (int i = this.Count - 1; i >= 0; i--)
            {
                GraphObj item = this[i];
                TextObj textObj = (TextObj)this[i];
                if (item.ZOrder == zOrder && item.IsVisible)
                {
                    PointF pix = item.Location.Transform(pane);
                    if (!CalcIsShowText(g, pix, textObj, scaleFactor))
                    {
                        continue;
                    }
                    Region region = null;
                    if (item.IsClippedToChartRect && pane is GraphPane)
                    {
                        region = g.Clip.Clone();
                        g.SetClip(((GraphPane)pane).Chart._rect);
                    }

                    item.Draw(g, pane, scaleFactor);

                    if (item.IsClippedToChartRect && pane is GraphPane)
                        g.Clip = region;
                }
            }
        }

修改完成 ，运行效果

image.png