OTS/OTSIncAMeasureApp/4-OTSSamplespaceGraphicsPanel/VisualGDIObjects/CRingGDIObject.cs

using OTSMeasureApp._4_OTSSamplespaceGraphicsPanel.VisualGDIObjects;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace OTSMeasureApp._4_OTSSamplespaceGraphicsPanel
{
    class CRingGDIObject : CMeasureArea
    {
        private float ringWidth = 10;//the distance between outline circle and inside circle.

        public float GetRingWidth()
        {
            return ringWidth * m_zoomNum;
        }

        public void SetRingWidth(float value)
        {
            ringWidth = value;
        }

        public CRingGDIObject(RectangleF rect, string holename, string name, Color selColor)
        {

            m_OrigineRegionF = rect;
            SetInitRegionF(m_OrigineRegionF);

            sampleName = name;
            nameOrHoleName = holename;
            SelColor = selColor;
            ID = System.Guid.NewGuid().ToString();

        }
        public override void OnPaint(PaintEventArgs e)
        {

            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;  //图片柔顺模式选择
            e.Graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;//高质量
            e.Graphics.CompositingQuality = CompositingQuality.HighQuality;//再加一点

            e.Graphics.DrawEllipse(Pens.Red, m_RegionF);
            RectangleF insideRegine = new RectangleF();

            insideRegine.X = m_RegionF.X + GetRingWidth();
            insideRegine.Y = m_RegionF.Y + GetRingWidth();
            insideRegine.Width = m_RegionF.Width - GetRingWidth() * 2;
            insideRegine.Height = m_RegionF.Height - GetRingWidth() * 2;


            e.Graphics.DrawEllipse(Pens.Red, insideRegine);

            if (subItems.Count != 0)
            {
                foreach (var item in subItems)
                {
                    item.OnPaint(e);
                }

            }
        }

        private GraphicsPath GetInsideCirclePath()
        {
            RectangleF insideRegine = new RectangleF();
            insideRegine.X = m_OrigineRegionF.X + ringWidth;
            insideRegine.Y = m_OrigineRegionF.Y + ringWidth;
            insideRegine.Width = m_OrigineRegionF.Width - ringWidth * 2;
            insideRegine.Height = m_OrigineRegionF.Height - ringWidth * 2;
            GraphicsPath GPath = new GraphicsPath();
            GPath.AddEllipse(insideRegine);
            return GPath;
        }


        private bool ifRectangleIntersect(CDisplayGDIObject otherUnZoomgdi)
        {
            var path = GetInsideCirclePath();//the inside circle is the blank area that there's no field rect.
            var vertexPoints = otherUnZoomgdi.GetOriginalRegionVertexPoints();
            foreach (var p in vertexPoints)
            {
                if (!path.IsVisible(p))
                {
                    return true;
                }

            }
            return false;
        }
       

        override public void AddSubItems(CVisualFieldGDIObject item)
        {
            if (subItems == null) subItems = new List<CVisualFieldGDIObject>();
            if (ifRectangleIntersect(item))
            {
                var r = item;
                r.SequenceNum = subItems.Count ;
                subItems.Add(item);
            }


        }

    }
}