LIBMAS/Annotation/FieldView/ViewSquare.cs

using PaintDotNet.Annotation.Enum;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Globalization;
using System.Runtime.Serialization;
using System.Windows.Forms;

namespace PaintDotNet.Annotation.FieldView
{
    /// <summary>
    /// 正方形视场绘制
    /// </summary>
    public class ViewSquare : ViewBase
    {
        public override double Width
        {
            get { return Rectangle.Width; }
            set
            {
                MoveHandleTo(new Point((int)(Points[0].X + value), (int)(Points[0].Y + value)), 3);
            }
        }

        #region Constructor
        public ViewSquare()
        {
            objectType = DrawClass.View;
            drawToolType = DrawToolType.ViewSquare;
            Initialize();
        }

        public ViewSquare(int x, int y) : this()
        {
            for (int i = 0; i < 4; i++) AddPoint(x, y);
        }

        public ViewSquare(List<PointF> points) : this()
        {
            Points = points;
        }
        #endregion

        #region Handles
        public override int HandleCount => Points.Count;

        public override PointF GetHandle(int handleIndex)
        {
            return Points[handleIndex - 1];
        }

        public override Cursor GetHandleCursor(int handleNumber)
        {
            switch (handleNumber)
            {
                case 1:
                    return Cursors.SizeNWSE;
                case 2:
                    return Cursors.SizeNESW;
                case 3:
                    return Cursors.SizeNWSE;
                case 4:
                    return Cursors.SizeNESW;
                default:
                    return Cursors.Default;
            }
        }

        public override void MoveHandleTo(Point point, int handleNumber)
        {
            MoveCorner(point, handleNumber - 1);
            OnPropertyChanged();
        }

        private void MoveCorner(Point point, int i)
        {
            var p0 = Points[(i + 2) % 4];
            var lenX = point.X - p0.X;
            var lenY = point.Y - p0.Y;
            var len = Math.Max(Math.Abs(lenX), Math.Abs(lenY));

            lenX = lenX > 0 ? len : -len;
            lenY = lenY > 0 ? len : -len;

            Points[i] = new PointF(p0.X + lenX, p0.Y + lenY);
            if (i % 2 == 0)
            {
                Points[(i + 1) % 4] = new PointF(p0.X + lenX, p0.Y);
                Points[(i + 3) % 4] = new PointF(p0.X, p0.Y + lenY);
            }
            else
            {
                Points[(i + 3) % 4] = new PointF(p0.X + lenX, p0.Y);
                Points[(i + 1) % 4] = new PointF(p0.X, p0.Y + lenY);
            }
        }
        #endregion

        #region Clone
        public override DrawObject Clone()
        {
            return Clone(ISurfaceBox);
        }

        /// <summary>
        /// Clone this instance
        /// </summary>
        public override DrawObject Clone(ISurfaceBox surfaceBox)
        {
            ViewSquare drawRectangle = new ViewSquare(Points);
            drawRectangle.ISurfaceBox = surfaceBox;
            drawRectangle.combineMode = this.combineMode;
            drawRectangle.Color = Color;
            drawRectangle.ID = ID;
            FillDrawObjectFields(drawRectangle);
            return drawRectangle;
        }
        #endregion

    }
}