kev/Drawer/Module/GeoSigmaViewer/DrawToolCurve.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Drawing;
using System.ComponentModel;

namespace GeoSigmaViewer
{
    //绘制多段线:此线可包含直线段、圆弧、三次样条曲线。
    public class DrawToolCurve : DrawTool
    {
        private MouseMoveResult mmResult;
        public DrawToolCurve()
        {
            ToolCursor = DrawCursors.CurveDraw;
            ItemType = DrawItemType.ITEM_CURVE;
            mmResult = new MouseMoveResult();
        }
        public override void Start()
        {
            drawer.ChangeContextMenu(DrawToolType.Curve);
        }
        public override void End()
        {
            drawer.ChangeContextMenu(DrawToolType.Select);
        }

        public override void Execute(string cmdString)
        {
            switch(cmdString)
            {
                case "cancel":
                    {
                        drawer.Geo.CancelCurve();
                        drawer.Geo.EnableRedraw(true);
                        drawer.ReDraw();
                    }
                    break;
                case "end":
                    {
                        drawer.Geo.EndCurve();
                        drawer.Geo.EnableRedraw(true);
                        drawer.ReDraw();
                    }
                    break;
                case "autoclose":
                    {
                        drawer.Geo.AutoCloseCurve();
                        drawer.Geo.EnableRedraw(true);
                        drawer.ReDraw();
                    }
                    break;
                case "merge":
                    {
                        drawer.Geo.ChangeCurveMergeState();
                        drawer.Geo.EnableRedraw(true);
                        drawer.ReDraw();
                    }
                    break;
                case "next":
                    {
                        drawer.Geo.DrawNextCurve();
                        drawer.Geo.EnableRedraw(true);
                        drawer.ReDraw();
                    }
                    break;
                default:
                    break;
            }
            
        }
        public override void OnLButtonDown(Drawer drawArea, MouseEventArgs e)
        {
            drawArea.Geo.OnLButtonDown(e.X, e.Y);
            //base.OnLButtonDown(drawArea, e);
        }

        public override void OnLButtonUp(Drawer drawArea, MouseEventArgs e)
        {
            drawArea.Geo.OnLButtonUp(e.X, e.Y);
            drawArea.Geo.EnableRedraw(true);
            // 不用刷新，结束时刷新一次就行。
            //drawArea.ReDraw();
        }

        public override void OnMouseMove(Drawer drawArea, MouseEventArgs e)
        {
            //if (e.Button == MouseButtons.Left)
            {
                Graphics g = drawArea.CreateGraphics();
                drawArea.Geo.ItemMouseMove(g.GetHdc(), e.X, e.Y, ref mmResult);
            }
        }
    }
}