绘制继承自 LineShape 的新曲线形状

Question

我使用 Microsoft.VisualBasic。PowerPacks。 LineShape 组件。 这个组件很好，但我想画一条曲线而不是一条直线。我开始修改 OnPaint：

    protected override void OnPaint(PaintEventArgs pevent)
    {
        //base.OnPaint(pevent);            
        pevent.Graphics.DrawLines(Pens.Green, new Point[] { 
            new Point(X1, Y1), new Point(40, 10), new Point(X2, Y2)});
    }

组件已正确绘制，但未检测到鼠标事件（单击、向下）。请帮忙，这是我的整个测试代码：

using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.VisualBasic.PowerPacks;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        private ShapeContainer shapeContainer1;

        public Form1()
        {
            this.shapeContainer1 = new PowerPacks.ShapeContainer();
            InitializeComponent();

            // add the shapeContainer1
            this.Controls.Add(this.shapeContainer1);

            // add a blue LineShape
            this.shapeContainer1.Shapes.Add(
                new LineShape(60, 10, 90, 70));
            (this.shapeContainer1.Shapes.get_Item(0) as LineShape).BorderColor = Color.Blue;

            // add a red (green in OnPaint) MyCourveShape
            this.shapeContainer1.Shapes.Add(
                new MyCourveShape(10, 10, 50, 50));
            (this.shapeContainer1.Shapes.get_Item(1) as MyCourveShape).BorderColor = Color.Red;
        }
    }

    public class MyCourveShape : Microsoft.VisualBasic.PowerPacks.LineShape
    {
        public MyCourveShape(int x1, int y1, int x2, int y2) 
        { 
            this.X1 = x1;
            this.X2 = x2;
            this.Y1 = y1;
            this.Y2 = y2; 
        }

        protected override void OnPaint(PaintEventArgs pevent)
        {
            //base.OnPaint(pevent);            
            pevent.Graphics.DrawLines(Pens.Green, new Point[] { 
                new Point(X1, Y1), new Point(40, 10), new Point(X2, Y2)});
        }

        protected override void OnClick(EventArgs e)
        {
            base.OnClick(e);
            MessageBox.Show("MyCourveShape clicked!");
        }
    }
}

Answer 1

您还必须重写 HitTest() 方法。基本实现仍然假设它是一条直线。