如何画出隧道般的效果？

Question

我知道如何在 GDI 中绘制东西，但我发现很难确定如何绘制不仅仅是正方形和圆形的实际形状。

我正在尝试通过绘制一大堆相互重叠的正方形或矩形来绘制隧道，但我不知道如何正确定位。

这种效果怎么画？

Answer 1

你可以试试这样的。一旦您了解了如何使用 GDI 进行绘图的基础知识，您应该能够非常轻松地完成此类操作。

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

namespace Autodraw
{
    public partial class Form1 : Form
    {
        private bool canDraw;

        public class NPanel : Panel
        {
            protected override bool DoubleBuffered
            {
                get
                {
                    return base.DoubleBuffered;
                }

                set
                {
                    base.DoubleBuffered = true;
                }
            }
        }

        public NPanel nPanel = new NPanel();

        public Form1()
        {
            InitializeComponent();

            this.DoubleBuffered = true;
            panel = nPanel;
        }

        private void panel_Paint(object sender, PaintEventArgs e)
        {
            if (canDraw)
            {
                for (int r = 0; r <= 255; r++)
                {
                    e.Graphics.DrawRectangle(new Pen(Color.FromArgb(r, 0, 0), 1), r, r, r, r);
                }

                for (int r = 0; r <= 255; r++)
                {
                    e.Graphics.DrawRectangle(new Pen(Color.FromArgb(0, r, 0), 1), r, r, r, r);
                }

                for (int r = 0; r <= 255; r++)
                {
                    e.Graphics.DrawRectangle(new Pen(Color.FromArgb(0, 0, r), 1), r, r, r, r);
                }
            }
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            this.Refresh();
        }

        private void Form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if(e.KeyChar == (char)Keys.Escape)
            {
                timer.Stop();
                canDraw = false;
            }
        }

        private void Form1_Shown(object sender, EventArgs e)
        {
            canDraw = true;
            timer.Start();
        }
    }
}