formcurve.cs

来自「csharp课本的源代码」· CS 代码 · 共 88 行

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace DrawCurveExample
{
    public partial class FormCurve : Form
    {
        public FormCurve()
        {
            InitializeComponent();
        }

        private void FormCurve_Paint(object sender, PaintEventArgs e)
        {
            //创建Graphics对象
            Graphics g = e.Graphics;
            // 创建一支红色的笔
            Pen redPen = new Pen(Color.Red, 3);
            // 定义组成曲线的点
            Point[] curve1points =
         {
             new Point (150,100),new Point (200,50),
             new Point (250,100),new Point (300,50)
         };
            g.DrawCurve(redPen, curve1points);
            // 创建一支黑色的笔
            Pen blackPen = new Pen(Color.Black, 3);
            //定义曲线强度
            // 定义组成曲线的点
            Point[] curve2points =
    {
         new Point (350,100),
         new Point (400,50),
         new Point (450,100),
             new Point (500,50)
         };
            float tension = 1.0f;
            g.DrawCurve(blackPen, curve2points, tension);
            // 定义组成曲线的点
            Point[] curve3points =
        {
            new Point (150,200),
            new Point (200,150),
            new Point (250,200),
            new Point (300,150)
        };
            g.DrawClosedCurve(redPen, curve3points);
            // 定义组成曲线的点
            Point[] curve4points =
        {
            new Point (350,200),
            new Point (400,150),
            new Point (450,200),
            new Point (500,150)
        };
            float tension1 = 1.0f;
            FillMode afillmode = FillMode.Alternate;
            g.DrawClosedCurve(redPen, curve4points, tension1, afillmode);
            // 定义组成贝塞尔曲线的点
            Point istart = new Point(150, 300);
            Point icontrol1 = new Point(200, 180);
            Point icontrol2 = new Point(250, 250);
            Point iend = new Point(300, 300);
            // 绘制贝塞尔曲线
            g.DrawBezier(blackPen, istart, icontrol1, icontrol2, iend);
            // 定义组成贝塞尔曲线的点
            Point jstart = new Point(350, 300);
            Point jcontrol1 = new Point(400, 200);
            Point jcontrol2 = new Point(420, 250);
            Point jend1 = new Point(440, 300);
            Point jcontrol3 = new Point(460, 360);
            Point jcontrol4 = new Point(480, 400);
            Point jend2 = new Point(500, 300);
            Point[] bezierpoints =
        {
              jstart,jcontrol1,jcontrol2,jend1,jcontrol3,jcontrol4,jend2
        };
            // 绘制贝塞尔曲线
            g.DrawBeziers(redPen, bezierpoints);

        }
    }
}