C#—图形图像编程基础

朱雀 2022-08-23 05:46 206阅读 0赞

/*
     * 绘制要求的线；
     */
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;
    using System.Drawing.Drawing2D;
    
    namespace WindowsFormsApplication2
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
    
            private void Form1_Load(object sender, EventArgs e)
            {
    
            }
    
            private void Form1_Paint(object sender, PaintEventArgs e)
            {
                Graphics g = e.Graphics;
                Pen p = new Pen(Color.CadetBlue, 10.5f);
                g.DrawString("蓝色，宽度为10.5", this.Font, new SolidBrush(Color.CadetBlue), new PointF(5.0f, 10.0f));
                g.DrawLine(p, new Point(110, 10), new PointF(380, 10));
    
                p.Width = 2;
                p.Color = Color.Red;
                g.DrawString("红色，宽度为2", this.Font, new SolidBrush(Color.Black), 5,25);
                g.DrawLine(p, new Point(110, 30), new PointF(380, 30));
    
                p.StartCap = LineCap.Flat;
                p.EndCap = LineCap.ArrowAnchor;
                p.Width = 9;
                g.DrawString("红色箭头线", this.Font, new SolidBrush(Color.Black), 5, 45);
                g.DrawLine(p, new Point(110, 50), new PointF(380, 50));
    
                p.DashStyle = DashStyle.Custom;
                p.DashPattern = new float[] { 4, 4 };
                p.Width = 2;
                p.EndCap = LineCap.NoAnchor;
                g.DrawString("自定义虚线", this.Font, new SolidBrush(Color.Black), 5, 65);
                g.DrawLine(p, new Point(110, 70), new PointF(380, 70));
    
                p.DashStyle = DashStyle.Dot;
                g.DrawString("点划线", this.Font, new SolidBrush(Color.Black), 5, 85);
                g.DrawLine(p, new Point(110, 90), new Point(380, 90));
            }
        }
    }

运行结果：

![Center][]

/*
     * 纹理画刷TextureBrush类应用实例：将一副名为b.png的图像添加到项目中，
     * 并设置其“复制到输出目录”属性为“如果较新则复制”；
     */
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;
    using System.Drawing.Drawing2D;
    
    namespace WindowsFormsApplication2
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
    
            private void Form1_Load(object sender, EventArgs e)
            {
    
            }
    
            private void Form1_Paint(object sender, PaintEventArgs e)
            {
                Graphics g = e.Graphics;
                Bitmap bitmap = new Bitmap(Application.StartupPath + @"\b.png");   //创建Bitmap对象
                bitmap = new Bitmap(bitmap, this.ClientRectangle.Size);     //将其缩放到当前窗体大小
                TextureBrush brush = new TextureBrush(bitmap);
                g.FillEllipse(brush, this.ClientRectangle);
                g.Dispose();
            }
        }
    }

运行结果：

![Center 1][]

/*
     * 图案画刷HatchBrush类应用。该画刷使用90%的阴影，前景色与背景色的比例为90：100，并使用白色作为前景色，红色作为背景色.
     */
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;
    using System.Drawing.Drawing2D;
    
    namespace WindowsFormsApplication2
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
    
            private void Form1_Load(object sender, EventArgs e)
            {
    
            }
    
            private void Form1_Paint(object sender, PaintEventArgs e)
            {
                Graphics g = e.Graphics;
                HatchBrush brush = new HatchBrush(HatchStyle.Percent90, Color.White, Color.Red);
                g.FillEllipse(brush, new Rectangle(10, 10, 300, 100));
            }
        }
    }

运行结果:

![Center 2][]

/*
     * LinearGradientBrush类创建渐变画刷实例。实现由白色渐变到黑色.
     */
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;
    using System.Drawing.Drawing2D;
    
    namespace WindowsFormsApplication2
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
    
            private void Form1_Load(object sender, EventArgs e)
            {
    
            }
    
            private void Form1_Paint(object sender, PaintEventArgs e)
            {
                Graphics g = e.Graphics;
                LinearGradientBrush brush1 = new LinearGradientBrush(this.ClientRectangle, Color.White, Color.Black, LinearGradientMode.Vertical);
                g.FillRectangle(brush1, this.ClientRectangle);
                g.Dispose();
            }
        }
    }

运行结果：

![Center 3][]

[Center]: /images/20220721/f4d590fbaa2c44ff8e49f8aa81360875.png
[Center 1]: /images/20220721/1c816d63837f4921959a735037297d5a.png
[Center 2]: /images/20220721/66b403ac0a18459baf924291e9ab42c0.png
[Center 3]: /images/20220721/8e6b055e7a654980bb432bba7bcbcdd7.png