1.绘制简单图形
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace 01
static class Program
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}
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 01
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
//一根笔 颜色 一张纸 两点 绘制直线的对象
}
private void button1_Click(object sender, EventArgs e)
{
//创建GDI对象
Graphics g = this.CreateGraphics();// new Graphics();
//创建画笔对象
Pen pen = new Pen(Brushes.Red);
//创建两个点
Point p1 = new Point(30, 50);
Point p2 = new Point(250, 250);
g.DrawLine(pen, p1, p2);
}
int i = 0;
private void Form1_Paint(object sender, PaintEventArgs e)
{
i++;
label1.Text = i.ToString();
Graphics g = this.CreateGraphics();// new Graphics();
//创建画笔对象
Pen pen = new Pen(Brushes.Red);
//创建两个点
Point p1 = new Point(30, 50);
Point p2 = new Point(250, 250);
g.DrawLine(pen, p1, p2);
}
private void button2_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
Pen pen=new Pen(Brushes.Yellow);
Size size=new System.Drawing.Size(80,80);
Rectangle rec=new Rectangle(new Point(50,50),size);
g.DrawRectangle(pen,rec);
}
private void button3_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
Pen pen=new Pen(Brushes.Blue);
Size size=new System.Drawing.Size(180,180);
Rectangle rec=new Rectangle(new Point(150,150),size);
g.DrawPie(pen, rec, 60, 60);
}
private void button4_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
g.DrawString("小明是最帅的", new Font("宋体", 20, FontStyle.Underline), Brushes.Black, new Point(300, 300));
}
}
}
namespace 01
{
partial class Form1
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.label1 = new System.Windows.Forms.Label();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.button4 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(367, 12);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(145, 23);
this.button1.TabIndex = 0;
this.button1.Text = "绘制一条直线";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(418, 118);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(41, 12);
this.label1.TabIndex = 1;
this.label1.Text = "label1";
//
// button2
//
this.button2.Location = new System.Drawing.Point(367, 170);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(145, 23);
this.button2.TabIndex = 2;
this.button2.Text = "绘制一个矩形";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// button3
//
this.button3.Location = new System.Drawing.Point(367, 240);
this.button3.Name = "button3";
this.button3.Size = new System.Drawing.Size(145, 23);
this.button3.TabIndex = 3;
this.button3.Text = "绘制一个扇形";
this.button3.UseVisualStyleBackColor = true;
this.button3.Click += new System.EventHandler(this.button3_Click);
//
// button4
//
this.button4.Location = new System.Drawing.Point(367, 139);
this.button4.Name = "button4";
this.button4.Size = new System.Drawing.Size(145, 23);
this.button4.TabIndex = 4;
this.button4.Text = "绘制一个文本";
this.button4.UseVisualStyleBackColor = true;
this.button4.Click += new System.EventHandler(this.button4_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(564, 417);
this.Controls.Add(this.button4);
this.Controls.Add(this.button3);
this.Controls.Add(this.button2);
this.Controls.Add(this.label1);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button3;
private System.Windows.Forms.Button button4;
}
}
2.使用GDI绘制验证码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace 02
{
static class Program
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}
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 02
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
/// <summary>
/// 点击更换验证码
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void pictureBox1_Click(object sender, EventArgs e)
{
Random r = new Random();
string str = null;
for (int i = 0; i < 5; i++)
{
int rNumber = r.Next(0, 10);
str += rNumber;
}
// MessageBox.Show(str);
//创建GDI对象
Bitmap bmp = new Bitmap(150, 40);
Graphics g = Graphics.FromImage(bmp);
for (int i = 0; i < 5; i++)
{
Point p = new Point(i * 20, 0);
string[] fonts = { "微软雅黑", "宋体", "黑体", "隶书", "仿宋" };
Color[] colors = { Color.Yellow, Color.Blue, Color.Black, Color.Red, Color.Green };
g.DrawString(str[i].ToString(), new Font(fonts[r.Next(0, 5)], 20, FontStyle.Bold), new SolidBrush(colors[r.Next(0, 5)]), p);
}
for (int i = 0; i < 20; i++)
{
Point p1=new Point(r.Next(0,bmp.Width),r.Next(0,bmp.Height));
Point p2=new Point(r.Next(0,bmp.Width),r.Next(0,bmp.Height));
g.DrawLine(new Pen(Brushes.Green), p1, p2);
}
for (int i = 0; i < 500; i++)
{
Point p=new Point(r.Next(0,bmp.Width),r.Next(0,bmp.Height));
bmp.SetPixel(p.X, p.Y, Color.Black);
}
//将图片镶嵌到PictureBox中
pictureBox1.Image = bmp;
}
}
}
namespace 02
{
partial class Form1
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.pictureBox1 = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
this.SuspendLayout();
//
// pictureBox1
//
this.pictureBox1.Location = new System.Drawing.Point(140, 41);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(439, 314);
this.pictureBox1.TabIndex = 0;
this.pictureBox1.TabStop = false;
this.pictureBox1.Click += new System.EventHandler(this.pictureBox1_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(716, 448);
this.Controls.Add(this.pictureBox1);
this.Name = "Form1";
this.Text = "Form1";
((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.PictureBox pictureBox1;
}
}
