使用Graphics、pen、brush、color、Font类和对应的方法属性

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public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
g.DrawLine(Pens.Red, 0, 0, 100, 100);
}

private void button1_Click(object sender, EventArgs e)
{
//Graphics g = this.CreateGraphics();
//g.DrawLine(Pens.Red, 0, 0, 100, 100);
Graphics g = this.pictureBox1.CreateGraphics();
g.DrawRectangle(Pens.Blue, 10, 10, 60, 100);
}

private void Form1_Paint(object sender, PaintEventArgs e)
{
//Graphics g = this.CreateGraphics();
//g.DrawLine(Pens.Red, 0, 0, 100, 100);
Graphics g = this.pictureBox1.CreateGraphics();
e.Graphics.DrawRectangle(Pens.Blue, 10, 10, 60, 100);
}

private void button2_Click(object sender, EventArgs e)
{
if (this.openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
Image img = Image.FromFile(this.openFileDialog1.FileName);
Graphics g = Graphics.FromImage(img);
Pen pen = new Pen(Color.Black, 10);
Color c1 = Color.FromArgb(255, 0, 250);
Color c2 = Color.FromArgb(150, 200, 100, 210);
Pen pen2 = new Pen(c1, 20);
Pen pen3 = new Pen(c2, 30);

g.DrawLine(Pens.Red, 0, 300, 800, 300);
g.DrawLine(Pens.Red, 0, 1020, 800, 1020);

g.DrawEllipse(pen2, 0, 200, 120, 60);
g.DrawEllipse(pen3, 0, 300, 150, 100);
for (int i = 0; i < 121; i = i + 40)
{
g.DrawEllipse(Pens.Green, i, 40, 40, 40);
}
for (int n = 160; n < 361; n = n + 40)
{
g.FillEllipse(Brushes.Green, n, 40, 40, 40);
}

g.DrawPie(pen3, 230, 40, 200, 200, 90, 270);//画扇形

g.DrawArc(pen2, 30, 190, 200, 200, 90, 270);//画弧线
#region 画刷的使用
Brush b = Brushes.Gray;
g.FillEllipse(b, 400, 40, 80, 80);
SolidBrush b2 = new SolidBrush(c2);
g.FillPie(b2, 530, 40, 100, 100, 90, 270);//画扇形

Image img1 = Image.FromFile("E:\\wenli.jpg");
TextureBrush b3 = new TextureBrush(img1);
g.FillEllipse(b2, 300, 90, 180, 180);
g.FillPie(b3, 0, 0, 400, 400, 0, 45);
g.FillPie(b3, 0, 0, 400, 400, 90, 45);
g.FillPie(b3, 0, 0, 400, 400, 180, 45);
g.FillPie(b3, 0, 0, 400, 400, 270, 45);
g.FillRectangle(b3, 350, 350, 100, 100);
#endregion

//字
g.DrawString("HBSI", new Font("宋体", 40), b3, 0, 0);
//图
g.DrawImage(img1, img.Width - img1.Width - 20, img.Height - img.Height - 20);
img.Save("E:\\11.jpg");
this.pictureBox1.Image = img;
}
}
}