简单的C#图片处理软件

public partial class Form2 : Form { public Form2() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Pen p = new Pen(Color.Black, 3); Graphics g = this.CreateGraphics(); g.DrawEllipse(p, 100, 300); } private void button2_Click(object sender, EventArgs e) { SolidBrush b = new SolidBrush(Color.Red); Graphics g = this.CreateGraphics(); g.FillEllipse(b,20,150); } private void button3_Click(object sender, EventArgs e) { TextureBrush b = new TextureBrush(new Bitmap(@"E:壁纸叶子.jpg")); Graphics g = this.CreateGraphics(); g.FillEllipse(b, 50, 150); } private void button4_Click(object sender, EventArgs e) { TextureBrush b = new TextureBrush(new Bitmap(@"E:壁纸叶子.jpg")); Pen p = new Pen(b, 5); Graphics g = this.CreateGraphics(); g.DrawRectangle(p,150,50); } bool zt = false; bool bi= false; Pen p1; Point z1, z2; private void button5_Click(object sender, EventArgs e) { p1 = new Pen(Color.Black, 5); if (bi) { bi = false; } else { bi = t