c#PictureBox画直线 矩形

转自：http://blog.csdn.net/hejialin666/article/details/3584285

c#PictureBox的基本使用（画直线,矩形）

下面的四个事件一定要绑定，不绑定任何效果都没有的 

private Point m_ptStart = new Point(0, 0);
private Point m_ptEnd = new Point(0, 0);
// true: MouseUp or false: MouseMove 
private bool m_bMouseDown = false;private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{if (e.Button != MouseButtons.Left){return;}  if (!m_bMouseDown){m_ptStart = new Point(e.X, e.Y);m_ptEnd = new Point(e.X, e.Y);}m_bMouseDown = !m_bMouseDown;
}private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{if (e.Button != MouseButtons.Left){return;}if (m_ptStart.X >= 0 && m_ptEnd.X >= 0&& m_ptStart.Y >= 0 && m_ptEnd.Y >= 0&& m_ptStart.X <= 254 && m_ptEnd.X <= 254&& m_ptStart.Y <= 163 && m_ptEnd.Y <= 163){m_ptEnd = new Point(e.X, e.Y);m_bMouseDown = !m_bMouseDown;this.pictureBox1.Refresh();}else{m_ptEnd = m_ptStart;m_bMouseDown = !m_bMouseDown;this.pictureBox1.Refresh();}
}private void pictureBox1_Paint(object sender, PaintEventArgs e)
{if (m_ptStart.Equals(m_ptEnd)) return;e.Graphics.DrawLine(System.Drawing.Pens.Red, m_ptStart, m_ptEnd);//画矩形加上以下六行//if (m_ptEnd.X - m_ptStart.X < 0 || m_ptEnd.Y - m_ptStart.Y < 0)
// {
//     return;
//}//e.Graphics.DrawRectangle(System.Drawing.Pens.Blue, m_ptStart.X, m_ptStart.Y, m_ptEnd.X - m_ptStart.X, m_ptEnd.Y - m_ptStart.Y);
}private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{if (e.Button != MouseButtons.Left){return;}m_ptEnd = new Point(e.X, e.Y);this.pictureBox1.Refresh();
}

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