winform 如何使picturebox 旋转

RT，就是说 使它水平旋转90。

//可以实现任意角度的旋转，旋转出现的角落空白可以选择填充的颜色。
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Text;
using System.Windows.Forms;

namespace bitmaprerote
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public static Bitmap KiRotate(Bitmap bmp, float angle, Color bkColor)
{
int w = bmp.Width + 2;
int h = bmp.Height + 2;

PixelFormat pf;

if (bkColor == Color.Transparent)
{
pf = PixelFormat.Format32bppArgb;
}
else
{
pf = bmp.PixelFormat;
}

Bitmap tmp = new Bitmap(w, h, pf);
Graphics g = Graphics.FromImage(tmp);
g.Clear(bkColor);
g.DrawImageUnscaled(bmp, 1, 1);
g.Dispose();

GraphicsPath path = new GraphicsPath();
path.AddRectangle(new RectangleF(0f, 0f, w, h));
Matrix mtrx = new Matrix();
mtrx.Rotate(angle);
RectangleF rct = path.GetBounds(mtrx);

Bitmap dst = new Bitmap((int)rct.Width, (int)rct.Height, pf);
g = Graphics.FromImage(dst);
g.Clear(bkColor);
g.TranslateTransform(-rct.X, -rct.Y);
g.RotateTransform(angle);
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
g.DrawImageUnscaled(tmp, 0, 0);
g.Dispose();
tmp.Dispose();
return dst;
}
private void button2_Click(object sender, EventArgs e)
{
Bitmap map = new Bitmap("F:\\hj.jpg");
this.pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
map = KiRotate(map, 30, Color.Pink);
pictureBox1.Image = map;
}
}
}

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