Graphics.DrawImage 的问题

[birdcwd]

用的是 Graphics.DrawImage(newImage, destRect, srcRect, units)

代码是：
Dim newImage As Image = PictureBox1.Image
Dim destRect As New Rectangle(0, 0, 1120, 1120)
Dim srcRect As New Rectangle(1520,240,2640,1360)
Dim units As GraphicsUnit = GraphicsUnit.Pixel

gr.DrawImage(newImage, destRect, srcRect, units)
PictureBox2.Image = resultBitmap

为什么截到的图变形了呢？看起来是横向上多了一部分

[gxingmin]

PictureBox2的size是1120*1120？ 如果不是就是picturebox2把这个图像拉伸了