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我正在尝试创建验证码图像。我正在生成一个随机字符串并以随机角度旋转文本并尝试创建一个字节数组。下面是我的代码片段:

Image img = Image.FromFile(@"C:\Images\BackGround.jpg");
RectangleF myRect = new RectangleF(0, 0, width, height);
objGraphics.DrawImage(img, myRect);


Matrix myMatrix = new Matrix();
int i = 0;

StringFormat formatter = new StringFormat();
formatter.Alignment = StringAlignment.Center;

for (i = 0; i <= myString.Length - 1; i++)
{
    myMatrix.Reset();
    int charLenght = myString.Length;
    float x = width / (charLenght + 1) * i;
    float y = height / 30F;

    myMatrix.RotateAt(oRandom.Next(-40, 40), new PointF(x, y));
    objGraphics.Transform = myMatrix;

    objGraphics.DrawString(myString.Substring(i, 1), MyFont, MyFontEmSizes,       MyFontStyles,
                           MySolidBrush, x, Math.Max(width, height) / 50, formatter );

    objGraphics.ResetTransform();
}

一切都很好,除了网页上我的最终图像中的第一个字符越过了矩形的左边框。如何将文本与矩形的中心对齐?

谢谢。

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