C#自动生成漂亮的水晶效果头像的实现代码

与其他的微博系统相同，在“多可内网微博系统”的用户也可上传自己的头像，并支持头像裁剪。

但“多可内网微博系统”的头像可以更漂亮，因为系统实现了水晶效果的头像。
C#程序实现水晶效果头像的过程是：

（1）图像缩略到宽度或高度=90的头像；

（2）由用户选择合适的位置裁剪90x90的最终头像；

（3）添加水晶效果；

代码奉献：

if (r == 1 || r == 3)
{
h = imageSrc.Width;
w = imageSrc.Height;
}

if (save)
{
w = h = 90;
}

if (w > 300) w = 300;
if (h > 300) h = 300;

Color backColor = Color.DarkTurquoise;
Size size = new Size(w, h);

System.Drawing.Bitmap btnbmp = new Bitmap(w, h);
Graphics g = Graphics.FromImage(btnbmp);

//重置背景颜色,可以自定义
g.Clear(Color.White);

Color clr = backColor;

g.SmoothingMode = SmoothingMode.AntiAlias;//消除锯齿
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;

// 创建按钮图形－刷子
int btnOff = 0;//按钮边距
Rectangle rc1 = new Rectangle(btnOff, btnOff, size.Width - 1 - btnOff, size.Height - 1 - btnOff);
GraphicsPath gpath1 = GetGraphicsPath(rc1, 10);
GraphicsPath gpath1a = GetGraphicsPath(rc1, 15);
LinearGradientBrush br1 = new LinearGradientBrush(new Point(0, 0), new Point(0, rc1.Height + 6), clr, Color.White);

// 创建按钮阴影－刷子
int shadowOff = 1;//阴影边距
Rectangle rc2 = rc1;
rc2.Offset(0, shadowOff);
GraphicsPath gpath2 = GetGraphicsPath(rc2, 10);
PathGradientBrush br2 = new PathGradientBrush(gpath2);
br2.CenterColor = Color.FromArgb(0, 0, 0); // Color.Black;
br2.SurroundColors = new Color[] { Color.FromArgb(64, 64, 64, 64), Color.FromArgb(64, 128, 128, 128) }; // SystemColors.ButtonFace

// 为了更逼真，我们将渐变结束颜色设定为窗体前景色，可以根据窗口的前景颜色适当调整
// 创建按钮顶部白色渐变－刷子
Rectangle rc3 = rc1;
rc3.Inflate(-1, -1);
rc3.Height = 15;
GraphicsPath gpath3 = GetGraphicsPath(rc3, 10);
LinearGradientBrush br3 = new LinearGradientBrush(rc3, Color.FromArgb(255, Color.White), Color.FromArgb(0, Color.White), LinearGradientMode.Vertical);

//绘制图形
//绘制阴影
if (s > 0)
{
g.FillPath(br2, gpath2);
}

//绘制按钮
if (s > 0)
{
g.FillPath(br1, gpath1);
}

//if (s > 0)
//{
g.SetClip(gpath1a, CombineMode.Replace);
//}

switch (m)
{
case 1:
_currentBitmap = (Bitmap)imageSrc;
RotateFlip(RotateFlipType.RotateNoneFlipX);
imageSrc = (System.Drawing.Image)_currentBitmap;
break;
case 2:
_currentBitmap = (Bitmap)imageSrc;
RotateFlip(RotateFlipType.RotateNoneFlipY);
imageSrc = (System.Drawing.Image)_currentBitmap;
break;
default:
break;
}

switch (r)
{
case 1:
_currentBitmap = (Bitmap)imageSrc;
RotateFlip(RotateFlipType.Rotate90FlipNone);
imageSrc = (System.Drawing.Image)_currentBitmap;
break;
case 2:
_currentBitmap = (Bitmap)imageSrc;
RotateFlip(RotateFlipType.Rotate180FlipNone);
imageSrc = (System.Drawing.Image)_currentBitmap;
break;
case 3:
_currentBitmap = (Bitmap)imageSrc;
RotateFlip(RotateFlipType.Rotate270FlipNone);
imageSrc = (System.Drawing.Image)_currentBitmap;
break;
default:
break;
}

g.DrawImage(imageSrc, -x, -y);

//绘制顶部白色泡泡
if (s > 0)
{
g.FillPath(br3, gpath3);
}

imageSrc.Dispose();
g.Dispose();

MemoryStream stream = new MemoryStream();
btnbmp.Save(stream, System.Drawing.Imaging.ImageFormat.Png);

if (save)
{
try
{
//将此 原图片 以指定格式并用指定的编解码参数保存到指定文件
string sFile = HttpContext.Current.Server.MapPath("/") + new_avatar;
btnbmp.Save(sFile);
}
catch (System.Exception e)
{
throw e;
}
}

//输出图片containsPage
containsPage.Response.Expires = 0;
containsPage.Response.ExpiresAbsolute = System.DateTime.Now.AddSeconds(-1);
containsPage.Response.AddHeader("pragma", "no-cache");
containsPage.Response.AddHeader("cache-control", "private");
containsPage.Response.CacheControl = "no-cache";
containsPage.Response.Clear();
containsPage.Response.ContentType = "image/png";
containsPage.Response.BinaryWrite(stream.ToArray());

}
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