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：

/// <summary>
/// 绘制水晶效果的头像
/// </summary>
/// <param name="containspage"></param>
/// <param name="w"></param>
/// <param name="h"></param>
/// <param name="memostring"></param>
public static void avatar(page containspage, string filename, int r, int m, int s, int x, int y, bool save, string new_avatar)
{
system.drawing.image imagesrc = system.drawing.image.fromfile(httpcontext.current.server.mappath("/") + filename);
int w = imagesrc.width;
int h = imagesrc.height;

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());

}