public mChartlet.Chartlet GenerateChartlet(string serverID, string msg, string signName)
{
try
{
if (string.IsNullOrEmpty(serverID))
{
return(null);
}
using (EFContext context = new EFContext())
{
var charlet = new mChartlet.Chartlet
{
ServerIDWX = serverID,
MsgText = msg,
SignName = signName,
};
// 从微信服务器下载图片
var oriImgPath = WXUtil.DownloadFile(serverID, ".jpg");
if (oriImgPath == null)
{
return(null);
}
charlet.OriginalImgPath = oriImgPath;
// 生成图片
var suc = DrawChartlet(charlet);
if (!suc)
{
return(null);
}
charlet.CreateDate = DateTime.Now;
context.Chartlets.Add(charlet);
context.SaveChanges();
return(charlet);
}
}
catch (Exception ex)
{
LogHelper.Error(ex);
return(null);
}
}
private bool DrawChartlet(mChartlet.Chartlet chartlet)
{
try
{
string srcImgPath = HttpContext.Current.Server.MapPath(chartlet.OriginalImgPath);
Bitmap srcBitmap = new Bitmap(srcImgPath);
var fonts = new System.Drawing.Text.PrivateFontCollection();
fonts.AddFontFile(HttpContext.Current.Server.MapPath("/fonts/新蒂黑板报.ttf"));
Font f = new Font(fonts.Families[0], 11);
Brush b = Brushes.Black;
int paddingInner = 15;
int spaceImg = 20;
int spaceMsg = 5;
int spaceName = 50;
int spaceNameRight = 15;
int spaceBottom = 0;
// 目标图的宽=原图的宽
// 目标图的高 = 原图的高+间隙+所有文字的高+间隙+签名的高
int dstWith = srcBitmap.Width < 320 ? 320 : srcBitmap.Width;
dstWith = dstWith > 420 ? 420 : dstWith;
float rate = (float)dstWith / srcBitmap.Width;
int rateHeight = Convert.ToInt32(rate * srcBitmap.Height);
int dstHeight = rateHeight;
List <string> msgList = new List <string>();
List <string> oriMsgList = chartlet.MsgText.Split(new string[] { "\n" }, StringSplitOptions.RemoveEmptyEntries).ToList();
foreach (var item in oriMsgList)
{
msgList.AddRange(StrUtil.SplitStringByWidth(item, dstWith, f));
}
int normalTextHeight = StrUtil.MeasureString(oriMsgList[0], f).Height;
dstHeight = rateHeight + spaceImg + msgList.Count * normalTextHeight +
(msgList.Count - 1) * spaceMsg + spaceName + normalTextHeight + spaceBottom;
// 开始绘图
Bitmap dstBitmap = new Bitmap(dstWith + paddingInner * 2, dstHeight + paddingInner * 2);
using (Graphics g = Graphics.FromImage(dstBitmap))
{
int x = paddingInner;
int y = paddingInner;
g.FillRectangle(Brushes.White, 0, 0, dstBitmap.Width, dstBitmap.Height);
Rectangle r = new Rectangle(new Point(x, y), new Size(dstWith, rateHeight));
g.DrawImage(srcBitmap, r);
y = y + rateHeight + spaceImg;
for (int i = 0; i < msgList.Count; i++)
{
Size currentSize = StrUtil.MeasureString(msgList[i], f);
g.DrawString(msgList[i], f, b, new PointF((dstWith - currentSize.Width) / 2 + x, y));
y += (currentSize.Height + ((i == (msgList.Count - 1)) ? spaceName : spaceMsg));
}
var nameSize = StrUtil.MeasureString(chartlet.SignName, f);
g.DrawString(chartlet.SignName, f, b, new PointF(dstWith - nameSize.Width - spaceNameRight + paddingInner, y));
}
// 为图片加相框
//int paddingOutterTop = 60;
//int paddingOutterLeft = 60;
//int paddingOutterRight = 20;
//int paddingOutterBottom = 20;
//Bitmap frameBitmap = new Bitmap(dstBitmap.Width+paddingOutterLeft+paddingOutterRight,dstBitmap.Height+paddingOutterTop+paddingOutterBottom);
//using (Graphics g = Graphics.FromImage(frameBitmap))
//{
// string frameBgImgPath = HttpContext.Current.Server.MapPath("/img/bg-chartlet.jpg");
// Bitmap frameBgImg = new Bitmap(frameBgImgPath);
// g.DrawImage(frameBgImg, 0, 0);
// Rectangle r = new Rectangle(new Point(paddingOutterLeft, paddingOutterTop), new Size(dstBitmap.Width, dstBitmap.Height));
// g.DrawImage(dstBitmap, r);
// frameBgImg.Dispose();
//}
string dstVirtualPath = "/Data/Chartlets/" + chartlet.ServerIDWX + ".jpg";
string dstPath = HttpContext.Current.Server.MapPath(dstVirtualPath);
dstBitmap.Save(dstPath);
chartlet.BuildImgPath = dstVirtualPath;
srcBitmap.Dispose();
dstBitmap.Dispose();
//frameBitmap.Dispose();
return(true);
}
catch (Exception ex)
{
LogHelper.Error(ex);
return(false);
}
}