/// <summary>
/// 绘制图片
/// </summary>
/// <param name="imgUrl"></param>
/// <param name="dataStyle"></param>
/// <param name="dataText"></param>
/// <param name="dataCmd">命令参数（后期多样式时用）</param>
/// <param name="sNo">屏幕编号</param>
/// <param name="bgColor">可变参数，无值时全部默认为透明，一个参数时文字画布的颜色，两个参数时第二个参数为主画布的颜色</param>
/// <returns></returns>
public static string GenerateImage(string imgUrl, int dataStyle, string dataText, string dataCmd, string sNo,
params string[] bgColor) {
Image imageFrom = null;
var fromPath = imgUrl;
// const string savePath = "Images/";//保存图片的路径
try {
if (!string.IsNullOrEmpty(fromPath)) {
#region 获取网络图片
var myUri = new Uri(fromPath);
var webRequest = WebRequest.Create(myUri);
var webResponse = webRequest.GetResponse();
var reStream = webResponse.GetResponseStream();
if (reStream != null) imageFrom = new Bitmap(reStream); //读取原图
#endregion
}
}
catch (Exception exp) {
// new Common.Log().WriteLog(exp.Message + "PicEditAndPreview.aspx.cs->GenerateImage()->Line64->读取图片时异常");
}
if (imageFrom == null) {
return null;
}
var ratio = (float) imageFrom.Width/imageFrom.Height; //原始图片的长宽比例
const int imageWidth = 1280; //背景画布宽高(720P)
const int imageHeight = 720; //背景画布宽高(720P)
var ratioStyle = 1F; //图片区域的宽高比例
var size = new Size();
var screenType = (ScreenStyle) dataStyle;
switch (screenType) {
case ScreenStyle.UpAndDown: {
#region 图片上文字下的风格(图片：1230*420，上半部分：720*0.618=445px 下半部分：275px)
ratioStyle = 2.9286F;
if (ratio > ratioStyle) //宽度较宽时
{
size = new Size(1230, (int) (1230/ratio));
}
else {
size = new Size((int) (420*ratio), 420);
}
#endregion
}
break;
case ScreenStyle.LeftAndRight: {
#region 图片左文字右的风格(图片：765*670 左边：790，右边490)
ratioStyle = 1.1418F;
if (ratio > ratioStyle) //宽度较宽时
{
size = new Size(765, (int) (765/ratio));
}
else {
size = new Size((int) (670*ratio), 670);
}
#endregion
}
break;
case ScreenStyle.FullScreen:
#region 图片全屏的风格(1280*720)
ratioStyle = 1.7778F;
if (ratio > ratioStyle) //宽度较宽时
{
size = new Size(1280, (int) (1280/ratio));
}
else {
size = new Size((int) (720*ratio), 720);
}
#endregion
break;
default:
break;
}
Image bmap = new Bitmap(imageWidth, imageHeight);
var g = Graphics.FromImage(bmap);
#region 更改画布颜色
var color = Color.Transparent; //默认为透明的
if (bgColor.Length > 0) {
color = ColorTranslator.FromHtml(bgColor[0]); //获取十六进制的颜色
}
if (bgColor.Length > 1) {
g.Clear(ColorTranslator.FromHtml(bgColor[1])); //给画布上色
}
else {
g.Clear(Color.Transparent);
}
#endregion
Image imageResize = new Bitmap(imageFrom, size); //重新修改图片的尺寸
switch (screenType) {
case ScreenStyle.UpAndDown: {
g.DrawImage(imageResize, (imageWidth - size.Width)/2, 445 - size.Height + 40); //把图片往画布中画
}
break;
case ScreenStyle.LeftAndRight: {
g.DrawImage(imageResize, 790 - size.Width, (imageHeight - size.Height)/2);
}
break;
case ScreenStyle.FullScreen: {
g.DrawImage(imageResize, (imageWidth - size.Width)/2, (imageHeight - size.Height)/2);
}
break;
default:
break;
}
#region 绘制文本
MyFont myFont;
Image textBitmap;
switch (screenType) {
case ScreenStyle.UpAndDown: {
myFont = new MyFont(dataText, new Bitmap(1230, 250), color, screenType);
textBitmap = myFont.GenerateText();
g.DrawImage(textBitmap, 25, 445); //往画布中贴图片
}
break;
case ScreenStyle.LeftAndRight: {
myFont = new MyFont(dataText, new Bitmap(475, 670), color, screenType);
textBitmap = myFont.GenerateText();
g.DrawImage(textBitmap, 790, 25);
}
break;
case ScreenStyle.FullScreen: {
myFont = new MyFont(dataText, new Bitmap(400, 250), color, screenType);
textBitmap = myFont.GenerateText();
g.DrawImage(textBitmap, (imageWidth + size.Width)/2 - 425,
(imageHeight + size.Height)/2 - 275); //在图片的右下角方位
}
break;
default:
break;
}
#endregion
var sPicName = DateTime.Now.ToString("yyyyMMddhhmmss");
var savePath = HttpContext.Current.Server.MapPath(string.Format(saveEditPath, sNo));
if (!Directory.Exists(savePath)) {
Directory.CreateDirectory(savePath);
}
var sPicPath =
HttpContext.Current.Server.MapPath(string.Format(saveEditPath, sNo) + sPicName + "_thumbnail.jpg");
var sPreFix = HttpContext.Current.Server.MapPath(string.Format(saveEditPath, sNo) + sPicName);
#region 创建缩略图
var smBmap = bmap.GetThumbnailImage(Convert.ToInt32(bmap.Width/4.267),
Convert.ToInt32(bmap.Height/4.267),
null, IntPtr.Zero);
smBmap.Save(sPicPath, ImageFormat.Jpeg);
#endregion
bmap.Save(sPreFix + ".jpg", ImageFormat.Jpeg);
var returnImg = string.Format(relative_edit_path, sNo) + sPicName + "_thumbnail.jpg";
return returnImg;
}
