將二維碼覆在一張背景圖上做宣傳圖
阿新 • • 發佈：2019-02-13
今天動手做了一個用asp.net 生成宣傳圖的功能，需準備兩張圖片，一張二維碼圖片一張背景圖，原理就是將這張二維碼圖片覆蓋在背景圖片上生成一張新圖：
不說廢話直接上程式碼吧。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="QRCode.aspx.cs" Inherits="test_QRCode" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:Button ID="Button1" runat="server" Text="生成二維碼" onclick="Button1_Click" /> </div> <div style="text-align:center"> <asp:Image ID="ImageCode" runat="server" Visible="false" /> </div> </form> </body> </html>
using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.IO; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class test_QRCode : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { //string CodeText = TextBox1.Text.Trim(); //if (!string.IsNullOrEmpty(CodeText)) //{ // ImageCode.Visible = true; // ImageCode.ImageUrl = "GetQRCode.ashx?CodeText=" + CodeText; //} string str_img_bg = Server.MapPath("1.jpg");//背景圖片 string str_img_import = Server.MapPath("2.jpg");//匯入圖片 string str_text = "張三";//匯入文字 string str_save_filename = HttpContext.Current.Server.MapPath("test/") + "\\";//處理完成之後儲存的檔案路徑 if (!Directory.Exists(str_save_filename)) Directory.CreateDirectory(str_save_filename); //載入背景圖片 using (System.Drawing.Image pickedImage = new System.Drawing.Bitmap(str_img_bg)) { using (StreamReader sr = new StreamReader(str_img_import)) { System.Drawing.Image img_import = System.Drawing.Image.FromStream(sr.BaseStream, true); if (img_import.Height != 182|| img_import.Width != 182) { img_import = KiResizeImage(img_import, 182, 182, 0); } //定位 Rectangle fromR = new Rectangle(0, 0, img_import.Width, img_import.Height); Rectangle toR = new Rectangle(315, 240, img_import.Width, img_import.Height);//嵌入圖片的位置 x，y座標 和 寬高。 using (System.Drawing.Graphics pickedG = System.Drawing.Graphics.FromImage(pickedImage)) { pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //匯入圖片 pickedG.DrawImage(img_import, toR, fromR, System.Drawing.GraphicsUnit.Pixel); //匯入文字 pickedG.DrawString(str_text, new Font("Microsoft YaHei", 20), new SolidBrush(Color.White), new PointF(320, 460)); //jpg檔案輸出 ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders(); ImageCodecInfo ici = null; foreach (ImageCodecInfo i in icis) { if (i.MimeType == "image/jpeg") { ici = i; } } EncoderParameters ep = new EncoderParameters(1); ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)90); pickedImage.Save(str_save_filename + "0000.jpg"); } } } } /// <summary> /// Resize圖片 /// </summary> /// <param name="bmp">原始Bitmap</param> /// <param name="newW">新的寬度</param> /// <param name="newH">新的高度</param> /// <param name="Mode">保留著，暫時未用</param> /// <returns>處理以後的圖片</returns> public static System.Drawing.Image KiResizeImage(System.Drawing.Image bmp, int newW, int newH, int Mode) { try { System.Drawing.Image b = new Bitmap(newW, newH); Graphics g = Graphics.FromImage(b); // 插值演算法的質量 g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel); g.Dispose(); return b; } catch { return null; } } }