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這篇文章主要介紹了C#如何實現(xiàn)在底圖上動態(tài)生成文字和圖片,具有一定借鑒價值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
代碼:
/// <summary> /// 在底圖上畫指定路徑的圖片 /// </summary> /// <param name="g">畫板實例</param> /// <param name="path">圖片路徑</param> /// <param name="totalWidth">畫區(qū)總長度</param> /// <param name="totalHeight">畫區(qū)總高度</param> /// <param name="px">起點X坐標(biāo)</param> /// <param name="py">起點Y坐標(biāo)</param> private void FontPic(ref Graphics g, string path, int totalWidth, int totalHeight, int px, int py) { if (File.Exists(path)) { var pImg = Image.FromFile(path); //如果圖片大于畫布區(qū)域,則縮小 if (totalHeight < pImg.Height && totalWidth < pImg.Width) { Image newPic = GetReducedImage(pImg, totalWidth, totalHeight); if (newPic != null) { DrawPic(ref g, totalWidth, totalHeight, px, py, newPic); } } else if (totalHeight < pImg.Height && totalWidth >= pImg.Width) { Image newPic = GetReducedImage(pImg, pImg.Width, totalHeight); if (newPic != null) { DrawPic(ref g, totalWidth, totalHeight, px, py, newPic); } } else if (totalHeight >= pImg.Height && totalWidth < pImg.Width) { Image newPic = GetReducedImage(pImg, totalWidth, pImg.Height); if (newPic != null) { DrawPic(ref g, totalWidth, totalHeight, px, py, newPic); } } else { DrawPic(ref g, totalWidth, totalHeight, px, py, pImg); } } } /// <summary> /// 在圖上畫圖片 /// </summary> /// <param name="g">畫板實例</param> /// <param name="totalWidth">畫區(qū)總長度</param> /// <param name="totalHeight">畫區(qū)總高度</param> /// <param name="px">起點X坐標(biāo)</param> /// <param name="py">起點Y坐標(biāo)</param> /// <param name="pImg">要畫的圖片實例</param> private void DrawPic(ref Graphics g, int totalWidth, int totalHeight, int px, int py, Image pImg) { px += GetValue(totalWidth, pImg.Width); py += GetValue(totalHeight, pImg.Height); g.DrawImage(new Bitmap(pImg, new Size(GetSize(totalWidth, pImg.Width), GetSize(totalHeight, pImg.Height))), new Rectangle(px, py, totalWidth, totalHeight), 0, 0, totalWidth, totalHeight, GraphicsUnit.Pixel); } /// <summary> /// 生成縮略圖重載方法1,返回縮略圖的Image對象 /// </summary> /// <param name="width">縮略圖的寬度</param> /// <param name="height">縮略圖的高度</param> /// <returns>縮略圖的Image對象</returns> public Image GetReducedImage(Image resourceImage, int width, int height) { try { Image data = null; //用指定的大小和格式初始化Bitmap類的新實例 using (Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb)) { //從指定的Image對象創(chuàng)建新Graphics對象 using (Graphics graphics = Graphics.FromImage(bitmap)) { //清除整個繪圖面并以透明背景色填充 //graphics.Clear(Color.Transparent); //在指定位置并且按指定大小繪制原圖片對象 graphics.DrawImage(resourceImage, new Rectangle(0, 0, width, height)); } data = new Bitmap(bitmap); } return data; } catch (Exception e) { throw e; } } /// <summary> /// 比較兩個值,得到給到給定值(判斷是否越界) /// </summary> /// <param name="total">總長度</param> /// <param name="width">指定長度</param> /// <returns></returns> public int GetSize(int total, int width) { if (total > width) { return width; } else { return total; } } /// <summary> /// 更加傳入的值計算得到新值(計算點坐標(biāo)) /// </summary> /// <param name="total">總長度</param> /// <param name="width">指定長度</param> /// <returns></returns> private int GetValue(int total, int width) { return (total - width) / 2; } /// <summary> /// 在圖片上畫出文字 /// </summary> /// <param name="g">圖片對象</param> /// <param name="pointX">文字x坐標(biāo)</param> /// <param name="pointY">文字y坐標(biāo)</param> /// <param name="word">文字內(nèi)容</param> /// <param name="textWidth">文本寬度</param> /// <param name="textHeight">文本高度</param> private static void DrawStringWord(Graphics g, int pointX, int pointY, string word, int textWidth, int textHeight, int fontSize = 30) { Font font = new Font("微軟雅黑", fontSize, (FontStyle.Regular)); RectangleF textArea = new RectangleF(pointX, pointY, textWidth, textHeight); Brush brush = new SolidBrush(Color.Black); g.DrawString(word, font, brush, textArea); }
C#是一個簡單、通用、面向?qū)ο蟮木幊陶Z言,它由微軟Microsoft開發(fā),繼承了C和C++強大功能,并且去掉了一些它們的復(fù)雜特性,C#綜合了VB簡單的可視化操作和C++的高運行效率,以其強大的操作能力、優(yōu)雅的語法風(fēng)格、創(chuàng)新的語言特性和便捷的面向組件編程從而成為.NET開發(fā)的首選語言,但它不適用于編寫時間急迫或性能非常高的代碼,因為C#缺乏性能極高的應(yīng)用程序所需要的關(guān)鍵功能。
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