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這篇文章主要介紹“C#怎么實現在底圖上動態生成文字和圖片”,在日常操作中,相信很多人在C#怎么實現在底圖上動態生成文字和圖片問題上存在疑惑,小編查閱了各式資料,整理出簡單好用的操作方法,希望對大家解答”C#怎么實現在底圖上動態生成文字和圖片”的疑惑有所幫助!接下來,請跟著小編一起來學習吧!
本文主要記錄在圖片上動態的生成需要添加的文字和把指定的圖片加到底圖上,直接上代碼
/// <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">畫區總長度</param>/// <param name="totalHeight">畫區總高度</param>/// <param name="px">起點X坐標</param>/// <param name="py">起點Y坐標</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">畫區總長度</param> /// <param name="totalHeight">畫區總高度</param> /// <param name="px">起點X坐標</param> /// <param name="py">起點Y坐標</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) /// </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</param> /// <param name="pointY">文字y坐標</param> /// <param name="word">文字內容</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); }
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