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这篇文章主要介绍了C#如何实现在底图上动态生成文字和图片,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
代码:
/// <summary> /// 在底图上画指定路径的图片 /// </summary> /// <param name="g">画板实例</param> /// <param name="path">图片路径</param> /// <param name="totalWidth">画区总长度</param> /// <param name="totalHeight">画区总高度</param> /// <param name="px">起点X坐标</param> /// <param name="py">起点Y坐标</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); //如果图片大于画布区域,则缩小 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> /// 在图上画图片 /// </summary> /// <param name="g">画板实例</param> /// <param name="totalWidth">画区总长度</param> /// <param name="totalHeight">画区总高度</param> /// <param name="px">起点X坐标</param> /// <param name="py">起点Y坐标</param> /// <param name="pImg">要画的图片实例</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> /// 生成缩略图重载方法1,返回缩略图的Image对象 /// </summary> /// <param name="width">缩略图的宽度</param> /// <param name="height">缩略图的高度</param> /// <returns>缩略图的Image对象</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类的新实例 using (Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb)) { //从指定的Image对象创建新Graphics对象 using (Graphics graphics = Graphics.FromImage(bitmap)) { //清除整个绘图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绘制原图片对象 graphics.DrawImage(resourceImage, new Rectangle(0, 0, width, height)); } data = new Bitmap(bitmap); } return data; } catch (Exception e) { throw e; } } /// <summary> /// 比较两个值,得到给到给定值(判断是否越界) /// </summary> /// <param name="total">总长度</param> /// <param name="width">指定长度</param> /// <returns></returns> public int GetSize(int total, int width) { if (total > width) { return width; } else { return total; } } /// <summary> /// 更加传入的值计算得到新值(计算点坐标) /// </summary> /// <param name="total">总长度</param> /// <param name="width">指定长度</param> /// <returns></returns> private int GetValue(int total, int width) { return (total - width) / 2; } /// <summary> /// 在图片上画出文字 /// </summary> /// <param name="g">图片对象</param> /// <param name="pointX">文字x坐标</param> /// <param name="pointY">文字y坐标</param> /// <param name="word">文字内容</param> /// <param name="textWidth">文本宽度</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("微软雅黑", fontSize, (FontStyle.Regular)); RectangleF textArea = new RectangleF(pointX, pointY, textWidth, textHeight); Brush brush = new SolidBrush(Color.Black); g.DrawString(word, font, brush, textArea); }
C#是一个简单、通用、面向对象的编程语言,它由微软Microsoft开发,继承了C和C++强大功能,并且去掉了一些它们的复杂特性,C#综合了VB简单的可视化操作和C++的高运行效率,以其强大的操作能力、优雅的语法风格、创新的语言特性和便捷的面向组件编程从而成为.NET开发的首选语言,但它不适用于编写时间急迫或性能非常高的代码,因为C#缺乏性能极高的应用程序所需要的关键功能。
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