我有以下问题。我想以 c# windows 形式制作一些图形。 我想将位图读取到我的程序中，然后在该位图上写一些文本。最后我希望这张图片加载到图片框。这是我的问题。我该怎么做？
例如，它必须如何工作：
Bitmap a = new Bitmap(@"path\picture.bmp");
a.makeTransparent();
// ? a.writeText("some text", positionX, positionY);
pictuteBox1.Image = a;
可以吗？
【问题讨论】：
Bitmap bmp = new Bitmap("filename.bmp");
RectangleF rectf = new RectangleF(70, 90, 90, 50);
Graphics g = Graphics.FromImage(bmp);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.DrawString("yourText", new Font("Tahoma",8), Brushes.Black, rectf);
g.Flush();
image.Image=bmp;
【讨论】：
TextRenderingHint = TextRenderingHint.AntiAliasGridFit。每像素单比特模式为锯齿状：msdn.microsoft.com/en-us/library/a619zh6z(v=vs.110).aspx
非常老的问题，但今天刚刚为一个应用构建了这个，发现其他答案中显示的设置不会产生干净的图像（可能是在以后的 .Net 版本中添加了新选项）。
假设您希望文本位于位图的中心，您可以这样做：
// Load the original image
Bitmap bmp = new Bitmap("filename.bmp");
// Create a rectangle for the entire bitmap
RectangleF rectf = new RectangleF(0, 0, bmp.Width, bmp.Height);
// Create graphic object that will draw onto the bitmap
Graphics g = Graphics.FromImage(bmp);
// ------------------------------------------
// Ensure the best possible quality rendering
// ------------------------------------------
// The smoothing mode specifies whether lines, curves, and the edges of filled areas use smoothing (also called antialiasing).
// One exception is that path gradient brushes do not obey the smoothing mode.
// Areas filled using a PathGradientBrush are rendered the same way (aliased) regardless of the SmoothingMode property.
g.SmoothingMode = SmoothingMode.AntiAlias;
// The interpolation mode determines how intermediate values between two endpoints are calculated.
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
// Use this property to specify either higher quality, slower rendering, or lower quality, faster rendering of the contents of this Graphics object.
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
// This one is important
g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
// Create string formatting options (used for alignment)
StringFormat format = new StringFormat()
{
Alignment = StringAlignment.Center,
LineAlignment = StringAlignment.Center
};
// Draw the text onto the image
g.DrawString("yourText", new Font("Tahoma",8), Brushes.Black, rectf, format);
// Flush all graphics changes to the bitmap
g.Flush();
// Now save or use the bitmap
image.Image = bmp;
【讨论】：
GraphicsUnit.Pixel 添加到字体结构之前，我无法通过这个（或任何其他方法）获得成功的结果，我可能会错过什么？
var solidBrush = new SolidBrush (Color.White); g.FillRectangle (solidBrush, rectf); 来创建背景为白色和文本为黑色的位图。否则它完全是黑色的。
您需要使用Graphics 类才能在位图上书写。
具体来说，DrawString 方法之一。
Bitmap a = new Bitmap(@"path\picture.bmp");
using(Graphics g = Graphics.FromImage(a))
{
g.DrawString(....); // requires font, brush etc
}
pictuteBox1.Image = a;
【讨论】：
var bmp = new Bitmap(@"path\picture.bmp");
using( Graphics g = Graphics.FromImage( bmp ) )
{
g.DrawString( ... );
}
picturebox1.Image = bmp;
【讨论】：
如果你想wrap你的文字，那么你应该把你的文字画成一个矩形：
RectangleF rectF1 = new RectangleF(30, 10, 100, 122);
e.Graphics.DrawString(text1, font1, Brushes.Blue, rectF1);
见：https://msdn.microsoft.com/en-us/library/baw6k39s(v=vs.110).aspx
【讨论】：