C＃在位图上写文本

我有以下问题。我想在C＃Windows窗体中制作一些图形。我想读取位图到我的程序，然后在该位图上写一些文本。最后，我希望将此图片加载到pictureBox。这是我的问题。我该怎么做？

例如，它如何工作：

Bitmap a = new Bitmap(@"path\picture.bmp");
a.makeTransparent();
// ? a.writeText("some text", positionX, positionY);
pictuteBox1.Image = a;

有可能吗？

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;

这是一个非常老的问题，但是今天只需要为一个应用程序构建它，并发现其他答案中显示的设置不会产生清晰的图像（可能是因为在更高的.Net版本中添加了新选项）。

假设您希望文本位于位图的中心，可以执行以下操作：

// 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;

参考文献

• https://msdn.microsoft.com/zh-CN/library/system.drawing.graphics.smoothingmode(v=vs.110).aspx
• https://msdn.microsoft.com/zh-CN/library/system.drawing.drawing2d.interpolationmode(v=vs.110).aspx
• https://msdn.microsoft.com/zh-CN/library/system.drawing.graphics.pixeloffsetmode(v=vs.110).aspx
• https://msdn.microsoft.com/zh-cn/library/system.drawing.graphics.textrenderinghint(v=vs.110).aspx
• https://msdn.microsoft.com/zh-CN/library/system.drawing.stringformat(v=vs.110).aspx
• https://msdn.microsoft.com/zh-CN/library/21kdfbzs(v=vs.110).aspx

您需要使用Graphics该类才能在位图上进行编写。

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;

var bmp = new Bitmap(@"path\picture.bmp");
using( Graphics g = Graphics.FromImage( bmp ) )
{
    g.DrawString( ... );
}

picturebox1.Image = bmp;

如果你想换你的文字，那么你应该画在你的文字矩形：

RectangleF rectF1 = new RectangleF(30, 10, 100, 122);
e.Graphics.DrawString(text1, font1, Brushes.Blue, rectF1);

请参阅：https : //msdn.microsoft.com/zh-cn/library/baw6k39s(v=vs.110).aspx