谁可以指导如何从输入文本生成图像。图像可能有任何扩展名都无关紧要。
发布于 2010-01-15 17:19:06
好的,假设您想要在C#中的图像上绘制一个字符串,您需要在这里使用System.Drawing命名空间:
private Image DrawText(String text, Font font, Color textColor, Color backColor)
{
//first, create a dummy bitmap just to get a graphics object
Image img = new Bitmap(1, 1);
Graphics drawing = Graphics.FromImage(img);
//measure the string to see how big the image needs to be
SizeF textSize = drawing.MeasureString(text, font);
//free up the dummy image and old graphics object
img.Dispose();
drawing.Dispose();
//create a new image of the right size
img = new Bitmap((int) textSize.Width, (int)textSize.Height);
drawing = Graphics.FromImage(img);
//paint the background
drawing.Clear(backColor);
//create a brush for the text
Brush textBrush = new SolidBrush(textColor);
drawing.DrawString(text, font, textBrush, 0, 0);
drawing.Save();
textBrush.Dispose();
drawing.Dispose();
return img;
}
这段代码将首先测量字符串,然后创建正确大小的图像。
如果您想保存此函数的返回结果,只需调用返回图像的save方法即可。
发布于 2016-06-27 11:49:46
谢谢,卡扎。对之前的答案稍有改进,用于在使用后处理图像/图形对象,并引入了最小尺寸参数
private Image DrawTextImage(String currencyCode, Font font, Color textColor, Color backColor) {
return DrawTextImage(currencyCode, font, textColor, backColor, Size.Empty);
}
private Image DrawTextImage(String currencyCode, Font font, Color textColor, Color backColor, Size minSize) {
//first, create a dummy bitmap just to get a graphics object
SizeF textSize;
using (Image img = new Bitmap(1, 1)) {
using (Graphics drawing = Graphics.FromImage(img)) {
//measure the string to see how big the image needs to be
textSize = drawing.MeasureString(currencyCode, font);
if (!minSize.IsEmpty) {
textSize.Width = textSize.Width > minSize.Width ? textSize.Width : minSize.Width;
textSize.Height = textSize.Height > minSize.Height ? textSize.Height : minSize.Height;
}
}
}
//create a new image of the right size
Image retImg = new Bitmap((int)textSize.Width, (int)textSize.Height);
using (var drawing = Graphics.FromImage(retImg)) {
//paint the background
drawing.Clear(backColor);
//create a brush for the text
using (Brush textBrush = new SolidBrush(textColor)) {
drawing.DrawString(currencyCode, font, textBrush, 0, 0);
drawing.Save();
}
}
return retImg;
}
发布于 2019-07-27 00:17:15
这是Panayiotis版本的Kazar的答案,带有可选的参数和文档,适合添加到库类中。
/// <summary>
/// Creates an image containing the given text.
/// NOTE: the image should be disposed after use.
/// </summary>
/// <param name="text">Text to draw</param>
/// <param name="fontOptional">Font to use, defaults to Control.DefaultFont</param>
/// <param name="textColorOptional">Text color, defaults to Black</param>
/// <param name="backColorOptional">Background color, defaults to white</param>
/// <param name="minSizeOptional">Minimum image size, defaults the size required to display the text</param>
/// <returns>The image containing the text, which should be disposed after use</returns>
public static Image DrawText(string text, Font fontOptional=null, Color? textColorOptional=null, Color? backColorOptional=null, Size? minSizeOptional=null)
{
Font font = Control.DefaultFont;
if (fontOptional != null)
font = fontOptional;
Color textColor = Color.Black;
if (textColorOptional != null)
textColor = (Color)textColorOptional;
Color backColor = Color.White;
if (backColorOptional != null)
backColor = (Color)backColorOptional;
Size minSize = Size.Empty;
if (minSizeOptional != null)
minSize = (Size)minSizeOptional;
//first, create a dummy bitmap just to get a graphics object
SizeF textSize;
using (Image img = new Bitmap(1, 1))
{
using (Graphics drawing = Graphics.FromImage(img))
{
//measure the string to see how big the image needs to be
textSize = drawing.MeasureString(text, font);
if (!minSize.IsEmpty)
{
textSize.Width = textSize.Width > minSize.Width ? textSize.Width : minSize.Width;
textSize.Height = textSize.Height > minSize.Height ? textSize.Height : minSize.Height;
}
}
}
//create a new image of the right size
Image retImg = new Bitmap((int)textSize.Width, (int)textSize.Height);
using (var drawing = Graphics.FromImage(retImg))
{
//paint the background
drawing.Clear(backColor);
//create a brush for the text
using (Brush textBrush = new SolidBrush(textColor))
{
drawing.DrawString(text, font, textBrush, 0, 0);
drawing.Save();
}
}
return retImg;
}
https://stackoverflow.com/questions/2070365
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