Question

WPF如何生成一个自定义的图片啊

WPF如何生成一个自定义的图片啊 要求尺寸:3200x523 DPI: 1693 字体7.5PT 字体Style：FontWeights.thin ,字体：Arial

Answer 1

1、使用DrawingVisual绘制你的内容：
var drawingVisual = new DrawingVisual();
using(var drawingContext = drawingVisual.RenderOpen())
{
var text = new FormattedText(.....);
var position = new Point(......);
drawingVisual.DrawText(text, position);
}

2、用RenderTargetBitmap渲染成位图：
var renderTargetBitmap = new RenderTargetBitmap(.....);
renderTargetBitmap.Render(drawingVisual);

3、选用一种BitmapEncoder保存，比如PngBitmapEncoder：
var encoder = new PngBitmapEncoder();
var frame = BitmapFrame.Create(renderTargetBitmap);
encoder.Frames.Add(frame);
encoder.Save(...);

Answer 2

你要绘图还是用GDI吧，WPF工程中要引用System.Drawing
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(3200, 523, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
bmp.SetResolution(1693, 1693);
System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(bmp);
System.Drawing.Font font = new System.Drawing.Font("Arial", 7.5f); //, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
graphic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; // 这行可以不要，用于控制输出效果
graphic.DrawString("This is test text...", font, System.Drawing.Brushes.Black, new System.Drawing.PointF(50, 20)); // 测试文字输出
// 绘制一个圆
System.Drawing.Pen pen = new System.Drawing.Pen(System.Drawing.Color.Red);
pen.Width = 4;
graphic.DrawEllipse(pen, System.Drawing.Rectangle.FromLTRB(50, 200, 400, 400));
bmp.Save("C:\\Test.png", System.Drawing.Imaging.ImageFormat.Png);
font.Dispose();
graphic.Dispose();
bmp.Dispose();

追问

谢谢，我现在用的就是GDI，可是现在的工作要求必须用WPF，因为要用到FontWeights.thin，而这个在windows下面是没有的。

追答

This attribute is modeled after the lfWeight field in GDI LOGFONT. For consistency, the following values have been adopted from LOGFONT: 0=DontCare, 100=Thin, 200=ExtraLight or UltraLight, 300=Light, 400=Normal or Regular, 500=Medium, 600=SemiBold or DemiBold, 700=Bold, 800=ExtraBold or UltraBold, and 900=Heavy or Black.
你可以使用GDI的LOGFONT实现你要的，界面交给WPF，对图像的后台处理还是GDI吧，毕竟WPF的优势不在于此

追问

求具体实现方法 感谢感谢！！！