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How to save geometry as an image?

How to save Geometry as an image?

For example, I have a List<Geometry> .

I want it to be as follows:

 for (int i = 0; i < GeometryList.Count; i++) { Pen TestPen = new Pen(Brushes.Black, 1); GeometryDrawing TestDrawing = new GeometryDrawing(Brushes.Black, TestPen, TestGeometry); Bitmap b = TestDrawing as Bitmap; b.Save(System.AppDomain.CurrentDomain.BaseDirectory + i + ".png", ImageFormat.Png); }

Update:

The code I wrote a few hours ago:

  private void CreateFontMap(string PathTofont) { GlyphTypeface font = new GlyphTypeface(new Uri(PathTofont)); List<ushort> fontNum = new List<ushort>(); foreach (KeyValuePair<int, ushort> kvp in font.CharacterToGlyphMap) { fontNum.Add(kvp.Value); } if (fontNum.Count > 0) { int mapWidth = 50 * 20; int mapHeight = 50 * (getRowNum(fontNum.Count + 1) + 1); Bitmap b = new Bitmap(mapWidth, mapHeight); Graphics g = Graphics.FromImage(b); System.Windows.Media.Pen glyphPen = new System.Windows.Media.Pen(System.Windows.Media.Brushes.Red, 1); Geometry glyphGeometry; for (int i = 0; i < fontNum.Count; i++) { glyphGeometry = font.GetGlyphOutline(fontNum[i], 50, 1); RenderTargetBitmap bmp = new RenderTargetBitmap(50, 50, 96, 96, PixelFormats.Pbgra32); DrawingVisual viz = new DrawingVisual(); DrawingContext dc = viz.RenderOpen(); dc.DrawGeometry(System.Windows.Media.Brushes.Red, null, glyphGeometry); dc.Close(); bmp.Render(viz); PngBitmapEncoder encoder = new PngBitmapEncoder(); encoder.Frames.Add(BitmapFrame.Create(bmp)); MemoryStream myStream = new MemoryStream(); encoder.Save(myStream); int rowNum = (getRowNum(i)); g.DrawImage(System.Drawing.Bitmap.FromStream(myStream), new PointF((i - rowNum * 20) * 50, rowNum * 50)); } g.Dispose(); b.Save(System.AppDomain.CurrentDomain.BaseDirectory + "map.png", ImageFormat.Png); b.Dispose(); } } private int getRowNum(int p) { return p / 20; }

But instead Img1 I get Img2 .

Update 2: I changed this:

 DrawingVisual viz = new DrawingVisual(); DrawingContext dc = viz.RenderOpen(); dc.DrawGeometry(System.Windows.Media.Brushes.Red, null, glyphGeometry); dc.Close();

in

 DrawingVisual viz = new DrawingVisual(); DrawingContext dc = viz.RenderOpen(); dc.DrawImage(geometryImage, new Rect(0, 0, 50, 50)); dc.Close();

and added:

 glyphDrawing = new GeometryDrawing(System.Windows.Media.Brushes.Black, glyphPen, glyphGeometry); DrawingImage geometryImage = new DrawingImage(glyphDrawing); geometryImage.Freeze(); img1.Source = geometryImage;

And everything works.

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4 answers
 // Create the bitmap we'll render to RenderTargetBitmap bmp = new RenderTargetBitmap(100, 100, // Size 96, 96, // DPI PixelFormats.Pbgra32); // Create a list of random circle geometries List<Geometry> geoList = new List<Geometry>(); Random rand = new Random(); for (int i=0; i<10; i++) { double radius = rand.Next(5, 10); Point center = new Point(rand.Next(25, 75), rand.Next(25,75)); geoList.Add(new EllipseGeometry(center, radius, radius)); } // The light-weight visual element that will draw the geometries DrawingVisual viz = new DrawingVisual(); using (DrawingContext dc = viz.RenderOpen()) { // The DC lets us draw to the DrawingVisual directly foreach (var g in geoList) dc.DrawGeometry(Brushes.Red, null, g); } // the DC is closed as it falls out of the using statement // draw the visual on the bitmap bmp.Render(viz); // instantiate an encoder to save the file PngBitmapEncoder pngEncoder = new PngBitmapEncoder(); // add this bitmap to the encoders set of frames pngEncoder.Frames.Add(BitmapFrame.Create(bmp)); // save the bitmap as an .png file using (FileStream file = new FileStream("Spots.png", FileMode.Create)) pngEncoder.Save(file);

Based on your comments on the above section, it looks like you are trying to create a glyph table for a font and save it in an image file. Here's how you do it:

 // I'm generating the glyphs differently for testing. // I tested with fontName="Arial" Typeface face = new Typeface(fontName); GlyphTypeface font; if (!face.TryGetGlyphTypeface(out font)) return; // bail if something goes wrong int ColumnCount = 10; int MaxDrawCount = 30; // use int.MaxValue to draw them all double fontSize = 50d; // the height of each cell has to include over/underhanging glyphs Size cellSize = new Size(fontSize, fontSize * font.Height); var Glyphs = from glyphIndex in font.CharacterToGlyphMap.Values select font.GetGlyphOutline(glyphIndex, fontSize, 1d); // now create the visual we'll draw them to DrawingVisual viz = new DrawingVisual(); int drawCount = -1; using (DrawingContext dc = viz.RenderOpen()) { foreach (var g in Glyphs) { drawCount++; if (drawCount >= MaxDrawCount) break; // don't draw more than you want if (g.IsEmpty()) continue; // don't draw the blank ones // center horizontally in the cell double xOffset = (drawCount % ColumnCount) * cellSize.Width + cellSize.Width / 2d - g.Bounds.Width / 2d; // place the character on the baseline of the cell double yOffset = (drawCount / ColumnCount) * cellSize.Height + fontSize * font.Baseline; dc.PushTransform(new TranslateTransform(xOffset, yOffset)); dc.DrawGeometry(Brushes.Red, null, g); dc.Pop(); // get rid of the transform } } int RowCount = drawCount / ColumnCount; if (drawCount % ColumnCount != 0) RowCount++; // to include partial rows int bitWidth = (int)Math.Ceiling(cellSize.Width * ColumnCount); int bitHeight = (int)Math.Ceiling(cellSize.Height * RowCount); RenderTargetBitmap bmp = new RenderTargetBitmap( bitWidth, bitHeight, 96, 96, PixelFormats.Pbgra32); bmp.Render(viz); PngBitmapEncoder encoder = new PngBitmapEncoder(); encoder.Frames.Add(BitmapFrame.Create(bmp)); using (FileStream file = new FileStream("FontTable.png", FileMode.Create)) encoder.Save(file);
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For those who want to render geometry with a fixed size, this is the code for this:

 const int TargetSize = 14; private static void Save(Geometry geometry, string fileName) { var rect = geometry.GetRenderBounds(new Pen(Brushes.Black, 0)); var bigger = rect.Width > rect.Height ? rect.Width : rect.Height; var scale = TargetSize / bigger; Geometry scaledGeometry = Geometry.Combine(geometry, geometry, GeometryCombineMode.Intersect, new ScaleTransform(scale, scale)); rect = scaledGeometry.GetRenderBounds(new Pen(Brushes.Black, 0)); Geometry transformedGeometry = Geometry.Combine(scaledGeometry, scaledGeometry, GeometryCombineMode.Intersect, new TranslateTransform(((TargetSize - rect.Width) / 2) - rect.Left, ((TargetSize - rect.Height) / 2) - rect.Top)); RenderTargetBitmap bmp = new RenderTargetBitmap(TargetSize, TargetSize, // Size 96, 96, // DPI PixelFormats.Pbgra32); DrawingVisual viz = new DrawingVisual(); using (DrawingContext dc = viz.RenderOpen()) { dc.DrawGeometry(Brushes.Black, null, transformedGeometry); } bmp.Render(viz); PngBitmapEncoder pngEncoder = new PngBitmapEncoder(); pngEncoder.Frames.Add(BitmapFrame.Create(bmp)); using (FileStream file = new FileStream(fileName, FileMode.Create)) pngEncoder.Save(file); }
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I use this:

  private void GenerateFontMap(string PathTofont, int GlyphsPerRow, int WidthAndHeight) { GlyphTypeface font = new GlyphTypeface(new Uri(PathTofont)); List<ushort> fontNum = new List<ushort>(); foreach (KeyValuePair<int, ushort> kvp in font.CharacterToGlyphMap) { fontNum.Add(kvp.Value); } if (fontNum.Count > 0) { int mapWidth = WidthAndHeight * GlyphsPerRow; int mapHeight = WidthAndHeight * ((fontNum.Count + 1) / GlyphsPerRow + 1); Bitmap b = new Bitmap(mapWidth, mapHeight); Graphics g = Graphics.FromImage(b); System.Windows.Media.Pen glyphPen = new System.Windows.Media.Pen(System.Windows.Media.Brushes.Black, 1); Geometry glyphGeometry; GeometryDrawing glyphDrawing; PngBitmapEncoder encoder; RenderTargetBitmap bmp; DrawingVisual viz; for (int i = 0; i < fontNum.Count; i++) { glyphGeometry = font.GetGlyphOutline(fontNum[i], WidthAndHeight, 1); glyphDrawing = new GeometryDrawing(System.Windows.Media.Brushes.Black, glyphPen, glyphGeometry); DrawingImage geometryImage = new DrawingImage(glyphDrawing); geometryImage.Freeze(); viz = new DrawingVisual(); DrawingContext dc = viz.RenderOpen(); dc.DrawImage(geometryImage, new Rect(0, 0, geometryImage.Width, geometryImage.Height)); dc.Close(); bmp = new RenderTargetBitmap(WidthAndHeight, WidthAndHeight, 96, 96, PixelFormats.Pbgra32); bmp.Render(viz); encoder = new PngBitmapEncoder(); encoder.Frames.Add(BitmapFrame.Create(bmp)); MemoryStream myStream = new MemoryStream(); encoder.Save(myStream); g.DrawImage(System.Drawing.Bitmap.FromStream(myStream), new PointF((i - (i / GlyphsPerRow) * GlyphsPerRow) * WidthAndHeight, i / GlyphsPerRow * WidthAndHeight)); } g.Dispose(); b.Save("map.png", ImageFormat.Png); b.Dispose(); } }
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See my answer. In general, you should use the RenderTargetBitmap class.

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Source: https://habr.com/ru/post/1393978/

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