Color fillColor = Color.FromArgb(0, 0, 0, 0); //(a, r, g, b) e.Graphics.FillRectangle(new SolidBrush(fillColor), e.ClipRectangle); This is actually rather amusing. It means that you are drawing something completely transparent – so this changes absolutely nothing! 🙂 Guess: if black (0,0,0) should mean “glass”, how about drawing (1,1,1) to get (almost) black?
I needed this functionality also. I made a class that inherits PictureBox, overrides OnPaint and adds a property to allow the interpolation mode to be set: using System.Drawing.Drawing2D; using System.Windows.Forms; /// <summary> /// Inherits from PictureBox; adds Interpolation Mode Setting /// </summary> public class PictureBoxWithInterpolationMode : PictureBox { public InterpolationMode InterpolationMode { get; set; } … Read more
You can use the Windows Imaging Component to load PNG files (on Windows XP SP2 and later). See MSDN Magazine (original in web archive – a bit better formatting) for an introduction on how to use the API and my blog post for a code sample that loads a PNG from an IStream and converts … Read more
As a simple approach, you can just factor the RGB values: Color c1 = Color.Red; Color c2 = Color.FromArgb(c1.A, (int)(c1.R * 0.8), (int)(c1.G * 0.8), (int)(c1.B * 0.8)); (which should darken it; or, for example, * 1.25 to brighten it)
The following objects cause a GDI handle to be created: Bitmap Brush DC Enhanced Metafile Enhanced Metafile DC Font Memory DC Metafile Metafile DC Palette Pen Extended Pen Region This list was drawn up by using the information from here: https://learn.microsoft.com/en-gb/windows/desktop/SysInfo/gdi-objects
When you are loading an imagefrom a Stream, You have to keep the stream open for the lifetime of the image, see this MSDN Image.FromStream. I think the exception is caused because the memory stream gets closed even before the image gets disposed. You can change your code like this: byte[] bitmapData = new byte[imageText.Length]; … Read more
To fix the text “blockiness”, can’t you just do… g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit; after this line… Graphics g = Graphics.FromImage( (Image) image );
The option I used to workaround this problem was: Graphics graphics = new Graphics(); graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit; There are some others useful options in TextRenderingHint Hope it helps
There is an excellent blog post including C# code about using the ImageMagick graphics library through Interop over at TopTen Software Blog. This post deals specifically with running ASP.net on linux under mono; however, the C# code should be perfectly copy-paste-able, the only thing you’ll need to change is the Interop attributes if you are … Read more
TextRenderer uses GDI to render the text, whereas Graphics uses GDI+. The two use a slightly different method for laying out text so the sizes are different. Which one you should use depends on what will eventually be used to actually draw the text. If you are drawing it with GDI+ Graphics.DrawString, measure using Graphics.MeasureString. … Read more