Small adjustments are required to make this work as intended: TextRenderingHint.ClearTypeGridFit gives a better result when rendering the Text. It’s more precise and works well with the grid-fitting nature of Graphics.DrawString. See the notes you can find in the answer linked below for more informations on this matter. StringFormat alignment in both horizontal and vertical … Read more
You could try putting the following in your constructor after the InitiliseComponent call. SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true); EDIT: If you’re giving this a go, if you can, remove your own double buffering code and just have the control draw itself in response to the appropriate virtual methods being called.
Fast access to pixels are possible using LockBits() method of the Bitmap. This will return to you an object containing a pointer to the start of the pixel data and you can use unsafe code to access the memory. https://web.archive.org/web/20150330113356/http://bobpowell.net/lockingbits.aspx
If you want really round corner and not only transparent trick you can use this example: private int radius = 20; [DefaultValue(20)] public int Radius { get { return radius; } set { radius = value; this.RecreateRegion(); } } [System.Runtime.InteropServices.DllImport(“gdi32.dll”)] private static extern IntPtr CreateRoundRectRgn(int nLeftRect, int nTopRect, int nRightRect, int nBottomRect, int nWidthEllipse, int … Read more
In the simplest form, just plug the coordinates into the line equation and check for equality. Given: Point p (X=4, Y=5) Line l (Slope=1, YIntersect=1) Plug in X and Y: Y = Slope * X + YIntersect => 5 = 1 * 4 + 1 => 5 = 5 So yes, the point is on … Read more
Using reflector, it turns out Image.Save() boils down to the GDI+ function GdipSaveImageToFile, with the encoderParams NULL. So I think the question is what the JPEG encoder does when it gets a null encoderParams. 75% has been suggested here, but I can’t find any solid reference. EDIT You could probably find out for yourself by … Read more
The problem is int center = radius which you are setting int radius = 576. This doesn’t make sense as surely you are rotating about a point that should have an x and y location. Given you are rotating around the origin the center x and y should both be 0 not 576. So, given … Read more
Never use [Control].CreateGraphics, unless you need this object for immediate use in a specific environment. To measure the size of text when drawn in a specific graphics context, for example. When you need the drawing to persist, as painting on the surface of a control, use the Graphics object provided by the PaintEventArgs of the … Read more
I’d use CreateCompatibleBitmap, and then call SetDIBits to fill it with your data. These are functions I have seen to work, and SetDIBits is quite flexible, although verbose. In my MFC years, CreateBitmap was avoided due to suspected performance issues.
When drawing a string of characters (ASCII or a form of Unicode encoded symbols) using Graphics.DrawString() with a fixed sized Font, the resulting graphics appear to generate a sort of grid, degrading the visual quality of the rendering. A solution is to substitute the GDI+ Graphics methods with the GDI methods, using TextRenderer.MeasureText() and TextRenderer.DrawText(). … Read more