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Category Archives: transformations
Map device coordinates to world coordinates in C#
Sometimes it’s convenient to draw in one coordinate system (called world coordinates) and map those coordinates to the screen’s device coordinates. The example Map points between coordinate systems in C# shows how to do this in C#. For example, the … Continue reading
Draw improved text on a curve in C#
This example shows how to draw improved text along a curved path. The example Draw text on a curve in C# shows how to draw text along a curved path. Unfortunately the spacing between the letters is pretty mediocre in … Continue reading
Interactively rotate images in C#
The example Rotate images by an arbitrary angle in C# explains how you can rotate an image by a angle specified in a TextBox. This example lets you click and drag around the image’s center to specify the angle of … Continue reading
Rotate images in C#
This program uses the following RotateBitmap method to rotate an image. // Return a bitmap rotated around its center. private Bitmap RotateBitmap(Bitmap bm, float angle) { // Make a Matrix to represent rotation // by this angle. Matrix rotate_at_origin = … Continue reading
Easily map drawing coordinates in C#
The example Map points between coordinate systems in C# shows several ways you can map drawing coordinates to screen coordinates. They all work but these sorts of coordinate conversions are really common if you’re doing more advanced graphics so I … Continue reading
Posted in drawing, graphics, transformations
Tagged C#, C# programming, device coordinates, drawing, drawing coordinates, example, example program, graphics, map coordinates, Matrix, rotate, rotation, scale, scaling, transform, transformations, translate, translation, Windows Forms programming, world coordinates
1 Comment
Draw text on a line segment in C#
This example shows how you can draw text on a line segment. The key is the DrawTextOnSegment method shown in the following code. This method can draw text on a line segment or below a line segment. // Draw some … Continue reading
Posted in algorithms, drawing, fonts, graphics, transformations
Tagged algorithms, C#, C# programming, draw text, draw text on a line, draw text on a line segment, drawing, example, example program, fonts, graphics, line segment, text, text on a line segment, transformations, Windows Forms programming
4 Comments
Make CAPTCHA images with overlapping characters in C#
The following MakeCaptchaImage2 method creates a Bitmap containing a CAPTCHA image. private Random Rand = new Random(); // Draw the words with letters overlapping each other. private Bitmap MakeCaptchaImage2(string txt, int wid, int hgt, Font the_font, Brush the_brush) { Bitmap … Continue reading