
Recent Posts

Recent Comments
 Make the user enter a float in C#  C# HelperC# Helper on Preview TextBox changes in C#
 RodStephens on Let the user draw polygons, move them, and add points to them in C#
 Günter on Let the user draw polygons, move them, and add points to them in C#
 Preview TextBox changes in C#, Part 2  C# HelperC# Helper on Preview TextBox changes in C#
 RodStephens on Calculate and highlight DataGridView values in C#
Archives
 August 2017
 July 2017
 June 2017
 May 2017
 April 2017
 March 2017
 February 2017
 January 2017
 December 2016
 November 2016
 October 2016
 September 2016
 August 2016
 July 2016
 June 2016
 May 2016
 April 2016
 March 2016
 February 2016
 January 2016
 December 2015
 November 2015
 October 2015
 September 2015
 August 2015
 July 2015
 June 2015
 May 2015
 April 2015
 March 2015
 February 2015
 January 2015
 December 2014
 November 2014
 October 2014
 September 2014
 August 2014
 July 2014
 June 2014
 May 2014
 March 2014
 February 2014
 January 2014
 December 2013
 November 2013
 October 2013
 September 2013
 August 2013
 July 2013
 June 2013
 May 2013
 April 2013
 March 2013
 February 2013
 January 2013
 December 2012
 November 2012
 October 2012
 September 2012
 August 2012
 July 2012
 June 2012
 May 2012
 April 2012
 January 2012
 December 2011
 November 2011
 May 2011
 April 2011
 February 2011
 December 2010
Categories
 .NET
 ADO.NET
 algorithms
 animation
 API
 arrays
 attributes
 audio
 books
 calculations
 challenges
 classes
 clipboard
 coding
 combinatorics
 console
 controls
 cryptography
 curve fitting
 database
 debugging
 dialogs
 directories
 Drag and Drop
 drawing
 drawings
 enums
 Event
 events
 Excel
 extension methods
 extensions
 files
 finance
 fonts
 formatting
 forms
 fractals
 ftp
 games
 GDI+
 generic
 geometry
 globalization
 graphics
 html
 IDE
 image processing
 inheritance
 interfaces
 internationalization
 internet
 interoperability
 LINQ
 lists
 localization
 mathematics
 memory
 menus
 MessageBox
 methods
 miscellany
 multimedia
 network
 Office
 OOP
 operators
 parsing
 performance
 phone
 PowerPoint
 printers
 printing
 productivity
 programs
 puzzles
 recursion
 reflection
 registry
 regular expressions
 serialization
 settings
 SQL
 stories
 strings
 syntax
 system
 threading
 tips
 tools
 transformations
 Uncategorized
 user interface
 variables
 VBA
 web
 Windows Forms programming
 WMI
 Word
 wpf
 XAML
 XML
Meta
Tag Archives: ellipse
Calculate where a line segment and an ellipse intersect in C#
Finding the intersection between a line segment and an ellipse requires a lot of mathematics. It’s not particularly hard mathematics, but if you’d rather skip it, you can use the following links to jump to the other parts of this … Continue reading
Posted in algorithms, drawing, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, drawing, ellipse, ellipse line intersection, ellipse/line intersection, example, example program, geometry, graphics, intersection, line, line ellipse intersection, line segment, line/ellipse intersection, mathematics, Windows Forms programming
5 Comments
Determine which pie slice is under the mouse in C#
When the program starts, the following code initializes the pie chart’s parameters. // The pie chart’s center. private Point EllipseCenter; // The pie chart’s drawing area. private Rectangle EllipseRect; // The ellipse’s X and Y radii. private float EllipseRx, EllipseRy; … Continue reading
Let the user draw rubber band ellipses (or other shapes) in C#
The following code shows how the program lets the user draw rubber band ellipses. // The ellipses to draw. private List<Rectangle> Ellipses = new List<Rectangle>(); // The points for the new ellipse we are drawing. private Point StartPoint, EndPoint; private … Continue reading
Posted in drawing, graphics
Tagged C#, C# programming, draw ellipse, ellipse, example, example program, graphics, rubber band, rubberband, Windows Forms programming
Leave a comment
Render an ellipse in a WPF program using C#
This example shows how you can render an ellipse in a WPF program. Normally to draw shapes in WPF you use some sort of object. You can add Ellipse, Line, Path, Polygon, Polyline, and Rectangle objects to a window and … Continue reading
Posted in drawing, geometry, graphics, wpf, XAML
Tagged C#, C# programming, drawing, ellipse, example, example program, geometry, graphics, OnRender, render, rendering, Windows Forms programming, WPF, XAML
2 Comments
Draw on a bitmap in C#
This example shows how you can draw on a bitmap and display the result on a form. The example Draw in a Paint event handler in C# shows how to draw in a form’s Paint event handler. This is simple, … Continue reading
Posted in drawing, graphics
Tagged Bitmap, C#, C# programming, drawing, ellipse, example, example program, graphics, smooth drawing, smoothing, smoothing mode, Windows Forms programming
1 Comment
Draw in a Paint event handler in C#
Using images and drawing in the Paint event handler are the two most common ways to display graphics. Drawing in the Paint event handler is easy, but there are a couple of things you should keep in mind when you … Continue reading
Posted in drawing, graphics
Tagged C#, C# programming, drawing, ellipse, example, example program, graphics, Paint event handler, smooth drawing, smoothing, smoothing mode, Windows Forms programming
11 Comments
See where a line intersects a conic section in C#
This example shows how you can see where a line intersects a conic section. You can use the more general method described in the post See where two conic sections intersect in C#. This example takes advantage of the simpler … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, conic section intersection, conic sections, ellipse, example, example program, geometry, graphics, intersection, line intersection, line segments, lines, mathematics, Windows Forms programming
Leave a comment
See where two conic sections intersect in C#
This example uses techniques demonstrated in several earlier posts to let you see where two conic sections intersect. To use the example, click the left mouse button five times each to select one conic section> Then click the right mouse … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, conic section, draw conic section, draw curve, draw ellipse, draw hyperbola, draw parabola, ellipse, equation, example, example program, geometry, graph equation, graphics, hyperbola, intersections, mathematics, parabola, points of intersection, Windows Forms programming
1 Comment
Select a conic section in C#
This example shows how you can let the user click five points to select a conic section. Recall that the equation for a conic section is: If you know the coordinates of some points on a conic section, then you … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, conic section, draw conic section, draw curve, draw ellipse, draw hyperbola, draw parabola, ellipse, equation, example, example program, geometry, graph equation, graphics, hyperbola, mathematics, parabola, select conic section, select curve, Windows Forms programming
Leave a comment
Draw a conic section from its polynomial equation in C#
This example shows how to draw a conic section from its polynomial equation. A previous series of posts explained how to find the intersection between two ellipses. See these posts for more information about that: See where two ellipses intersect … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, conic section, draw conic section, draw curve, draw ellipse, draw hyperbola, draw parabola, ellipse, equation, example, example program, geometry, graph equation, graphics, hyperbola, mathematics, parabola, Windows Forms programming
2 Comments