
Recent Posts

Recent Comments
Archives
 August 2019
 July 2019
 June 2019
 May 2019
 April 2019
 March 2019
 February 2019
 January 2019
 December 2018
 November 2018
 October 2018
 September 2018
 August 2018
 July 2018
 June 2018
 May 2018
 April 2018
 March 2018
 February 2018
 January 2018
 December 2017
 November 2017
 October 2017
 September 2017
 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
 February 2014
 January 2014
 December 2013
 October 2013
 August 2013
 June 2013
 December 2012
 September 2012
 July 2012
 June 2012
 November 2011
 May 2011
 April 2011
 February 2011
 December 2010
Categories
 .NET
 3D
 3D graphics
 ADO.NET
 algorithms
 animation
 API
 arrays
 attributes
 audio
 books
 C#
 C# programming
 calculations
 challenges
 classes
 clipboard
 coding
 combinatorics
 console
 controls
 cryptography
 curve fitting
 database
 debugging
 dialogs
 directories
 Drag and Drop
 drawing
 drawings
 enums
 Event
 events
 example program
 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
 threedimensional graphics
 tips
 tools
 transformations
 Uncategorized
 user interface
 variables
 VBA
 web
 Windows Forms programming
 WMI
 Word
 wpf
 XAML
 XML
Meta
Tag Archives: circle
Use sines and cosines to draw circles and ellipses in C#
This example shows how you can use trigonometric functions to draw circles. It’s such a basic technique that I often forget that it’s not completely obvious to everyone. Given a radius R and an angle θ, the equations x = … Continue reading
Posted in drawing, graphics, mathematics
Tagged C#, C# programming, circle, draw circles, drawing, ellipse, example, example program, graphics, mathematics, Windows Forms programming
Leave a comment
Draw text on a circle in C#
This example uses some of the techniques described in the post Measure character positions when drawing long strings in C# to draw text on a circle. The previous post explains how to determine where the characters in a string will … Continue reading
Posted in algorithms, fonts, geometry, graphics, strings
Tagged algorithms, C#, C# programming, characters, circle, circular text, draw string, draw text, draw text on circle, example, example program, fonts, geometry, graphics, measure characters, MeasureCharacterRanges, strings, text on a circle, text on circle, Windows Forms programming
1 Comment
Draw a circle through three points in C#
The perpendicular bisector of any chord on a circle passes through the circle’s center. To find the center given three points, simply find the perpendicular bisectors of the first two and last two pairs of points, and see where the … Continue reading
Posted in algorithms, drawing, graphics, mathematics
Tagged algorithms, C#, C# programming, circle, circle defined by points, circle defined by three points, circle through three points, circles, define circle, define circles, draw circle, drawing, example, example program, find circle, graphics, mathematics, Windows Forms programming
7 Comments
Find the tangent lines between two circles in C#
This example shows how you can find the tangent lines between two circles. Depending on how the circles are arranged, they can have 0, 2, or 4 tangent lines. If the circles don’t intersect, as on the left in Figure … Continue reading
Find the tangent lines between a point and a circle in C#
Finding the tangent lines between a point and a circle isn’t too hard if you’re familiar with the example Determine where two circles intersect in C#. Consider the figure on the right. R is the radius of the circle. You … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, circle, circleline tangent, example, example program, geometry, graphics, line, linecircle tangent, mathematics, tangent, Windows Forms programming
1 Comment
Calculate the formula for a circle selected by the user in C#
This example shows how to calculate the formula for a circle that the user has selected by clicking and dragging. The program uses the usual MouseDown, MouseMove, and MouseUp event handlers to let the user draw the circle. The only … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, circle, circle equation, example, example program, geometry, graphics, mathematics, Windows Forms programming
3 Comments
Determine where two circles intersect in C#
This example shows one method for finding where two circles intersect in C#. If you don’t like math, skip to the code below. Consider the figure on the right showing two circles with radii r0 and r1. The points p0, … Continue reading
Determine where a line intersects a circle in C#
The FindLineCircleIntersections method shown shortly finds the points where line intersects a circle. It takes as parameters a circle’s center point and radius, and two points on the line. It uses out parameters to return the coordinates of the points … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, circle, circle line intersection, circle line segment intersection, example, example program, geometry, graphics, line, line circle intersection, line intersects circle, line segment, line segment circle intersection, mathematics, point of intersection, Windows Forms programming
Leave a comment
Find a minimal bounding circle of a set of points in C#
The example Find the convex hull of a set of points in C# finds the convex hull of a set of points. A convex hull is the smallest convex polygon that encloses the points. This example extends that result to … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, bounding box, bounding circle, C#, C# programming, circle, convex hull, example, example program, geometry, graphics, hull, mathematics, minimal circle, Windows Forms programming
7 Comments