Tag Archives: polygon

Clip a line segment to a polygon in C#

Posted on January 23, 2016 by RodStephens

This example finds the pieces of a line segment that lie inside and outside of a polygon. It draws the parts of the segment that lie outside of the polygon with a pink background and it draws parts of the … Continue reading →

Posted in algorithms, drawing, graphics, mathematics | Tagged algorithms, C#, C# programming, drawing, example, example program, graphics, line segment, mathematics, polygon, segment, Windows Forms programming | Leave a comment

Enlarge a polygon in C#

Posted on January 16, 2016 by RodStephens

This example shows how you can enlarge a polygon by a certain distance. For example, you can use it to move the edges of the polygon outward by 10 pixels. The program lets you use the mouse to define the … Continue reading →

Posted in algorithms, drawing, graphics, mathematics | Tagged algorithms, C#, C# programming, drawing, enlarge polygon, example, example program, graphics, intersecting lines, intersection, mathematics, parallel lines, polygon, Windows Forms programming | 1 Comment

Platonic Solids Part 1: What are the Platonic solids?

Posted on November 28, 2015 by Rod Stephens

This is the first in a series of posts about the Platonic solids. These posts will show how to find the corners of six Platonic solids: tetrahedron, cube (hexahedron), octahedron, dodecahedron, and icosahedron. Deriving these values requires only algebra and … Continue reading →

Posted in algorithms, graphics, mathematics, wpf | Tagged 3D, algorithms, C#, C# programming, cube, dodecahedron, dual, dual solids, example, example program, geometry, graphics, hexahedron, icosahedron, mathematics, octahedron, platonic solids, polygon, polytope, polytopes, regular polygon, regular polytopes, regular solids, solids, tetrahedron, Windows Forms programming, WPF | 2 Comments

Draw symmetric compound lines in WPF and C#

Posted on September 22, 2015 by RodStephens

I’ve often said that WPF’s unofficial slogan should be, “Twice as flexible and only 10 times as hard.” Drawing compound lines is one of the few places where WPF isn’t twice as flexible. A compound line is one that is … Continue reading →

Posted in algorithms, drawing, graphics | Tagged algorithms, C#, C# programming, compound lines, drawing, example, example program, graphics, lines, polygon, Windows Forms programming | Leave a comment

Render polygons and polylines in a WPF program using C#

Posted on April 28, 2015 by Rod Stephens

WPF lets you do all sorts of interesting things that are much harder in Windows Forms applications. However sometimes, as in this example, it makes simple things much harder. (WPF’s slogan should be, “Twice as flexible and only five times … Continue reading →

Posted in drawing, extension methods, geometry, graphics, wpf, XAML | Tagged C#, C# programming, draw polygon, draw polyline, draw strings, draw text, drawing, DrawPolygon, DrawPolyline, example, example program, extension methods, geometry, graphics, OnRender, polygon, Polyline, render, rendering, strings, text, Windows Forms programming, WPF, XAML | 2 Comments

Fill a polygon with a PathGradientBrush in C#

Posted on August 27, 2014 by Rod Stephens

A PathGradientBrush defines a brush that shades smoothly from a “center point” to specific points along a path. This example fills a hexagon with colors that shade from white in the center to red, yellow, lime, cyan, blue, and magenta … Continue reading →

Posted in graphics | Tagged brush, C#, C# programming, Dispose, drawing, example, example program, fill polygon, graphics, PathGradientBrush, polygon, using, using statement, Windows Forms programming | 2 Comments

Draw striped lines in C#

Posted on August 25, 2014 by Rod Stephens

You can use the Pen class to draw striped lines. That class’s CompoundArray property stores an array of floats that gives the fraction of the line’s width that is drawn and skipped. For example, the array 0.0, 0.25, 0.75, 1.0 … Continue reading →

Posted in drawing, graphics | Tagged C#, C# programming, compound lines, draw lines, drawing, example, example program, graphics, lines, polygon, Polyline, striped lines, Windows Forms programming | Leave a comment

Draw a star with a given number of points in C#

Posted on August 25, 2014 by Rod Stephens

My goal here was to draw a “normal” star where the interior concave angles were located at intersections of lines connecting the exterior convex points. This turned out to be a more interesting problem than I expected. There’s only one … Continue reading →

Posted in algorithms, geometry, graphics, mathematics | Tagged C#, C# programming, Cos, draw stars, drawing, example, example program, geometry, graphics, mathematics, polygon, Sin, stars, Windows Forms programming | 2 Comments

Draw a non-intersecting star in C#

Posted on August 25, 2014 by Rod Stephens

The following NonIntersectingStarPoints method generates the points needed to draw a non-intersecting star and returns them in an array. // Return PointFs to define a non-intersecting star. private PointF[] NonIntersectingStarPoints( int num_points, Rectangle bounds) { // Make room for the … Continue reading →

Posted in drawing, geometry, graphics, mathematics | Tagged C#, C# programming, Cos, draw stars, drawing, example, example program, geometry, graphics, mathematics, non-intersecting star, polygon, Sin, stars, Windows Forms programming | Leave a comment

Draw a star in C#

Posted on August 25, 2014 by Rod Stephens

The following StarPoints method generates the points needed to draw a star and returns them in an array. // Return PointFs to define a star. private PointF[] StarPoints(int num_points, Rectangle bounds) { // Make room for the points. PointF[] pts … Continue reading →