Monthly Archives: December 2019

Make an improved diagonal picture montage in C#

Posted on December 26, 2019 by RodStephens

My earlier example Make a Pinterest-style diagonal picture montage in C# showed how you could make a picture montage showing parts of images rotated by a desired angle. While using that program today I found a small bug. The areas … Continue reading →

Posted in drawing, graphics, image processing, tools | Tagged , , , , , , , , , , , , , | 1 Comment

Use VBA to randomize Excel selections

Posted on December 20, 2019 by RodStephens

The post Use VBA to randomize cells in Excel explains how you can randomize a simple selection’s rows. Unfortunately that method cannot randomize Excel selections in general. In particular it doesn’t work if the current selection includes multiple areas on … Continue reading →

Posted in Excel, VBA | Tagged , , , , , , , , , , | Leave a comment

Understand range areas in Excel VBA

Posted on December 18, 2019 by RodStephens

Most of my VBA examples assume that the current selection is a single block of cells. If the selection includes a single area, then you can easily loop through the cells that it contains. Unfortunately if the selection includes multiple … Continue reading →

Posted in Excel, VBA | Tagged , , , , , , , , , | 1 Comment

Let the user draw rotated skewed polygons in C#

Posted on December 13, 2019 by RodStephens

The example Let the user draw rotated polygons with right angles in C# draws polygons with edges that are parallel or perpendicular to a baseline. This example is very similar except its polygons have edges that are parallel to one … Continue reading →

Posted in algorithms, drawing, graphics, mathematics, transformations | Tagged , , , , , , , , , , , , | Leave a comment

Let the user draw rotated polygons with right angles in C#

Posted on December 8, 2019 by RodStephens

This example lets the user draw rotated polygons where all edges are either parallel or perpendicular to a defined baseline direction. As a result, all of the polygon’s angles are right angles. (And yes, I know that the polygons aren’t … Continue reading →

Posted in algorithms, drawing, graphics, mathematics, transformations | Tagged , , , , , , , , , , , , | Leave a comment

Let the user save an image of a smooth curve in C#

Posted on December 4, 2019 by RodStephens

The post Let the user draw a smooth curve in C# shows how you can let the user draw a smooth curve. This example extends that one to let you save the curve in an image file. There are a … Continue reading →

Posted in drawing, graphics | Tagged , , , , , , , , , , | Leave a comment