user control project

user control project

Must Read

1. A rotated ellipse from three points

good link to another github site

2. Pitteway's algorithm for drawing conic curves

In 1967, just a couple of years after Jack Bresenham published his well known line-drawing algorithm [1], M.L.V. Pitteway published a more general version of the algorithm [2]. Pitteway's algorithm is based on similar principles, but can draw conic curves — ellipses, parabolas, and hyperbolas.

3. jvanaken1 / conic-draw

In 1967, just a couple of years after Jack Bresenham published his well known line-drawing algorithm [1], M.L.V. Pitteway published a more general version of the algorithm [2]. Pitteway's algorithm is based on similar principles, but can draw conic curves — ellipses, parabolas, and hyperbolas.

4. Three Points (Two Opposing) Define an Ellipse

Update on 2021-06-21: three (or even four) points in general do not define an ellipse. But the additional information that the first and last of the three points are at opposite ends do define an ellipse. Equivalently, two on-curve points and the center point define an ellipse.

This blog post also primarily discusses a 4-piece cubic Bézier approximation to that ellipse. That ellipse (not just its approximation) is still well-defined, but this blog post does not derive a closed form for it. For vector graphic rasterization, the Bézier approximation is good enough.

5. Working With Absolute Positions in .NET Graphics

An absolute set of coordinates to simplify graphics in .NET.

More User controls

6. Ellipse drawing algorithm

A basic algorithm for drawing ellipses on a window

7. The Spiral TrackBar Control

In this article, you will learn about the SpiralTrackBar class. This class is a replacement for the .NET 2.0 TrackBar control, which displays the track line as a spiral.

8. The Amazing ProgressBar Control

A progress bar which displays progress as passage through a simple maze.

9. Proper Resizing of SplitterContainer Controls at any DPI

A method of ensuring that SplitterContainer controls with fixed panels are properly resized when AutoScaleMode is ScaleMode.DPI

10. CircleControl - A Circular Motion Control

A circular motion control

11. Best-fitting line, circle and ellipse

Library for least-squares best-fitting of lines, circles and rotated ellipses

12. Work with bitmaps faster in C#

You can increase the speed of both SetPixel and GetPixel by doing the following:Add the line 'int step = 0' at the LockBitmap class level.Remove 'int' declation of 'step' in the LockBits method and calculate as is.In both SetPixel and GetPixel, remove the line:int cCount = Depth /...

13. Bitmap.SetPixel(Int32, Int32, Color) Method

Sets the color of the specified pixel in this Bitmap.

14. Bitmap.LockBits Method

Locks a Bitmap into system memory.

15. Fast work with Bitmaps in C#

I need to access each pixel of a Bitmap, work with them, then save them to a Bitmap. Using Bitmap.GetPixel() and Bitmap.SetPixel(), my program runs slowly.

16. A thermometer control
17. Elliptical Rotating Picture Tray and Editor

A picture tray that rotates around an ellipse of flexible size and angle, with an editor for C#.

18. Introduction to Numerical Methods

Introduction to Numerical Methods and Updated Polynomial Class

19. Orbital Mechanics Introduction

Introduction to Orbital Mechanics - 2 Body Problem

20. Drawing Gears - Circular and Non Circular

Learn about gears and by using the jpg's be able to cut working gears in wood and other materials

21. Clock

Simple clock using line transform

22. Rubberband Lines

Using the rubberband line as a ruler.

23. Magic Graphics

A library that lets you easily manipulate your drawings

24. Extensions to DrawTools

DrawTools library extended to include Layers, Zoom, Pan, Rotation

25. Shape Control for .NET

Implementing shape control that supports transparency, custom design-time editors and simple animation

26. Handling Touch, Pen, or Mouse Digitizer input in your .NET Application

A simple application that shows how you can determine whether user input is from a mouse, tablet digitizer, or touch.

27. CCanvas - A Reusable Class to Draw a Simple Graph

A reusable class for drawing a simple graph

28. Introduction to GDI+ in .NET

In this article, we’ll see basics of GDI+ and how GDI+ is much better interface than its predecessor GDI.

29. Custom ProgressBar Control

Easy to use ProgressBar Control with many properties

30. gTrackBar - A Custom TrackBar UserControl (VB.NET)

TrackBar with custom coloring, value display, label, and increment buttons.

31. RoundButton Windows Control - Ever Decreasing Circles

A Windows round button control in C# with designer support

32. Rytz's construction

The Rytz’s axis construction is a basic method of descriptive Geometry to find the axes, the semi-major axis and semi-minor axis and the vertices of an ellipse, starting from two conjugated half-diameters. If the center and the semi axis of an ellipse are determined the ellipse can be drawn using an ellipsograph or by hand (see ellipse).

33. Steiner Ellipse, Minimal Area Through Three Points

The Steiner ellipse has the minimal area surrounding a triangle. It is characterized by having its center coincident with the triangle's centroid.

34. Finding the ellipse center from three points.

Fig 7 - uploaded by Dong Joong Kang

35. Elliptical Pizza Theorem

very good one

36. Ellipse from 3 points

I found these equations I call the Eliptical Pizza theorem because it looks like a pizza under perspective adjustments, I thought maybe they could be useful for a possible new feature of geogebra to calculate an ellipse from 3 points, once you calculate 2 other points using these equations you can then use the conic from 5 points to get the ellipse from three given points..http://benpaulthurstonblog....

37. Elliptical Pizza Theorem

Elliptical Pizza Theorem

38. Passing an ellipse through 3 points (where 2 two points lie on the ellipse axes)? [Updated with alternative statement of problem and new picture]

Passing an ellipse through 3 points (where 2 two points lie on the ellipse axes)? [Updated with alternative statement of problem and new picture]

39. How to find the equation for an ellipse from 3 points using python

I am bulding a game and I need to creat a map for it. in order to do it i have to use two kinds of elipse: one that is found using 2 points and one that found using 3 points (and go through them). I have found a way to find the equation with 2 points but now I have not found a way to do with 3 point. So I am looking to find the equation for an ellipse given 3 point. that is how i have done 2 points (it is not elegant but it does the job great):

40. How many points does it take to define…

You know how it is. One moment you are relaxing on the grass with some friends discussing the weather, the next you start stretching your mind as to how many points it takes to define various shapes: ellipses, ellipsoids, triangles, what not. Let’s take a peek at this sort of problem. We’ll start with circles. One of the first things that you learn in school about circles, is that any three noncollinear points define the circumference of one circle, and one circle only. Lets see how that is. First we show that we can indeed construct a circle that will pass through all three points. Let’s label our points A, B, and C.