Drawing Circles: Algorithm Tips & Notes

[Adam]

I don't have a computer graphics textbook, but I need to figure out the algorithms for drawing circles. Bresenham, and I think another one. Anyone got some notes or tips about this stuff?

 

[grady]

Search at gamedev.net http://www.gamedev.net/community/forums/topic.asp?topic_id=129995

http://www.gamedev.net/reference/articles/article767.asp

 

[ravenprp]

Drawing circles in computer graphics can be achieved using various algorithms, such as Bresenham's algorithm and Midpoint circle algorithm. These algorithms use mathematical calculations to determine the points on a circle and then connect them to create a smooth curve.

Some tips for implementing these algorithms include starting with a simple program to draw a line, as the circle can be thought of as a series of connected lines. It is also important to understand the concept of a pixel and how it relates to the coordinates of a circle.

Another useful tip is to break down the problem into smaller parts, such as drawing a quarter of a circle and then mirroring it to complete the full circle. This can make the implementation easier and more manageable.

When using Bresenham's algorithm, it is important to note that it uses integer calculations, which can lead to rounding errors. To avoid this, it is recommended to use floating-point calculations or incorporate error correction techniques.

Lastly, it is always helpful to refer to online resources or textbooks for a more in-depth understanding of these algorithms. Many websites offer step-by-step tutorials and code examples that can aid in the implementation of drawing circles.

In conclusion, drawing circles in computer graphics can be achieved with various algorithms, and with some tips and practice, it can be a fun and rewarding task. It is important to break down the problem, understand the concept of pixels, and utilize resources for a better understanding of these algorithms.