Drawing Lines with Pixels

This Drawing Lines with Pixels activity & project also includes:

How do the computers keep it straight? Using the provided algorithms, class members draw a line and a circle using pixels. They then check the drawings using a straight edge and compass to determine the accuracy of their drawings. 

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CCSS: Adaptable
Instructional Ideas

  • Use a drawing program that uses bitmaps, such as Paint, and magnify a line until the pixels are visible
  • Have the pupils record the values they calculate while performing the algorithm
Classroom Considerations

  • Younger classes may not know about negative numbers

  • Provides an opportunity for pupils to try to draw before giving them an algorithm

  • The description of Brensenham’s Line Algorithm is confusing due to the fact that "A" and "B" are also the endpoints of the line segment
  • Page formatting is off, with a large portion of white space and graphs running into the text
Common Core