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. 

Concepts

drawing lines, circles, pixels, computers, computer science, technology resources

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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

Pros

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

Cons

• 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

7.NS.A.3 MP5 MP6