How to make your game character visible or hidden. Collision Detection Guide | Line - Line

This is my video series about different types of collision detection algorithms. This is episode #7.
In this episode I'll tell you how to solve the problem when you want your game characters to be able to see each other and what collision detection algorithm can be applied for this.
Coding for kids
Programming for kids

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References to helpful information and learning materials:
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Code used in this video:
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Jeff Thompson
Big thanks to Jeff Thompson for the final working formula for this collision detection type
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Sandbox to play with linear graphs
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GEOMETRY CONCEPTS PART 2: LINE INTERSECTION AND ITS APPLICATIONS. LINE-LINE INTERSECTION
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General Equation of a Line: ax + by = c
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Minimum Distance between
a Point and a Line

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The previous episodes you can find here: