changeview

changeview - Changing Point of View - - - - TeffalHead...

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Sheet1 Page 1 Changing Point of View -------- ----- -- ---- TeffalHead FatBody has stayed out too late on the planet BadTrash and is in danger of being consumed by a Larger BageGarLectorCol. To get to safety TeffalHead must get to base A or base B or the ZoomTube that connects them. He knows his own position, C, and the ZoomTube is a perfectly straight line between A and B (woe betide a zoomer in a curved ZoomTube). TeffalHead needs to know immediately which he is closest to, A, B, or some point on the ZoomTube between A and B. TeffalHead knows the xy-coordinates of points A, B, and C. Like any good robotminded soul, he expects to trans- late and rotate the xy-coordinate system to make a new x'y'-coordinate system in which A has x'y'-coordinates (0,0) and B has x'y'-coordinates (L,0), where L is the distance from A to B. Then the answer can be easily read from the x' coordinate of C. Unfortunately, living up to his first name, which means `forgetful in emergencies', TeffalHead has forgotten the
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changeview - Changing Point of View - - - - TeffalHead...

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