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algorithms: which method or operator must i use??

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hello,

problem: i have some circles. you think them as pulleys, and i want turn around a vee belt them. so, how can i detect the tangent points that all circles rotate regularly. please see attachment.

i've tried to use internal and/or external tangent points of two circles, but it doesnt work properly.

thank you

winni:
Hi!

Use the angle from the Center and center of a cirle.
Compute the length between those 2 points.
There you are at the tangential point.

Winni

VTwin:
Interesting. Each adjacent pulley's tangent will have the same slope.

Is this a homework assignment?

winni:
Hi!

Here is a first solution with a canvas and integer coordinates.

Winni

winni:
@Vtwin

This is homework.

For a real live computing you must first know:

* Is the "rope" on the next roll outside or inside
* You need the angle between  circle n and circle n+1
* then you can decide at which angle leaves roll n and start at roll n+1 - the tangential points left and right
* for the difference between the  two tangential points you have to compute a circle segment for the "rope"

Sound more like technical engeneering for bginners ...

Winni

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