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Simple constraint

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If p₁ follows p₀, then p₁ gets its coordinates from the following set of equations:

dx = p^0_x - p_{1_x}
dy = p0y - p1y
l₁ = <sqrt>d_x²+d_y²</sqrt>
p_{1_dx} = d_x/l₁ * r - d_x
p_{1_dy} = d_y/l₁ * r - d_y

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