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The Mercator projection is available as d3.geo.mercator.

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This example is the second of three in the Path Transitions tutorial; see the previous example for context.

The desired pairing of numbers for path interpolation is like this:

M x0, y0 L x1, y1 L x2, y2 L x3, y3 L xR, y4
   ↓   ↓    ↓   ↓    ↓   ↓    ↓   ↓
M xl, y0 L x0, y1 L x1, y2 L x2, y3 L x3, y4

Where xl is some negative value off the left side, and xr is some positive value off the right side. This way, the first point ⟨x0,y0⟩ is interpolated to ⟨xl,y0⟩; meaning, the x-coordinate is interpolated rather than the y-coordinate, and so the path appears to slide off to the left. Likewise, the incoming point ⟨xr,y4⟩ is interpolated to ⟨x3,y4⟩.

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echo -n This file system is case- > tmp; echo -n in >> TMP; echo sensitive >> tmp; cat tmp; rm tmp; rm TMP 2> /dev/null