This screen is accessible from the main chart screen, pressing “Line”.

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A pitchfork is created from three points. You need to define the sides of the fork first, then the center.

Define the first point using a pan gesture
pan one finger. Pan with one finger to the point you want the line pivot to be. When you remove your finger off the screen, the point is highlighted in red.

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Define the second point using a pan gesture
pan one finger.

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Define the second point using a pan gesture
pan one finger. Once you remove your finger, the pitchfork is created.

Screenshot 2013.09.23 13.23.12