Tell tap, hold, drag, pan and pinch apart on a phone strategy game

On a phone, one finger can mean select, hold for a menu, or scroll the map, and two fingers can mean zoom or move. A shaky tap becomes a drag, or a zoom moves the map as well. Here is how to classify a touch so these things do not fight each other.

Why this works

A finger never stays perfectly still, so the question is how far it wandered and for how long, not where it ended. Judging the whole touch once it is finished, with a small allowance for shaking, lets tap, hold, drag and zoom each have a clear border.

When not to use it

Not for games played with a mouse or buttons, and not for a game with a single touch use such as tap only, where the extra rules only add chances to misread. If a game needs fast, precise reactions, put on-screen buttons instead of gestures.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 4 common mistakes and the fix
• 20 lines of example code with 4 checks that pass
• How your AI shows you that it works

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