Flip a card so the face changes at the edge, even if the player flips back mid-turn

Memory and card games live on the flip. The picture must change at the exact moment the card is edge-on, and if the player taps again in the middle, the card should turn back from where it is, not start over or finish first. Here is a flip driven by its angle that handles all of this.

Why this works

A flip is just a turn, so the card needs to know only how far it has turned. When everything shown comes from that one amount, a tap in the middle simply reverses the turn, and the picture changes at the edge on its own.

When not to use it

Do not allow reversing when a flip carries a cost or a consequence, such as a turn that counts as a move. A take-back then lets players peek for free. Lock the card until the flip is finished.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• A diagram of every state
• 28 lines of example code with 3 checks that pass
• How your AI shows you that it works

Say this to your AI

Use the Spielerando entry "Flip a card so the face changes at the edge, even if the player flips back mid-turn" (read_entry casual-card-flip-that-can-be-reversed-midway) in my game. Build it step by step, and show me how you checked that it works.

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