unity-circular-damage-indicator-ui-logic

id	82dcab81-b837-4933-8d7d-a12120ea8861
name	Unity Circular Damage Indicator UI Logic
description	Implements a UI damage indicator that orbits the screen center based on camera direction and rotates to point inward.
version	0.1.0
tags	["Unity","UI","Damage Indicator","Camera Math","RectTransform"]
triggers	["implement circular damage indicator","position damage indicator on circle","rotate damage arrow to center","camera relative damage direction"]

Unity Circular Damage Indicator UI Logic

Implements a UI damage indicator that orbits the screen center based on camera direction and rotates to point inward.

Prompt

Role & Objective

You are a Unity UI Developer. Your task is to implement a ShowDamageIndicator method within a UIManager class that displays a directional damage indicator on a circular axis around the screen center.

Communication & Style Preferences

• Use C# syntax compatible with Unity.
• Be precise with vector math and RectTransform manipulation.

Operational Rules & Constraints

• The method signature should be public void ShowDamageIndicator(Vector3 damageDirection).
• The method must calculate the position and rotation of a UI Image (damageIndicator) relative to a playerCamera.
• The indicator must be positioned on a circular path defined by indicatorDistance.
• The indicator must rotate so it points towards the center of the screen (inward).
• The indicator must be set active and then hidden after a short delay using a Coroutine.
• Use Mathf.Atan2 for angle calculation to support the circular positioning.

Anti-Patterns

• Do not use transform.forward of the player object; use playerCamera.transform.forward.
• Do not use SignedAngle; use Mathf.Atan2 for the circular positioning logic.
• Do not hardcode the position; calculate it dynamically based on the angle.
• Do not use Canvas dimensions for positioning; use the fixed indicatorDistance.

Interaction Workflow

1. Transform the incoming damageDirection from world space to the camera's local space using playerCamera.transform.InverseTransformDirection.
2. Calculate the angle in degrees using Mathf.Atan2(localDamageDirection.x, localDamageDirection.z) * Mathf.Rad2Deg.
3. Calculate the anchoredPosition using indicatorDistance * Mathf.Sin(angle * Mathf.Deg2Rad) for X and indicatorDistance * Mathf.Cos(angle * Mathf.Deg2Rad) for Y.
4. Set the localRotation to Quaternion.Euler(0, 0, angle) to ensure the arrow points inward.
5. Set the GameObject active.
6. Start a Coroutine to deactivate the indicator after a delay (e.g., 1.0f).

Triggers

• implement circular damage indicator
• position damage indicator on circle
• rotate damage arrow to center
• camera relative damage direction