/// <summary>
/// project a normalized point on a trapezoid
/// </summary>
/// <param name="trapezoid">the trapezoid</param>
/// <param name="normPos">the normalize point</param>
/// <returns>absolute point relative to the given trapezoid</returns>
private Vector2 ProjectNormalizedPosition(UnityPlayerManagement.TrapezoidDefinition trapezoid, Vector2 normPos)
{
float worldY = MathHelpers.UnclampedLerp(trapezoid.nearPlane, trapezoid.farPlane, normPos.y);
float widthAtY = MathHelpers.UnclampedLerp(trapezoid.nearWidth, trapezoid.farWidth, normPos.y);
float worldX = -MathHelpers.UnclampedLerp(0, widthAtY / 2, normPos.x);
return(new Vector2(worldX, worldY));
}
/// <summary>
/// normalize a point in world to its relative position to a trapezoid
/// </summary>
/// <param name="trapezoid">the trapezoid</param>
/// <param name="worldPos">the world position</param>
/// <returns>the relative position of the point relative to the trapezoid</returns>
private Vector2 GetNormalizedTrapezoidPosition(UnityPlayerManagement.TrapezoidDefinition trapezoid, Vector3 worldPos)
{
float normalizedY = MathHelpers.UnclampedInverseLerp(trapezoid.nearPlane, trapezoid.farPlane, worldPos.z);
float widthAtY = MathHelpers.UnclampedLerp(trapezoid.nearWidth, trapezoid.farWidth, normalizedY);
float normalizedX = MathHelpers.UnclampedInverseLerp(0, widthAtY / 2, worldPos.x);
return(new Vector2(normalizedX, normalizedY));
}
/// <summary>
/// compute the screen position for a world 3d position
/// </summary>
/// <param name="worldPosition">the world point to map to screen</param>
/// <returns>screen position corresponding to worldPosition</returns>
Vector2 WorldToScreenProjection(Vector3 worldPosition)
{
UnityPlayerManagement.TrapezoidsPair trapezoidConfiguration = UnityPlayerManagement.GetAppliedTrapezoidsConfiguration();
if (trapezoidConfiguration == null)
{
return(Vector2.zero);
}
UnityPlayerManagement.TrapezoidDefinition worldTrapezoid = trapezoidConfiguration.innerTrapezoid;
Vector2 normalizedPosition = GetNormalizedTrapezoidPosition(worldTrapezoid, worldPosition);
normalizedPosition.x = Mathf.Clamp(normalizedPosition.x, -1 - m_boundarySize, 1 + m_boundarySize);
normalizedPosition.y = Mathf.Clamp(normalizedPosition.y, -m_boundarySize, 1 + m_boundarySize);
Vector2 projectedPosition = ProjectNormalizedPosition(m_screenTrapezoid, normalizedPosition);
projectedPosition.x += m_screenCoordinates.width / 2;
return(projectedPosition);
}