public override void OnGUI()
{
var positionId = EditorGUIUtility.GetControlID(kCenterGizmoHash, FocusType.Passive);
var radiusId = EditorGUIUtility.GetControlID(kRadiusGizmoHash, FocusType.Passive);
var position = GetValue(kExposureGizmoPosition);
var radius = GetValue(kExposureGizmoRadius);
var cameraPosition = GetValue(kCameraPosition);
var zoom = GetValue(kZoom);
var actualPosition = position * zoom + cameraPosition;
var actualRadius = radius * zoom;
Handles.color = Handles.xAxisColor;
actualPosition = EditorGUIX.PositionHandle2D(positionId, actualPosition, Styles.kPositionSize);
Handles.color = Handles.yAxisColor;
actualRadius = EditorGUIX.RadiusHandle2D(radiusId, actualPosition, actualRadius);
var newPosition = (actualPosition - cameraPosition) / zoom;
var newRadius = actualRadius / zoom;
if ((position - newPosition).sqrMagnitude > Styles.kPositionThreshold ||
Mathf.Abs(newRadius - radius) > Styles.kRadiusThreshold)
{
SetValue(kExposureGizmoPosition, newPosition);
SetValue(kExposureGizmoRadius, newRadius);
ExecuteCommand(kCmdProcessFromColorCorrection);
}
}