/// <summary>
/// Called by Unity engine when the player is dragging mouse
/// </summary>
void IDragHandler.OnDrag(PointerEventData eventData)
{
switch (eventData.button)
{
// If Left mouse button, look for new points
case PointerEventData.InputButton.Left:
{
// Determine active Track Segment
TrackSegment currentTrack = _track.Last();
// Convert position from Screen Coordinates into World ones
Vector2 newPosition = eventData.position.ScreenToWorld();
// Update Line Renderer preview accordingly
currentTrack.SetCurrentPoint(newPosition);
// Check min distance has been passed
Vector2 lastTrackPoint = currentTrack.LastPoint;
float currentDistance = (lastTrackPoint - newPosition).magnitude;
if (currentDistance < MinDistance)
{
return;
}
// Boost first point assignment (it cannot snap due to angle comparison)
if (currentTrack.PointCount <= 1)
{
currentDistance *= 3f;
}
// Check if max distance has been passed..
if (currentDistance > MaxDistance)
{
// ..create a new point
currentTrack.AddPoint(newPosition);
return;
}
// Check angle is over min threshold..
if (currentTrack.PointCount <= 1)
{
return;
}
Vector2 currentDirection = newPosition - lastTrackPoint;
Vector2 previousDirection = lastTrackPoint - currentTrack[currentTrack.PointCount - 2];
float currentAngle = currentDirection.GetZAngle();
float previousAngle = previousDirection.GetZAngle();
if (Mathf.Abs(Mathf.DeltaAngle(previousAngle, currentAngle)) > MaxAngleDifference)
{
// ..create a new point
currentTrack.AddPoint(newPosition);
}
break;
}
// If right button is pressed, drag camera
case PointerEventData.InputButton.Right:
{
// Convert new and previous positions from Screen Coordinates into World ones
Vector2 currentPosition = eventData.position.ScreenToWorld();
Vector2 previousPosition = (eventData.position - eventData.delta).ScreenToWorld();
// Drag camera based in their World-space distance
Vector3 distance = currentPosition - previousPosition;
Camera.main.transform.position -= distance;
break;
}
}
}
