/// <inheritdoc />
protected override void touchesBegan(IList <ITouch> touches)
{
base.touchesBegan(touches);
if (State != GestureState.Possible)
{
return;
}
if (touches.Count == NumTouches)
{
projectionLayer = activeTouches[0].Layer;
updateProjectionPlane();
#if DEBUG
drawDebug(projectionLayer.ProjectFrom(cachedTransform.position), activeTouches[0].Position);
#endif
}
}
/// <inheritdoc />
protected override void touchesMoved(IList <ITouch> touches)
{
base.touchesMoved(touches);
var dR = deltaRotation = 0;
var dS = deltaScale = 1f;
#if DEBUG
var worldCenter = cachedTransform.position;
var screenCenter = projectionLayer.ProjectFrom(worldCenter);
var newScreenPos = getPointScreenPosition();
drawDebug(screenCenter, newScreenPos);
#endif
if (touchesNumState != TouchesNumState.InRange)
{
return;
}
var rotationEnabled = (Type & TransformType.Rotation) == TransformType.Rotation;
var scalingEnabled = (Type & TransformType.Scaling) == TransformType.Scaling;
if (!rotationEnabled && !scalingEnabled)
{
return;
}
if (!relevantTouches(touches))
{
return;
}
#if !DEBUG
var theTouch = activeTouches[0];
var worldCenter = cachedTransform.position;
var screenCenter = projectionLayer.ProjectFrom(worldCenter);
var newScreenPos = theTouch.Position;
#endif
// Here we can't reuse last frame screen positions because points 0 and 1 can change.
// For example if the first of 3 fingers is lifted off.
var oldScreenPos = getPointPreviousScreenPosition();
if (rotationEnabled)
{
if (isTransforming)
{
dR = doRotation(worldCenter, oldScreenPos, newScreenPos);
}
else
{
// Find how much we moved perpendicular to the line (center, oldScreenPos)
screenPixelRotationBuffer += TwoD.PointToLineDistance(screenCenter, oldScreenPos, newScreenPos);
angleBuffer += doRotation(worldCenter, oldScreenPos, newScreenPos);
if (screenPixelRotationBuffer * screenPixelRotationBuffer >=
screenTransformPixelThresholdSquared)
{
isTransforming = true;
dR = angleBuffer;
}
}
}
if (scalingEnabled)
{
if (isTransforming)
{
dS *= doScaling(worldCenter, oldScreenPos, newScreenPos);
}
else
{
screenPixelScalingBuffer += (newScreenPos - screenCenter).magnitude -
(oldScreenPos - screenCenter).magnitude;
scaleBuffer *= doScaling(worldCenter, oldScreenPos, newScreenPos);
if (screenPixelScalingBuffer * screenPixelScalingBuffer >=
screenTransformPixelThresholdSquared)
{
isTransforming = true;
dS = scaleBuffer;
}
}
}
if (dR != 0 || dS != 1)
{
if (State == GestureState.Possible)
{
setState(GestureState.Began);
}
switch (State)
{
case GestureState.Began:
case GestureState.Changed:
deltaRotation = dR;
deltaScale = dS;
setState(GestureState.Changed);
break;
}
}
}
