private float doScaling(Vector3 center, Vector2 oldScreenPos, Vector2 newScreenPos,
ProjectionParams projectionParams)
{
var newVector = projectionParams.ProjectTo(newScreenPos, TransformPlane) - center;
var oldVector = projectionParams.ProjectTo(oldScreenPos, TransformPlane) - center;
return(newVector.magnitude / oldVector.magnitude);
}
/// <inheritdoc />
protected override float doScaling(Vector2 oldScreenPos1, Vector2 oldScreenPos2, Vector2 newScreenPos1,
Vector2 newScreenPos2, ProjectionParams projectionParams)
{
var newVector = projectionParams.ProjectTo(newScreenPos2, TransformPlane) -
projectionParams.ProjectTo(newScreenPos1, TransformPlane);
var oldVector = projectionParams.ProjectTo(oldScreenPos2, TransformPlane) -
projectionParams.ProjectTo(oldScreenPos1, TransformPlane);
return(newVector.magnitude / oldVector.magnitude);
}
private float doRotation(Vector3 center, Vector2 oldScreenPos, Vector2 newScreenPos,
ProjectionParams projectionParams)
{
var newVector = projectionParams.ProjectTo(newScreenPos, TransformPlane) - center;
var oldVector = projectionParams.ProjectTo(oldScreenPos, TransformPlane) - center;
var angle = Vector3.Angle(oldVector, newVector);
if (Vector3.Dot(Vector3.Cross(oldVector, newVector), TransformPlane.normal) < 0)
{
angle = -angle;
}
return(angle);
}
/// <inheritdoc />
protected override float doRotation(Vector2 oldScreenPos1, Vector2 oldScreenPos2, Vector2 newScreenPos1,
Vector2 newScreenPos2, ProjectionParams projectionParams)
{
var newVector = projectionParams.ProjectTo(newScreenPos2, TransformPlane) -
projectionParams.ProjectTo(newScreenPos1, TransformPlane);
var oldVector = projectionParams.ProjectTo(oldScreenPos2, TransformPlane) -
projectionParams.ProjectTo(oldScreenPos1, TransformPlane);
var angle = Vector3.Angle(oldVector, newVector);
if (Vector3.Dot(Vector3.Cross(oldVector, newVector), TransformPlane.normal) < 0)
{
angle = -angle;
}
return(angle);
}
/// <inheritdoc />
protected override Vector3 doTwoPointTranslation(Vector2 oldScreenPos1, Vector2 oldScreenPos2,
Vector2 newScreenPos1, Vector2 newScreenPos2, float dR, float dS, ProjectionParams projectionParams)
{
if (isTransforming)
{
return(projectionParams.ProjectTo(newScreenPos1, TransformPlane) - projectScaledRotated(oldScreenPos1, dR, dS, projectionParams));
}
screenPixelTranslationBuffer += newScreenPos1 - oldScreenPos1;
if (screenPixelTranslationBuffer.sqrMagnitude > screenTransformPixelThresholdSquared)
{
isTransforming = true;
return(projectionParams.ProjectTo(newScreenPos1, TransformPlane) -
projectScaledRotated(newScreenPos1 - screenPixelTranslationBuffer, dR, dS, projectionParams));
}
return(Vector3.zero);
}
/// <inheritdoc />
protected override Vector3 doOnePointTranslation(Vector2 oldScreenPos, Vector2 newScreenPos,
ProjectionParams projectionParams)
{
if (isTransforming)
{
return(projectionParams.ProjectTo(newScreenPos, TransformPlane) -
projectionParams.ProjectTo(oldScreenPos, TransformPlane));
}
screenPixelTranslationBuffer += newScreenPos - oldScreenPos;
if (screenPixelTranslationBuffer.sqrMagnitude > screenTransformPixelThresholdSquared)
{
isTransforming = true;
return(projectionParams.ProjectTo(newScreenPos, TransformPlane) -
projectionParams.ProjectTo(newScreenPos - screenPixelTranslationBuffer, TransformPlane));
}
return(Vector3.zero);
}
// Pointers pressed this frame
protected override void pointersPressed(IList <Pointer> pointers)
{
if (State == GestureState.Idle)
{
primaryPointer = pointers[0];
projection = primaryPointer.GetPressData().Layer.GetProjectionParams(primaryPointer);
plane = new Plane(Vector3.up, transform.position);
startPosition = projection.ProjectTo(primaryPointer.Position, plane);
// Start the gesture
setState(GestureState.Began);
}
}
protected Vector3 projectScaledRotated(Vector2 point, float dR, float dS, ProjectionParams projectionParams)
{
var delta = projectionParams.ProjectTo(point, transformPlane) - cachedTransform.position;
if (dR != 0)
{
delta = Quaternion.AngleAxis(dR, RotationAxis) * delta;
}
if (dS != 0)
{
delta = delta * dS;
}
return(cachedTransform.position + delta);
}