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;
}
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 />
private 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;
}
/// <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;
}
/// <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;
}
/// <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;
}