// Registers a Virtual Button at native code. This method is called
// implicitly by the ImageTargetBehaviour.CreateVirtualButton method. This
// method should not be called by user code.
public bool RegisterVirtualButton(VirtualButtonBehaviour vb,
string imageTargetName)
{
TrackerBehaviour.RectangleData rectData =
new TrackerBehaviour.RectangleData();
Vector2 leftTop, rightBottom;
vb.CalculateButtonArea(out leftTop, out rightBottom);
rectData.leftTopX = leftTop.x;
rectData.leftTopY = leftTop.y;
rectData.rightBottomX = rightBottom.x;
rectData.rightBottomY = rightBottom.y;
IntPtr rectPtr = Marshal.AllocHGlobal(
Marshal.SizeOf(typeof(TrackerBehaviour.RectangleData)));
Marshal.StructureToPtr(rectData, rectPtr, false);
bool registerWorked =
(createVirtualButton(imageTargetName, vb.VirtualButtonName,
rectPtr) != 0);
if (registerWorked)
{
int id = virtualButtonGetId(imageTargetName, vb.VirtualButtonName);
// Initialize the id of the button:
vb.InitializeID(id);
// Check we don't have an entry for this id:
if (!mVBBehaviourDict.ContainsKey(id))
{
// Add:
mVBBehaviourDict.Add(id, vb);
mVBDataArrayDirty = true;
}
}
return registerWorked;
}
public void LateUpdate()
{
// Update the button pose:
if (UpdatePose())
{
// Area has changed, update the QCAR trackable:
string trackableName = this.GetImageTarget().TrackableName;
TrackerBehaviour.RectangleData rectData =
new TrackerBehaviour.RectangleData();
rectData.leftTopX = mLeftTop.x;
rectData.leftTopY = mLeftTop.y;
rectData.rightBottomX = mRightBottom.x;
rectData.rightBottomY = mRightBottom.y;
IntPtr rectPtr = Marshal.AllocHGlobal(Marshal.SizeOf(
typeof(TrackerBehaviour.RectangleData)));
Marshal.StructureToPtr(rectData, rectPtr, false);
virtualButtonSetAreaRectangle(trackableName, this.VirtualButtonName,
rectPtr);
Marshal.FreeHGlobal(rectPtr);
}
// Update the sensitivity of the button if it has changed since the
// last update:
if (mSensitivityDirty)
{
ImageTargetBehaviour itb = this.GetImageTarget();
if (virtualButtonSetSensitivity(itb.TrackableName,
this.VirtualButtonName,
(int)mSensitivity) == 0)
{
Debug.LogError("Virtual Button sensitivity could not be set.");
}
else
{
mSensitivityDirty = false;
}
}
}