private void CreateVirtualButtons(ImageTargetBehaviour itb)
{
// Allocate array for all Image Targets.
int numVirtualButtons = imageTargetGetNumVirtualButtons(mDataSetPtr, itb.TrackableName);
IntPtr virtualButtonDataPtr =
Marshal.AllocHGlobal(Marshal.SizeOf(typeof(QCARManager.VirtualButtonData)) * numVirtualButtons);
IntPtr rectangleDataPtr =
Marshal.AllocHGlobal(Marshal.SizeOf(typeof(VirtualButtonBehaviour.RectangleData)) * numVirtualButtons);
// Copy Virtual Button data from native.
imageTargetGetVirtualButtons(virtualButtonDataPtr,
rectangleDataPtr,
numVirtualButtons,
mDataSetPtr,
itb.TrackableName);
for (int i = 0; i < numVirtualButtons; ++i)
{
IntPtr vbPtr = new IntPtr(virtualButtonDataPtr.ToInt32() + i *
Marshal.SizeOf(typeof(QCARManager.VirtualButtonData)));
QCARManager.VirtualButtonData vbData = (QCARManager.VirtualButtonData)
Marshal.PtrToStructure(vbPtr, typeof(QCARManager.VirtualButtonData));
// Do not overwrite existing Virtual Buttons.
if (mVBBehaviourDict.ContainsKey(vbData.id))
{
continue;
}
IntPtr rectPtr = new IntPtr(rectangleDataPtr.ToInt32() + i *
Marshal.SizeOf(typeof(VirtualButtonBehaviour.RectangleData)));
VirtualButtonBehaviour.RectangleData rectData = (VirtualButtonBehaviour.RectangleData)
Marshal.PtrToStructure(rectPtr, typeof(VirtualButtonBehaviour.RectangleData));
// QCAR support names up to 64 characters in length, but here we allocate
// a slightly larger buffer:
int nameLength = 128;
System.Text.StringBuilder vbName = new System.Text.StringBuilder(nameLength);
if (imageTargetGetVirtualButtonName(mDataSetPtr, itb.TrackableName,
i, vbName, nameLength) == 0)
{
Debug.LogError("Failed to get virtual button name.");
continue;
}
VirtualButtonBehaviour vbb = CreateVirtualButton(
vbData.id, vbName.ToString(),
new Vector2(rectData.leftTopX, rectData.leftTopY),
new Vector2(rectData.rightBottomX, rectData.rightBottomY),
itb);
mVBBehaviourDict.Add(vbData.id, vbb);
}
Marshal.FreeHGlobal(virtualButtonDataPtr);
Marshal.FreeHGlobal(rectangleDataPtr);
}
// Update Virtual Button states.
public void UpdateVirtualButtons(int numVirtualButtons, IntPtr virtualButtonPtr)
{
for (int i = 0; i < numVirtualButtons; i++)
{
IntPtr vbPtr = new IntPtr(virtualButtonPtr.ToInt32() + i *
Marshal.SizeOf(typeof(QCARManager.VirtualButtonData)));
QCARManager.VirtualButtonData vbData = (QCARManager.VirtualButtonData)
Marshal.PtrToStructure(vbPtr, typeof(QCARManager.VirtualButtonData));
VirtualButtonBehaviour vb = null;
if (mActiveDataSet.TryGetVirtualButtonByID(vbData.id, out vb))
{
ImageTargetBehaviour it = vb.GetImageTarget();
if (it != null && it.enabled && vb.enabled)
{
vb.OnTrackerUpdated(vbData.isPressed > 0);
}
}
}
}
