I am creating an image editor and I need to take a snapshot of the controls. But snapshot cannot work in a large resolution so I decided to use BitmapCreator.

The problem I am facing is that if a node is rotated, I cannot accurately draw it in the BitmapCreator.

I know I need to know the exact bounds of the node after rotation. I use the following code to get the rotated rectangle but it is a bit away from the real position. I would like to know the correct way to do this.

My test project is attatched.

B4X:

```
Private Sub Button1_MouseClicked (EventData As MouseEvent)
If CheckBox1.Checked Then
Dim img As Image = Pane1.Snapshot2(fx.Colors.Transparent)
ImageView1.SetImage(img)
Else
Dim bc As BitmapCreator
bc.Initialize(Pane1.Width,Pane1.Height)
Dim r1 As B4XRect
r1.Initialize(Label1.Left,Label1.Top,Label1.Left+Label1.Width,Label1.Top+Label1.Height)
bc.DrawBitmap(Label1.Snapshot2(fx.Colors.Transparent),r1,False)
Dim r2 As B4XRect
r2.Initialize(Label2.Left,Label2.Top,Label2.Left+Label2.Width,Label2.Top+Label2.Height)
Dim rotatedRect As B4XRect = getRotatedRect(315,r2)
bc.DrawBitmap(Label2.Snapshot2(fx.Colors.Transparent),rotatedRect,False)
ImageView1.SetImage(bc.Bitmap)
End If
End Sub
Sub getRotatedRect(degree As Double,r As B4XRect) As B4XRect
Dim Points As List = getRotatedPoints(degree,r)
Dim Point1,Point2,Point3,Point4 As Point2D
Point1=Points.Get(0)
Point2=Points.Get(1)
Point3=Points.Get(2)
Point4=Points.Get(3)
Dim left,top,right,bottom As Double
left=Point1.X
top=Point1.Y
For Each point As Point2D In Array(Point1,Point2,Point3,Point4)
left=Min(point.X,left)
top=Min(point.Y,top)
right=Max(point.X,right)
bottom=Max(point.Y,bottom)
Next
Dim rotatedRect As B4XRect
rotatedRect.Initialize(left,top,right,bottom)
Return rotatedRect
End Sub
private Sub getRotatedPoints(degree As Double,r As B4XRect) As List
Dim center As Point2D
center.Initialize
center.X=r.CenterX
center.Y=r.CenterY
Dim Point1,Point2,Point3,Point4 As Point2D
Point1=CalculateRotatedPosition(degree,center.X,center.Y,r.Left,r.Top)
Point2=CalculateRotatedPosition(degree,center.X,center.Y,r.Left+r.width,r.Top)
Point3=CalculateRotatedPosition(degree,center.X,center.Y,r.Left+r.width,r.Top+r.height)
Point4=CalculateRotatedPosition(degree,center.X,center.Y,r.Left,r.Top+r.height)
Return Array(Point1,Point2,Point3,Point4)
End Sub
private Sub CalculateRotatedPosition(degree As Double,pivotx As Double,pivoty As Double,x As Double,y As Double) As Point2D
Dim rotate As JavaObject
rotate.InitializeNewInstance("javafx.scene.transform.Rotate",Array(degree,pivotx,pivoty))
Dim point2dJO As JavaObject = rotate.RunMethod("transform",Array(x,y))
Dim point As Point2D
point.Initialize
point.X=point2dJO.RunMethod("getX",Null)
point.Y=point2dJO.RunMethod("getY",Null)
Return point
End Sub
```