RubberBand.py 文件源码

def DrawBoundingBoxes(self, bboxes, dc=None):
        """
        Draw a list of bounding box on Viewer in the order given using XOR
        logical function
        @param bboxes: List of bounding boxes to draw on viewer
        @param dc: Device Context of Viewer (default None)
        """
        # Get viewer Device Context if not given
        if dc is None:
            dc = self.Viewer.GetLogicalDC()

        # Save current viewer scale factors before resetting them in order to
        # avoid rubberband pen to be scaled
        scalex, scaley = dc.GetUserScale()
        dc.SetUserScale(1, 1)

        # Set DC drawing style
        dc.SetPen(wx.Pen(wx.WHITE, style=wx.DOT))
        dc.SetBrush(wx.TRANSPARENT_BRUSH)
        dc.SetLogicalFunction(wx.XOR)

        # Draw the bounding boxes using viewer scale factor
        for bbox in bboxes:
            if bbox is not None:
                dc.DrawRectangle(
                    bbox.x * scalex, bbox.y * scaley,
                    bbox.width * scalex, bbox.height * scaley)

        dc.SetLogicalFunction(wx.COPY)

        # Restore Viewer scale factor
        dc.SetUserScale(scalex, scaley)