Leadtools.WinForms Namespace > RasterImageViewer Class : InteractiveUserRectangle Event |
[CategoryAttribute("Interactive Mode")] [DescriptionAttribute("Occurs on interactive mode user rectangle operations.")] public event EventHandler<RasterViewerRectangleEventArgs> InteractiveUserRectangle
'Declaration <CategoryAttribute("Interactive Mode")> <DescriptionAttribute("Occurs on interactive mode user rectangle operations.")> Public Event InteractiveUserRectangle As EventHandler(Of RasterViewerRectangleEventArgs)
'Usage Dim instance As RasterImageViewer Dim handler As EventHandler(Of RasterViewerRectangleEventArgs) AddHandler instance.InteractiveUserRectangle, handler
[CategoryAttribute("Interactive Mode")] [DescriptionAttribute("Occurs on interactive mode user rectangle operations.")] public: event EventHandler<RasterViewerRectangleEventArgs^>^ InteractiveUserRectangle
The event handler receives an argument of type RasterViewerRectangleEventArgs containing data related to this event. The following RasterViewerRectangleEventArgs properties provide information specific to this event.
Property | Description |
---|---|
Cancel (Inherited from Leadtools.WinForms.RasterViewerInteractiveEventArgs) | Gets or sets a value indicating whether the interactive mode should be canceled. |
Rectangle | Returns the current interactive mode rectangle. |
Status (Inherited from Leadtools.WinForms.RasterViewerInteractiveEventArgs) | Gets the current status of the interactive mode. |
Only occur when the InteractiveMode property is set to RasterViewerInteractiveMode.UserRectangle.
Use the RasterViewerInteractiveMode.UserRectangle and InteractiveUserRectangle to draw a rectangle on the surface of the viewer. The RasterImageViewer object will handle mouse cursor down and up events, mouse movement, canceling (through the ESC key or when the control loses the focus) and clipping.
The InteractiveUserRectangle event will occur everytime the user moves the mouse or clicks any of the buttons with the corresponding data in the RasterViewerRectangleEventArgs of the event.
You can use the user-defined rectangle interactive mode to perform additional interactive operations on the viewer not handled by any of the pre-defined RasterViewerInteractiveMode.
You can use the ViewerToImageRectangle and ImageToViewerRectangle methods to convert a rectangle between image and viewer coordinates.
Imports Leadtools.WinForms Imports Leadtools Imports Leadtools.Codecs Imports Leadtools.ImageProcessing.Color Imports Leadtools.Drawing Public Sub InteractiveUserRectangleExample(ByVal viewer As RasterImageViewer) ' Set the interactive mode of the viewer to user-defined rectangle viewer.InteractiveMode = RasterViewerInteractiveMode.UserRectangle ' Subscribe to the InteractiveUserRectangle event to know when the user has finished drawing a new rectangle AddHandler viewer.InteractiveUserRectangle, AddressOf viewer_InteractiveUserRectangle End Sub Private Sub viewer_InteractiveUserRectangle(ByVal sender As Object, ByVal e As RasterViewerRectangleEventArgs) ' Check the status of the event If (e.Status = RasterViewerInteractiveStatus.End AndAlso Not e.Cancel) Then ' The user has finished drawing a new rectangle (and the operation has not been canceled) ' Get the rectangle and convert it to image coordinates (with view-perspective) Dim viewer As RasterImageViewer = CType(sender, RasterImageViewer) Dim rect As Rectangle = e.Rectangle ' The user rectangle might have negative width or height (if the user starts the drawing from ' bottom-left corner for example), check for that If (rect.Left > rect.Right) Then rect = Rectangle.FromLTRB(rect.Right, rect.Top, rect.Left, rect.Bottom) End If If (rect.Top > rect.Bottom) Then rect = Rectangle.FromLTRB(rect.Left, rect.Bottom, rect.Right, rect.Top) End If ' Account for the view perspective of the image rect = viewer.ViewerToImageRectangle(rect, True) ' Set this as the region and invert the colors Dim image As RasterImage = viewer.Image Dim lrect As LeadRect = New LeadRect(rect.Left, rect.Top, rect.Width, rect.Height) image.AddRectangleToRegion(Nothing, lrect, RasterRegionCombineMode.Set) Dim cmd As New InvertCommand() cmd.Run(image) ' Remove the region image.MakeRegionEmpty() End If End Sub
using Leadtools.WinForms; using Leadtools; using Leadtools.Codecs; using Leadtools.ImageProcessing.Color; using Leadtools.Drawing; public void InteractiveUserRectangleExample(RasterImageViewer viewer) { // Set the interactive mode of the viewer to user-defined rectangle viewer.InteractiveMode = RasterViewerInteractiveMode.UserRectangle; // Subscribe to the InteractiveUserRectangle event to know when the user has finished drawing a new rectangle viewer.InteractiveUserRectangle += new EventHandler<RasterViewerRectangleEventArgs>(viewer_InteractiveUserRectangle); } private void viewer_InteractiveUserRectangle(object sender, RasterViewerRectangleEventArgs e) { // Check the status of the event if(e.Status == RasterViewerInteractiveStatus.End && !e.Cancel) { // The user has finished drawing a new rectangle (and the operation has not been canceled) // Get the rectangle and convert it to image coordinates (with view-perspective) RasterImageViewer viewer = sender as RasterImageViewer; Rectangle rect = e.Rectangle; // The user rectangle might have negative width or height (if the user starts the drawing from // bottom-left corner for example), check for that if(rect.Left > rect.Right) rect = Rectangle.FromLTRB(rect.Right, rect.Top, rect.Left, rect.Bottom); if(rect.Top > rect.Bottom) rect = Rectangle.FromLTRB(rect.Left, rect.Bottom, rect.Right, rect.Top); // Account for the view perspective of the image rect = viewer.ViewerToImageRectangle(rect, true); // Set this as the region and invert the colors RasterImage image = viewer.Image; LeadRect ltRect = new LeadRect(rect.Left, rect.Top, rect.Width, rect.Height); image.AddRectangleToRegion(null, ltRect, RasterRegionCombineMode.Set); InvertCommand cmd = new InvertCommand(); cmd.Run(image); // Remove the region image.MakeRegionEmpty(); } }