picturebox

问题 net webdeveloper and usually don't make any win32 apps. but now i have to. i have a list with about 2000 entries. each entry should be displayed as, a label with textbox another label and picture. i have made this with a flowlayoutpanel and i did a foreach on the entries to make a panel for each entry with the label, textbox, label and a picturebox. now i have rendering issues when it comes above 1000 entries. so i have read that i should use a listview or datagridview. now i have a

问题 I have some picture boxes on Visual Basic Express 2010, and these picture have alpha channels on them, but when the background color is set to transparent, it does not become transparent but becomes the color of the form. I still can't see anything else through the alpha map. What is the problem? I don't only want to see the parent object behind the picture box, but every other object that is underneath it. 回答1: I have got some code that will create "proper" transparency for a control by

问题 I have a custom PictureBox which can zoom in using MouseWheel event. Now I want to add a panning feature to it. I mean when PictureBox is in zoomed state, if user left clicks and holds the click then move the mouse, the image would pan within the picturebox. Here is my code but unfortunately it does not work! I don't know where to look anymore... private Point _panStartingPoint = Point.Empty; private bool _panIsActive; private void CurveBox_MouseDown(object sender, MouseEventArgs e) { if (e

问题 I am using this to get image bytes from the database cmd.CommandText = "select imagedate from projectimages where imagename = '" + _ ListBox1.Text + "' and CSVprojectref=checksum('" + textboxFileRef.Text + "')" Dim img As Object = cmd.ExecuteScalar() Now how can I add this to PictureBox.image. I am having a lot of trouble retrieving the image and displaying it in the PictureBox. The datatype is Image in sql database and i use this code to save image to db Dim ms As New IO.MemoryStream If

问题 I've seen few questions about this problem, I tried every solution but none of them worked for my case. My code is working; this image shows what happens when I click on Draw button. I need to zoom on that drawing.Is it possible to code something like autocad feature "zoom/extent"? Pen myPen = new Pen(Color.Black); int centerpointx, centerpointy; private void pictureBoxDraw_Paint(object sender, PaintEventArgs e) { centerpointx = pictureBoxDraw.Size.Width/2; centerpointy = pictureBoxDraw.Size

问题 I've seen few questions about this problem, I tried every solution but none of them worked for my case. My code is working; this image shows what happens when I click on Draw button. I need to zoom on that drawing.Is it possible to code something like autocad feature "zoom/extent"? Pen myPen = new Pen(Color.Black); int centerpointx, centerpointy; private void pictureBoxDraw_Paint(object sender, PaintEventArgs e) { centerpointx = pictureBoxDraw.Size.Width/2; centerpointy = pictureBoxDraw.Size

问题 When you load an image into a PictureBox there is a zoom for the image placement, how do I achieve that same effect with a graphics object? 回答1: I think you mean you want to draw some Image yourself in a Rectangle and using some Graphics object like as the PictureBox renders its Image in Zoom mode. Try the following code. I suppose you want to draw the Image on a Form, the drawing code should be added in a Paint event handler of your form: //The Rectangle (corresponds to the PictureBox

问题 I have a picture box that will be showing an image. I want the user to be able to click, drag, and mouse up to a rectangle on the image. Like "I want to do something using this rectangle I drew here on this picture". If they click again, I want the previous rectangle to disappear and they start over or when I click a button to clear the highlighting rectangle they drew. So I did find some good starting code from the msdn example about creating a zoom in rubber band rectangle that I edited a

问题 In a form in winform application i have to show images (multiple images) stored on webserver. There is no problem in showing images as i can simple assign URL to picturebox. picturebox1.ImageLocation = "http://example.com/Image.jpg"; That form will be opened many times frequently, right now each time form is opened, images are being downloaded every time. It is unnecessary increasing traffic. Is it possible to tell picturebox to cache image (as Browser do), so next time same images is

问题 I'm currently writing a little paint application where the user is able to draw on a Panel. I am working on the select tool and want to be able to select a certain area of the Panel, and then paste this selected area directly into a PictureBox that I have just to the right of the Panel. My problem is that my code at the moment is not working correctly, when I try to paste the Bitmap that I am creating from the panel I am getting a big red X in the PictureBox instead of the actual image. I