I am using this code to draw a line on a form using textboxes as the x and y coordinates. I then click the button with the code below that will draw the line.
Before the new line is drawn, I would like to have previous lines deleted first.
How can I delete these lines?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim canvas As New ShapeContainer
[Code].....
I need to draw several line-graphics on a form, then select and drag individual graphics to new locations. Is it possible for example to give each graphic path an identity when drawn, then select any one (via mousedown, whatever) and link it to the dragged mouse co-ordinates until released? MS Visio has exactly this ability - can it be done in .NET?
View 4 RepliesIs it possible that when a new line (anywhere in a richtextbox) is added/deleted, then a line is also added/deleted in another richtextbox?
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You would think a search for this would show some results but I have had no luck.If I want to delete a line by a line number from a text file, how do I do that?
View 6 Replieshow to delete a richtextbox line, if the line only has one value. Ex:
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I want to draw lines (paths) for AI to follow. I need to know the X,Y coordinates of each pixel in the line.Lines drawn straight vertical (0 or 180 Degs), diagonal (45 or 225 Degs), or horizontal (90 or 270 Degs) are easy to map.I need to know how to map straight lines that are not one of the those three. Like 1 degree to 44 degrees, 46 degrees to 89 degrees, and so on...
View 1 RepliesI'm creating a type of drawing program. The user can draw a line, much like in word or paint, etc. But once the line is drawn (to a picturebox or bitmap in memory), I want the user to be able to click on the line and drag it around (translate it).
If I know the coordinates of the endpoints of the line, as well as the pen width it was drawn with, how can I tell if a certain coordinate (mouse location) is contained by the line?
My first thought was to take a mathematical approach, like get an equation for a line, and check to see if the coordinate belonged to it. But for a higher pen width, the line is thicker, and thus contains more points.
How can I tell what coordinates are part of the line? Is there some sort of intersect function in the gdi that takes a line?
Currently I have not found a way to generate an event when a user clicks on a line that is drawn in my workspace area. The line that is drawn is created by calling the function e.Graphics.Drawline(Connector,X1,Y1,X2,Y2), where Connector is a System.Drawing.Pen object and X1,Y1,X2,Y2 are integer coordinates of the two points to draw the line between. I have not found any events such as Click that are associated with the line that I can use. Do I need to create a custom event for these lines if so how do I go about this?
View 5 RepliesI have drawn (3) lines on a panel, each a diff color. I want user to muse click on a given line to bring up a label that will explane what the line is telling the user. There s/b no bit maps involved. I am using graphics to draw the panels and lines.
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
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My code above will draw the line but i can not see how to use path to get a "hit" on mouse move for the line?I use private routines to draw many panels and assign pens to colors and panels. I must be able to connect panel and line ID to pen name to know the nature of the line to label it! I can see that path must be used; but how?
i am having trouble deleting the individual rows in the datagrid. That is when the user select this row only this row will be deleted. i am getting some errors at the dataset there. the below is my code to delete from the database:
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Does anyone know how to create a custom start and end cap for a line drawn with System.Drawing.Pen? I wanted to use a custom start and end cap that I have from an image that I created that contains two arrows pointing in the same direction one after the other.[code]...
View 1 Replieswhat i need to do is open a txt file, read line by line, decode each line into an array and display. Now all works ok apart from one line.
sTextLine = objReader.ReadLine() <-- Value of string cannot be converted.
full code here
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Dim objReader As New System.IO.StreamReader(sOpenFile.Text)
Dim sTextLine As New ArrayList()
Dim sText As String = ""
Dim i As Integer = 0
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how to read text from a listbox line by line and put current line in a label?
View 3 RepliesHow would i go about reading a file Line by Line that within that line The values are delimited by " Example of the data:
"bob" "cat" "1243"
"steve" dog" "6789"
I've started this with this code but not sure how to go about the next stage:
Using MyReader As New _
Microsoft.VisualBasic.FileIO.TextFieldParser(My.Application.Info.DirectoryPath & "Records28112011.jd")
MyReader.TextFieldType = FileIO.FieldType.Delimited
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I am trying to read in a TextBox line by line and take the first 7 characters of each line and output everything in another TextBox.This is what I have so far.
Dim line, lines() As String
lines = TextBox1.Text.Split(Environment.NewLine)
Dim i As Integer = 0
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i need the app to preview the line in textbox in timeintervalof 1 s (can be change)nd when it will reach to the end it close the text file and andreread it after let say 1 m ..
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim myStream As Stream = Nothing
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I have lines like this in my text file
10.0 28 Blue (B1-T54 ) [1 01.69 65.4] 47234 -22234 181017 76921
6.5 28 Blue (B1-T55 ) [1 01.80 50.2] 48234 -21234 203852 76133
11.0 28 Blue (B1-T56 ) [1 01.80 64.9] 48234 -22234 181804 76133
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I've been search and I can't found an answer that works, I need to remove (delete) the last line in a RichTextBox1 in vb .net, I mean remove last line and 'breakline' too, but only the last, no others,
View 1 Replieshow can i delete line 1 from listbox?
View 13 Repliesok i have a textbox that look's like this [code]say my code grab's the word EON & ERN & HEN and send's it to 1 of my textbox's/i need those deleted so they cant be sent again to my textbox.[code]
View 3 RepliesI am trying to figure out a way to delete something inside a text file but keep everything around it.[code]....
View 4 RepliesI'm making a function that is supposed to delete a line from a textfile "test.txt". I'm having no problems with finding what line i want to delete. The basic idea is this: read the whole file with streamreaderdelete the linerewrite the file with streamwriter. My problem is the last, how can i completely remove the file content, and write another string in it, writer.writeline just appends a line.
View 2 RepliesHere is an example of a line:
H e l l o t h e r e !
I want to delete every other character so that it looks like this:
Hello there!
I have a program that reads a text file tab delimted using OLEDb I need to be able to allow the user to insert a user created record into the file which I can do. The problem is I need to be able to let the user edit that record. From my understanding you can not edit or delete with OLEDB only insert So I thought I would read the file using stream reader, find the line I want to edit and just delete it, rewrite the file, then let the user insert a new record?
Dim strDelimiter As String = vbTab
OpenFileDialog1.InitialDirectory = "C:\"
OpenFileDialog1.Filter = "Text Files (*.txt)|*.txt"
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Is there a way to delete the final line of a DataTable? I use - DataTable.Rows.Remove()But how can I find out which is the final line in the DataTable
View 18 Replieshow can i delete the first 6 letters from a line in any TextBox?
View 39 RepliesI have a RichTextBox.
I want to input an integer and the RichTextBox to go to that line and delete all lines above it.
For example, if I have 100 lines in the RTB, and I specify "25" as the integer, I want lines 1-25 deleted and for the RTB to keep 26-100.
i have a listbox that lists the contents of a .txt file, How can i make it so that when i click a button it will delete the selected line from the listbox from the file?
View 3 RepliesI am a beginner at this and I am taking classes, however I am having trouble deleting a line from a Comma Delimited .txt file.[code]...
View 8 RepliesI am working on a program with a list box that displays text from a selected text file. I have already made it to delete the item from the listbox but I don't know how to get it to delete that same line from the text file so it doesn't just display it again when you reopen the dialog. Any help? I am using streamwriter and streamreader.
View 2 Replies