Drawline Method Redrawing The Previous Line?
Nov 10, 2011
Hi, I'm using the Drawline method by capturing coordinates entered into 4 textboxes and then printing the image onto a picturebox. However, I can't get the previous line to be redrawn along with the new line that needs to be drawn. I understand that it refreshes when using the picturebox.refresh() function.
The code is:Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]...
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Nov 22, 2010
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...
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Jun 6, 2010
i am using while loop. i need to check whether the previous line is equal to next line ...
Try
Dim r As Integer
r = str.IndexOf("action = LGN; description = Success")--- i need to check next line also same content[code].....
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Aug 6, 2008
I am Reading a Text File using Stream Reader. I am Reading line by line . At one point of time , If I want to go back and Read the Previous line,, Is there any method to implement that.. I have tried calling to function ( whose argument is Line number) which opens the same text File , and read upto theline number , but it does n't work as expected ,
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Feb 18, 2011
I have to generate an XML file from several database tables. I could use the WriteXml method of the DataSet to do it, but the database tables are really huge and I can't add all those tables in the DataSet at the same time or it may cause a problem because of the big amount of memory used. Then I decided to use the DataTable's WriteXml method and save table after table, but the the generated file only stores the information of the last DataTable.WriteXml's call. How can I preserve the previous XML data when adding all that information?
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Jul 16, 2011
In Datagridview, Set as DatagridView1.ReadOnly=True,
Dgv1.Rows.Add()
When i tried to add a Row, it is copying previous Row data to new row,and also blank the previous row, why?Like Insert Row, Why...?
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Apr 19, 2011
In a simple hang man game I am I have a a method called wrong(). In this method I increase an integer variable (wrongGuesses) by one and Panel1 is refreshed. Panel1 is the control that I am drawing the actual hangman on and in its paint event I'm using a Select Case structure to draw each part. Here is my code for the wrong() method and the Panel1 paint event.
The problem I'm having is that every time Panel1 is refreshed everything is erased and and the paint event only draws a single part (head, body, left arm, etc). I realize I could redraw the entire stick man every time, but that seems inefficient. Also, I realize that I could Invalidate() each part of the stick man and then Update(), but that I was hoping for a simpler method.
[Code]...
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Dec 17, 2010
I am using the printform object from the powerpack, I have a form that I want to print and take up the whole page when it is printed. To do this i have to resize the form and then print it.. then take it back to the orginal size.
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Apr 2, 2012
I have a Panel within a TabPage, which draws an arc depending on three fields that the user fills in. I've managed to get this to draw and animate correctly. However, when I switch tabs (I have 3 tabs), or sometimes alt + tab out of the program to look at the API, the Panel (with the drawn arc) clears.
Is there any way to redraw the graphics within the panel? I've tried creating a handler to draw graphics whenever a 'Panel1.Paint' event is triggered, but I'm relatively new to VB and its graphical nuances.
However, when I switch back to the panel, it has a red cross through the whole Panel and nothing is drawn, unless of course I press the button again which causes the graphics to redraw but the red cross persists.
Here's the code relevant to the reloading:
Private Sub Panel1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Panel1.Paint
If (draw) Then
Dim mySolidPen As Pen = New Pen(Color.Black, 10)
[code]....
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Jan 15, 2012
i am want to draw lines on a picture for my project.Apart from the PictureBox1.Refresh() function, i wanted to know which other functions can be applied to a PictureBox.Moreover, I am trying to draw a line from a point to another several times on the same picture.I am actually using the PictureBox1.Refresh() that is not effective in my case when I want all the lines I draw to remain on that same picture. Currently, when I am trying to draw another line, the first one is cleared and the new one only is shown.
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Dec 13, 2011
I just want to draw some lines between the rectangles in vb.net. I used g.drawstring() method to that.
But now, based on a value I just want to change the opacity of the arrow.
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Oct 12, 2011
I support a program that captures a drawings from a digitizer tablet. The tablet functions as sort of a mouse and the user uses a Stylus to draw (sign) their name into documents. An issue that has come up is that the user signs their name but the line that the signature is build with has noticable holes in it. Kind of like having a pen that skips when you write. The information is communicated into a PictureBox using a DrawLine Function where it passes the line color, the previous point and the current point.Kind of stuck with this, not sure why the tablet would produce a spotty signature when the stylus is in contact the whole time with the tablet. I have yet to port out the line x,y points to see if the tablet is producing consistent points but this is the next step.
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Jan 2, 2011
I'm a beginner to VB2010. If I draw a red line on a BLANK form, obviously its red. But if I draw a second red line, which crosses the first, is there a way of controlling the colour at the crossover position, for example returning it to the original colour of the form?
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Apr 8, 2012
how to remove a line?I have:
Dim PenColor As New Pen(Color.Black) and after I received the values I draw the line with:
objGraphics.DrawLine(PenColor, Xstart, Ystart, Xend, Yend)
The user can do this 10 times... (so 10 lines)...But if the user presses a cancel button, the last line drawn shall be removed (and the user can click until he is back at 0)..Would I use PenColor white here (to draw over the line)? Or is there a way to remove line directly in visual basic? I couldn't find it.
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Sep 28, 2009
I have a AxAcroPDF on a from which i added from the toolbox I can draw on the form using this code
Private m_Drawing As Boolean = False
Private m_LastPoint As Point = Nothing
' Start drawing.
[Code]....
Is it possible to draw directly onto the AxAcroPDF Control?
The AxAcroPDF Control dosnt have the mouseup and mouse down declatations so i am unable to easily adapt the code.
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Apr 28, 2011
So far, I have always run applications within the IDE, using Debug Mode.If I publish an application will I have to add code to repaint Picture Box graphics?In the IDE, my Picture Box graphics never get disturbed by running some other application or minimizing my forms.
I have noticed some discussions which suggest that code is needed in the Paint Event Handler in order to redraw graphics which disappear due to minimizing the form or running another application which displays a window covering my application.
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Jul 30, 2008
Redrawing rectangles on a Form? I have a problem repainting my form, I'm creating a "Bouncing block" Type of game , the Ball as a PicturBox, the Bar as A Picture Box And the Breakable "Targets" as An Array of Rectangles created in my forms Paint event using "e.Graphics.FillRectangles(Brush, rectsF)". It Looks a little like this:
Top of my Form(in the MainForm class):
Dim Brush As New SolidBrush(Color.Red)
Dim rectsF() As Rectangle
[Code].....
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Mar 17, 2009
I'm drawing my own charts based on values from a db. I'm drawing "directly" on the forms, so to speak. The thing is everytime the application is deactivated or if someting comes in front of the charts, the drawing dissappears. For instance, I have a contextmenu in one chart and whenever I use it there is a "hole" in the chart afterwards where the menu has been. Now I can see the reason for it, but how do I get around it?
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Dec 19, 2008
I've been looking through the FCL for a method that will allow me to erase a line of text from a text file and replace it with another line of text. Neither the StreamReader nor StreamWriter have a method for replacing or removing Text from a text file, as does the string object. Are there any available methods for erasing just certain lines of text from a file, and then replacing them with others?
In my code, I'd like to locate a certain line in the text file, and then at that point in the text file, use a For...Next Loop to replace each successive line of the text file with new text:
Dim user_data_file As String = "user_data.txt"
edit_input = New StreamReader(user_data_file)
Dim edit_line As String = edit_input.ReadLine
[CODE]...
However, I can't find any methods that will allow me to do this.
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Nov 4, 2011
I am trying to draw a bus route as a simple sequence of lines. Nothing fancy. But instead of lines, I'm getting wedges. Initially I was fine with this, because the wedges sortof look like arrows and always face towards the second point. But now I want to improve the look, and the wedges are becoming a big problem.
My suspicion is some sort of floating-point issue due to the graphics transform (lat/lons are fed in and the transform turns them into x/y on the bitmap [assuming lat/lon is euclidean is accurate enough for my purposes], so the scaling is several orders of magnitude).
Screenshot:
It actually kind of looks like the line was split into two triangles but only one of them was drawn.
Relevant Code (note: drawing is done asynchronously, which is why I'm creating a bitmap):
'-- Creating the transform --'
Dim bitmap = New Bitmap(Math.Max(1, PictureBox1.Width), Math.Max(1, PictureBox1.Height))
Dim g = Graphics.FromImage(bitmap)
[Code].....
Using DrawLines instead of DrawLine solves the issue (but why?) Increasing the pen thickness makes the issue go away (but the lines are too thick) Zooming out (increasing lat/lon view window) makes the issue go away, eventually (but I want to zoom in!)
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Jul 15, 2011
I've been searching for a while on an answer to this problem. I have a datagridview in my vb.net app and the right most column holds multiline cells. The vertical scroll bar doesn't redraw correctly:
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Oct 17, 2008
I'm working with adding some user-friendly options to a program that I've developed. A lot of these require handling painting the control myself. So far this hasn't been an issue except for this case.In a context menu, I have a text box that a user can type into. However, the context menu doesn't seem to let me input a label next to it so that the user knows what the text box is for. So, I wanted to paint the text box myself but I can't get the routine to work.I have tried to put the following code in the paint event for both the context menu and the text box itself. In the paint method for the context menu, the string and the text box show up at the top of the menu. Not 3 items down like it should. Also, I don't think the end result is truly a text box.[code]I believe that txtRect is set to the rectangle for the context menu and not for the text box itself. If you run this code, "Filter By:" should show up at the top of the context menu.
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Aug 18, 2011
(New clsViewIllus).View(MyIBaseView, enumViewSolveTypes.View, Me, , True)
... in VB? Basically too lazy to do this:
Dim vi As New clsViewIllus
vi.View(MyIBaseView, enumViewSolveTypes.View, Me, , True)
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Jul 7, 2011
I'm sure I've seen this done in 4.0 but can't remember how it is done.
Basically I want to instantiate a class and call a method of that class on the same line of code.
So something like this
Dim s as String = new myClass().getTestString()
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Apr 19, 2009
I'm totally baffled why my next line of code is not being read after I use the .SubString method.
First, I read a webpage using WebBrowser.DocumentText
Dim TextString As String = WebBrowser2.DocumentText 'Converts page to html text
Second, I search for the string "Price"
[Code]...
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Oct 13, 2008
Is there any way to have 2d graphics that gets made by user through manual dimensions input be bound to a text box?
Is there any way to take position 1000,600 and make that zero? Can we make graphics by inputting only the next co-ordinate and have the pc automatically draw a line from last point?
Also, whats the difference between drawline and draw path? How can I get the shape to remain on screen when I toggle between pages?
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Dec 14, 2010
I have an application where I read a text file into a richtextbox and I am searching for an especific string then I should get the line number where the string is located, but I am getting a wrong result. Got to be something with my code and I can't findwhat's wrong.
Dim Index, Line, MaxLine As Integer
Dim FileText As New RichTextBox
'
[code].....
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Jun 29, 2010
I have a text file (CSV) approx 100k lines (8Mb). I want to search the entire file for a particular string eg, "apple" and for all lines containing the string to be printed in a text box. have successfully done this using streamReader to parse the CSV and check each element against the search word eg. apple. This has proven to be very very slow and I have read that the "ReadAllLines" method is much faster.
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Sep 3, 2009
After running into much difficulty getting started on my little planner attachment, I found this C# program (calendar_src) floating around on the net...somewhere. So I have been working on trying to convert this from C# to VB, which I have been using an online converter. From what I know I have been going through and trying to edit the code after it has been converted to VB code as best as I can. But now I have limited the errors from over 50 to these:
Error1Overload resolution failed because no accessible 'DrawLine' can be called without a narrowing conversion:
'Public Sub DrawLine(pen As System.Drawing.Pen, x1 As Integer, y1 As Integer, x2 As Integer, y2 As Integer)': Argument matching parameter 'y1' narrows from 'Double' to 'Integer'.
[code].....
Not only this, the VB main Form1 isn't showing the "DayView1" control that the C# one is. When I first created the VB app, I didn't know how to make 2 projects in 1, so it's probably wrong altogether...but I tried. The only reasons I am wanting to go off of someone else's control is because it only lacks 1 feature that I want, and that's having a full month view, not just limited to 1-3-5-7 day views.
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Oct 19, 2010
Consider a MyForm class that contains a shadowed implementation of Show(). It also contains a CreateForm() method, which accepts an instance of the form and calls the shadowed sub:
[Code]....
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