Drawing Multiple Lines On A Canvas?
Jun 29, 2012
So I built myself a simple program to work out the kinks of drawing in my programs. I have a button that I press that when the textbox.text reads 1 it then draws a line of a specific height, color and position, the problem is when I click that button again it will crash informing me that...
"Specified Visual is already a child of another Visual or the root of a CompositionTarget."
[code..]
I know where the problem lies, its with the Canvas1.children.add(line), cause its telling me the line variable is already been used or in use on the canvas, I'm just unsure of how to turn that into a solution that will allow me to click the button a hundred times or more without being forced to MANUALLY make a hundred or more individual variables to store the line.
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Jun 5, 2011
I want to draw three straight lines on a form. if the following code is correct:
Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
Dim Line1 As System.Drawing.Graphics
[CODE]........
Can I use only one variable (Line1) to draw three straight lines?
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Jun 30, 2010
Finally took the plunge for wpf, all was going well until i needed to do a simple drawing on a canvas control (presume this is the right surface to use). First thing i noticed is that there is no paint event in wpf so i looked at a few others (Initialized, layout updated) at this point i looked under google and found very little on this. would anyone here have or know of a tutorial to allow this functionality? My application (a testbed) will draw an archery target within the canvas along with score numbers in the correct place as follows to do this it will need to draw several filled circles with black (or white) borders and text objects in the correct position. the locations and widths of the circles will be determined using a simple algorithm so my question is on the structure of paint events within wpf, are the commands the same as in gdi+?
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Mar 17, 2011
I'm trying to make a very simple Silverlight application.I want it to be full-screen, and I want to draw a line onto a Canvas.My problem is that the .Width and .Height of the canvas never seem to have a valid value. The website shows the canvas at 400x300 pixels or so, and when you click on it, it goes into Fullscreen mode.I want to use the Height and Width to find the usable space of the screen. I've tried adding events (thinking that the canvas wasn't yet ready to be used immediate after the full-screen line of code) but the LayoutChanged and Resized events don't seem to yield anything.
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Sep 3, 2009
how to count the lines in textbox1.text (with multiplelines). I don't need to count each character. I only need to count each line from top to bottom in textbox1.text (multiplelines) and I will use Label1 to display the numbers.
example:
1-pauljaones
2-tommyperrry
3-marktoms
4-Jonessmith
5-paulwhite
Obviously this is 5 lines and that's what I need to count.
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Jan 18, 2011
I've looked and tried.. and for some reason just don't seem to be getting right now.
I have a picturebox that is 250x500, I want to draw a vertical line from the top to the bottom.
Using gs = pbMap.CreateGraphics
'Do While x.X < 250
'gs.DrawLine(Pens.Red, x, y)
[Code].....
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Sep 24, 2010
Ok so im looking at this code and it cant possibly be right but im not sure how to do what i want.I have made a list of n points. I now want to click a button on my form and use the picturebox paint event to draw my lines between the points in the list.From what i can see i have at least two issues with this code. 1. Nowhere in this snippet do i reference the picture boxes paint event 2. I do not think that the loop i have is how to navigate through the list of Points to make my drawings.
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Apr 15, 2009
How do I draw straight lines? I'm working on a tic-tac-toe game and I have no previous experience with graphics in VB 2005. The MSDN doesn't exactly do a good job of explaining it. In QBasic it was very simple, you just did:
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Apr 8, 2010
[code] With these 3 subs (above) I can track the cursor movement with my window & can draw a horizontal & vertical lines from the location of the cursor. No problems there. Problem is I only want one set of lines ( thus mimiking extended cross hairs) & what I get is persistance. Previous line drawings, cannot be erased out & hence I get a colouring/paint effect in the rectangle. Great if you want that, but I do not want that. How can I negate that effect & draw only 2 lines which follow the cursor location?
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Jul 11, 2011
Step 1 - I plot 4 random points on an image in the picture box
Step 2 - I capture the co - ordinates for all the points
Step 3 - I draw a line from point 1 to point 2 (name it line 1)
Queries :
1) I need to draw a line parallel to line 1 passing through point 3
2) I need to draw a line parallel to line 1 passing through point 4
3) Extend the line from both the ends so that I can draw a perpendicular line passing through all the 3 lines so that it becomes a rectangle
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Apr 22, 2012
I have a problem drawing dotted path lines, with evenly spaced dots: I want to be able to draw evenly spaced dots along a path line using points in an array, My issue is not with drawing the path line, with dotted lines, this is easy, but with the spacing of the dots at the start and end of the path line.
In the example I have created, I create a square with 4 points and draw a dotted path.The path starts at the top left corner and finishes back at the top left corner, the dots are evenly placed along the path, except the final dots at the end of the path. (Sometimes the dots are even and other times they are not even).The shapes I want to draw can be any size and any shape, but I have used a square in this example to show the problem I have.I have also attached two pictures showing the dotted path line, 1 with even spaced dots at the start / End and another showing the problem I want to resolve, with not evenly spaced dots at the start / end.The only difference between the two is the point values.
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Oct 19, 2011
I'm doing a web application in which the user must make a series of figures such as rectangles, text boxes and lines, Is something like like google docs draw
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Aug 26, 2011
I want to draw string in multiple lines and and I want to know how many lines given string will take. I am using following method.
[Code]...
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Apr 13, 2012
Problem drawing dotted path lines, with even dots along the path line.I want to draw a path line that can be any shape (square, round, outline etc), and along this path line I want even dots to appear.
I also want to be able to resize the shape (as in the example attached)This is very easy to do using "DrawPath" and defining points for the path and using a pen defined as dots.The problem I have is I want the dots to be evenly placed along the path, on any shape or size I draw.In the example I have created, I create a square with 4 points and draw a dotted path.There are 2 buttons that allows me to resize the square (larger or smaller) this helps show the problem more clearly.
The path starts at the top left corner and finishes back at the top left corner, the dots are evenly placed along the path, except the final dots at the end of the path. (Sometimes the dots are even and other times they are not even).The shapes I want to draw can be any size and any shape, but I have used a square in this example to show the problem I have. point me in the direction I need to go that allows me to draw the dots and give the impression that they are even all along the path, for all shapes and sizes.
In the pictures below if you change the size of the shape, one will have even looking dots, the other will not.
[Code]...
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Oct 7, 2009
I got down the drawimage part. The problem I am having, is when I draw another image, it replaces the old one. Here is my
vb
Public Class Form1
Dim PicPoint As Point
[Cod].....
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Apr 12, 2012
I want to draw a path line that can be any shape (square, round, outline etc), and along this path line I want even dots to appear. I also want to be able to resize the shape (as in the example attached) This is very easy to do using "DrawPath" and defining points for the path and using a pen defined as dots. The problem I have is I want the dots to be evenly placed along the path, on any shape or size I draw.
In the example I have created, I create a square with 4 points and draw a dotted path. There are 2 buttons that allows me to resize the square (larger or smaller) this helps show the problem more clearly. The path starts at the top left corner and finishes back at the top left corner, the dots are evenly placed along the path, except the final dots at the end of the path. (Sometimes the dots are even and other times they are not even).
The shapes I want to draw can be any size and any shape, but I have used a square in this example to show the problem I have. I need to to draw the dots and give the impression that they are even all along the path, for all shapes and sizes. [Code]
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Apr 13, 2011
I'm basically trying to make a simple, easy-to-use, paint program. I seem to be having problems with using multiple colors in the PictureBox1_Paint option. It draws the graphics but when you change the brush color and click in the picturebox it changes the colors of the previous graphics to the color you are currently trying to use. I need it to allow multiple colors.
Here's the code that I'm currently using..
Imports System.Drawing.Drawing2D
Public Class DynosPaint
Inherits System.Windows.Forms.Form
Private IsFormBeingDragged As Boolean = False
[code]....
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Apr 13, 2011
I'm basically trying to make a simple, easy-to-use, paint program. I seem to be having problems with using multiple colors in the PictureBox1_Paint option. It draws the graphics but when you change the brush color and click in the picturebox it changes the colors of the previous graphics to the color you are currently trying to use. I need it to allow multiple colors.
Here's the code that I'm currently using..
Imports System.Drawing.Drawing2D
Public Class DynosPaint
Inherits System.Windows.Forms.Form
[code]....
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Mar 15, 2011
I need to draw a bitmap background with one or more moving bitmaps in the foreground; something like a chessboard where pieces move across it. I use a timer-tick event to redraw the background and then draw the relocated foreground image like the code below. But I get flicker, even though I set the form to use double-buffering. The culprit seems to be redrawing the background to refresh where the foreground images used to be; no flicker if I replace the background DrawImage with a simple Graphics.Clear. I think what I want to do is draw the background, and the foreground bitmap(s), in memory and then render it all. I used to do this with double-buffering, BitBlt, and .Refresh in VB6 but I haven't found the equivalent in VB2010. This must be a pretty common graphics requirement; what's the trick to it?
Dim Gfx As Graphics
Me.SetStyle(ControlStyles.AllPaintingInWmPaint Or ControlStyles.UserPaint Or ControlStyles.OptimizedDoubleBuffer, True)
Dim rectBrd As Rectangle 'use as clipping region for drawing
[Code].....
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Nov 4, 2010
I am trying to figure out a way of combining the below Dim statements into one line and maybe also combining Return dblResult into there. currently it is three lines and I have been told that it is possible but kind of lost of how to do it
[Code]...
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Mar 26, 2011
I have a string STR="CYHZ 262338Z 2700/2724 27012G22KT P6SM BKN040 TEMPO 2700/2710 5SM -SHSN BKN015 BECMG 2702/2704 28015G25KT FM271000 28018G28KT P6SM BKN040 BECMG 2722/2724 27012KT RMK NXT FCST BY 270300Z"
I want to put the new line characher before these words in the string(TEMPO, BECMG, FM, RMK) so that the output string look like this
[Code]...
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Feb 5, 2009
So i am working on something for school. And we have to make a program that has 2 buttons, 2 text boxes used for input and a label used for output. One button is New Customer wich displays this in the output label (named totalLabel)
Public Class Form1
Private Sub newButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles newButton.Click
[Code].....
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Feb 25, 2011
I'm creating a button on my project that when clicked it will enter the information in the comment "" area and store it into the clipboard to be pasted.
My issue is whenever I try to put the multiple lines in the comment field I get a syntax issue.[code]....
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Feb 4, 2009
Is there any SHORCUT for multi lines commenting in vb.net .. Altouhgh i know there is an option in toolbar for multilines comments but i want to know a keyboard shorcut for it...
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May 4, 2012
I have tried multiple variations of the following code, but I still get the same result. I am trying to have the last line "Issue Description: ...." to appear on a new line. I have tried vbCrLf, vbCr, and & Environment.NewLine & _ None of which work.
Just a note: The other emails are properly formatted. Also, if I add put 2 vbCr (s) at the end of the 'Issue Title' line then it looks normal.This one in particular seems to be a thorn in my side.
The result:
The code:
Dim mail As New MailMessage()
Dim strbody As String
strbody = Nothing
[code]....
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Jan 22, 2010
Tab control that has multiple lines of text
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Jan 30, 2012
i've got my basic AutoTyper ready (well and one with autoupdating etc in it) but it's only a singular line. [Code] What I want to do it to type multiple lines, I know I'll have to enable multiline on the TextBox. I want it to type one line per time interval using 1 timer. I don't know how but I know it would have to count the lines but from then on I'm stuck. I will need to make it type line 1, then on the next loop line 2 and go on until it's reached the amount of lines from the count then repeat from line 1. [Code]
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Aug 26, 2009
How would I make it so that if someone presses a button, the richtextbox will have more then 1 line of text
RichTextBox1.Text = "Something like this, but 2+ lines"
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Apr 15, 2009
I know how to write one line to a text file and read one line from a .txt file. How do you write multiple lines to one .txt file?
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Apr 1, 2012
I'm new to Visual basic (which will be obvious from my question) and am writing program that does various calculations, then displays the results in a list box. the results, however, are all concatenated, end don't each appear on a new line. I tried adding a carriage return/line feed at the end buit the compiler rejected it.
I can't find any examples of creating a list box, and adding multiple entries (one for each time a loop is performed), nor of how to use columns to make the resulting display cosmetically pleasing.
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