Drawing Lines From A Point List?
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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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 12, 2009
I created a new webbrowser and it's not showing up. I can change the height but when I change the location it says can't convert integer into drawing point. I made sure it's visible and added it in the form.
[Code]....
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Sep 3, 2010
I'm working on a game engine, and I want to be able to draw a billboarded (i.e. rectangular to the screen) quad with the center-bottom of the quad being determined by a single point.
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Mar 10, 2011
First, the overall objective is to find the best point within a multipoint filled 'star', at which to start drawing text. That is, depending upon the size of the star and the number of points, there is a larger or smaller area within the points that is filled with colour. So a 5 point star has a relatively small area that is filled, in which to draw text. A 40 point star of the same radius has a much larger area filled. If I can determine the size of this area as a rectangle, then I can measure the string and draw within it using the best fit font and starting position. The code below is an attempt to answer the question but I am stuck trying to find the text area rectangle within the filled portion of the star. Some of the code exists purely to explore the means to determine how to identify this rectangle (and is probably the totally wrong direction).
The second part of the problem is in exploring the options, I tried to draw a vector to different points on the circumference of the star. This is the code highlighted. The lines drawn do not seem to be the correct length nor the correct angle but I cannot see why.[code]...
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Feb 2, 2012
I have several picture boxes on a form (frmMain).My question is, how do I paint a point on a particular picture box at the location specified by the coordinates of the current mouse position? The snippet below shows defining some canvases and pens. But I'm not sure how to capture the mouse position when the mouse is over a particular picture box and how to paint the actual point at that location.[code]
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Mar 15, 2011
Im getting an error right now for this code, and I'm wondering if it's me, or VB2010 has changed?
Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
If e.KeyCode = Keys.Left Then
[code].....
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Jun 8, 2010
I'm just getting started, and it's as simple as that: I need guidance to draw a rectangle or place a dot or a point on Form1, in VB 2008 Express. I knew how in VB6 -- let's build on that.
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Dec 27, 2009
I'm drawing a rectangle snapped to a grid by getting the start point(Mouse down e.location) and the end point(mouseup(e.location). The coding I'm having trouble with is having the program determine which way to draw the rectangle(where the location should be, and the height and width.) Now, this would be extremely simple if the user started their rectangle from the top left corner and ended it in the bottom right every time. But you need to be able to drag from all angles. So does anyone have some code lying around that I could look at so I could actually get my rectangles drawn right?
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Jul 17, 2009
If I try to draw a circle by using e.g.
Code:
e.Graphics.DrawEllipse(Pens.Red, 50.133, 100.321, 0.1, 0.1)
I will get an error message. I tried something like
Code:
Public ObjectPoint As PointF
Dim cpoint As New PointF()
cpoint.ObjectPoint = New PointF(startX, startY)
e.Graphics.DrawEllipse(Pens.Blue, cpoint.ObjectPoint, 0.4, 0.4)
but it didn't work for the location and the circle size. How to draw a circle(and rectangle) by using floating point numbers?
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Jul 6, 2010
Dim pt As Point, is the problem here, i know that this class point can belong to the types Inventor or System drawing.I want to make it part of the System drawing, how i do this ?
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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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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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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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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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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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Jun 4, 2009
I am suing VB 2008 express edition.
I am trying to solve this problem since many days. The problem seems to be rather mathematical, but I faced difficulties dealing with Grids and how to store them using visual basic.
[URL]
In my problem, I have a world of 200 x 200 units divided into 4 x 4 grids (Each of 50 units).
There is a line crosses some areas has the coordinates of Point A (Starting Point) of (XA = 12.43, BA = 159.48) and Point B coordinates (Ending Point) of (XB = 112.95, YB = 20.95).
The question is, how can find the length of (A to C1), (C1 to C2), (C2 to C3), (C3 to C4), (C4 to C5) and finally (C5 to B)?
In addition, how can I indicate the square in which the line is inside?
note that the method should work for all conditions (-ve and +ve line slopes) and for different A and coordinates.
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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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Jun 4, 2009
I hve been working with points a lot recently, and I have been wondering if there is a way to set a point without setting point.x and point.y separately. For example for (3, 5): Point1 = (3, 5) But that isn't right
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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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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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May 15, 2012
I am using the following Caml Query to get data from a share point list.
oSb.Append(" <OrderBy>")
oSb.Append(" <FieldRef Name=""Title"" />")
oSb.Append(" </OrderBy>")
But this query is giving me all columns of list. Is there any way to get only desired column from a share point list using Caml Query?
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Aug 11, 2009
how to add multiple text to a point pair list in Zedgraph. Add text to one point pair can be done like this:
Dim myPane As GraphPane = zg1.GraphPane
Dim TextObj As New ZedGraph.TextObj("High", 10, 10, CoordType.AxisXYScale, AlignH.Center, AlignV.Center)
[Code]....
Theres a problem with the code above when the graph scrolls the text is following as it should, but it's also visible in the pane background.
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Mar 26, 2010
I have a list of collection of points on the screen. I want to order them based on their distance from a seperate, independent point. What's working is I have a function GetDistance which does the dirty pythagorian work of returning the distance between two points.
'Create the set point from which to start all measurements from (startpoint)
dim SetPoint as new Point(200,200)
'Create a list to hold arbitrary points to test (endpoints)
dim ListOfPoints as new list(of point)
[Code].....
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Feb 28, 2010
I have a table with 2 rows named timeStamp and value. I know I can iterate through the rows and create points and add them to a list (new point(timeStamp,value), but is there a way to do it without iteration?
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May 1, 2011
I want to create a list of BrushInfo which has properties of a brush name and its type from System.Drawing.Brushes.[code]The code above will get me the name of the brush (p.Name) but will not get me the type of the brush (i.e. System.Drawing.Brushes.AliceBlue). How do I get the brush type?
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May 6, 2012
I have written code to download a webpage HTML source code into a .txt file, once downloaded, the code I posted here adds all lines as strings into a list and is supposed to find an anchor point as a position reference and then jump down the list to the real keyword.
I have an anchor point in this list that is a constant that I will always "know of" but I need to jump down 3 lines below this anchor point to the real keyword I'm looking for that is always "unknown to me" since it's a variable.
My anchor point is the keyword Hair Color which both the words and the line they're on are unique in the entire source code. My target keyword is the variable Brown (in this case), that I can't target directly because neither it nor the line it's on are unique and will change from query to query. The HTML table source code like the one below is always structured the same but some pages may vary in layout depending on the keywords applicable on the webpage. The code structure below however is always a constant, you can always count on all the webpages that the keyword Hair Color is always the 3 line into the table row and its variable is always 3 lines below that. So even though the answer I'm looking for is always 3 lines below my anchor point, my anchor point will not always be on the same line of code in the source code.
HTML code in the .txt file:
<tr>
<td class="paramname">
<b>Hair Color</b>
[Code].....
I may not be using the code correctly, through my attempts I don't know how to do that jump.
how to "skip" or "jump" down lines in my list by predefinition like: "ok, I found my anchor point, now I'm supposed to jump down 3 lines and pass what ever I find there to a string!""ok, I found my anchor point, now I'm supposed to go to the second instance of the keyword Brown from here that I find and pass what ever I find there to a string!"
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Feb 14, 2011
I have a Diagonal line drawn on a picture box on my forum and i need to know if the user has clicked the line I have the Start point and End Point of the Line and the mouse x,y location So i basically need to find out if the x,y of the mouse is on the line.
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Oct 7, 2009
I have two list boxes created. They are populated when I enter the quantity and the price (one list box for each). This data actually comes from another set of text boxes. The problem is when I have two or more items in each list box I'm unable to come up with the total. I need to take the quantity * price for each entry and then add that to the quantity * price for the other entries. When I press my "total" button it's only doing the calculation for the first line.
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