Finding All Points Inside A Polygon?
Feb 9, 2011
I'm making a game for a school project We've created a character that moves around the screen and creates blocks behind him as he moves around.We want to make it so that when the character moves from one edge of the screen to another, it fills the screen. So in order to do this we have a Points array that stores every point the character touches on his way to a wall.We then fill the Points array with "formsurface.fillPolygon(Points)"Now I'm wondering is there anyway we can retrieve all the points that are WITHIN or INSIDE the Points array we made? ( remember the points array simply contains the outline or the path the character created, we're filling inside that outline)
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Jan 31, 2010
how can i get the points which make a polygon from a region which was derived from the polygon's points?
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Apr 20, 2010
is there a way to offset the points in a polygon without having to change each one individually the points are in an array
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Apr 11, 2012
how can i calculate the 13 points on the polygon (see image)?
the 2 points either side of the centre points
are +/- width or height * 0.2761423749154
i have 4 known points, topLeft, topRight, bottomRight, + bottomLeft.
the polygon won't always be a regular rectangle as it is in the image
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Jan 31, 2010
how can i inflate an array of points which describe a polygon?
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Feb 29, 2012
A 2D object has an x/y location, x/y direction, and a velocity.During each update, its location = (location + (direction * velocity)).
This enables it to travel in any and all directions at varying speeds.Using this information, how would you find the angle (in degrees, from 0 to 360) between it's current location, and it's next location, and then use that to determine it's heading (N, S, E, W, NE, NW, SE, or SW)?
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Mar 30, 2011
How can I calculate the bounding rectangle of an ellipse using 4 points on the ellipse?
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Jan 17, 2010
Imagine a grid of 16x16. All points are integers, there will be no partial points.I have a list of points that fall somewhere on that grid. Since each point is has an integer x,y coordinate, there can be a maximum of 256 points, but normally there will be considerably less than that.What I am trying to do is take a new point N and find the closest point to it in my list of points. The brute force approach is to use the Pythagorean theorem to find the absolute distance from each point on the list to N, and the minimum of all those distances would give me the closest point. However, since there could easily be 100 points, or so, and there is a real advantage to speed in this case, I am looking for a faster way to do this.
The first thing I thought of would be to divide the grid into four quadrants of 8x8. I could then quickly determine which quadrant N was in, and I was able to pre-compute which quadrant each of the points on the list was in. Therefore, I could easily narrow the search down to the points in the same quadrant as N, but that is invalid. If N lies near the boundary of a quadrant, the closest point might not actually be in the same quadrant as N.So what I am looking for is a way to search a list of X,Y points to quickly find the point closest to some other point N. The fact that the search area is 16x16 might help. A certain amount of pre-computation can be done on the points in the list if it helps, but N can fall anywhere in the grid.
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Jun 7, 2011
how do you draw or place a polygon/line within another polygon e.g. a circle within a triangle.
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Oct 27, 2011
I have a DataList inside another DataList. I want to access the child DataList "dlQuestion" events, ItemDataBound event. Also, I'm tring to find the control LableControl "lblQuestion" in the child datalist. How do I do that? Here's the mark-up:
<asp:DataList ID="dlSection" runat="server" Width="100%">
<ItemTemplate>
<div>
[code].....
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Aug 8, 2011
Im trying to find a tag inside of a tag, so far ive gotten this, but i have no idea how to find another tag inside.There are multiple li tags with data inside so once it find the li tag that equals "a username" i want to click the button tag under it.
If (WebBrowser1.Document IsNot Nothing) Then
Dim Elems As HtmlElementCollection
Dim WebOC As WebBrowser = WebBrowser1
[code]....
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Sep 25, 2010
I know how to get a Color (Pixel) from a location
im BMP As New Drawing.Bitmap(1, 1)
Dim GFX As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(BMP)
GFX.CopyFromScreen(New Drawing.Point(MousePosition.X, MousePosition.Y), _
New Drawing.Point(0, 0), BMP.Size)
Dim Pixel As Drawing.Color = BMP.GetPixel(0, 0)
Me.BackColor = Pixel
What I need assistance in is, I am going to create a form. and i wanted to know if there is a way. to Check (not using the mousex and mousey positions) for example. a Rectangle Sized Location to see if anywhere in the back red appears and if red does appear To give an error.
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Nov 8, 2010
I have tried this but it does not work:
[Code]...
What is the solution?
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Dec 2, 2011
I'm finding a dropdown in an ascxcontrol on my aspx in the following way.
Dim cp As ContentPlaceHolder = DirectCast(Page.Form.FindControl("ContentPlaceHolder1"), ContentPlaceHolder)
Dim ascx As UserControl = DirectCast(cp.FindControl("drpType"), UserControl)
Dim drpType As DropDownList = DirectCast(ascx.FindControl("drpType"), DropDownList)
Is there a faster way without having to acces all the elements on the page?
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Nov 14, 2011
I am working on arrays and I am currently having trouble with searching and finding arrays. In this example, the user should be able to enter a Name, and it will output that person's stats.
Here is the text file (note, I should be able to go to this text file, add a few more names and the code should still work, which is why I am using loops,arrays,text files instead of if and else statements),
Kobe,29,6,4
Allen Iverson,28,7,4
Jason Kidd,12,10,9
So if the user enters Jason Kidd in the text box, this will display in another text box:
Jason Kidd averaged 12 points, 10 assist, and 9 rebounds.
[Code]...
All right now is the searching part. I really do know how to search for what the user entered and display the statement in a text box. I kind of have an idea of how to just get the name, but for it to get the name and then all the data for that name puzzles me even more.-I tried using .contain, indexof and few others.
I know to display the information in the text box will be something like:
textboxoutput.text = PlayerName & " averaged " & PlayerPoints & " points, " & PlayerAssist &" assist, and " PlayerRebounds " &" rebounds"
So basically, I want it to where the user can enter a basketball players name and display the values for that name.
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Apr 28, 2010
I have this code
Text1.Text = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData)
but, when I run it, it produces an error: Compile Error: Variable not defined and it points to the second "Environment" string, the one inside the parenthesis. Is there a reference that I should be enabling?
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Nov 19, 2010
I'm having an issue when passing an object of type Dictionary(Of Int16, Polygon) as an argument to a backgroundworker so the background worker is able to access the Polygons in the Dictionary. I'm getting the typical "The calling thread cannot access this object because a different thread owns it" message.[code]...
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Nov 27, 2010
If I have some polygon lat lon coordinates stored in sqlserver db. how would I query it to see if a point was in contained within a polygon?
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Feb 18, 2011
I just finished creating a program where you find the area of a 5 sided polygon. But not I want to actually draw the polygon given the coordinates
Private Sub PI_Estimation_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
Dim myGraphics As Graphics
[code].....
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Dec 23, 2011
I have a collection of latitudes and longitudes and I'll be grabbing sets of these and want to draw a polygon based on them.The datasets won't be the outline so will need an algorithm to establish which ones make up the outline of a polygon containing all the latitudes and longitudes supplied. This polygon needs to be flexible so the polygon can be concave if the points dictate that.
My code below produces a horrible looking polygon. As explain in my first post I want to create a nice concave or convex polygon based on the latlng's provided.Just need a way of plotting the outer latlngs.
function initialize() {
var myLatLng = new google.maps.LatLng(51.407431, -0.727142);
var myOptions = {
[code]....
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Jan 5, 2010
i dont know how to do this.i need to create a macro to use on microsoft excel to calculate the area of any polygon. my problem is similar to this one: [URL]..but de vb code is not working for me.in attach i send the excel page.i also have to calculate the coordenates of the "center of mass", Cx and Cy using diferents functions.
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Apr 21, 2009
On click, I'd like this piece of code to create new polygon, shown in multiples with different coordinates and colors, sizes and orientation. Color and polygon in multiples works. My issue is I'd like to add more code that will allow each of the multiple polygon created scaled randomly and rotated. How to keep the polygons inside the canvas?
So far looks like this when user clicks start: [URL]
Code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles startButton.Click
Dim endCount As Integer = random.Next(1, 10)
Dim plotPoint As New Point
For count = 1 To endCount
[Code] .....
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May 18, 2009
I'm working on a small freeware application in Visual Studio 2008 Standard that will match geographic data to a geographic position. For this I need some mathemathical functions and one of them is how to detect if a point is inside a polygon. There's a great solution for this from the Microsoft team at: [URL]
but it is in a different programming language that I do not know anything about. How can I use these functions in my program? I'm afraid that if I try to rewrite them in Visual Basic I'll make mistakes that I can't detect. To be complete, I'm not using screen graphics so I really need a mathemathical solution.
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Apr 6, 2012
I'm trying to write a simple game ui, it is grid/tile based, and i have the grid built using grid column and row definitions and I'm successfully placing objects in various grid locations. I am currently stuck as trying to build the player object. I want a single object reference to represent the various components of the players piece.
Currently I am using a polygon to represent the piece on the grid. Eventually I want to replace this with images or something. I want to add in properties for what weapon and armor it has equipped I want properties for health
Essentially in code i want something like this
dim player1 as new playerobject
player1.polygon.points = 0,0 60,30 0,60
player1.health = 100
[Code]....
I can instantiate all this as separate variables etc, but I'd like to have a singular reference that contains all the variables, properties, objects, controls etc.
I'm using vb .net in vs 2010 (and no, I'm not looking to write in something else)
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Jun 10, 2011
I'm trying to write a simple game ui, it is grid/tile based, and i have the grid built using grid column and row definitions and I'm successfully placing objects in various grid locations.I am currently stuck as trying to build the player object. I want a single object reference to represent the various components of the players piece.
Currently I am using a polygon to represent the piece on the grid. Eventually I want to replace this with images or something.I want to add in properties for what weapon and armor it has equipped I want properties for health Essentially in code i want something like this
dim player1 as new playerobject
player1.polygon.points = 0,0 60,30 0,60
player1.health = 100
player1.weapon = "axe"
etc
I can instantiate all this as separate variables etc, but I'd like to have a singular reference that contains all the variables, properties, objects, controls etc.I'm using vb .net in vs 2010.
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May 31, 2010
I've created a polygon shape and filled which fills blue on startup.Upon toggling a check box it should be filled yellow.It doesn't go yellow (unless i step through in debugging).
[Code]...
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May 30, 2012
I am writing a program wherein the user draws shapes by clicking a button for the desired shape and then clicking on points on the drawing area. I cannot figure out how to store four clicked points to create a foursided polygon. I read many articles that say use the "mousedown" command and store points in a list, I have tried but it's not working for me. To summarize, I need the user to click the polygon button, go to the drawing area, click four points and have a foursided polygon created.
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Jun 22, 2010
I am developing the map tool application in vb.net where user can create maps. I gave the check boxes for show/hide the layers of map like village boundary(polygon), plot boundary(Polygon), roads(Lines), bore wells(points), dug wells(points), schools(points).
I am using the function RedrawMap for displaying various layers of maps as user checked the check boxes. If user click village boundary map shows the village boundary etc on panel control named "picMap".
The problem i am facing is when user check the village boundary layer map shows the boundary but when user check the next polygon layer i.e. plot boundary layer it gives the error message "5:Object is currently in use elsewhere.".
My code is as follows:
Public Sub RedrawMap(ByVal index As Integer)
Dim f As Font
'Object Style
Dim Size1 As Short
[code]....
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Sep 5, 2010
So, I have a textbox with the following text.
Code:
TITLE"Hello there"
blah blah blah etc...
I want my program to find the TITLE text, and then put the text in the double quotations in a variable.
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Apr 30, 2012
I am making an invoicing application. I have a label (lblCost) inside of a UserControl (InvoiceEntry) inside of a FlowLayoutPanel (pnlEntries). InvoiceEntry represents a line item on the invoice, and pnlEntries is the "body" of the invoice. pnlEntries can hold several InvoiceEntry controls.
I am attempting to sum all of the lblCost values from each InvoiceEntry control to make a subtotal, and I want that subtotal to change automatically if costs are changed (e.g., a change in quantities being ordered). Is there a way to handle when the lblCost.Text property of any of the InvoiceEntry controls contained within pnlEntries changes?
InvoiceAdd.vb:
' Instantiate objects of the various database interaction classes.
Private mCustomer As New Customers
Private mItem As New Items
[code]....
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