VS 2010 Object Rotation And Move Object With Arrow Keys?
Feb 8, 2011I want to learn how to rotate an object by direction and speed and also how to move an object using the arrow keys?
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VS 2010 : Make Arrow Keys Move An Object?
Apr 18, 2012there is this picture on the form How would you make arrow keys move the object around the screen?Also how would you make buttons correspond to arrow keys?
View 3 RepliesObject Move With Arrow Keys
Sep 13, 2009I have been searching all over the internet for the answer to my problem; How do I move an object according to the arrow keys pressed? I have this code;[code...]
It builds all right, but nothing happens. I have the KeyPreview on, but it still doesn't do anything.
Making An Object Move Using Arrow Keys
Jun 20, 2008Ok well just started to learn Vb 2008 and im trying to make an image move using the arrow keys..im trying to make a little game just for practicing and im having trouble getting my sprite to move.
View 4 RepliesVS 2010 Using Up / Down Arrow Keys To Move Through Textboxes
Feb 25, 2011How would I go about doing this? I was thinking I could possibly use Tab index?
View 4 RepliesGame Programming :: Detecting Whether One Of The Arrow Keys Is Pressed, All The Other Keys Seem To Be Detected Apart From The Arrow Keys?
Oct 21, 2008I have a problem detecting whether one of the arrow keys is pressed, all the other keys seem to be detected apart from the arrow keys??? I have set key preview to True........ It detects the arrrow keys BUT ONLY if I have NO other controls on the form??? example..
Me.Text = e.keycode
It works, but then if I add a button for example, it stops.
Move A Picture Box With Arrow Keys?
Oct 10, 2010I have been trying to figure this out all night, so I figures it's time to ask you guys.
I can't figure out how to make a picture box move when a key is pressed. It works fine if I use a button.[code]...
Move A Panel Using The Arrow Keys During Runtime?
Jan 13, 2010Is there any way you can move a panel using the arrow keys during runtime?and is tehre a way of popping random objects in a game. Like you have this spaceship moving and your "Alien foes" or whatever attacks you. So you want them to pop up randomnly every few seconds or so. How?
View 10 RepliesMove A Picture Using Arrow Keys Press?
Feb 2, 2010How do i make it so when an arrow key is pressed, it will move a picture in that direction?
View 2 RepliesMove A Rectangle Shape Using Arrow Keys
Aug 6, 2011I am trying to move a Rectangle Shape using the arrow keys and i have done multiple codes and none of them work. Can anyone help me with the coding.[code]also I am not sure if the code goes in Form1_KeyDown or RectangleShape1_KeyDown
View 1 RepliesVS 2008 Move A Picture Box With The Arrow Keys + More?
Mar 27, 2010I need to be able to move it up with the up arrow key, down with the down arrow key, left with the left arrow key, and right with the right arrow key.I know my "Player" works by the way:
Private Sub PlayerPic_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PlayerPic.Click
MsgBox("test")
[code].....
VB2010 Using Arrow Keys To Move A Shape Also Changes The Value Of Trackbars Elsewhere In The Program?
Jun 30, 2011Using arrow keys to move a shape also changes the value of trackbars elsewhere in the program?
View 7 RepliesRecored Arrow Keys And Then Tell Computer To Enter Arrow Keys?
May 23, 2010So I found this little morpg. The game is fun but really repetitive. I would like to simplify some of the tasks in the game. I do not know how to start this project. How can I recored arrow keys and then tell the computer to enter the arrow keys? One of the objectives in the game is to run around a farm 2x and scare away any wolfs. So the commands would be "arrow key up" for 30sec and then "arrow key right" for 4 sec and repeat. I have worked with robots in real life for some time. We would fill arrays with such instructions. One of the most fun things to program! But I have no idea how to do this in VB.
View 12 Replies3D Object Rotation In 2008?
May 19, 2009I'm developing a sun shading analysis tool, and part of the analysis involves rotating a house (modelled as a cube consisting of 8 points) by the solar azimuth and solar altitude angles. The reason for this is to determine if the wall in question is facing the sun, and if so I run a shading analysis using a scanline algorithm to determine the percentage of wall plane that is in shade from a tree in the yard (this is modeled using overlapping 2D polygons). The purpose of the rotation and tilt of the object is so that the wall plane is directly perpendicular to the sun, so that the analysis can be done in 2D as opposed to 3D.
I first rotate each point of the house (which is stored in an array) through the azimuth, and then tilt it up through the solar altitude angle. I have set up my 3D coordinate system using the standard right-hand rule for orientation of the x,y,z axes. I'm using a basic rotation matrix as follows:For the azimuth, I am rotating around the z-axis, so I am using the following matrix transformation.
[x',y'] = [x*cos(azimuth) - y*sin(azimuth) , x*sin(azimuth) + y cos(azimuth)]For the altitude, I am rotating the object about the x-axis to tilt it up. I use the initial z-coordinate and the transformed y'-coordinate for the altitude tilt calculation.Each point, when completely rotated and tilted, will have a distinct set of coordinates: [x', y'', z'].Individually, the rotation and tilt work fine. But when I try to do them consecutively, I run into problems.
VS 2010 Search Listview: Object Reference Not Set To An Instance Of An Object?
Jan 18, 2011I'm using the following code to try and search a listview (I got it from msdn):
Dim atem As New ListViewItem = ListView1.FindItemWithText(TextBox2.Text, True, 0, True)
If atem IsNot Nothing Then
ListView1.TopItem = atem
End If
Then I got the " Object reference not set to an instance of an object" error highlighting the following line: ListView1.TopItem = atem So then I tried this:
Dim atem As New ListViewItem atem = ListView1.FindItemWithText(TextBox2.Text, True, 0, True)
If atem IsNot Nothing Then ListView1.TopItem = atem End If it still isn't working.
VS 2010 Structure Of Lists - Object Reference Not Set To An Instance Of An Object
Oct 16, 2011I am struggling with the following - I try to add a value to a list, where the list is defined in a structure.
[Code]...
Flattening An Object Hierarchy Using A Shim Class - Initializing Derived Object Properties From The Base Object?
Jul 10, 2010I am somewhat new to object oriented programming and am attempting to flatten a Linq object hierarchy by using a shim class.how to initalize a derived class with property values from a base class?I have two objects, a base object with about 100 properties, and a derived object which inherits from the base object and adds a few additional properties beyond those of the base object. My simple constructor creates the derived object, but I am looking for a way to initialize the derived object properties with values from the base object.Right now I am using reflection to iterate over the properties individually and I suspect there may be a better way. The following example shows my shim class constructor for the derived class, and two properties:
newProperty1 - a new string property of the derived class
flattenedProperty2 - a new string property of the derived class, copied from a 2nd-level object of the base class
Code example:
Public Class derivedObj
Inherits baseObj
Private _newProperty1 As String[code].......
Is this the correct constructor approach to flatten the object hierarchy using a shim class? My second question relates to initialization of properties in the derived class. The constructor above creates the derived object, but what is the best way to initialize the derived object properties with values from the base object? The following code uses reflection to iterate over the properties individually, but I suspect there may be a better way.
Code example:
' property names are in the string array fieldNames
'baseObjQuery is an ienumerable of baseObj
'derivedObjList is a list of derivedObj[code].....
Is there a simple way to initialize values for the properties in the derived object based upon the values of the common properties in the base object?
VS 2010 - Error : Object Reference Not Set To An Instance Of An Object
Jun 22, 2012I get error (Object reference not set to an instance of an object)trying to read a reg key, it stops after the first msgBox which shows MyRegKey value it shows a blank value
Dim MyReg As Microsoft.Win32.RegistryKey = Microsoft.Win32.RegistryKey.OpenRemoteBaseKey(Microsoft.Win32.RegistryHive.CurrentUser, (OldPCTxtBx.Text))
Dim MyRegKey As Microsoft.Win32.RegistryKey
[code]...
VS 2010 : Error: Object Reference Not Set To An Instance Of An Object
Nov 18, 2011I have a treeview with a contextmenu. I'm trying to disbable specific items in the contextmenu when the user doesn't have a node clicked, but each try gives me the same error: "Object reference not set to an instance of an object."I tried several methods in the Mouse_Down-event (IsSelected, etc), this was my last:
If .Nodes.Count > 0 Then
If .SelectedNode.Text <> "" Then ' <<< this line is highlighted
enable_expl_mnu() ' enable the contextmenu
[code]....
VS 2010 Error , Object Reference Not Set To An Instance Of An Object
Jul 9, 2010I get the error, Object reference not set to an instance of an object., on:
vb
For Each comboItem As String In My.Settings.ComboBox1
That code is in:
vb
Private Sub Me_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Me.Load
For Each comboItem As String In My.Settings.ComboBox1
[code]....
I am trying to get it to load those settings when the program loads up, VS does not report that program till i attempt to run in debug. Before the program is even loaded that happens.
Get The Object To Accept Two Different Keys At Once
May 2, 2011i have a game with a moving sprite and it goes foward left back and right. i cant quite figure out how to get the object to accept two different keys at once and move in that direction in the code. ill attach my code,
[Code]...
VS 2010 Object Reference Is Not Set To An Instance Of An Object
Mar 14, 2012I've created two Forms of which second one is opened with ButtonClick event with statement: Form2.Show(). Everything worked great until I declared some variables directly under Public Class Form2 (actually they are inputs in TextBoxes of a user which are placed on Form2). Error is: InvalidOperationException was unhandled - Object reference not set to an instance of an object.
View 10 RepliesVS 2010 Object Reference Not Set To An Instance Of An Object?
Jan 4, 2012i got a html to pdf conversion source using the opensource itextsharp library from the[URL]..I copied the code exactly in vb.net 2010 after referencing the library and it gives the 'Object reference not set to an instance of an object' error in the bold line... couldnt find a solution to it..
[Code]...
Iterate Through The Keys And Values Collections Of A Dictionary Object Using An Index?
Apr 25, 2009I have a VB.NET project where I am able to iterate through the keys and values collections of a dictionary object using an index:
MyDictionary.Keys(idx)
MyDictionary.Values(idx)
When this code is taken from the test project and placed into the real project I get the following error:
'System.Collections.Generic.Dictionary(Of Double, String).KeyCollection' cannot be indexed because it has no default property.[code]...
In the line in sub search that says "dtf.Keys(idx) = 0" place your cursor after the right parenthesis and backspace you should get a tooltip that says, "<Extension> ElementAtOrDefault(index as Integer) as Double - index: the zero based element of the index to retrieve.
Move An Object Using Gdi+
Feb 17, 2009I'm making a space invaders game and have simply used pictureboxes for all the aliens and the tank etc. This is really slow during gameplay so i'm hoping gdi+ will be faster. I've been researching how to do this for hours on end with no success. All I want to do is create a gdi object in the form of a bitmap or jpeg and for it to move across the screen smoothly at reasnoble speed.
[Code]...
Move Object When App In Run?
May 18, 2011I want create an app with the object that can be move by user.
For example I have 1 WebBrowser1, I want to user can move the object any where in the window.
VS 2010 Label Font Bold - Error "Object Reference Not Set To An Instance Of An Object"?
Mar 4, 2011Everything I read points me that I'm writing the following code correct, but VS keeps telling me : Object reference not set to an instance of an object.
[Code]...
Key Up And What Are Arrow Keys
Dec 18, 2010I want to change the "a" and "d" to key controls left and right perspectively. and I am having some trouble wiht the key up event. KeyChar works for KeyDown (after I forced it to) but not for KeyUp (even though they share the same things). I finally figured out how to get the picturebox to change its picture, but now I am stuck at this part. getting an animation in, and when im done moving, get the animation back to the idle picture. im also having a little bit of trouble with movement. pictre - as a split second of movement and (space) as a split second of not moving, when i begin moving, lets say it goes this way (there is a space right after the first -, so that was a split second that it stopped and then started continuously started moving again). how can i make it so it goes nice and fluid once you start moving? also, if i were to press any single key while holding A or D down, it either stops and i have to press the key again to move it move or, it goes in the other direction(if I hit a then d, or d then a). and in the key up event, id like it so when the a (or d) key is up, it goes back to the stand animation, and when moving, it goes to the moving animation. [code]
View 12 RepliesUse Arrow Keys In VB?
Aug 23, 2011I use the up arrow means , it must goto the previous text box and if i use the down arrow means , it must goto the next text boxes. Totally i m used 15 textboxes. From text box1 onwards, if i use the down arrow means goto the next textboxes and also repeated to all text boxes.(1 to 15) From text box15 onwards, if i use the up arrow means goto the previous textboxes and also repeated to all text boxes. (15 to 1)Nithiyanantham
View 5 RepliesMove An Object On My Form?
Nov 5, 2008I have done lots of searching but came up with nothing. How do I simply move an object on my form? For example, how would I change the position of a button when I press a button? I'm sorry if this topic has been beaten to death
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