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Hi,
I'm new to the C language, but I am taking a course in it. My class has a project that I am having some trouble with. If anyone can give me some code to reference, a source code, or just point me in the right direction, it would be greatly appreciated.
Here is the assignment:
Create a simulation of 100 squares, each 16x16 pixels wide. Each square is initially white in color. Each square should be given a random position on screen, and a random initial velocity of between 0 and 5 pixels per clock tick in both x and y axes (i.e., x and y velocity can be different from each other). Square positions are updated every clock tick.
When squares collide, they change color to red, and remain red until they finish colliding. When a square no longer is intersecting another square, it reverts back to white.
A quadtree data structure of at least depth 4 must be part of the implementation of collision detection. Square position updates must result in updates to the quadtree, rather than a complete recomputation of the quadtree. It is unacceptable to regenerate the quadtree in each clock tick.
When a square hits the edge of the window, it should "bounce", and thereby stay in the visible part of the playfield.
Use of the GOTO statement outside of case statement blocks is forbidden.
_______
I reiterate, I know very little about C, so I even need help drawing the squares. Anything you can do to help, I really appreciate it. I will (obviously) credit whomever sends me reference/source code.
Thanks in advance
-Magy
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Hi,
welcome to CodeProject. We gladly answer specific questions, we do not do homework in general. And it pays to show you made some effort yourself.
For starters, is it C or C# you use (or even C++)? for C and C++, we have other forums.
If you don't know how to paint on a screen, you should refer to your course, or to the Microsoft documentation, or just Google. The answer depends on the language you use.
 Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that. All Toronto weekends should be extremely wet until we get it automated in regular forums, not just QA.
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I am using C#. I'm not looking for someone to do the project for me. I'm new to the language, and I just need some help getting started on this project. I have used my available resources (including Google), but the tutorials I have found are extremely vague, or irrelevant to my needs - which is why I came here.
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You mentioned a course and a class; those could be your primary sources of information.
You might learn some relevant stuff by reading some articles. In the list of my articles, you might look into the ones on GraphicsPath, Animation, Sokoban.
Within the realm of MSDN you should read about the Graphics class, e.g. DrawRectangle and/or FillRectangle.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that. All Toronto weekends should be extremely wet until we get it automated in regular forums, not just QA.
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You can draw "raw graphics" (coloured squares, lines, etc) in the paint event of a form/control (e.Graphics.whatever)
Your question is awfully vague though..
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what I'm going for here is something like this. i have a program i created I'm going to copy the .EXE
and a file to a CD, I'm going to give this CD to a user i want the program to auto run, meaning when the
user inserts the CD the program is just going to auto launch. Now i know how to auto launch the .EXE
with a .INF file but the problem i am having is this. In order for the program to run correctly it needs
to grab the file path that's on the CD with the program. My question is how can i associate the file with
the .EXE? I just need the path to the file for my program to run correctly. Before i was using a open
file dialog to allow the user to grab the path for me but now like i said i want it to auto run. I could
hard code the path to the file but there no guarantee that the end user CD drive will be the same as what
i code. Maybe using a XML file? or doing something with Environment class?? hopefully i explained well
enough if not please fill free to ask and i will try to explain better. thank you
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have a look at Application.ExecutablePath
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that. All Toronto weekends should be extremely wet until we get it automated in regular forums, not just QA.
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so i wrote the code below and it worked it automatically moved a file from my D: drive to my C: drive but when i try to run it from a CD, it erros out with the following
System.ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length
at System.String.InternalSubStringWithChecks(Int32 startIndex, Int32 length, Boolean fAlwaysCopy)
at System.String.Substring(Int32 startIndex, Int32 length)
at CustomerDecrypt.Form1.OutputFileNameDe()
at CustomerDecrypt.Form1.AutoRun()
at CustomerDecrypt.Form1.button1_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
private string path = Path.GetDirectoryName(Application.ExecutablePath);
private void AutoRun()
{
txtBoxDecrypt.Text = path;
string newPath = path.Substring(0, 3);
newPath += "bb.zip.dpa";
MessageBox.Show(newPath);
OutputFileNameDe();
CreateDirectory();
string copyFile = @"C:\!@#$%Encrypted\" + txtBoxDecryptOutputFile.Text + ".dpa";
txtBoxDecrypt.Text = copyFile;
File.Copy(newPath, copyFile, true);
System.IO.FileInfo fileInfo = new System.IO.FileInfo(copyFile);
fileInfo.IsReadOnly = false;
}
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What does OutputFileNameDe( ) do ? That is where the stacktrace is pointing.
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i got it figure out txtboxdecrypt was null, it only held my cd drive letter. thanks to everyone for the help as always.
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Please I want to start automatically my service when I use installutil without start it manually.I set start property in automatic in visual studio but in service explorer I must start service once manually.But after this it's start itself.
Thank you.
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If you set start type to automatic, this means that your service will be started automatically when windows starts, and not when the installutil completes.
If you want to start it after the installutil, you will need to run installutil first, and then run
sc start <your_service_name>Die Energie der Welt ist konstant. Die Entropie der Welt strebt einem Maximum zu.
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You could also try creating a Setup Project where you run code to start your service as a Custom Action.
ServiceController sc = new ServiceController("yourServiceName");
sc.Start();
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Hi, I got round that by adding a line into the projectinstaller.cs file.
(Sorry, I hope I get the formatting right, I am new to contributing to this kind of forum.... and pretty new to C# and programming in general)
After the statement:
Public ProjectInstaller()
{
InitialiseComponent();
}
I Added the following:
public override void Install(IDictionary stateSaver)
{
base.Install(stateSaver);
ServiceController controller = new ServiceCOntroller("//Service Name");
controller.Start();
}
You will also need to add using System.ServiceProcess; at the top of the file.
I hope this helps, it took me a while to find the answer searching google.
It works a treat for me.
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if i have an xml file of the following schema : <users><user><username><password><userpicture><game><gamename>
<played><highscore>
to note that the played part take a value 0 or 1 (false or true) , so if i want to get to the the game part and set the gamename, played and highscore what method should i use (knowing that i have many players)
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1. You haven't shown your XML.
2. IMHO, XML forum would have been a decent choice.
3. Going by the information I have, I would go for XPath."No matter how many fish in the sea; it will be so empty without me." - From song "Without me" by Eminem
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You can start by using a descriptive subject line. XML is not very descriptive of you problem
Next clarify your question
I know the language. I've read a book. - _Madmatt
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<Users><User><Username></Username><Password></Password><UserPicture></UserPicture><Game><GameName>
</GameName><Played></Played><HighScore></HighScore></Game></User></Users>
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Hi All, I need to copy one datagridview to another datagridview .
while I am copying I need also to switch some cells values.
For example , Datagridview1 cell1 should copy to Datagridview2 cell3.
thanks in advance
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| Do you want that any change (after copy) in the grid 1 should be reflected in grid 2 as well? "No matter how many fish in the sea; it will be so empty without me." - From song "Without me" by Eminem
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d@nish, this is what I have done but it is taking long time
to do that if you have thousands of rows then forget it.
that is why I am looking for any convinent way of doing it or not.
for (int j = 0; j < dataGridView1.Rows.Count; j++)<br />
{<br />
dataGridView2.Rows.Add();<br />
for (int i = 0; i < 5; i++)<br />
{<br />
dataGridView2.Rows[dataGridView2.Rows.Count - 1].Cells[i].Value = dataGridView1.Rows[j].Cells[i].Value; <br />
} <br />
}<br />
<br />
Here I have five coloumns for the second for loop.
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hey,
I would need to capture click event when a file is open. for example, when a user click to open a word doc file, do something to the file b4 opening it with ms word.
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| This[^] would give you some idea on this. "No matter how many fish in the sea; it will be so empty without me." - From song "Without me" by Eminem
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i tried the mouse click event on compact framework but the HookManager is giving this error:
The type System.Windows.Forms.MoustEventHandler is defined in an assembly that is not referenced. you must add a reference to assembly Systems.Windows.Forms version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
any solution for compact framework??
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