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I'm trying to create an application that rotates an image based on the an angle created by your mouse from a certain point on the form.
I create a form, 500x500, and specify the point to get my angle from at (500,250). From that, everytime the mouse is moved, I grab the current x and y position of the mouse, and then using trig, try to find the angle from the point specified on the form to the mouse. However, I'm not sure if I'm approaching this correctly. Whenever I test my application, the image does rotate, however, it's very "hit-and-miss", and coincidentally, is even quite dodgy in some areas (it wont rotate in certain areas on the form). To rotate the image, I'm using matrices and I haven't had a problem rotating the image using a counter for the angle within a timer; but when I try to use mouse move... well you can only understand where I'm coming from.
Note: I commented out another method I thought off in order to prevent large jumps in the angles, however, it seems to do worse then the other method
private void Form1_MouseMove(object sender, MouseEventArgs e)<br />
{<br />
try<br />
{<br />
<br />
rotationz = true;<br />
angle = (float)((Math.Atan((500 - e.Y) / (250 - e.X))) * (-180 / Math.PI));<br />
Invalidate();<br />
<br />
}<br />
catch (DivideByZeroException)<br />
{<br />
}<br />
}
I'm somewhat of a beginner, so if it is possible to keep it simplified/dumb downed so that it's easier for me to understand, it would be much appreciated! Thanks in advance 
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Does your paint code always rotate the original image, or does it rotate the already rotated image ?
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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it rotates the original image, not the rotated one, so i don't have to subtract the last angle from the current one. I got something working actually, but it's a bit ridiculous, perhaps anyone else could simplify my code?
try<br />
{<br />
<br />
if (e.X > 250 && e.X < lastx)<br />
{<br />
curangle = (int)((Math.Atan((500 - e.Y) / (250 - e.X))) * (-180 / Math.PI));<br />
}<br />
else if (e.X > 250 && e.X > lastx)<br />
{<br />
curangle = (int)((Math.Atan((500 - e.Y) / (250 - e.X))) * (180 / Math.PI));<br />
curangle = -180 - curangle;<br />
}<br />
if (e.X < 250 && e.X < lastx)<br />
{<br />
curangle = (int)((Math.Atan((500 - e.Y) / (250 - e.X))) * (180 / Math.PI));<br />
curangle = 180 - curangle;<br />
}<br />
else if (e.X < 250 && e.X > lastx)<br />
{<br />
curangle = (int)((Math.Atan((500 - e.Y) / (250 - e.X))) * (-180 / Math.PI));<br />
}<br />
<br />
}<br />
catch (DivideByZeroException)<br />
{
For some of those, you'll notice my curangle is touched upon once again within the if statements; I only did that in order to account for both positive and negative rotations left and right. It's kinda long though, so any suggestions would be great  ! Thanks again for the help guys!
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Hello,
I have a MDI parent form that has some children,application requires
that the child form appear only one time and if it is minimized it restores its position if there is any try to open a new instance of it.
I don't know how to let the child form to restore its position after being minimized?
Thanks.
Dad
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First of all at child form try this code:
<br />
this.LocationChanged += new System.EventHandler(this.ChildFormLocationChanged);
and then write:
private void ChildFormLocationChanged(object sender, EventArgs e)<br />
{<br />
if (this.WindowState != FormWindowState.Minimized)<br />
{<br />
x = this.Location.X; <br />
y = this.Location.Y;<br />
}<br />
else <br />
{<br />
MessageBox.Show(x.ToString() + " " + y.ToString());<br />
}<br />
}
Hope, this might help you.
Njoy coding..
Anindya Chatterjee
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Hi All,
Ive been doing alot of ready about backgroud workers and would like to learn how they work and get one into my small simple application i am building. The problem is that i am finding it hard to understand how to get it into my applciation and how they really work. I was wondering if someone could point me in the direction or even give me an example of it working in my code!
bear in mined that i am a beginner to programming, not just C# so any help would be very much appreciated!
My Port Scanner Application:
[Form1.cs]
using System;<br />
using System.Collections.Generic;<br />
using System.Data;<br />
using System.Drawing;<br />
using System.Text;<br />
using System.Windows.Forms;<br />
using System.Net.Sockets;<br />
using System.IO;<br />
<br />
namespace GUI_Port_Scanner<br />
{<br />
public partial class Form1 : Form<br />
{<br />
string _ip;<br />
int _startPort;<br />
int _endPort;<br />
string fileName = "scan_results.txt";<br />
TcpClient TcpScan = new TcpClient();<br />
<br />
public Form1()<br />
{<br />
InitializeComponent();<br />
}<br />
<br />
private void Form1_Load(object sender, EventArgs e)<br />
{<br />
_ip = "";<br />
_startPort = 0;<br />
_endPort = 0;<br />
}<br />
<br />
private void startScanBtt_Click(object sender, EventArgs e)<br />
{<br />
<br />
if (prevItems.Checked == true)<br />
{<br />
listBoxClosed.Items.Clear();<br />
listBoxOpen.Items.Clear();<br />
}<br />
<br />
_ip = hostTxt.Text;<br />
_startPort = Int32.Parse(startPortTxt.Text);<br />
_endPort = Int32.Parse(endPortTxt.Text);<br />
<br />
for (int _currentPort = _startPort; _currentPort <= _endPort; _currentPort++)<br />
{<br />
try<br />
{<br />
TcpScan.Connect(_ip, _currentPort);<br />
listBoxOpen.Items.Add(" => Port " + _currentPort + " is open.");<br />
}<br />
catch<br />
{<br />
listBoxClosed.Items.Add(" => Port " + _currentPort + " is closed.");<br />
}<br />
}<br />
<br />
toFileBtt.Enabled = true;<br />
}<br />
<br />
private void toFileBtt_Click(object sender, EventArgs e)<br />
{<br />
StreamWriter writeTo = new StreamWriter(fileName, true);<br />
if (listBoxOpen.Items.Count != 0)<br />
{<br />
writeTo.WriteLine();<br />
writeTo.WriteLine(" Open Ports:");<br />
writeTo.WriteLine("*-----------------------------*");<br />
}<br />
foreach (object item in listBoxOpen.Items)<br />
{<br />
writeTo.WriteLine(item.ToString());<br />
}<br />
if (listBoxClosed.Items.Count != 0)<br />
{<br />
writeTo.WriteLine();<br />
writeTo.WriteLine(" Closed Ports:");<br />
writeTo.WriteLine("*-----------------------------*");<br />
}<br />
foreach (object item in listBoxClosed.Items)<br />
{<br />
writeTo.WriteLine(item.ToString());<br />
}<br />
writeTo.Close();<br />
}<br />
}<br />
}
[Form1.Designer.cs]
namespace GUI_Port_Scanner<br />
{<br />
partial class Form1<br />
{<br />
private System.ComponentModel.IContainer components = null;<br />
<br />
protected override void Dispose(bool disposing)<br />
{<br />
if (disposing && (components != null))<br />
{<br />
components.Dispose();<br />
}<br />
base.Dispose(disposing);<br />
}<br />
<br />
#region Windows Form Designer generated code<br />
<br />
private void InitializeComponent()<br />
{<br />
this.hostTxt = new System.Windows.Forms.TextBox();<br />
this.startPortTxt = new System.Windows.Forms.TextBox();<br />
this.label1 = new System.Windows.Forms.Label();<br />
this.label2 = new System.Windows.Forms.Label();<br />
this.endPortTxt = new System.Windows.Forms.TextBox();<br />
this.label3 = new System.Windows.Forms.Label();<br />
this.startScanBtt = new System.Windows.Forms.Button();<br />
this.listBoxOpen = new System.Windows.Forms.ListBox();<br />
this.listBoxClosed = new System.Windows.Forms.ListBox();<br />
this.label4 = new System.Windows.Forms.Label();<br />
this.label5 = new System.Windows.Forms.Label();<br />
this.prevItems = new System.Windows.Forms.CheckBox();<br />
this.toFileBtt = new System.Windows.Forms.Button();<br />
this.SuspendLayout();<br />
this.hostTxt.Location = new System.Drawing.Point(72, 12);<br />
this.hostTxt.Name = "hostTxt";<br />
this.hostTxt.Size = new System.Drawing.Size(196, 20);<br />
this.hostTxt.TabIndex = 1;<br />
this.startPortTxt.Location = new System.Drawing.Point(72, 38);<br />
this.startPortTxt.Name = "startPortTxt";<br />
this.startPortTxt.Size = new System.Drawing.Size(65, 20);<br />
this.startPortTxt.TabIndex = 2;<br />
this.label1.AutoSize = true;<br />
this.label1.Location = new System.Drawing.Point(12, 15);<br />
this.label1.Name = "label1";<br />
this.label1.Size = new System.Drawing.Size(32, 13);<br />
this.label1.TabIndex = 3;<br />
this.label1.Text = "Host:";<br />
this.label2.AutoSize = true;<br />
this.label2.Location = new System.Drawing.Point(11, 41);<br />
this.label2.Name = "label2";<br />
this.label2.Size = new System.Drawing.Size(54, 13);<br />
this.label2.TabIndex = 4;<br />
this.label2.Text = "Start Port:";<br />
this.endPortTxt.Location = new System.Drawing.Point(203, 38);<br />
this.endPortTxt.Name = "endPortTxt";<br />
this.endPortTxt.Size = new System.Drawing.Size(65, 20);<br />
this.endPortTxt.TabIndex = 5;<br />
this.label3.AutoSize = true;<br />
this.label3.Location = new System.Drawing.Point(144, 42);<br />
this.label3.Name = "label3";<br />
this.label3.Size = new System.Drawing.Size(51, 13);<br />
this.label3.TabIndex = 6;<br />
this.label3.Text = "End Port:";<br />
this.startScanBtt.Location = new System.Drawing.Point(274, 12);<br />
this.startScanBtt.Name = "startScanBtt";<br />
this.startScanBtt.Size = new System.Drawing.Size(79, 46);<br />
this.startScanBtt.TabIndex = 7;<br />
this.startScanBtt.Text = "Scan";<br />
this.startScanBtt.UseVisualStyleBackColor = true;<br />
this.startScanBtt.Click += new System.EventHandler(this.startScanBtt_Click);<br />
this.listBoxOpen.BackColor = System.Drawing.SystemColors.MenuText;<br />
this.listBoxOpen.Font = new System.Drawing.Font("Arial", 9.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));<br />
this.listBoxOpen.ForeColor = System.Drawing.Color.LimeGreen;<br />
this.listBoxOpen.FormattingEnabled = true;<br />
this.listBoxOpen.ItemHeight = 16;<br />
this.listBoxOpen.Location = new System.Drawing.Point(12, 104);<br />
this.listBoxOpen.Name = "listBoxOpen";<br />
this.listBoxOpen.Size = new System.Drawing.Size(168, 164);<br />
this.listBoxOpen.TabIndex = 8;<br />
this.listBoxClosed.BackColor = System.Drawing.SystemColors.MenuText;<br />
this.listBoxClosed.Font = new System.Drawing.Font("Arial", 9.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));<br />
this.listBoxClosed.ForeColor = System.Drawing.Color.DarkRed;<br />
this.listBoxClosed.FormattingEnabled = true;<br />
this.listBoxClosed.ItemHeight = 16;<br />
this.listBoxClosed.Location = new System.Drawing.Point(186, 104);<br />
this.listBoxClosed.Name = "listBoxClosed";<br />
this.listBoxClosed.Size = new System.Drawing.Size(167, 164);<br />
this.listBoxClosed.TabIndex = 9;<br />
this.label4.AutoSize = true;<br />
this.label4.Location = new System.Drawing.Point(14, 88);<br />
this.label4.Name = "label4";<br />
this.label4.Size = new System.Drawing.Size(63, 13);<br />
this.label4.TabIndex = 10;<br />
this.label4.Text = "Open Ports:";<br />
this.label5.AutoSize = true;<br />
this.label5.Location = new System.Drawing.Point(188, 88);<br />
this.label5.Name = "label5";<br />
this.label5.Size = new System.Drawing.Size(69, 13);<br />
this.label5.TabIndex = 11;<br />
this.label5.Text = "Closed Ports:";<br />
this.prevItems.AutoSize = true;<br />
this.prevItems.Location = new System.Drawing.Point(73, 65);<br />
this.prevItems.Name = "prevItems";<br />
this.prevItems.Size = new System.Drawing.Size(122, 17);<br />
this.prevItems.TabIndex = 13;<br />
this.prevItems.Text = "Clear Previous Items";<br />
this.prevItems.UseVisualStyleBackColor = true;<br />
this.toFileBtt.Enabled = false;<br />
this.toFileBtt.Location = new System.Drawing.Point(274, 61);<br />
this.toFileBtt.Name = "toFileBtt";<br />
this.toFileBtt.Size = new System.Drawing.Size(79, 23);<br />
this.toFileBtt.TabIndex = 14;<br />
this.toFileBtt.Text = "Copy to File";<br />
this.toFileBtt.UseVisualStyleBackColor = true;<br />
this.toFileBtt.Click += new System.EventHandler(this.toFileBtt_Click);<br />
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);<br />
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;<br />
this.ClientSize = new System.Drawing.Size(365, 347);<br />
this.Controls.Add(this.toFileBtt);<br />
this.Controls.Add(this.prevItems);<br />
this.Controls.Add(this.label5);<br />
this.Controls.Add(this.label4);<br />
this.Controls.Add(this.listBoxClosed);<br />
this.Controls.Add(this.listBoxOpen);<br />
this.Controls.Add(this.startScanBtt);<br />
this.Controls.Add(this.label3);<br />
this.Controls.Add(this.endPortTxt);<br />
this.Controls.Add(this.label2);<br />
this.Controls.Add(this.label1);<br />
this.Controls.Add(this.startPortTxt);<br />
this.Controls.Add(this.hostTxt);<br />
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;<br />
this.Name = "Form1";<br />
this.Text = "Input | Output - Port Scanner";<br />
this.Load += new System.EventHandler(this.Form1_Load);<br />
this.ResumeLayout(false);<br />
this.PerformLayout();<br />
<br />
}<br />
<br />
#endregion<br />
<br />
private System.Windows.Forms.TextBox hostTxt;<br />
private System.Windows.Forms.TextBox startPortTxt;<br />
private System.Windows.Forms.Label label1;<br />
private System.Windows.Forms.Label label2;<br />
private System.Windows.Forms.TextBox endPortTxt;<br />
private System.Windows.Forms.Label label3;<br />
private System.Windows.Forms.Button startScanBtt;<br />
private System.Windows.Forms.ListBox listBoxOpen;<br />
private System.Windows.Forms.ListBox listBoxClosed;<br />
private System.Windows.Forms.Label label4;<br />
private System.Windows.Forms.Label label5;<br />
private System.Windows.Forms.CheckBox prevItems;<br />
private System.Windows.Forms.Button toFileBtt;<br />
}<br />
}<br />
Also any critisism on any other aspect of the program would be great, along with tips and tricks
Thank you very much!
Relentless.
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Threading is a complex concept to handle early on.
Never post your designer.cs file, the IDE generates that.
I see no progress bar or threading code here. Use the BackgroundWorker class, it's really easy, and it has a report progress event you can use to run a progress bar.
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Thanks for the quick reply,
Noted about the designer.cs file and i have not put any background worker or progress bar in yet, i will do some more research then and get back to you.
Thanks again,
Relentless.
Knowledge is Power.
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Here are a selection of links which helped me learn about threading.
What I would say is don't let what seems like a complex area put you off learning about threading(the basics are just that - basic).
Threading is a basic requirement for decent user interfaces - running processes in the background while allowing the user to still access a form.
Jump in and have fun:
Codeproject threading demonstration
Good General Tutorial on threading
Codeproject sync async threads
Regards
Guy
Continuous effort - not strength or intelligence - is the key to unlocking our potential.(Winston Churchill)
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Thank you very muc for your quick replys,
So far i understand that i will need to create a function that will initialize the background worker, i will then need to put the code i want it to do in the background i.e:
for (int _currentPort = _startPort; _currentPort <= _endPort; _currentPort++)<br />
{<br />
try<br />
{<br />
TcpScan.Connect(_ip, _currentPort);<br />
listBoxOpen.Items.Add(" => Port " + _currentPort + " is open.");<br />
}<br />
catch<br />
{<br />
listBoxClosed.Items.Add(" => Port " + _currentPort + " is closed.");<br />
}<br />
}
That is as far as i have got thanks a lot for the resorces i will keep reading and playing around with the code. Still a bit confusing.
Relentless.
Knowledge is Power.
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One important point - you can't manipulate UI stuff in the thread, you need instead to send messages to the Progress event, which runs on the main thread, and can update your UI.
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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OK thanks again,
Will have to do a lot more reading  thanks again.
Relentless.
Knowledge is Power.
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*grin* yeah, there's a number of threading classes, BackgroundWorker definately is the one that makes everything easy for you
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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I have a list and I wish to print the list to the screen or a form in a windows application.
In a console application, I would do it as follows:
foreach ( )
console.Writeline();
I have tried using MessageBox and it shows the list output, but that is not what I want. I want to have the output appear line by line (similar to writeline) and also well formatted.
Could someone point me in the right direction?
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You could use a ListBox and append the items from the list into the ListBox.
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Ok Thanks, I will try that. Althought I would think that <cr> might be a problem
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Jerry Graham,
Label listLabel = new Label();
listLabel.Location = new Point(10, 10);
listLabel.AutoSize = true;
foreach (string item in theList)
{
listLabel.Text += item + Environment.NewLine;
}
form.Controls.Add(listLabel);
Something like that?
Regards,
Gareth.
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Hello,
I'm wondering how to go about getting the mouse cursor position relative to a child window in a given windows application. I'm writing an application that is interested in this data.
Example: The user clicks a button in some winforms app, and my application uses low level hooks (or some other strategy) to determine the mouse coordinates relative to the clicked button in the other application.
Any thoughts on how to proceed? I'm hooking the mouse so I get the screen coordinates when the mouse is clicked, but I'm not sure how to get position (relative or absolute) of the control that generated the "click" event.
Thanks!
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You can get screen co-ordinates and do the conversion yourself, it's pretty straightforward, just get the position of the window in question.
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Yeah, I guess my question is really how to get the position of a child window that generated the event (where the child window is running in a separate application from the code that is interested in its position). I see that Spy++ is able to identify the positions of child windows, I just don't know what APIs are being used.
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Snippet:
protected override void OnStart(string[] args)<br />
{<br />
try<br />
{<br />
Log("Service Starting");<br />
<br />
serviceThread = new Thread(new ThreadStart(runThread));<br />
serviceThread.Start();<br />
}<br />
catch(Exception ex)<br />
{<br />
Log("Error: " + ex.Message);<br />
}<br />
}<br />
<br />
protected override void OnStop()<br />
{<br />
Log("Service Stopping");<br />
serviceThread.Abort();<br />
}<br />
<br />
private void runThread()<br />
{<br />
Log("Service Thread Running");<br />
while(true)<br />
{<br />
DCNAuditProcessor.DoCheck();<br />
Thread.Sleep(waitTime);<br />
}<br />
}
The runThread Method never runs. The service starts succussfully, but this code is never executed. The Serivce Starting notification and Service Stopping notification is succcessfully logged to a log file, but never the Service Thread Running.
I have reviewed the event logs and there are no errors.
Any ideas would be appreciated.
-Thanks
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I dunno, I don't spot any glaring problems in what you posted.
Does the list of Services show it as Running?
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