Re: Coordinates problem - C# Discussion Boards

Re: Help with client-server application that send images to a client

Mbah Dhaim22-May-09 1:13

Mbah Dhaim

22-May-09 1:13

Raquel Barata wrote:
I need to do an client-server application

then you need to start code it.

dhaim
ing ngarso sung tulodho, ing madyo mangun karso, tut wuri handayani. "Ki Hajar Dewantoro"
in the front line gave a lead, in the middle line build goodwill, in the behind give power support

Coordinates problem

Silvyster22-May-09 0:08

Silvyster

22-May-09 0:08

I have two coordinates on the screen x1 and y1 and i have an object at that location.. now i have x2 and y2 which will be the destination point of my object.. I am planning to move my object 1 pixel at a time following the path from x1, y1 to x2, y2.. is there a formula that you can recommend?

Re: Coordinates problem

molesworth22-May-09 0:12

molesworth

22-May-09 0:12

Just work out the ratio of x2 - x1 to y2 - y1, and that will tell you the ratio of pixels to move in x versus y.

If you want reasonably smooth movement you'll need to track positions in floats.

If you want very smooth movement you'll need to take the time per update frame into account.

There are three kinds of people in the world - those who can count and those who can't...

Re: Coordinates problem

Silvyster22-May-09 0:32

Silvyster

22-May-09 0:32

yeah i was asking for the ratio formula

Re: Coordinates problem

molesworth22-May-09 0:51

molesworth

22-May-09 0:51

Try something like :-

float ratio = (float)(x2 - x1) / (float)(y2 - y1);

The casts make sure you don't truncate the result.

There are three kinds of people in the world - those who can count and those who can't...

Re: Coordinates problem

Silvyster22-May-09 1:13

Silvyster

22-May-09 1:13

well actually from what i understand the locations in the C# controls such as a form and a panel are by pixels and of the INT data type. I'm trying to move it pixel by pixel.. I do remember I had a formula taught to me by my math teacher that given the coordinates of both ends of a straight line, you can solve all the POINTS in between.

Re: Coordinates problem

OriginalGriff22-May-09 1:27

OriginalGriff

22-May-09 1:27

What you are looking for is called Bresenham's algorithm
Clickity[^]

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Re: Coordinates problem

molesworth22-May-09 1:38

molesworth

22-May-09 1:38

Silvyster wrote:
from what i understand the locations in the C# controls such as a form and a panel are by pixelsand of the INT data type.

The problem you'll have is that unless you're moving your object exactly along the X or Y direction, or at 45 degrees, you won't have an integer number of pixels in each direction.

What you need to do is something like :-

float ratio = (float)(y2 - y1) / (float)(x2 - x1);    // note : this is dY / dX, not as in previous post

int step = (x2 > x1)? 1 : -1;

float newFloatY = y1;
int newX = x1;

for (int loop=x1; loop!=x2; loop+=step)
{
    newX++;
    newFloatY += ratio;

    int newY = (int)(newFloatY);

    // position object at newX, newY...
}

You'll need to modify it if you want to move by 1 pixel in Y, and cope with special cases like moving exactly horizontally or vertically, but those are "left as an exercise for the reader"... Smile | :)

There are three kinds of people in the world - those who can count and those who can't...

create Timers dynamically

Member 305788721-May-09 23:50

Member 3057887

21-May-09 23:50

Hi,

I am working in windows application in which I need to create Timers dynamically based on number of records in database. I am able to do that but the problem is I can't identify which timer is raising the tick event.
Below is the sample code on which I am working.

public Form1()
{
InitializeComponent();
System.Timers.Timer timer1 = new System.Timers.Timer;
timer1.Enabled = true;
timer1.Interval = 5000;
timer1.Elapsed += new ElapsedEventHandler(TimerTick);
timer1.Start();
}
public void TimerTick(object source, ElapsedEventArgs e)
{
string s = ((System.Timers.Timer)source);
string s1 = e.ToString();
}

Thanks in advance

Re: create Timers dynamically

musefan22-May-09 0:03

musefan

22-May-09 0:03

Hmmm.. i have a feeling your going about this the wrong way...

What are you trying to do with each timer?
There is nothing in your example code that shows you doing anything with the instance of a timer that would need it to be identified

Life goes very fast. Tomorrow, today is already yesterday.

Re: create Timers dynamically

Member 305788722-May-09 0:25

Member 3057887

22-May-09 0:25

Hi Thanks a lot for reoplying so soon

I cant tell the requirement completely. Let me explain in brief.In database I have a set of records in this structure.

ID ConsumerID Time Interval

1 5 5

2 6 7

3 8 9

Now I have 3 records in database. I need to create 3 timers and set intervals accordingly.

For every 5 secs I should get details regarding ConsumerID-5

For every 7 secs I should get details regarding ConsumerID-6

For every 9 secs I should get details regarding ConsumerID-8

Thanks

Re: create Timers dynamically

musefan22-May-09 0:31

musefan

22-May-09 0:31

Ok well you could go with Davey's idea of inheritance or you could use the timer's 'Tag' property as follows...

when creating...

Timer t = new Timer();
//add event handlers and what not
t.Tag = contactID;

then in event handler...

Timer t = (Timer)sender;
if(t.Tag != null)
{
   string contactID = (string)t.Tag;
   //then do some DB stuff to get the contact details use contactID
}

Life goes very fast. Tomorrow, today is already yesterday.

Re: create Timers dynamically

DaveyM6922-May-09 0:43

DaveyM69

22-May-09 0:43

The System.Timers.Timer doesn't have a Tag property - only System.Windows.Forms.Timer - an int ID property for each MyTimer : System.Timers.Timer would be the easiest way to go here.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)

Re: create Timers dynamically

musefan22-May-09 0:46

musefan

22-May-09 0:46

DaveyM69 wrote:
The System.Timers.Timer doesn't have a Tag property

My bad

Yeah, in that case I agree with you method

Life goes very fast. Tomorrow, today is already yesterday.

Re: create Timers dynamically

DaveyM6922-May-09 0:18

DaveyM69

22-May-09 0:18

You can cast to a Timer from the sender

if(sender is System.Timers.Timer)
{
    System.Timers.Timer thisTimer = sender as System.Timers.Timer;
}

If you want you can give it a property such as an int for ID or a string for Name etc by subclassing e.g.

public class MyTimer : System.Timers.Timer
{
    public string Name
    {
        get;
        set;
    }
}

... and then use MyTimer instead of Timer.

Re: create Timers dynamically

Member 305788722-May-09 4:47

Member 3057887

22-May-09 4:47

Thanks a lot Dav I got it by using your method

Re: create Timers dynamically

DaveyM6922-May-09 6:23

DaveyM69

22-May-09 6:23

No problem, you're welcome Big Grin | :-D

Re: create Timers dynamically

mell mell28-Dec-18 6:24

mell mell

28-Dec-18 6:24

hello sir about timer dynamically .can i copy the code? I do not understand how to do it Confused | :confused:

i cant get a class i made- description inside- win app

dinbrca3521-May-09 23:35

dinbrca35

21-May-09 23:35

i have a form:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Din_Checkers
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public Board gameBoard { get; set; }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.Text = "Dins Checkers";
            this.Width = 600;
            this.Height = 600;
            gameBoard = new Board();
            for (int i = 0; i < Board.x_bounds; i++)
            {
                for (int j = 0; j < Board.y_bounds; j++)
                {
                    this.Controls.Add(gameBoard.checkers_board[i, j].checkerCell);
                }
            }
            this.Controls.Add(gameBoard.score);
        }
    }
}

as you can see i have created new Board instance

the Board class is:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Din_Checkers
{
    public class Board
    {
        public const int x_bounds = 8;
        public const int y_bounds = 8;
        public CheckerCell[,] checkers_board { get; set; }
        public Label score = new Label();
        public ImageList imageList1 = new ImageList();
        public int goldEaten = 0;
        public int silverEaten = 0;
        public Image loadGold;
        public Image loadSilver;

        public Board()
        {
            checkers_board = new CheckerCell[x_bounds, y_bounds];
            imageList1.Images.Add(Image.FromFile("Images\\silver.jpg"));
            imageList1.Images.Add(Image.FromFile("Images\\gold.jpg"));
            loadSilver = imageList1.Images[0];
            loadGold = imageList1.Images[1];

            for (int i = 0; i < checkers_board.GetLength(0); i++)
            {
                for (int j = 0; j < checkers_board.GetLength(1); j++)
                {
                    checkers_board[i, j] = new CheckerCell();
                    if (i < 3)
                    {
                        if ((i % 2 == 0 && j % 2 == 0) || (i % 2 == 1 && j % 2 == 1))
                        {
                            checkers_board[i, j].checkerCell.BackgroundImage = loadSilver;
                        }
                    }
                    else if (i > 4)
                    {
                        if (((i + j) % 2 == 0) || (i % 2 == 1 && j % 2 == 1))
                        {
                            checkers_board[i, j].checkerCell.BackgroundImage = loadGold;
                        }
                    }
                    checkers_board[i, j].checkerCell.BorderStyle = BorderStyle.Fixed3D;
                    if ((i % 2 == 0 && j % 2 == 0) || (i % 2 == 1 && j % 2 == 1))
                    {
                        checkers_board[i, j].checkerCell.BackColor = Color.White;
                    }
                    if (checkers_board[i, j].checkerCell.BackColor != Color.White)
                    {
                        checkers_board[i, j].checkerCell.BackColor = Color.Black;
                    }
                    checkers_board[i, j].checkerCell.Top = 30 + 55 * i;
                    checkers_board[i, j].checkerCell.Width = 61;
                    checkers_board[i, j].checkerCell.Height = 53;
                    checkers_board[i, j].checkerCell.Left = 30 + 65 * j;
                }
            }

            score.Top = 510;
            score.Left = 250;
            score.Width = 500;

            for (int i = 0; i < checkers_board.GetLength(0); i++)
            {
                for (int j = 0; j < checkers_board.GetLength(1); j++)
                {
                    checkers_board[i, j].checkerCell.Click += new EventHandler(checkers_board[i, j].ChooseEvent_Click);
                }
            }
        }

        public void DrawScore()
        {
            score.Text = "תוצאה: זהובים אכולים- " + goldEaten.ToString() + " כסופים אכולים- " + silverEaten.ToString();
        }
    }
}

and i have another class (that is used in Board class)- the CheckerCell class:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Din_Checkers
{
    public class CheckerCell
    {
        public PictureBox checkerCell { get; set; }
        public int x = 0;
        public int y = 0;

        public CheckerCell()
        {
            checkerCell = new PictureBox();
        }

        public static void ChooseEvent_Click(object sender, EventArgs e)
        {
            string eventChoose = "";
            for (int i = 0; i < Board.x_bounds; i++)
            {
                for (int j = 0; j < Board.y_bounds; j++)
                {
                    if (eventChoose == "")
                    {
                        if (Form.//Form1.gameBoard.checkers_board[i, j].BackColor == Color.White)
                        {
                            eventChoose = "Handle_Board";
                        }
                    }
                    if (checkers_board[i, j].BackColor == Color.Green)
                    {
                        eventChoose = "move";
                    }
                }
            }
            if (eventChoose == "move")
            {
                MoveChecker_Click(sender, e);
            }
            else
            {
                HandleBoard_Click(sender, e);
            }
        }

        public void HandleBoard_Click(object sender, EventArgs e)
        {
            //אתחול המערך של צבעי הפקדים )למקרה שהייתה לחיצה קודמת על פקד picturebox)
            for (int i = 0; i < Board.x_bounds; i++)
            {
                for (int j = 0; j < Board.y_bounds; j++)
                {
                    if ((i % 2 == 0 && j % 2 == 0) || (i % 2 == 1 && j % 2 == 1))
                    {
                        checkers_board[i, j].BackColor = Color.White;
                    }
                    if (checkers_board[i, j].BackColor != Color.White)
                    {
                        checkers_board[i, j].BackColor = Color.Black;
                    }
                }
            }

            //אימות של איזה מהפקדים במערך checkers_board דומה בתכונותיו לאובייקט sender שהוא אובייקט שהמרתי לפקד picturebox
            for (int i = 0; i < Board.x_bounds; i++)
            {
                for (int j = 0; j < Board.y_bounds; j++)
                {
                    if (checkers_board[i, j] == ((PictureBox)sender))
                    {
                        x = i;
                        y = j;
                    }
                }
            }
            score.Text = x.ToString() + " " + y.ToString() + "fun0"; //הצגה של מיקום הפקד במערך הפקדים

            //בדיקה האם זה לא השכנים של x ו y לא יוצאים מהמערך
            int start_x = x - 1, start_y = y - 1, end_x = x + 1, end_y = y + 1;
            if (start_x < 0)
            {
                start_x = 0;
            }
            if (start_y < 0)
            {
                start_y = 0;
            }
            if (end_x > Board.x_bounds - 1)
            {
                end_x = Board.x_bounds - 1;
            }
            if (end_y > Board.y_bounds - 1)
            {
                end_y = Board.y_bounds - 1;
            }
            for (int i = start_x; i <= end_x; i++)
            {
                for (int j = start_y; j <= end_y; j++)
                {
                    if (checkers_board[i, j].BackColor == Color.White && checkers_board[x, y].BackgroundImage != null && checkers_board[i, j].BackgroundImage != loadGold && checkers_board[i, j].BackgroundImage != loadSilver)
                    {
                        checkers_board[i, j].BackColor = Color.Green;
                    }
                }
            }
        }

        public void MoveChecker_Click(object sender, EventArgs e)
        {
            //אימות של איזה מהפקדים במערך checkers_board דומה בתכונותיו לאובייקט sender שהוא אובייקט שהמרתי לפקד picturebox
            for (int i = 0; i < Board.x_bounds; i++)
            {
                for (int j = 0; j < Board.y_bounds; j++)
                {
                    if (checkers_board[i, j] == ((PictureBox)sender))
                    {
                        x = i;
                        y = j;
                    }
                }
            }

            score.Text = x.ToString() + " " + y.ToString() + "func";
            checkers_board[x, y].BackColor = Color.White;
            checkers_board[x + 1, y - 1].BackColor = Color.White;
            checkers_board[x - 1, y - 1].BackgroundImage = null;
            checkers_board[x, y].BackgroundImage = loadSilver;
            //checkers_board[3, 3].BackgroundImage = Image.FromFile("Images\\silver.jpg");
            //checkers_value[x, y] = "silver-reg";
            //checkers_value[x - 1, y - 1] = "none";
            for (int i = 0; i < Board.x_bounds; i++)
            {
                for (int j = 0; j < Board.y_bounds; j++)
                {
                    if (checkers_board[i, j].BackColor == Color.Green)
                    {
                        checkers_board[i, j].BackColor = Color.White;
                    }
                }
            }
        }

        public void EatChecker()
        {
        }
    }
}

what i want is that CheckerCell Class will be able to access the:
Form1.gameBoard.checkers_board array and i cant success to do it

thanks for the helpers and sorry for my bad english

Re: i cant get a class i made- description inside- win app

musefan21-May-09 23:58

musefan

21-May-09 23:58

you might want to look into events[^]. you can create one for your checkers cell and then to board can listen for that event. and do whatever it needs to then.

Life goes very fast. Tomorrow, today is already yesterday.

datagridview column

michaelgr121-May-09 23:28

michaelgr1

21-May-09 23:28

Hello,
How can i make that the datagrid column displayed index (datagridview1.DisplayIndex) will be equal to the real index (datagridview1.column[name].index)?
I mean for example if i drag-drop a column (reorder column) - the displayindex will be different then the real index? i want the real index (datagridview1.column[name].index) will be changed according the displayindex

Re: datagridview column

Mycroft Holmes21-May-09 23:48

Mycroft Holmes

21-May-09 23:48

michaelgr1 wrote:
i want the real index (datagridview1.column[name].index) will be changed according the displayindex

Why, they do 2 different jobs. If you want to reset the display to the original that is a different matter. Loop through the cols and set the display index = the col index (guess only).

Never underestimate the power of human stupidity
RAH

Re: datagridview column

michaelgr122-May-09 1:42

michaelgr1

22-May-09 1:42

No , i want to opposite thing- the original index will be changed according the displayed index.

Re: datagridview column

Mycroft Holmes22-May-09 2:45

Mycroft Holmes

22-May-09 2:45

Think about what you are asking for, when the user changes the column ordering you want the ORIGINAL index to change. Do you not see the paradox in that requirement.

You could take the display index and (presuming a database source) build a select to reflect the column settings from the user! Then reload the datatable with the new datasource.

Never underestimate the power of human stupidity
RAH

Security "string" encrypt

evangile21-May-09 22:56

evangile

21-May-09 22:56

I have a probleme with c# i can't built anithing i can't hack easy.
evenobfuscate(not pro) will leave the string readable.
i have so hacked (not destruct just for learn security) a lot of c# app they all have thousand way to have fun with.

how to well protect a string??
i tried encrypt it but i'm confused with that since all the crypt function look like.

Decrypt("xxxvmmiti=","MyKeyHERE");

hacker are still able to read the key and its not encrypted so they can use the function + key for decrypt data???
some peaple tell put the key in app.config but that file is even readable in notepad so i don't see any corect way to protect string.

i do something wrong?

so i was thinking call the key from an unmanaged key.dll writed with c++.
is c++ easy to hack? if yes tell me what tool haker use so i can chek.

rigth now i'm thinking use an other langage on sensible part what langage can't be hacked that easy?

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