Re: A Paint like application (MODIFIED) - C# Discussion Boards

Re: A Paint like application

17-Apr-09 4:37

Hello friends..
I came accross a small problem. I need to draw something e.g. rectangles, circles, ellipses ,etc.
I read the articles and learnt how to draw them , but as we can see the rectangle with a broken border as in paint until and unless we release the mouse , I am unable to do such in my application...

Please help...

Rob Philpott17-Apr-09 4:52

Rob Philpott

17-Apr-09 4:52

Dude, I think you need to rephrase that. I really can't understand what you want to say.

Regards,
Rob Philpott.

jaypatel51217-Apr-09 4:58

17-Apr-09 4:58

if we need to draw a rectangle in a picture box we can do so easily..

on mouse down event i save the mouse cordinates.
And on mouse up event i can draw a rectangle using the pointer position...

All works fine. .

But actually if you do such in paint, you can see a rectangle being drawn as we move our mouse ...

How to doso ??

dan!sh 17-Apr-09 5:23

dan!sh

17-Apr-09 5:23

You need to draw the rectangles in MouseMove event as well along with Paint. (If I understood you correctly.)

जय हिंद

jaypatel51217-Apr-09 20:48

17-Apr-09 20:48

You got it correct. ..

I have already done that, but what happens is once a rectangle is drawn with mouse move event , I am unable to remove it..

Thats the main problem ..

Rob Philpott17-Apr-09 5:23

Rob Philpott

17-Apr-09 5:23

Ah ok,

On the mouse down event, set a boolean to true. In the mouse up event, set it to false. In the Mouse move event, check the boolean and if its true then draw the rectangle.

That should do what you want.

Regards,
Rob Philpott.

Henry Minute17-Apr-09 8:32

17-Apr-09 8:32

The answers already given will work.

For some added 'cool' features Google for 'rubberbanding c#', and search MSDN for DrawReversibleFrame the page that you get has a nice example.

Good Luck! Smile | :)

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

jaypatel51217-Apr-09 21:01

how to add items in a list box from database

17-Apr-09 21:01

This was it that i want. . .
Rubberbanding. . I was unaware of that word..

Thanx anyway dude .

kaushik_dass17-Apr-09 3:57

kaushik_dass

17-Apr-09 3:57

i am trying to fetch data from database & trying it to add all the fetch records into listbox

cmd = new OleDbCommand("select bcode from Issue where btno= " + listBox1.SelectedItem.ToString() + "", cn);
cn.Open();
dr = cmd.ExecuteReader();
if (dr.Read() == true)
{

listBox2.Items.Add(dr[0].ToString());

}
dr.Close();
cn.Close();
so it only adds a single record but there are more than one records matches to btno

Re: how to add items in a list box from database

N a v a n e e t h17-Apr-09 4:00

N a v a n e e t h

17-Apr-09 4:00

mosya_k2 wrote:
if

while

Navaneeth

How to use google | Ask smart questions

Re: how to add items in a list box from database

Henry Minute17-Apr-09 4:02

Mouse Coordinates of a bitmap form in the main window

17-Apr-09 4:02

The problem is that you are only telling it to add one item.

Replace:

if (dr.Read() == true)

with:

while (dr.Read())

and all should work as required.

Incidentally, you should have posted this as a reply to musefan. He was waiting to help you. He's probably sitting in front of his computer crying now, because you haven't replied! Smile | :)

sebogawa17-Apr-09 3:44

sebogawa

17-Apr-09 3:44

I have the mouse event handler function that takes the mouse x and y coordinates and converts that integer to a string and is sent to two text boxes, one for each axis. I am trying the get the x and y coordinates of the mouse when it is on any part of a live video stream bitmap. It is for a color tracking app, ill eventually get the color ARGB values of the pixel the mouse is over and save it to the color filter value chart. I digress, all i need to know is where do i have to place my function:

protected override void OnMouseMove(MouseEventArgs mouseEv)
{
txtMouseX.Text = mouseEv.X.ToString();
txtMouseY.Text = mouseEv.Y.ToString();
}

so that i get the coordinates of the bitmap, not the application window.

modified on Friday, April 17, 2009 10:06 AM

Henry Minute17-Apr-09 4:08

17-Apr-09 4:08

If you put the Bitmap on the window, you should know its coordinates. Keep your code where it is but put a test before your existing code to see if the mouse is in the rectangle for the image. If not in the rectangle, return. Then just add offsets to your two lines for the X and Y coordinates of the image.

sebogawa17-Apr-09 4:14

sebogawa

17-Apr-09 4:14

The issue is that I stop receiving coordinates when the mouse enters the bitmap rectangle due to the fact that it is part of a form group. How do i get rid of the border that separates the bitmap and text boxes from the rest of the application window.

Henry Minute17-Apr-09 4:20

17-Apr-09 4:20

sebogawa wrote:
due to the fact that it is part of a form group

I do not understand. What, exactly, is a form group? Do you mean that the image is on one form, and the TextBoxes are on another?

If not, then please clarify.

sebogawa17-Apr-09 4:28

sebogawa

17-Apr-09 4:28

Ill try my best to explain. So imagine a simple form window. It has a black rectangle, thats the video feed bitmap thing, then it has two text boxes. The bitmap rectangle and the text boxes are surrounded by a border that groups then under a specific title. I got the color filtering code from the "Lego Pan and Tilt with color tracking" app posted on this site. The mouse coordinates only change value in the textboxes when the mouse is outside the group border, but still inside the main window. If u look up the Lego app u will see what i am talking about in the images posted with that article. Everthing in the picture is the same except for two text oxes under the bitmap rectangle. Thanks for healping : )

Henry Minute17-Apr-09 4:46

How to add items in listbox from database

17-Apr-09 4:46

sebogawa wrote:
thats the video feed bitmap thing

And is the 'bitmap thing' actually a control?

If it is, then in the designer, select it, in the Properties Window, switch to Events page and double click on the MouseMove event. Put your code in the handler stub created in the code view for the form, should work OK, no need for offsets etc..

kaushik_dass17-Apr-09 3:27

kaushik_dass

17-Apr-09 3:27

i tried to add the items in listbox from database but it adds only one record from database

Re: How to add items in listbox from database

musefan17-Apr-09 3:36

musefan

17-Apr-09 3:36

how did you try to do it? post some example code

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

Re: How to add items in listbox from database

PauloCastilho17-Apr-09 12:38

PauloCastilho

17-Apr-09 12:38

Try to use this two properties: DataValueField and DataTextField.
e.g.

<br />
//SOURCE_FROM_DB -> The method or object or ... whatever ... that has the items.<br />
myListBox.DataSouce = SOURCE_FROM_DB;<br />
//VALUE_COLUMN_NAME -> The column name of the DataSource that represents the VALUE of the item.<br />
myListBox.DataValueField = "VALUE_COLUMN_NAME";<br />
//TEXT_COLUMN_NAME -> The column name of the DataSource that represents the TEXT of the item.<br />
myListBox.DataTextField = "TEXT_COLUMN_NAME";<br />
myListBox.DataBind();<br />

How understand Dataset changes ?

Coban_17-Apr-09 3:22

Coban_

17-Apr-09 3:22

Hi all, I have a dataset which I have designed in database designer. I have desinged a form with drag drop datasources. So there is a navigator. If I change some textboxt value etc.. at run time, When I had pressed buttons on navigator (Next, Previous, First or Last) before I saved. , Can it give a message that is
"There are some changes. Do you want to save ??"

How can I understand cahnges on dataset at runtime ??

Thanks all

S.A.A

Creating a Help Form

caksabre217-Apr-09 3:14

caksabre2

17-Apr-09 3:14

Hello,

I really want to create a help page in my C# windows application and was wondering if anyone has any recommendations on best practice for this.

Cheers,

Chris

Re: Creating a Help Form

Henry Minute17-Apr-09 4:11