draw a fill circle on PictureBox

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in my project i have to when i click on the star show the name of the star. the solution is to draw the star on the PictureBox and them draw this PictureBox .and when i click in the star i click in the PictureBox(object) and show the name.
N.B: i have to draw more than 1000 star. for each star i want to show the name.

Posted 11-Jan-14 5:40am

Bakhos Sayssouk

Updated 8-Feb-17 8:57am

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CHill60 11-Jan-14 11:43am

This doesn't make a lot of sense. What have you tried and what is the problem?

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OriginalGriff · Answer 1 · 2014-01-11T05:50:00

Solution 1

Drawing a filled circle is easy: just get the Image control from your picturebox and use the FillEllipse method:

C#

Image i = myPictureBox.Image;
using (Graphics g = Graphics.FromImage(i))
    {
    g.FillEllipse(Brushes.White, new Rectangle(100, 100, 10, 10));
    }

When you have drawn them, just call myPictureBox.Invalidate() to display them all.
If I was you, I'd create a Star class which included it's name, location, and (display) size, so you could then look for it when you clicked on the picturebox.

Posted 11-Jan-14 5:50am

OriginalGriff

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Bakhos Sayssouk 11-Jan-14 14:49pm

noo. in one step(in boocle for),i want to create a PictureBox(picturebox[] p=new picturebox[i]).and to draw at the picturebox a circle,tham to set the picture.

OriginalGriff 12-Jan-14 4:25am

You do not want to do that: one PictureBox per star?
That's like drawing a house by painting each brick on a separate piece of paper, then glueing them all together...
Do you have any idea how many window handles that will use up? :OMG:

Bakhos Sayssouk 11-Jan-14 15:17pm

or i can draw a circle fill object wen i click to the circle(star) show the star name ??? thank you in advance.

OriginalGriff 12-Jan-14 4:28am

Depends - if you use one picture box, and keep each star separate (and holding a rectangle describing it's size and position relative to the TLHC of the image as well as it's name) then it's a fairly simple operation to find out which star's rectangle you clicked in from the PictureBox.Click event handler. Then all you have to do is show the name from the star class info.

Bakhos Sayssouk 12-Jan-14 10:26am

yes one PictureBox per star.i have a name of the star on xml.

OriginalGriff 12-Jan-14 10:40am

Don't use one picturebox per star! That is a truly horrible way to do it - slow, inefficient, and liable to crash your program... Use one picture box for them all, and draw them on that.
Trust me on this...

Bakhos Sayssouk 12-Jan-14 10:53am

ok. but houw i can when i click on the star show the name of the star??

OriginalGriff 12-Jan-14 11:26am

It's not difficult: remember where I said to create a class that held the name location and display size?
If you hold the location and display size as a Rectangle, you can use the PictureBox.MouseClick event to decide which star you are in by using the MouseEventArgs parameter: it provides you the X and Y coordinate relative to the TLHC of the PictureBox.
You can them look at each Star class instance, and use the Rectangle.Contains method to check if the point is inside or outside. I'd add a method to the Star class:
public bool IsAt(int x, int y)
{
return location.Contains(x, y);
}
You then know the Star instance, which contains the name.

[no name] 8-Feb-17 19:08pm

Remember when I bragged about my little game map? I must have a few hundred billion stars per galaxy in about 4 billion galaxies in about 4 billion universes. Surely it's ok if I use some picture boxes and labels to display that?

Bakhos Sayssouk 12-Jan-14 10:55am

how**

avisal · Answer 2 · 2017-02-08T08:57:00

Solution 2

or Graphics g = pictureBox1.CreateGraphics();
etc

Posted 8-Feb-17 8:57am

avisal