我如何计算从pictureBox1的顶部到form1的顶部的距离？

Question

I have a label with text inside i can change the label size or the label font size each time and check many times but maybe there is a way to calculate it:

label18.Text = "מכם מזג האוויר איננו פעיל כרגע";

This is how i see the text now:

The text in red is in hebrew this is the text i want to change it's size and also to put it in the middle according to the picturebox1 top not on the left like it is now.

And i did a black circle just to show what i mean by " the distance from the top of pictureBox1 and almost the top of form1 ". I mean this gray area from the above the pictureBox1 and the form1 white area on the top only this gray area i want to make the text in this height and in the middle. How can i calculate this two values ?

I tried this but it's not in the exact middle:

SizeF size = label18.CreateGraphics().MeasureString(label18.Text, label18.Font);
label18.Left = (pictureBox1.Width / 2) - (((int)size.Width) / 2) + pictureBox1.Left;
label18.Top = pictureBox1.Top - 20;

Answer 1

You don't need graphics or to measure anything. Just set in designer text align = middlecenter and autosize = true

label18.Location = new Point(pictureBox1.Location.X + (pictureBox1.Width / 2 - label18.Width / 2, 
                             pictureBox1.Location.Y - label18.Height);

Answer 2

To center a label you need it get it actual size, then to center it using another control use some simple math to get the coordinate for the control (see below Example 1). I don't know what control the grey bar is but you could center in that by using the size.Width property and doing the same type of calculation.

If you want to fill the grey bar I have added Example 2.

Example 1:

private void CenterLabel()
{
    //get the size of the text (you could do this before hand if needed)
    SizeF size = label18.CreateGraphics().MeasureString(label18.Text, label18.Font);

    //center over picture box control and slightly above
    label18.Left = (pictureBox1.Width / 2) - (((int)size.Width) / 2)  + pictureBox1.Left;
    label18.Top = pictureBox1.Top - 20;
}

Example 2

private void CenterLabel()
{
    int fontHeightPixels = (int)(greyBar.Height * .85);
    Font font = new System.Drawing.Font("Arial", fontHeightPixels, FontStyle.Regular, GraphicsUnit.Pixel);

    string text = "I am centered";

    //get the size of the text (you could do this before hand if needed)
    SizeF size = label18.CreateGraphics().MeasureString(text, font);

    label18.Font = font;
    label18.Text = text;

    //center over picture box control and slightly above
    label18.Left = (pictureBox1.Width / 2) - (((int)size.Width) / 2) + pictureBox1.Left;
    label18.Top = (greyBar.Height / 2) - (((int)size.Height) / 2) + greyBar.Top;            
}

Answer 3

This is relatively simple with Windows forms:

1. Dock your label to the top of the form by setting the appropriate property in the Forms designer. The property you want to set is Dock and it should be set to Top .
2. Change the label's AutoSize property to false .
3. Change the label's height as desired.
4. Change the label's TextAlign property to MiddleCentre .

That should do it.

Answer 4

There's more then one way to achieve this goal.

I would suggest the following:

1. First calculate the width of the picturebox (picturebox.Width)
2. Find the coordinates on the form where the picturebox resides (picturebox.Location) property of the picturebox)
3. Then you change the location of your label control --> to Label.Location.X = (picturebox.Width /2) and Label.Location.Y = picturebox.Location.Y ==> now you have the label correctly placed .
   4. Next Set the Height of the Label Control to the Top(distance between the edge of the form and picturebox) value of the Picturebox.

No visual studion from where i am typing so cannot do full code example.

You're done.