How do I develop a color palette by passing hexcodes using winforms

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C#

Developing a color palette by passing hex codes using winforms

Posted 19-Apr-15 20:48pm

Member 11497540

Updated 19-Apr-15 21:01pm

Sergey Alexandrovich Kryukov

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Sergey Alexandrovich Kryukov 20-Apr-15 3:01am

What do you mean "how"? By doing appropriate software development work. This is not a real question.
Your post does not provide enough detail on required behavior and does not explain any problems.
What have you tried so far?
—SA

Member 11497540 20-Apr-15 3:26am

In a form i have to load picture boxex dynamically.In tha picture box I have to display colors by passing Hex codes.Instead of picture box we can use button also.

Bjørn 20-Apr-15 4:45am

So what exactly is the problem you're having? Converting HEX codes to a System.Drawing.Color? or creating the PictureBoxes or Buttons dynamically? What have you tried yet?

Member 11497540 20-Apr-15 6:28am

to display that color on that button by passing color is the problem

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Bjørn · Accepted Answer · 2015-04-20T02:03:00

Solution 1

Okay, so, from what I understand, the problem is parsing the HEX color? That's quite easy in C#:

C#

public Color FromHexValue(string value)
{
    // Make sure the alpha is either passed or set to full
    if (value.Length == 6) value = "FF" + value;
    // Convert the hex value to it's int value
    return Color.FromArgb(Convert.ToInt32(value, 16));
}

This example does NOT check for wrong values so be careful to check that first. Like this the method can handle 6 (RRGGBB) or 8 (AARRGGBB) hexadecimal character values like:

FF0000
FFFF0000

Both are the same Color: Red.

I hope that helps.

Best regards!

(\/)
( . .)
c(")(") Bjørn

Posted 20-Apr-15 2:03am

Bjørn

Comments

Member 11497540 21-Apr-15 1:12am

how to make that color display on a button or picturebox?

Member 11497540 21-Apr-15 3:12am

simply i want to develop a colorpalette by passing hex codes.Not the default color dialog color palette.

Bjørn 21-Apr-15 7:59am

You can set the property "BackColor" of the Button like this:

button1.BackColor = Color.Red;

or when using the function above:

button1.BackColor = FromHexValue("FF0000");

Member 11497540 22-Apr-15 4:35am

Thank you very much i got that.But how to apply that button color to a picture.Can you help me plz.

Bjørn 22-Apr-15 7:35am

If you just mean making a PictureBox shoing the color, you can easily set the same property "BackColor":

pictureBox1.BackColor = Color.Red;

If you really want to use a picture (as in using a Bitmap) you'll have to create one manually:

public Bitmap GetColoredBitmap(Color c, int width, int height)
{
Bitmap bmp = new Bitmap(width, height);
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clear(c);
}
return bmp;
}

Then you can set the "Image" property of the PictureBox with that Bitmap. Use the PictureBox's "Width" and "Height" properties to make the Bitmap the same size as the PictureBox:

pictureBox1.Image = GetColoredBitmap(Color.Red, pictureBox1.Width, pictureBox1.Height);

Member 11497540 22-Apr-15 8:29am

I will place many buttons and different colors for that button.If i select a button the colour on that button should be applied to image on picture box.

Bjørn 22-Apr-15 9:00am

When you add a click handler (the one automatically created when you double-click the Button in the designer) you can simply copy the "BackColor" property of the button:

private void button1_Click(object sender, EventArgs e)
{
Color c = button1.BackColor;
pictureBox1.Image = GetColoredBitmap(c, pictureBox1.Width, pictureBox1.Height);
pictureBox1.BackColor = c;
}

You should also set the "BackColor" property of the PictureBox like in the example above because getting the color of the Image is a bit more complicated.

If you're a bit more advanced, you can also assign the same click handler to all buttons like this:

private void ClickHandler(object sender, EventArgs e)
{
Color c = ((Control)sender).BackColor;
pictureBox1.Image = GetColoredBitmap(c, pictureBox1.Width, pictureBox1.Height);
pictureBox1.BackColor = c;
}

The sender is the Button which was clicked. I used a cast to a Control so not only Buttons but any Control types can be used.

Member 11497540 29-Apr-15 2:36am

I have dynamically added all the buttons in colorpalette.If i click on color button and press on one button(corerct) that color should be applied to the image in picture box.