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colors RGB

Posted on 2004-10-09
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Last Modified: 2010-03-31
hi experts,

the only way I know to use colors is to say for example Color.white which doesn't have much range. I know there is some way to set colors using RGB or if you suggest a better way

please include example

thanks
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Question by:Samooramad
5 Comments
 
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TrekkyLeaper earned 50 total points
ID: 12268389
You can create Color objects using the other constructors. For example:

float r = <red value from 0 - 1.0>;
float g = <green value>;
float b = <blue value>;
Color myColor = new Color( r, g, b );

You can also do this with the standard 0-255 integers and numerous other ways. See the javadocs for the other constructors:

http://java.sun.com/j2se/1.4.2/docs/api/java/awt/Color.html
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by:sudhakar_koundinya
sudhakar_koundinya earned 50 total points
ID: 12268450
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by:shah1d1698
shah1d1698 earned 50 total points
ID: 12271013
try this...

import java.awt.*;
import javax.swing.*;

class ABC extends JFrame
{
  public ABC()
  {
        Container con = getContentPane();
        setVisible(true);
      setSize(500, 500);
  }

  public void paint(Graphics g)
  {
       g.setColor(new Color(255, 0, 0));//complete red
       g.drawLine(0, 0, 300, 100);
      
       g.setColor(new Color(0, 255, 0));//complete green
       g.drawLine(0, 0, 300, 200);
      
       g.setColor(new Color(0, 0, 255));//complete blue
       g.drawLine(0, 0, 300, 300);
      
        g.setColor(new Color(255, 255, 255));//white
        g.drawLine(0, 0, 300, 400);
      
        g.setColor(new Color(0, 0, 0));//black
        g.drawLine(0, 0, 300, 450);

     //i.e, u can use the format new Color(red, green, blue)
     //where red, green, blue are in the range of 0 to 255.
    //U can use any combination of these to create your
    //own color. For example-

      g.setColor(new Color(95, 50, 150));
      // here ratio of blue will be
      //greater than the others.
      g.drawLine(0, 0, 300, 500);

  }

  public static void main(String[] aaaa)
  {
    ABC abc = new ABC();
    abc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }

}
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Assisted Solution

by:phavardel
phavardel earned 50 total points
ID: 12271989
There are several options contained within the Color class. I find the simplest option:

public Color(int red, int green, int blue)

where each int is a value between 0-255. Not only is this clean, but you can use your graphics software (even just MS Paint) to find a good color and it'll tell you the RGB value for it.

For example, paint tells me that a deep purple is red=174, green=56, blue=199. So, all you'd need to do is say

Color deepPurple = new Color(174, 56, 199);

and then just reference the variable whenever you want that color (i.e. g.setColor(deepPurple))

Other options include:

Color(int rgb) where all the weights are stored in a single integer variable, red being bits 23 downto 16, green 15 downto 8, and blue 7 downto 0

Color(float r, float g, float b) - similar to the int one I used above, but instead each value is between 0.0 and 1.0


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Author Comment

by:Samooramad
ID: 12273017
thanks everyone you were very helpful
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