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Thread: How to setColor with a for loop?

  1. #1
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    Default How to setColor with a for loop?

    Hello!

    So i'm learning to draw simple graphics with Java... I drew a pie chart using fillArc(.....) and splitted the pie in 8 equal pieces with an angle of
    45 each...

    I want each slice to have a different color... I was able to do it using a switch case but then i tried to make the code smaller using a
    String array with the color names like this:

    String sliceColor[] = {"GREEN","ORANGE","BLUE", etc...} 8 color names

    and then i used a for loop to draw the 8 filled arcs... but the problem is that i can't change the colors in the loop for each slice using
    setColor(Color.sliceColor[loop variable here]); this is where i'm stuck... any way to change to a different color using the loop?

    Here's the code so far...

     
    //--------------------------------------------
    // A Pie chart drawing with 8 slices of 
    // 45 degrees each and different colors.
    //--------------------------------------------
     
    import javax.swing.JApplet;
    import java.awt.Graphics;
    import java.awt.Color;
     
    /*
    <applet code = "PieChart" width =1200 height = 650> </applet>
    */
     
    public class PieChart extends JApplet
    {
       public static final short ARC_ANGLE = 45; //angle constant
     
       //pie slice color array - 8 colors
       String sliceColor[] = {"GREEN","BLACK","ORANGE","WHITE","RED",
       "YELLOW","BLUE","CYAN"};
     
       public void init()
       {
          setBackground(Color.BLACK);
       }
     
       public void paint(Graphics pie)
       {      
          short startAngle = 0;
          for (short sliceNumber = 0;sliceNumber < 8; sliceNumber++)
          {
             pie.setColor(Color.sliceColor[sliceNumber]);  <---------------- this is what i want to make it work  :confused:
             pie.fillArc(300,60,500,500,startAngle,ARC_ANGLE);
             startAngle += 45;
     
          } // end for loop
     
       } // end paint class
     
    } // end PieChart class.

    Thanks...
    Last edited by Ricardo10; July 16th, 2019 at 08:48 PM. Reason: formatting

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: How to setColor with a for loop?

    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.

    Also please copy the full text of any error messages and paste it here.

    way to change to a different color using the loop?
    Define an array of Color objects and index into it the same way code indexes into the array of Strings.
    The Color class has several static fields that define Color objects. For example: Color.RED
    Read the API doc for the Color class to see what fields it has.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    Ricardo10 (July 17th, 2019)

  4. #3
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    Default Re: How to setColor with a for loop?

    Norm... An example would have been great... but after some digging around i did this:

     //setting color array
       Color[] nextColor = 
       {Color.GREEN,Color.BLUE,Color.RED,Color.GRAY,Color.CYAN,
       Color.ORANGE,Color.WHITE,Color.YELLOW};

    and then used the array like this:
       pie.setColor(nextColor[sliceNumber]);


    and it worked...

    Thanks for the reply.

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