PLEASE HELP! how do i change the color of a pattern?

[armedrabbit]

Hi how can i change the color of my pattern, this is the code i have so far

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

public class Pattern extends JComponent
{
public static final int GRID_SIZE = 20;
public static final int ROWS = 10;
public static final int COLUMNS = 10;

public boolean fill(int row, int column)
{
// Change the Boolean expression to produce different patterns
return !(row == 0 && column == 0 || row == 1 && column == 0 || row == 2 && column == 0 || row == 3 && column == 0 || row == 4 && column == 0 || row == 5 && column == 0 || row == 6 && column == 0 || row == 7 && column == 0 || row == 8 && column == 0 || row == 9 && column == 0 || row == 0 && column == 3 || row == 1 && column == 3 || row == 2 && column == 3 || row == 3 && column == 3 || row == 4 && column == 3 || row == 5 && column == 3 || row == 6 && column == 3 || row == 7 && column == 3 || row == 8 && column == 3 || row == 9 && column == 3);

}

public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.RED);
Pattern pattern = new Pattern();
for (int i = 0; i < ROWS; i++)
for (int j = 0; j < COLUMNS; j++)
if (pattern.fill(i, j))
g2.fill(new Rectangle(
j * GRID_SIZE,
i * GRID_SIZE,
GRID_SIZE - 1,
GRID_SIZE - 1));
}

public Dimension getPreferredSize()
{
return new Dimension(GRID_SIZE * COLUMNS,
GRID_SIZE * ROWS);
}

public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.add(new Pattern());
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);
frame.setVisible(true);
}
}



How do i change it so that the clear part would turn green, instead of it being clear. That way i can create a christmas color pattern? please help, im very new to java and im really stressing to figure it out

[Junky]

You need to provide more details. I for one have no idea what you are talking about.

[armedrabbit]

You need to provide more details. I for one have no idea what you are talking about.

okay im sorry!

what i mean to say is when i run this program it prints a pattern of red and clear. what i want it to print is a pattern of red and green, how can fix my program so it does that?

[Junky]

Taking a stab in the dark here:

loop {
    loop {
        if ..... {
            set color to red
            draw rectangle
        } else {
            set color to green
            draw rectangle
        }
    }
}

[armedrabbit]

im so bad with if statements =/. is there way to just set my boolean method colors to green?

[Junky]

Huh?

You already have the if statement in your code to do the red rectangles. Simply add the else statement to do the green rectangles.

[armedrabbit]

so would i use the else statement after my for statement
like this

for (int i = 0; i < ROWS; i++)
for (int j = 0; j < COLUMNS; j++)
if (pattern.fill(i, j))
g2.fill(new Rectangle(
j * GRID_SIZE,
i * GRID_SIZE,
GRID_SIZE - 1,
GRID_SIZE - 1));
else

[DarrylBurke]

The if-then and if-then-else Statements (The Java™ Tutorials > Learning the Java Language > Language Basics)

db

[Junky]

so would i use the else statement after my for statement

No, after the if statement.

Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.RED);  // delete this line
Pattern pattern = new Pattern();
for (int i = 0; i < ROWS; i++) {
    for (int j = 0; j < COLUMNS; j++) {
        if (pattern.fill(i, j)) {
            // set colour
            g2.fill(new Rectangle(j * GRID_SIZE, i * GRID_SIZE, GRID_SIZE - 1, GRID_SIZE - 1));
        } else {  // add else here

        }
    }
}

By the way I strongly urge you to always use brackets around loops and if statements.

[armedrabbit]

nvm i got it! thank you!