Notes

/*
* Kevin Li
* Daniel Zhu
*/

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;

import javax.swing.JComponent;
import java.lang.Math;

public class Flag extends JComponent {
private int FLAG_WIDTH;
private int FLAG_HEIGHT;

private final int STRIPES = 13;
private final double B = 1.9;
private final double C = 7.0 / STRIPES;
private final double D = 0.76;
private final double E = 0.054;
private final double F = 0.054;
private final double G = 0.063;
private final double H = 0.063;
private final double K = 0.0616;
private final double L = 1.0 / STRIPES;
private final double SIN36 = Math.sin(Math.PI/5);
private final double COS36 = Math.cos(Math.PI/5);
private final double SIN72 = Math.sin( 2 *(Math.PI/5) );
private final double COS72 = Math.cos( 2 * (Math.PI/5) );

public Flag(int width, int height) {
FLAG_WIDTH = width;
FLAG_HEIGHT = height;
init();
}

public void init() {
setSize(FLAG_WIDTH, FLAG_HEIGHT);
}

public void paintComponent(Graphics g) {

if ((float)this.getParent().getWidth() / this.getParent().getHeight() >= 1.9) {
FLAG_HEIGHT = this.getParent().getHeight();
FLAG_WIDTH = (int) (FLAG_HEIGHT * B);
} else {
FLAG_WIDTH = this.getParent().getWidth();
FLAG_HEIGHT = (int) (FLAG_WIDTH / B);
}
setSize(FLAG_WIDTH, FLAG_HEIGHT);

drawStripes(g);
drawField(g);

int starXPos = (int) (G * FLAG_HEIGHT);
int starYPos = (int) (E * FLAG_HEIGHT);

for (int i = 0; i < 9; i++) {
for (int j = 0; j < ((i % 2 == 0) ? 6 : 5); j++) {
drawStar(starXPos, starYPos, (int) (K * FLAG_HEIGHT / 2.0), (int) (K * FLAG_HEIGHT / 4.0), g);
starXPos += (int) (2 * H * FLAG_HEIGHT);
}

starXPos = ((i % 2 == 1) ? (int) (G * FLAG_HEIGHT) : (int) (G * FLAG_HEIGHT + H * FLAG_HEIGHT));

starYPos += (int) (F * FLAG_HEIGHT);
}
}

public void drawStripes(Graphics g) {
for (int i = 0; i < STRIPES; i++) {
if (i % 2 == 0) {
g.setColor(Color.RED);
} else {
g.setColor(Color.WHITE);
}
g.fillRect(0, (int)(i * L * FLAG_HEIGHT), (int)(B * FLAG_HEIGHT), (int)(L * FLAG_HEIGHT));
}
}
public void drawField(Graphics g) {
g.setColor(Color.BLUE);
g.fillRect(0 , 0 ,(int) (D * FLAG_HEIGHT), (int) (C * FLAG_HEIGHT));
}
public void drawStar(int xCenter, int yCenter, int outerRadius, int innerRadius, Graphics g) {

Graphics2D g2d = (Graphics2D) g;

AffineTransform rotateTransform = new AffineTransform();
rotateTransform.rotate(Math.toRadians(180.0), xCenter, yCenter);
g2d.setTransform(rotateTransform);

int xPoints[] = {xCenter, xCenter + (int) (innerRadius * SIN36) , xCenter + (int) ( (outerRadius) * SIN72) , xCenter + (int) ( (innerRadius) * SIN72) , xCenter + (int) ( (outerRadius) * SIN36) , xCenter , xCenter - (int) ( (outerRadius) * SIN36) , xCenter - (int) ( (innerRadius) * SIN72) , xCenter - (int) ( (outerRadius) * SIN72) , xCenter - (int) ( (innerRadius) * SIN36)};
int yPoints[] = {yCenter + outerRadius , yCenter + (int) (innerRadius * SIN36) , yCenter + (int) (outerRadius* COS72) , yCenter - (int) ( (innerRadius) * COS72) , yCenter - (int) ( (outerRadius) * COS36) , yCenter - innerRadius , yCenter - (int) ( (outerRadius) * COS36) , yCenter - (int) ( (innerRadius) * COS72) , yCenter + (int) ( (outerRadius) * COS72) , yCenter + (int) ( (innerRadius) * COS36)};
int points = 10;
g2d.setColor(Color.WHITE);
g2d.fillPolygon(xPoints, yPoints, points);
}

}