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Tyler Essinger
Moire Pattern 2 Java
0 Answer(s)      2 years and 10 months ago
Posted in : Java Beginners


textWhat you are seeing in the screenshot are two sets of concentric circles. The centers of the circles are 100 pixels apart. The circles have a width of 5, and the diameter of a circle is 20 pixels larger than its next smallest one. Diameters range from 20 to 480 pixels.

Hint: You can change the width of the 'pen' used for drawing to 5 pixels with the line g2.setStroke(new BasicStroke(5)).

Hint: A circle is just an oval whose width and height are the same.

Make the program from this older code:

import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JFrame; import javax.swing.JPanel;

public class Flower extends JPanel {

 public void paintComponent(Graphics g){ final int centerX = 300; final int centerY = 300; final int ovalWidth = 100; Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.black);g2.fillOval(centerX, centerY - ovalWidth / 2, 300, ovalWidth); g2.rotate(Math.toRadians(15),centerX,centerY);g2.fillOval(centerX, centerY - ovalWidth / 2, 300, ovalWidth);g2.rotate(Math.toRadians(15),centerX,centerY);g2.fillOval(centerX, centerY - ovalWidth / 2, 300, ovalWidth);g2.rotate(Math.toRadians(15),centerX,centerY);
 }

 public static void main(String[] args) { JFrame frame = new JFrame("Window"); //frame is the window frame.setDefaultCloseOperation(JFrame.EXITONCLOSE); Flower panel = new Flower(); //panel is the graphics area where we can draw
frame.add(panel); //put the panel inside the windowframe.setSize(640,640); //set the window size to 640x640 pixelsframe.setVisible(true);
 } }

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