Translate coordinate to the center of paint area - Java 2D Graphics

Java examples for 2D Graphics:Transform

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Description

Translate coordinate to the center of paint area

Demo Code

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Main extends JFrame {

  public static void main(String[] args) { // TODO Auto-generated method stub
    Main opdr = new Main();
  }/* ww w .  j  a  v  a  2s  .  c  o m*/

  public Main() {
    super("line");
    setSize(600, 600);
    setTitle("2D Line");
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    JPanel panel = new JPanel(new BorderLayout());
    JPanel topPanel = new JPanel(new FlowLayout());
    panel.add(topPanel, BorderLayout.NORTH);

    JLabel statusLabel = new JLabel("Draw a Line");
    topPanel.add(statusLabel);

    JPanel centerPanel = new Opdracht2_2a();
    panel.add(centerPanel, BorderLayout.CENTER);

    JPanel bottomPanel = new JPanel(new FlowLayout());
    panel.add(bottomPanel, BorderLayout.SOUTH);

    setContentPane(panel);
    setVisible(true);
  }

  public class Opdracht2_2a extends JPanel {
    public Opdracht2_2a() {
      setPreferredSize(new Dimension(600, 400));
    }

    public void paintComponent(Graphics g) {
      Graphics2D g2 = (Graphics2D) g;
      int t = 7;
      g2.translate(getWidth() / 2, getHeight() / 2);

      if (t <= 8 && t >= 0) {
        int x = (int) ((20 * t) * (Math.cos(t)));
        int y = (int) ((20 * t) * (Math.sin(t)));

        g2.drawLine(0, 0, x, y);
      } else
        System.out.println("kan niet");
    }
  }

}

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