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PORotating a shape vertically around the x-axis
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copied!<p>I have a 2d graph with an x and y axis and im trying to rotate a shape (series of points) around an axis. This rotation will need to include a scale function.</p> <pre><code>import java.awt.*; import java.awt.event.*; import java.awt.geom.AffineTransform; import java.awt.geom.Point2D; import javax.swing.*; import java.lang.reflect.Array; public class test extends JPanel implements ActionListener { int[] p1x = {200, 200, 240, 240, 220, 220, 200}; int[] p1y = {200, 260, 260, 240, 240, 200, 200}; int[] p2x = {600, 600, 620, 620, 640, 640, 660, 660, 600}; int[] p2y = {400, 420, 420, 460, 460, 420, 420, 400, 400}; int[] p3x = {400, 400, 460, 460, 440, 440, 420, 420, 400}; int[] p3y = {400, 460, 460, 400, 400, 440, 440, 400, 400}; int delay = 1000; int dx = 0; int dy = 5; int steps = 121; Polygon t; Timer tim = new Timer(delay, this); public void actionPerformed(ActionEvent event) { for (int i = 0; i < Array.getLength(p2x); i++) { //p2x[i] = (int) (p2x[i]*Math.cos(Math.toRadians(1))- p2y[i]*Math.sin(Math.toRadians(1))); //p2y[i] = (int) (p2x[i]*Math.sin(Math.toRadians(1))+ p2y[i]*Math.cos(Math.toRadians(1)));; Point2D original = new Point2D.Double(p2x[i], p2y[i]); AffineTransform at = new AffineTransform(); //at.setToRotation(.02, 250, 250); at.scale(1, -1); Point2D rotated = at.transform(original, null); p2x[i] = (int) rotated.getX(); p2y[i] = (int) rotated.getY(); } repaint(); if (--steps == 0) { tim.stop(); } } public void paintComponent(Graphics g) { super.paintComponent(g); this.setBackground(Color.white); g.drawLine(this.getWidth() / 2, 0, this.getWidth() / 2, this.getWidth()); g.drawLine(0, this.getHeight() / 2, this.getHeight(), this.getHeight() / 2); Polygon t = new Polygon(p2x, p2y, 9); g.drawPolygon(t); Letters u = new Letters(p3x, p3y, 9); u.draw(g); Letters l = new Letters(p1x, p1y, 7); l.draw(g); } public static void main(String[] args) { JFrame frame = new JFrame("Drawing line and a moving polygon"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); test sl = new test(); frame.getContentPane().add(sl); frame.setSize(700, 700); frame.setVisible(true); sl.tim.start(); } } </code></pre>

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