围绕x轴垂直旋转形状

我有一个带有x和y轴的2d图形，我试图围绕轴旋转一个形状（一系列点）。 此旋转需要包括缩放function。

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(); } } 

Answer 1

如果没有明确的问题，使用坐标数组的简单动画如下所示。 通常，您可以转换图形上下文（ g2d ）或多边形Shape本身（ p3 ）; 这个例子显示了两者。 调整窗口大小以查看每个窗口的效果。

请注意at转换的最后指定的第一个应用顺序。 首先，将p3上的合适点转换为原点，然后缩放p3 ，然后将p3转换为面板的中心。 应用于p3的+ 10软糖因子是没有对称旋转点的人工p3 。 相对于原点定义多边形可能更容易，如本例所示。

 import java.awt.*; import java.awt.event.*; import java.awt.geom.AffineTransform; import javax.swing.*; /** @see http://stackoverflow.com/questions/3405799 */ public class AffineTest extends JPanel implements ActionListener { private static final double DELTA_THETA = Math.PI / 45; // 4° private static final double DELTA_SCALE = 0.1; private int[] p1x = {200, 200, 240, 240, 220, 220, 200}; private int[] p1y = {200, 260, 260, 240, 240, 200, 200}; private int[] p2x = {600, 600, 620, 620, 640, 640, 660, 660, 600}; private int[] p2y = {400, 420, 420, 460, 460, 420, 420, 400, 400}; private int[] p3x = {400, 400, 460, 460, 440, 440, 420, 420, 400}; private int[] p3y = {400, 460, 460, 400, 400, 440, 440, 400, 400}; private Polygon p1 = new Polygon(p1x, p1y, p1x.length); private Polygon p2 = new Polygon(p2x, p2y, p2x.length); private Polygon p3 = new Polygon(p3x, p3y, p3x.length); private AffineTransform at = new AffineTransform(); private double dt = DELTA_THETA; private double theta; private double ds = DELTA_SCALE; private double scale = 1; private Timer timer = new Timer(100, this); public AffineTest() { this.setPreferredSize(new Dimension(700, 700)); this.setBackground(Color.white); p1.translate(-50, +100); p2.translate(-100, -100); } @Override public void actionPerformed(ActionEvent event) { theta += dt; scale += ds; if (scale < .5 || scale > 4) { ds = -ds; } repaint(); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; g2d.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); int w = this.getWidth(); int h = this.getHeight(); g2d.drawLine(w / 2, 0, w / 2, h); g2d.drawLine(0, h / 2, w, h / 2); g2d.rotate(theta, w / 2, h / 2); g2d.drawPolygon(p1); g2d.drawPolygon(p2); at.setToIdentity(); at.translate(w / 2, h / 2); at.scale(scale, scale); at.translate(-p3x[5] + 10, -p3y[5]); g2d.setPaint(Color.blue); g2d.fill(at.createTransformedShape(p3)); } public void start() { timer.start(); } public static void main(String[] args) { JFrame frame = new JFrame("Affine Test"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); AffineTest sl = new AffineTest(); frame.add(sl); frame.pack(); frame.setVisible(true); sl.start(); } }