Circular motion applet

[richard dela cruz]

can anyone tell me an easy way to make a single dot move in circular motion? so far... i've only done these...

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JApplet;
import javax.swing.JFrame;

public class JavaApplication1 extends JApplet {

	public void paint(Graphics g) {
		try {
			g.setColor(Color.WHITE);
			g.fillRect(0, 0, 500, 500);
			g.setColor(Color.BLACK);
			g.drawRect(250, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(251, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(252, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(253, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(254, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(255, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(256, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(257, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(258, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(259, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(260, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(261, 100, 1, 1);
			Thread.sleep(10);
			g.drawRect(262, 101, 1, 1);
			Thread.sleep(10);
			g.drawRect(263, 101, 1, 1);
			Thread.sleep(10);
			g.drawRect(264, 101, 1, 1);
			Thread.sleep(10);
			g.drawRect(265, 101, 1, 1);
			Thread.sleep(10);
			g.drawRect(266, 101, 1, 1);
			Thread.sleep(10);
			g.drawRect(267, 101, 1, 1);
			Thread.sleep(10);
			g.drawRect(268, 102, 1, 1);
			Thread.sleep(10);
			g.drawRect(269, 102, 1, 1);
			Thread.sleep(10);
			g.drawRect(270, 102, 1, 1);
			Thread.sleep(10);
			g.drawRect(271, 102, 1, 1);
			Thread.sleep(10);
			g.drawRect(272, 102, 1, 1);
			Thread.sleep(10);
			g.drawRect(273, 103, 1, 1);
			Thread.sleep(10);
			g.drawRect(274, 103, 1, 1);
			Thread.sleep(10);
			g.drawRect(275, 103, 1, 1);
			Thread.sleep(10);
			g.drawRect(276, 104, 1, 1);
			Thread.sleep(10);
			g.drawRect(277, 104, 1, 1);
			Thread.sleep(10);
			g.drawRect(278, 104, 1, 1);
			Thread.sleep(10);
			g.drawRect(279, 104, 1, 1);
			Thread.sleep(10);
			g.drawRect(280, 105, 1, 1);
			Thread.sleep(10);
			g.drawRect(281, 105, 1, 1);
			Thread.sleep(10);
			g.drawRect(282, 105, 1, 1);
			Thread.sleep(10);
			g.drawRect(283, 106, 1, 1);
			Thread.sleep(10);
			g.drawRect(284, 106, 1, 1);
			Thread.sleep(10);
			g.drawRect(285, 106, 1, 1);
			Thread.sleep(10);
			g.drawRect(286, 107, 1, 1);
			Thread.sleep(10);
			g.drawRect(287, 107, 1, 1);
			Thread.sleep(10);
			g.drawRect(288, 107, 1, 1);
			Thread.sleep(10);
			g.drawRect(289, 108, 1, 1);
			Thread.sleep(10);
			g.drawRect(290, 108, 1, 1);
			Thread.sleep(10);
			g.drawRect(291, 108, 1, 1);
			Thread.sleep(10);
			g.drawRect(292, 109, 1, 1);
			Thread.sleep(10);
			g.drawRect(293, 110, 1, 1);
			Thread.sleep(10);
			g.drawRect(294, 110, 1, 1);
			Thread.sleep(10);
			g.drawRect(295, 111, 1, 1);
			Thread.sleep(10);
			g.drawRect(296, 111, 1, 1);
			Thread.sleep(10);
			g.drawRect(297, 112, 1, 1);
			Thread.sleep(10);
			g.drawRect(298, 112, 1, 1);
			Thread.sleep(10);
			g.drawRect(299, 113, 1, 1);
			Thread.sleep(10);
			g.drawRect(300, 113, 1, 1);
			Thread.sleep(10);
			g.drawRect(301, 114, 1, 1);
			Thread.sleep(10);
			g.drawRect(302, 114, 1, 1);
			Thread.sleep(10);
			g.drawRect(303, 115, 1, 1);
			Thread.sleep(10);
			g.drawRect(304, 115, 1, 1);
			Thread.sleep(10);
			g.drawRect(305, 116, 1, 1);
			Thread.sleep(10);
			g.drawRect(306, 117, 1, 1);
			Thread.sleep(10);
			g.drawRect(307, 117, 1, 1);
			Thread.sleep(10);
			g.drawRect(308, 118, 1, 1);
			Thread.sleep(10);
			g.drawRect(309, 119, 1, 1);
			Thread.sleep(10);
			g.drawRect(310, 120, 1, 1);
			Thread.sleep(10);
			g.drawRect(311, 120, 1, 1);
			Thread.sleep(10);
			g.drawRect(312, 121, 1, 1);
			Thread.sleep(10);
			g.drawRect(313, 122, 1, 1);
			Thread.sleep(10);
			g.drawRect(314, 123, 1, 1);
			Thread.sleep(10);
			g.drawRect(315, 124, 1, 1);
			Thread.sleep(10);
			g.drawRect(316, 125, 1, 1);
			Thread.sleep(10);
			g.drawRect(317, 125, 1, 1);
			Thread.sleep(10);
			g.drawRect(318, 126, 1, 1);
			Thread.sleep(10);
			g.drawRect(319, 127, 1, 1);
			Thread.sleep(10);
			g.drawRect(320, 128, 1, 1);
			Thread.sleep(10);
			g.drawRect(321, 129, 1, 1);
			Thread.sleep(10);
			g.drawRect(322, 130, 1, 1);
			Thread.sleep(10);
			g.drawRect(323, 131, 1, 1);
			Thread.sleep(10);
			g.drawRect(324, 132, 1, 1);
			Thread.sleep(10);
			g.drawRect(325, 133, 1, 1);
			Thread.sleep(10);
			g.drawRect(326, 134, 1, 1);
			Thread.sleep(10);
			g.drawRect(327, 135, 1, 1);
			Thread.sleep(10);
			g.drawRect(327, 136, 1, 1);
			Thread.sleep(10);
			g.drawRect(328, 137, 1, 1);
			Thread.sleep(10);
			g.drawRect(329, 138, 1, 1);
			Thread.sleep(10);
			g.drawRect(330, 139, 1, 1);
			Thread.sleep(10);
			g.drawRect(331, 140, 1, 1);
			Thread.sleep(10);
			g.drawRect(332, 141, 1, 1);
			Thread.sleep(10);
			g.drawRect(332, 142, 1, 1);
			Thread.sleep(10);
			g.drawRect(333, 143, 1, 1);
			Thread.sleep(10);
			g.drawRect(334, 144, 1, 1);
			Thread.sleep(10);
			g.drawRect(335, 145, 1, 1);
			Thread.sleep(10);
			g.drawRect(335, 146, 1, 1);
			Thread.sleep(10);
			g.drawRect(336, 147, 1, 1);
			Thread.sleep(10);
			g.drawRect(336, 148, 1, 1);
			Thread.sleep(10);
			g.drawRect(337, 149, 1, 1);
			Thread.sleep(10);
			g.drawRect(338, 150, 1, 1);
			Thread.sleep(10);
			g.drawRect(338, 151, 1, 1);
			Thread.sleep(10);
			g.drawRect(339, 152, 1, 1);
			Thread.sleep(10);
			g.drawRect(339, 153, 1, 1);
			Thread.sleep(10);
			g.drawRect(340, 154, 1, 1);
			Thread.sleep(10);
			g.drawRect(340, 155, 1, 1);
			Thread.sleep(10);
			g.drawRect(341, 156, 1, 1);
			Thread.sleep(10);
			g.drawRect(341, 157, 1, 1);
			Thread.sleep(10);
			g.drawRect(342, 158, 1, 1);
			Thread.sleep(10);
			g.drawRect(342, 159, 1, 1);
			Thread.sleep(10);
			g.drawRect(343, 160, 1, 1);
			Thread.sleep(10);
			g.drawRect(344, 161, 1, 1);
			Thread.sleep(10);
			g.drawRect(344, 162, 1, 1);
			Thread.sleep(10);
			g.drawRect(344, 163, 1, 1);
			Thread.sleep(10);
			g.drawRect(345, 164, 1, 1);
			Thread.sleep(10);
			g.drawRect(345, 165, 1, 1);
			Thread.sleep(10);
			g.drawRect(345, 166, 1, 1);
			Thread.sleep(10);
			g.drawRect(346, 167, 1, 1);
			Thread.sleep(10);
			g.drawRect(346, 168, 1, 1);
			Thread.sleep(10);
			g.drawRect(346, 169, 1, 1);
			Thread.sleep(10);
			g.drawRect(347, 170, 1, 1);
			Thread.sleep(10);
			g.drawRect(347, 171, 1, 1);
			Thread.sleep(10);
			g.drawRect(347, 172, 1, 1);
			Thread.sleep(10);
			g.drawRect(347, 173, 1, 1);
			Thread.sleep(10);
			g.drawRect(348, 174, 1, 1);
			Thread.sleep(10);
			g.drawRect(348, 175, 1, 1);
			Thread.sleep(10);
			g.drawRect(348, 176, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 177, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 178, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 179, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 180, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 181, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 182, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 183, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 184, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 185, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 186, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 187, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 188, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 189, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 190, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 191, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 192, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 193, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 194, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 195, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 196, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 197, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 198, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 199, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 200, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 201, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 202, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 203, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 204, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 205, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 206, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 207, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 208, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 209, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 210, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 211, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 212, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 213, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 214, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 215, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 216, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 217, 1, 1);
			Thread.sleep(10);
			g.drawRect(350, 218, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 219, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 220, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 221, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 222, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 223, 1, 1);
			Thread.sleep(10);
			g.drawRect(349, 224, 1, 1);
			Thread.sleep(10);
			g.drawRect(348, 225, 1, 1);
			Thread.sleep(10);
			g.drawRect(348, 226, 1, 1);
			Thread.sleep(10);
			g.drawRect(348, 227, 1, 1);
			Thread.sleep(10);
			g.drawRect(347, 228, 1, 1);
			Thread.sleep(10);
			g.drawRect(347, 229, 1, 1);
			Thread.sleep(10);
			g.drawRect(347, 230, 1, 1);
			Thread.sleep(10);
			g.drawRect(347, 231, 1, 1);
			Thread.sleep(10);
			g.drawRect(346, 232, 1, 1);
			Thread.sleep(10);
			g.drawRect(346, 233, 1, 1);
			Thread.sleep(10);
			g.drawRect(346, 234, 1, 1);
			Thread.sleep(10);
			g.drawRect(345, 235, 1, 1);
			Thread.sleep(10);
			g.drawRect(345, 236, 1, 1);
			Thread.sleep(10);
			g.drawRect(345, 237, 1, 1);
			Thread.sleep(10);
			g.drawRect(344, 238, 1, 1);
			Thread.sleep(10);
			g.drawRect(344, 239, 1, 1);
			Thread.sleep(10);
			g.drawRect(344, 240, 1, 1);
			Thread.sleep(10);
			g.drawRect(343, 241, 1, 1);
			Thread.sleep(10);
			g.drawRect(342, 242, 1, 1);
			Thread.sleep(10);
			g.drawRect(342, 243, 1, 1);
			Thread.sleep(10);
			g.drawRect(341, 244, 1, 1);
			Thread.sleep(10);
			g.drawRect(341, 245, 1, 1);
			Thread.sleep(10);
			g.drawRect(340, 246, 1, 1);
			Thread.sleep(10);
			g.drawRect(340, 247, 1, 1);
			Thread.sleep(10);
			g.drawRect(339, 248, 1, 1);
			Thread.sleep(10);
			g.drawRect(339, 249, 1, 1);
			Thread.sleep(10);
			g.drawRect(338, 250, 1, 1);
			Thread.sleep(10);
			g.drawRect(338, 251, 1, 1);
			Thread.sleep(10);
			g.drawRect(337, 252, 1, 1);
			Thread.sleep(10);
			g.drawRect(336, 253, 1, 1);
			Thread.sleep(10);
			g.drawRect(336, 254, 1, 1);
			Thread.sleep(10);
			g.drawRect(335, 255, 1, 1);
			Thread.sleep(10);
			g.drawRect(335, 256, 1, 1);
			Thread.sleep(10);
			g.drawRect(334, 257, 1, 1);
			Thread.sleep(10);
			g.drawRect(333, 258, 1, 1);
			Thread.sleep(10);
			g.drawRect(332, 259, 1, 1);
			Thread.sleep(10);
			g.drawRect(332, 260, 1, 1);
			Thread.sleep(10);
			g.drawRect(331, 261, 1, 1);
			Thread.sleep(10);
			g.drawRect(330, 262, 1, 1);
			Thread.sleep(10);
			g.drawRect(329, 263, 1, 1);
			Thread.sleep(10);
			g.drawRect(328, 264, 1, 1);
			Thread.sleep(10);
			g.drawRect(327, 265, 1, 1);
			Thread.sleep(10);
			g.drawRect(327, 266, 1, 1);
			Thread.sleep(10);
			g.drawRect(326, 267, 1, 1);
			Thread.sleep(10);
			g.drawRect(325, 268, 1, 1);
			Thread.sleep(10);
			g.drawRect(324, 269, 1, 1);
			Thread.sleep(10);
			g.drawRect(323, 270, 1, 1);
			Thread.sleep(10);
			g.drawRect(322, 271, 1, 1);
			Thread.sleep(10);
			g.drawRect(321, 272, 1, 1);
			Thread.sleep(10);
			g.drawRect(320, 273, 1, 1);
			Thread.sleep(10);
			g.drawRect(319, 274, 1, 1);
			Thread.sleep(10);
			g.drawRect(318, 275, 1, 1);
			Thread.sleep(10);
			g.drawRect(317, 276, 1, 1);
			Thread.sleep(10);
			g.drawRect(316, 276, 1, 1);
			Thread.sleep(10);
			g.drawRect(315, 277, 1, 1);
			Thread.sleep(10);
			g.drawRect(314, 278, 1, 1);
			Thread.sleep(10);
			g.drawRect(313, 279, 1, 1);
			Thread.sleep(10);
			g.drawRect(312, 280, 1, 1);
			Thread.sleep(10);
			g.drawRect(311, 281, 1, 1);
			Thread.sleep(10);
			g.drawRect(310, 281, 1, 1);
			Thread.sleep(10);
			g.drawRect(309, 282, 1, 1);
			Thread.sleep(10);
			g.drawRect(308, 283, 1, 1);
			Thread.sleep(10);
			g.drawRect(307, 284, 1, 1);
			Thread.sleep(10);
			g.drawRect(306, 284, 1, 1);
			Thread.sleep(10);
			g.drawRect(305, 285, 1, 1);
			Thread.sleep(10);
			g.drawRect(304, 286, 1, 1);
			Thread.sleep(10);
			g.drawRect(303, 286, 1, 1);
			Thread.sleep(10);
			g.drawRect(302, 287, 1, 1);
			Thread.sleep(10);
			g.drawRect(301, 287, 1, 1);
			Thread.sleep(10);
			g.drawRect(300, 288, 1, 1);
			Thread.sleep(10);
			g.drawRect(299, 288, 1, 1);
			Thread.sleep(10);
			g.drawRect(298, 289, 1, 1);
			Thread.sleep(10);
			g.drawRect(297, 289, 1, 1);
			Thread.sleep(10);
			g.drawRect(296, 290, 1, 1);
			Thread.sleep(10);
			g.drawRect(295, 290, 1, 1);
			Thread.sleep(10);
			g.drawRect(294, 291, 1, 1);
			Thread.sleep(10);
			g.drawRect(293, 291, 1, 1);
			Thread.sleep(10);
			g.drawRect(292, 292, 1, 1);
			Thread.sleep(10);
			g.drawRect(291, 293, 1, 1);
			Thread.sleep(10);
			g.drawRect(290, 293, 1, 1);
			Thread.sleep(10);
			g.drawRect(289, 293, 1, 1);
			Thread.sleep(10);
			g.drawRect(288, 294, 1, 1);
			Thread.sleep(10);
			g.drawRect(287, 294, 1, 1);
			Thread.sleep(10);
			g.drawRect(286, 294, 1, 1);
			Thread.sleep(10);
			g.drawRect(285, 295, 1, 1);
			Thread.sleep(10);
			g.drawRect(284, 295, 1, 1);
			Thread.sleep(10);
			g.drawRect(283, 295, 1, 1);
			Thread.sleep(10);
			g.drawRect(282, 296, 1, 1);
			Thread.sleep(10);
			g.drawRect(281, 296, 1, 1);
			Thread.sleep(10);
			g.drawRect(280, 296, 1, 1);
			Thread.sleep(10);
			g.drawRect(279, 297, 1, 1);
			Thread.sleep(10);
			g.drawRect(278, 297, 1, 1);
			Thread.sleep(10);
			g.drawRect(277, 297, 1, 1);
			Thread.sleep(10);
			g.drawRect(276, 297, 1, 1);
			Thread.sleep(10);
			g.drawRect(275, 298, 1, 1);
			Thread.sleep(10);
			g.drawRect(274, 298, 1, 1);
			Thread.sleep(10);
			g.drawRect(273, 298, 1, 1);
			Thread.sleep(10);
			g.drawRect(272, 298, 1, 1);
			Thread.sleep(10);
			g.drawRect(271, 299, 1, 1);
			Thread.sleep(10);
			g.drawRect(270, 299, 1, 1);
			Thread.sleep(10);
			g.drawRect(269, 299, 1, 1);
			Thread.sleep(10);
			g.drawRect(268, 299, 1, 1);
			Thread.sleep(10);
			g.drawRect(267, 299, 1, 1);
			Thread.sleep(10);
			g.drawRect(266, 299, 1, 1);
			Thread.sleep(10);
			g.drawRect(265, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(264, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(263, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(262, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(261, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(260, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(259, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(258, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(257, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(256, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(255, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(254, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(253, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(252, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(251, 300, 1, 1);
			Thread.sleep(10);
			g.drawRect(250, 300, 1, 1);
			Thread.sleep(10);
		} catch (InterruptedException e) {

		}
	}

	public static void main(String[] args) {
		JFrame win = new JFrame();
		win.setBounds(30, 30, 500, 500);
		win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		win.getContentPane().add(new JavaApplication1());
		win.setVisible(true);
	}
}

[Jelle Klap]

Think about how you would normally find the X and Y coördinates of a point on the unit circle.
Then think about how you could use that same logic to implement a dot that moves in a circular motion.

[Darryl Burke]

Don't use Thread#sleep(...) in a painting method override or indeed in any code that runs on the EDT.

Use a javax.swing.Timer for animation. Change the coordinates and call repaint().