Michael Bayne
8e7997a061
git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@305 ed5b42cb-e716-0410-a449-f6a68f950b19
102 lines
3.0 KiB
Java
102 lines
3.0 KiB
Java
//
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// $Id: NearestViz.java 3099 2004-08-27 02:21:06Z mdb $
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//
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// Narya library - tools for developing networked games
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// Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
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// http://www.threerings.net/code/narya/
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.threerings.geom;
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import java.awt.BorderLayout;
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import java.awt.Color;
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import java.awt.Graphics;
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import java.awt.Point;
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import java.awt.event.MouseEvent;
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import java.awt.event.MouseMotionListener;
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import javax.swing.JFrame;
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import javax.swing.JPanel;
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import com.samskivert.swing.util.SwingUtil;
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/**
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* Renders the nearest point on a line just for kicks.
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*/
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public class NearestViz extends JPanel
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implements MouseMotionListener
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{
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public NearestViz ()
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{
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addMouseMotionListener(this);
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}
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public void doLayout ()
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{
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super.doLayout();
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_center = new Point(getWidth() / 2, getHeight() / 2);
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}
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public void paintComponent (Graphics g)
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{
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super.paintComponent(g);
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int dx = (int)Math.round(Math.cos(_theta) * 200);
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int dy = (int)Math.round(Math.sin(_theta) * 200);
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g.setColor(Color.blue);
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g.drawLine(_center.x, _center.y, _center.x + dx, _center.y - dy);
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g.drawLine(_center.x, _center.y, _center.x - dx, _center.y + dy);
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// locate the point nearest the spot
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Point p2 = new Point(_center.x + dx, _center.y - dy);
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Point n = new Point();
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GeomUtil.nearestToLine(_center, p2, _spot, n);
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g.setColor(Color.red);
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g.drawOval(n.x - 4, n.y - 4, 8, 8);
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// kick theta along for the next tick because it's fun
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_theta += (float)(Math.PI/100);
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}
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public void mouseDragged (MouseEvent event)
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{
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}
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public void mouseMoved (MouseEvent event)
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{
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_spot.x = event.getX();
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_spot.y = event.getY();
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repaint();
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}
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public static void main (String[] args)
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{
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JFrame frame = new JFrame();
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.getContentPane().add(new NearestViz(), BorderLayout.CENTER);
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frame.setSize(300, 300);
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SwingUtil.centerWindow(frame);
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frame.setVisible(true);
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}
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protected float _theta = (float)(3 * Math.PI / 5);
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protected Point _center;
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protected Point _spot = new Point();
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}
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