/*
* Open Source Physics software is free software as described near the bottom of this code file.
*
* For additional information and documentation on Open Source Physics please see:
* <http://www.opensourcephysics.org/>
*/
/*
* The org.opensourcephysics.media.core package defines the Open Source Physics
* media framework for working with video and other media.
*
* Copyright (c) 2014 Douglas Brown and Wolfgang Christian.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA
* or view the license online at http://www.gnu.org/copyleft/gpl.html
*
* For additional information and documentation on Open Source Physics,
* please see <http://www.opensourcephysics.org/>.
*/
package org.opensourcephysics.media.core;
import java.awt.Color;
import java.awt.Point;
import java.awt.Shape;
import java.awt.geom.Ellipse2D;
import org.opensourcephysics.display.DrawingPanel;
import org.opensourcephysics.display.Interactive;
/**
* This is a Trackable circle that extends TShape.
*
* @author Douglas Brown
* @version 1.0
*/
public class TCircle extends TShape {
// instance fields
protected Ellipse2D circle = new Ellipse2D.Double();
protected int radius = 5;
protected int n;
/**
* Constructs a TCircle with image coordinates (0, 0).
*
* @param n the video frame number
*/
public TCircle(int n) {
this(n, 0, 0);
}
/**
* Constructs a TCircle with specified image coordinates.
*
* @param n the video frame number
* @param x the x coordinate
* @param y the y coordinate
*/
public TCircle(int n, double x, double y) {
super(x, y);
this.n = n;
setColor(Color.red);
}
/**
* Sets the radius of this circle.
*
* @param radius the radius in screen pixels
*/
public void setRadius(int radius) {
this.radius = radius;
}
/**
* Gets the radius of this circle.
*
* @return the radius in screen pixels
*/
public int getRadius() {
return radius;
}
/**
* Overrides TPoint getFrameNumber method.
*
* @param vidPanel the video panel drawing this circle
* @return the frame number
*/
public int getFrameNumber(VideoPanel vidPanel) {
return n;
}
/**
* Returns this if it is enabled and visible and the specified
* pixel position falls within the bounds of this circle.
*
* @param panel the drawing panel
* @param xpix the x pixel position on the panel
* @param ypix the y pixel position on the panel
* @return this if enabled and hit, otherwise null
*/
public Interactive findInteractive(DrawingPanel panel, int xpix, int ypix) {
if(!(panel instanceof VideoPanel)) {
return null;
}
VideoPanel vidPanel = (VideoPanel) panel;
if(!isEnabled()||!isVisible()) {
return null;
}
if(getBounds(vidPanel).contains(xpix, ypix)) {
return this;
}
return null;
}
//________________________ protected methods ________________________
/**
* Gets the circle shape to be filled in the draw method.
*
* @param vidPanel the video panel
* @return the circle shape
*/
protected Shape getShape(VideoPanel vidPanel) {
Point p = getScreenPosition(vidPanel);
double xpix = p.x-radius;
double ypix = p.y-radius;
if(stroke==null) {
circle.setFrame(xpix, ypix, 2*radius, 2*radius);
return circle;
}
double w = stroke.getLineWidth();
circle.setFrame(xpix+w/2, ypix+w/2, 2*radius-w, 2*radius-w);
return stroke.createStrokedShape(circle);
}
}
/*
* Open Source Physics software is free software; you can redistribute
* it and/or modify it under the terms of the GNU General Public License (GPL) as
* published by the Free Software Foundation; either version 2 of the License,
* or(at your option) any later version.
* Code that uses any portion of the code in the org.opensourcephysics package
* or any subpackage (subdirectory) of this package must must also be be released
* under the GNU GPL license.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA
* or view the license online at http://www.gnu.org/copyleft/gpl.html
*
* Copyright (c) 2007 The Open Source Physics project
* http://www.opensourcephysics.org
*/