/*
* 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.Graphics;
import org.opensourcephysics.display.Circle;
import org.opensourcephysics.display.DrawingPanel;
/**
* This is a circle that implements the Trackable interface and
* is associated with a single video frame. The draw method
* illustrates the process of transforming imagespace to
* worldspace coordinates.
*
* @author Douglas Brown
* @version 1.0
*/
public class TrackableCircle extends Circle implements Trackable {
// instance fields
protected int n;
/**
* Constructs a TrackableCircle.
*
* @param n the video frame number
* @param imageX the x position in imagespace
* @param imageY the y position in imagespace
*/
public TrackableCircle(int n, double imageX, double imageY) {
super(imageX, imageY);
this.n = n;
color = Color.green;
}
/**
* Gets the frame number.
*
* @return the frame number
*/
public int getFrameNumber() {
return n;
}
/**
* Overrides the Circle draw method.
*
* @param panel the drawing panel requesting the drawing
* @param g the graphics context on which to draw
*/
public void draw(DrawingPanel panel, Graphics g) {
if(!(panel instanceof VideoPanel)) {
return;
}
VideoPanel vidPanel = (VideoPanel) panel; // only draws on video panels
double x = getX(); // image position
double y = getY(); // image position
if(!vidPanel.isDrawingInImageSpace()) { // convert to worldspace
x = vidPanel.getCoords().imageToWorldX(n, getX(), getY());
y = vidPanel.getCoords().imageToWorldY(n, getX(), getY());
}
// standard drawing panel drawing from here on
int xpix = panel.xToPix(x)-pixRadius;
int ypix = panel.yToPix(y)-pixRadius;
g.setColor(color);
g.fillOval(xpix, ypix, 2*pixRadius, 2*pixRadius);
}
}
/*
* 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
*/