/*
* 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/>
*/
package org.opensourcephysics.display3d.simple3d;
import java.awt.Color;
import java.awt.Graphics2D;
import org.opensourcephysics.controls.XML;
import org.opensourcephysics.controls.XMLControl;
import org.opensourcephysics.display3d.simple3d.utils.VectorAlgebra;
/**
* <p>Title: ElementSegment</p>
* <p>Description: A Segment using the painter's algorithm</p>
* @author Francisco Esquembre
* @version March 2005
*/
public class ElementSpring extends Element implements org.opensourcephysics.display3d.core.ElementSpring {
// Configuration variables
private double radius = 0.1;
// Implementation variables
private int loops = -1, pointsPerLoop = -1; // Make sure arrays are allocated
private int segments = 0;
private int aPoints[] = null, bPoints[] = null;
private double points[][] = null;
private double pixel[] = new double[3]; // The output for all projections
private Object3D[] objects = null; // The Objects3D of this Element
{ // Initialization block
getStyle().setResolution(new Resolution(8, 15, 1)); // the 1 is meaningless
}
// -------------------------------------
// New configuration methods
// -------------------------------------
public void setRadius(double radius) {
this.radius = radius;
setElementChanged(true);
}
public double getRadius() {
return this.radius;
}
// -------------------------------------
// Abstract part of Element or Parent methods overwritten
// -------------------------------------
Object3D[] getObjects3D() {
if(!isReallyVisible()) {
return null;
}
if(hasChanged()) {
computePoints();
projectPoints();
} else if(needsToProject()) {
projectPoints();
}
return objects;
}
void draw(Graphics2D _g2, int _index) {
// Allow the panel to adjust color according to depth
Color theColor = getDrawingPanel3D().projectColor(getRealStyle().getLineColor(), objects[_index].getDistance());
_g2.setColor(theColor);
_g2.setStroke(getRealStyle().getLineStroke());
_g2.drawLine(aPoints[_index], bPoints[_index], aPoints[_index+1], bPoints[_index+1]);
}
void drawQuickly(Graphics2D _g2) {
if(!isReallyVisible()) {
return;
}
if(hasChanged()) {
computePoints();
projectPoints();
} else if(needsToProject()) {
projectPoints();
}
_g2.setStroke(getRealStyle().getLineStroke());
_g2.setColor(getRealStyle().getLineColor());
_g2.drawPolyline(aPoints, bPoints, segments+1);
}
void getExtrema(double[] min, double[] max) {
min[0] = 0;
max[0] = 1;
min[1] = 0;
max[1] = 1;
min[2] = 0;
max[2] = 1;
sizeAndToSpaceFrame(min);
sizeAndToSpaceFrame(max);
}
// -------------------------------------
// Interaction
// -------------------------------------
protected InteractionTarget getTargetHit(int x, int y) {
if(!isReallyVisible()) {
return null;
}
if(hasChanged()) {
computePoints();
projectPoints();
} else if(needsToProject()) {
projectPoints();
}
if(targetPosition.isEnabled()&&(Math.abs(aPoints[0]-x)<SENSIBILITY)&&(Math.abs(bPoints[0]-y)<SENSIBILITY)) {
return targetPosition;
}
if(targetSize.isEnabled()&&(Math.abs(aPoints[segments]-x)<SENSIBILITY)&&(Math.abs(bPoints[segments]-y)<SENSIBILITY)) {
return targetSize;
}
return null;
}
// -------------------------------------
// Private methods
// -------------------------------------
void projectPoints() {
for(int i = 0; i<segments; i++) {
getDrawingPanel3D().project(points[i], pixel);
aPoints[i] = (int) pixel[0];
bPoints[i] = (int) pixel[1];
objects[i].setDistance(pixel[2]*getStyle().getDepthFactor()); // distance is given by the first point
}
getDrawingPanel3D().project(points[segments], pixel);
aPoints[segments] = (int) pixel[0];
bPoints[segments] = (int) pixel[1];
setNeedToProject(false);
}
private void computePoints() {
int theLoops = loops, thePPL = pointsPerLoop;
org.opensourcephysics.display3d.core.Resolution res = getRealStyle().getResolution();
if(res!=null) {
switch(res.getType()) {
case org.opensourcephysics.display3d.core.Resolution.DIVISIONS :
theLoops = Math.max(res.getN1(), 0);
thePPL = Math.max(res.getN2(), 1);
break;
}
}
if((theLoops==loops)&&(thePPL==pointsPerLoop)) {
// empty // No need to reallocate arrays
} else { // Reallocate arrays
loops = theLoops;
pointsPerLoop = thePPL;
segments = loops*pointsPerLoop+3;
points = new double[segments+1][3];
aPoints = new int[segments+1];
bPoints = new int[segments+1];
objects = new Object3D[segments];
for(int i = 0; i<segments; i++) {
objects[i] = new Object3D(this, i);
}
}
double[] size = new double[] {getSizeX(), getSizeY(), getSizeZ()};
double[] u1 = VectorAlgebra.normalTo(size);
double[] u2 = VectorAlgebra.normalize(VectorAlgebra.crossProduct(size, u1));
double delta = 2.0*Math.PI/pointsPerLoop;
int pre = pointsPerLoop/2;
for(int i = 0; i<=segments; i++) {
int k;
if(i<pre) {
k = 0;
} else if(i<pointsPerLoop) {
k = i-pre;
} else if(i>(segments-pre)) {
k = 0;
} else if(i>(segments-pointsPerLoop)) {
k = segments-i-pre;
} else {
k = pre;
}
double angle = i*delta;
double cos = Math.cos(angle), sin = Math.sin(angle);
points[i][0] = i*getSizeX()/segments+k*radius*(cos*u1[0]+sin*u2[0])/pre;
points[i][1] = i*getSizeY()/segments+k*radius*(cos*u1[1]+sin*u2[1])/pre;
points[i][2] = i*getSizeZ()/segments+k*radius*(cos*u1[2]+sin*u2[2])/pre;
toSpaceFrame(points[i]); // apply the transformation(s)
}
setElementChanged(false);
}
// ----------------------------------------------------
// XML loader
// ----------------------------------------------------
/**
* Returns an XML.ObjectLoader to save and load object data.
* @return the XML.ObjectLoader
*/
public static XML.ObjectLoader getLoader() {
return new Loader();
}
static private class Loader extends org.opensourcephysics.display3d.core.ElementSpring.Loader {
public Object createObject(XMLControl control) {
return new ElementSpring();
}
}
}
/*
* 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
*/