/*
* 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;
/**
* <p>Title: ElementSegment</p>
* <p>Description: A Segment using the painter's algorithm</p>
* @author Francisco Esquembre
* @version March 2005
*/
public class ElementSegment extends Element implements org.opensourcephysics.display3d.core.ElementSegment {
/* Implementation variables */
protected int div = -1; // divisions of the segment. -1 to make sure new arrays are allocated
protected int aCoord[] = null, bCoord[] = null; // The integer coordinates of the projected points
protected Object3D[] objects = null; // The Objects3D for this Drawable3D
private double points[][] = null; // coordinates for the 3D points of the segment and its subdivisions
private double[] coordinates = new double[3]; // the input for all projections
private double[] pixel = new double[3]; // The output for all projections
{
getStyle().setRelativePosition(org.opensourcephysics.display3d.core.Style.NORTH_EAST);
}
// -------------------------------------
// Abstract part of Element or Parent methods overwritten
// -------------------------------------
Object3D[] getObjects3D() {
if(!isReallyVisible()) {
return null;
}
if(hasChanged()) {
computeDivisions();
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.setStroke(getRealStyle().getLineStroke());
_g2.setColor(theColor);
_g2.drawLine(aCoord[_index], bCoord[_index], aCoord[_index+1], bCoord[_index+1]);
}
synchronized void drawQuickly(Graphics2D _g2) {
if(!isReallyVisible()) {
return;
}
if(hasChanged()) {
computeDivisions();
projectPoints();
} else if(needsToProject()) {
projectPoints();
}
_g2.setStroke(getRealStyle().getLineStroke());
_g2.setColor(getRealStyle().getLineColor());
_g2.drawLine(aCoord[0], bCoord[0], aCoord[div], bCoord[div]);
}
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()) {
computeDivisions();
projectPoints();
} else if(needsToProject()) {
projectPoints();
}
if(targetPosition.isEnabled()&&(Math.abs(aCoord[0]-x)<SENSIBILITY)&&(Math.abs(bCoord[0]-y)<SENSIBILITY)) {
return targetPosition;
}
if(targetSize.isEnabled()&&(Math.abs(aCoord[div]-x)<SENSIBILITY)&&(Math.abs(bCoord[div]-y)<SENSIBILITY)) {
return targetSize;
}
return null;
}
// -------------------------------------
// Private methods
// -------------------------------------
void projectPoints() {
for(int i = 0; i<div; i++) {
getDrawingPanel3D().project(points[i], pixel);
aCoord[i] = (int) pixel[0];
bCoord[i] = (int) pixel[1];
for(int j = 0; j<3; j++) {
coordinates[j] = (points[i][j]+points[i+1][j])/2; // The middle point
}
getDrawingPanel3D().project(coordinates, pixel);
objects[i].setDistance(pixel[2]*getStyle().getDepthFactor());
}
// Project last point
getDrawingPanel3D().project(points[div], pixel);
aCoord[div] = (int) pixel[0];
bCoord[div] = (int) pixel[1];
setNeedToProject(false);
}
final void computeDivisions() {
int theDiv = 1;
org.opensourcephysics.display3d.core.Resolution res = getRealStyle().getResolution();
if(res!=null) {
switch(res.getType()) {
case org.opensourcephysics.display3d.core.Resolution.MAX_LENGTH :
theDiv = Math.max((int) Math.round(0.49+getDiagonalSize()/res.getMaxLength()), 1);
break;
case org.opensourcephysics.display3d.core.Resolution.DIVISIONS :
theDiv = Math.max(res.getN1(), 1);
break;
}
}
if(div!=theDiv) { // Reallocate arrays
div = theDiv;
points = new double[div+1][3];
aCoord = new int[div+1];
bCoord = new int[div+1];
objects = new Object3D[div];
for(int i = 0; i<div; i++) {
objects[i] = new Object3D(this, i);
}
}
double first = 0, last = 1;
switch(getStyle().getRelativePosition()) {
default :
first = 0;
last = 1;
break;
case org.opensourcephysics.display3d.core.Style.CENTERED :
first = -0.5;
last = 0.5;
break;
case org.opensourcephysics.display3d.core.Style.SOUTH_WEST :
first = 1;
last = 0;
break;
}
points[0][0] = points[0][1] = points[0][2] = first;
points[div][0] = points[div][1] = points[div][2] = last;
double delta = (last-first)/div;
for(int i = 1; i<div; i++) {
points[i][0] = points[i][1] = points[i][2] = first+i*delta;
}
for(int i = 0; i<=div; i++) {
sizeAndToSpaceFrame(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.ElementSegment.Loader {
public Object createObject(XMLControl control) {
return new ElementSegment();
}
}
}
/*
* 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
*/