Java版WorldWind中加入会运动模型
洪鸿
在worldwind sdk中的gov.nasa.worldwind.geom，这个包是存放一些几何模型的。
我使用的是球类Sphere，它是使用OpenGL画出来的。
参考这个类进行了一定的修改成为PlaneRender.java 代码如下:
import gov.nasa.worldwind.View;
import gov.nasa.worldwind.geom.Extent;
import gov.nasa.worldwind.geom.Frustum;
import gov.nasa.worldwind.geom.Intersection;
import gov.nasa.worldwind.geom.Line;
import gov.nasa.worldwind.geom.Plane;
import gov.nasa.worldwind.geom.Vec4;
import gov.nasa.worldwind.render.*;
import gov.nasa.worldwind.util.Logging;
import java.awt.Color;
public final class PlaneRender implements Extent, Renderable
{
private Vec4 center;
private double radius;
private boolean sphereFilled = false;
private Color sphereColor = Color.RED;
private int numDivisions = 8; // number of horizontal and verticle divisions in the sphere
boolean plotFixedAxis = false;
// improve performance keep from creating a new one all the time
javax.media.opengl.glu.GLUquadric quadric;
/**
* Creates a new <code>Sphere</code> from a given center and radius. <code>radius</code> must be positive (that is,
* greater than zero), and <code>center</code> may not be null.
*
* @param center the center of the new sphere
* @param radius the radius of the new sphere
* @param isfilled if the sphere is filled (else wireframe)
* @throws IllegalArgumentException if <code>center</code> is null or if <code>radius</code> is non-positive
*/
public PlaneRender(Vec4 center, double radius, boolean isfilled)
{
if (center == null)
{
String message = Logging.getMessage("nullValue.CenterIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (radius <= 0)
{
String message = Logging.getMessage("Geom.Sphere.RadiusIsZeroOrNegative", radius);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.center = center;
this.radius = radius;
this.sphereFilled = isfilled;
}
/**
* Obtains the center of this <code>Sphere</code>.
*
* @return the <code>Vec4</code> situated at the center of this <code>Sphere</code>
*/
public final Vec4 getCenter()
{
return this.center;
}
/**
* Causes this <code>Sphere</code> to render itself using the <code>DrawContext</code> provided. <code>dc</code> may
* not be null.
*
* @param dc the <code>DrawContext</code> to be used
* @throws IllegalArgumentException if <code>dc</code> is null
*/
public void render(DrawContext dc)
{
if (dc == null)
{
String msg = Logging.getMessage("nullValue.DrawContextIsNull");
Logging.logger().severe(msg);
throw new IllegalArgumentException(msg);
}
javax.media.opengl.GL gl = dc.getGL();
gl.glPushAttrib(javax.media.opengl.GL.GL_TEXTURE_BIT | javax.media.opengl.GL.GL_ENABLE_BIT
| javax.media.opengl.GL.GL_CURRENT_BIT);
gl.glDisable(javax.media.opengl.GL.GL_TEXTURE_2D);
gl.glColor3d( sphereColor.getRed()/255.0 , sphereColor.getGreen()/255.0 , sphereColor.getBlue()/255.0 ); // COLOR
gl.glMatrixMode(javax.media.opengl.GL.GL_MODELVIEW);
gl.glPushMatrix();
// gl.glTranslated(this.center.x, this.center.y, this.center.z);
gl.glTranslated(5046634.313882601, 2081316.7191214513, 4414638.612102969);
if(quadric == null)
{
quadric = dc.getGLU().gluNewQuadric();
}
if(sphereFilled)
{
dc.getGLU().gluQuadricDrawStyle(quadric, javax.media.opengl.glu.GLU.GLU_FILL);
}
else // lines
{
dc.getGLU().gluQuadricDrawStyle(quadric, javax.media.opengl.glu.GLU.GLU_LINE);
}
dc.getGLU().gluSphere(quadric, this.radius, numDivisions, numDivisions);
// Draw in axis
if(plotFixedAxis)
{
gl.glLineWidth(3.0f);
gl.glColor3d(1, 0, 0); // COLOR
gl.glBegin(gl.GL_LINES);
gl.glVertex3d(radius * 3, 0, 0);
gl.glVertex3d(0, 0, 0);
gl.glEnd();
// Draw in axis
gl.glColor3d(0, 1, 0); // COLOR
gl.glBegin(gl.GL_LINES);
gl.glVertex3d(0, radius * 3, 0);
gl.glVertex3d(0, 0, 0);
gl.glEnd();
// Draw in axis
gl.glColor3d(0, 0, 1); // COLOR
gl.glBegin(gl.GL_LINES);
gl.glVertex3d(0, 0, radius * 3);
gl.glVertex3d(0, 0, 0);
gl.glEnd();
}
gl.glPopMatrix();
dc.getGLU().gluDeleteQuadric(quadric);
gl.glPopAttrib();
}
@Override
public String toString()
{
return "Sphere: center = " + this.center.toString() + " radius = " + Double.toString(this.radius);
}
@Override
public boolean equals(Object o)
{
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
final PlaneRender sphere = (PlaneRender) o;
if (Double.compare(sphere.radius, radius) != 0)
return false;
if (!center.equals(sphere.center))
return false;
return true;
}
@Override
public int hashCode()
{
int result;
long temp;
result = center.hashCode();
temp = radius != +0.0d ? Double.doubleToLongBits(radius) : 0L;
result = 29 * result + (int) (temp ^ (temp >>> 32));
return result;
}
public boolean isSphereFilled()
{
return sphereFilled;
}
public void setSphereFilled(boolean sphereFilled)
{
this.sphereFilled = sphereFilled;
}
public Color getColor()
{
return sphereColor;
}
public void setColor(Color sphereColor)
{
this.sphereColor = sphereColor;
}
public int getNumDivisions()
{
return numDivisions;
}
public void setNumDivisions(int numDivisions)
{
this.numDivisions = numDivisions;
}
public void setCenter(Vec4 center)
{
this.center = center;
}
public void setCenter(double x, double y, double z)
{
this.center = new Vec4(x,y,z,0.0);
}
public double getEffectiveRadius(Plane arg0) {
// TODO Auto-generated method stub
return 0;
}
public double getProjectedArea(View arg0) {
// TODO Auto-generated method stub
return radius;
}
public boolean isEnabled() {
// TODO Auto-generated method stub
return true;
}
@Override
public Intersection[] intersect(Line arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public boolean intersects(Frustum arg0) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean intersects(Line arg0) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean intersects(Plane arg0) {
// TODO Auto-generated method stub
return false;
}
}
测试中使用的是最简单的一个例子HelloWorldWind类。代码如下
import java.awt.Color;
import gov.nasa.worldwind.*;
import gov.nasa.worldwind.awt.WorldWindowGLCanvas;
import gov.nasa.worldwind.geom.Angle;
import gov.nasa.worldwind.geom.Position;
import gov.nasa.worldwind.geom.Sphere;
import gov.nasa.worldwind.geom.Vec4;
import gov.nasa.worldwind.globes.Globe;
import gov.nasa.worldwind.layers.CompassLayer;
import gov.nasa.worldwind.layers.Layer;
import gov.nasa.worldwind.layers.LayerList;
import gov.nasa.worldwind.layers.RenderableLayer;
public class HelloWorldWind
{
private static class AppFrame extends javax.swing.JFrame
{
public AppFrame()
{
RenderableLayer rayLayer = new RenderableLayer();
double sphereRadius = 100000;
PlaneRender sphere = new PlaneRender(new Vec4(0,0,0,0), sphereRadius, true);
sphere.setColor(Color.RED);
rayLayer.addRenderable(sphere);
WorldWindowGLCanvas wwd = new WorldWindowGLCanvas();
wwd.setPreferredSize(new java.awt.Dimension(1000, 800));
this.getContentPane().add(wwd, java.awt.BorderLayout.CENTER);
this.pack();
wwd.setModel(new BasicModel());
wwd.getModel().getLayers().add(rayLayer);
}
}
public static void main(String[] args)
{
if (Configuration.isMacOS())
{
System.setProperty("com.apple.mrj.application.apple.menu.about.name", "Hello World Wind");
}
java.awt.EventQueue.invokeLater(new Runnable()
{
public void run()
{
new AppFrame().setVisible(true);
}
});
}
} gl.glTranslated(5046634.313882601, 2081316.7191214513, 4414638.612102969);里面参数是大地坐标。
所以出现在球上面的是一个不动的小圆球，想要移动这个球就要不断地用到 PlaneRender类里面的setCenter()方法了。
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