JME基础教程代码分析4

package com.hello;

import com.jme3.app.SimpleApplication;

import com.jme3.material.Material;

import com.jme3.math.ColorRGBA;

import com.jme3.math.Vector3f;

import com.jme3.scene.Geometry;

import com.jme3.scene.shape.Box;

/** Sample 4 - how to trigger repeating actions from the main update loop.

* In this example, we make the player character rotate. */

public class HelloLoop extends SimpleApplication {

public static void main(String[] args){

HelloLoop app = new HelloLoop();

app.start();

}

//被操作的几何体主体

protected Geometry player;

@Override

public void simpleInitApp() {

Box b = new Box(Vector3f.ZERO, 1, 1, 1);

player = new Geometry("blue cube", b);

Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");

mat.setColor("Color", ColorRGBA.Blue);

player.setMaterial(mat);

rootNode.attachChild(player);

}

/* This is the update loop */

//又是一个重载方法，现在就知道它是由Application的update方法回调的，更新场景。以后再分析SimpleApplication和Application代码

//tpf可以理解为单位时间内的速度值

@Override

public void simpleUpdate(float tpf) {

// make the player rotate

player.rotate(0, 2*tpf, 0);

}

}