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The parameter name starts with the class name,
The parameter name starts with the class name, followed by an underscore and then the name of the constant. The value depends on the parameter type. In this case it is a string that refers to a filename. The next thing that is in common for all bouncing boxes is that their 3D model is scaled. This is because all the vertices in an F3D file are between -1 and 1 on all axes. The actual file format and how models can be imported from external applications will be described at the end of the chapter. Finally, the bounciness of the boxes is retrieved. This bounciness determines how much of the initial energy is saved after a bounce (see Listing 12-2). Listing 12-2 The BouncingBoxWorld class class BouncingBoxWorld extends fWorld { BouncingBoxWorld(Applet app){ //– make a world which is 200×200 meters with the left top corner //– at -100,-100. The world is divided into 5×5 grids super(app,-100,-100,200,5); //– insert a couple of boxes at random height for(double x=-10;x<=10;x+=10){ for(double z=-10;z<=10;z+=10){ new BouncingBox(this,new fPoint3d(x,Math.random()*30,z)); } } } protected void initiateClasses (Applet app) { BouncingBox.initiateClass(app); gravity=new Double(app.getParameter("BouncingBoxWorld_gravity")). doubleValue(); } public static double gravity; } The BouncingBoxWorld Constructor The constructor of this class takes a single parameter, the applet that has constructed it. The superclass fWorld is constructed by specifying the dimensions of the world. A couple of boxes are inserted into the world at random height above the ground. Previous Table of Contents Next
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