simple3dtest1.java

Developing Games in Java 源代码

import com.brackeen.javagamebook.test.GameCore;

import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.geom.GeneralPath;

import com.brackeen.javagamebook.input.*;
import com.brackeen.javagamebook.math3D.*;

/**
    A 3D Test to demonstrate drawing polygons.
*/
public class Simple3DTest1 extends GameCore {

    public static void main(String[] args) {
        new Simple3DTest1().run();
    }

    // create solid-colored polygons
    private SolidPolygon3D treeLeaves = new SolidPolygon3D(
        new Vector3D(-50, -35, 0),
        new Vector3D(50, -35, 0),
        new Vector3D(0, 150, 0));

    private SolidPolygon3D treeTrunk = new SolidPolygon3D(
        new Vector3D(-5, -50, 0),
        new Vector3D(5, -50, 0),
        new Vector3D(5, -35, 0),
        new Vector3D(-5, -35, 0));

    private Transform3D treeTransform = new Transform3D(0,0,-500);
    private Polygon3D transformedPolygon = new Polygon3D();
    private ViewWindow viewWindow;

    private GameAction exit = new GameAction("exit");
    private GameAction zoomIn = new GameAction("zoomIn");
    private GameAction zoomOut = new GameAction("zoomOut");


    public void init() {
        super.init();

        InputManager inputManager = new InputManager(
            screen.getFullScreenWindow());
        inputManager.setCursor(InputManager.INVISIBLE_CURSOR);
        inputManager.mapToKey(exit, KeyEvent.VK_ESCAPE);
        inputManager.mapToKey(zoomIn, KeyEvent.VK_UP);
        inputManager.mapToKey(zoomOut, KeyEvent.VK_DOWN);

        // make the view window the entire screen
        viewWindow = new ViewWindow(0, 0,
            screen.getWidth(), screen.getHeight(),
            (float)Math.toRadians(75));

        // give the polygons color
        treeLeaves.setColor(new Color(0x008000));
        treeTrunk.setColor(new Color(0x714311));
    }


    public void update(long elapsedTime) {
        if (exit.isPressed()) {
            stop();
            return;
        }

        // cap elapsedTime
        elapsedTime = Math.min(elapsedTime, 100);

        // rotate around the y axis
        treeTransform.rotateAngleY(0.002f*elapsedTime);

        // allow user to zoom in/out
        if (zoomIn.isPressed()) {
            treeTransform.getLocation().z += 0.5f*elapsedTime;
        }
        if (zoomOut.isPressed()) {
            treeTransform.getLocation().z -= 0.5f*elapsedTime;
        }
    }


    public void draw(Graphics2D g) {
        // erase background
        g.setColor(Color.black);
        g.fillRect(0, 0, screen.getWidth(), screen.getHeight());

        // draw message
        g.setColor(Color.white);
        g.drawString("Press up/down to zoom. Press Esc to exit.",
            5, fontSize);

        // draw the tree polygons
        trandformAndDraw(g, treeTrunk);
        trandformAndDraw(g, treeLeaves);
    }


    /**
        Projects and draws a polygon onto the view window.
    */
    private void trandformAndDraw(Graphics2D g,
        SolidPolygon3D poly)
    {
        transformedPolygon.setTo(poly);

        // translate and rotate the polygon
        transformedPolygon.add(treeTransform);

        // project the polygon to the screen
        transformedPolygon.project(viewWindow);

        // convert the polygon to a Java2D GeneralPath and draw it
        GeneralPath path = new GeneralPath();
        Vector3D v = transformedPolygon.getVertex(0);
        path.moveTo(v.x, v.y);
        for (int i=1; i<transformedPolygon.getNumVertices(); i++) {
            v = transformedPolygon.getVertex(i);
            path.lineTo(v.x, v.y);
        }
        g.setColor(poly.getColor());
        g.fill(path);
    }
}