package testVertex;

import javax.microedition.lcdui.*;
import javax.microedition.m3g.*;

public class VertexCanvas extends Canvas implements Runnable {

	private Graphics3D _graphics3d = null;

	private VertexArray vertexArray, colorArray;

	private VertexBuffer vertexBuffer;

	private IndexBuffer triangles;

	private Appearance appearance;

	private Light light;

	private Camera camera = null;

	public VertexCanvas() {

		_graphics3d = Graphics3D.getInstance();

		byte vertrices[] = new byte[] { -1, 0, 0, 1, 0, 0, 1, 1, 0, -1, 1, 0 };

		byte vertex_colors[] = { (byte) 255, 0, 0, 0, (byte) 255, 0, 0, 0,
				(byte) 255, 0, (byte) 255, (byte) 255 };

		vertexArray = new VertexArray(vertrices.length / 3, 3, 1);
		vertexArray.set(0, vertrices.length / 3, vertrices);

		colorArray = new VertexArray(vertex_colors.length / 3, 3, 1);
		colorArray.set(0, vertex_colors.length / 3, vertex_colors);

		vertexBuffer = new VertexBuffer();
		vertexBuffer.setPositions(vertexArray, 1.0f, null);
		vertexBuffer.setColors(colorArray);

		int indices[] = new int[] { 0, 1, 3, 2 };
		int[] stripLengths = new int[] { 4 };

		triangles = new TriangleStripArray(indices, stripLengths);

		appearance = new Appearance();
		PolygonMode pm = new PolygonMode();
		pm.setCulling(PolygonMode.CULL_NONE);
		pm.setShading(PolygonMode.SHADE_FLAT);
		appearance.setPolygonMode(pm);

		camera = new Camera();
		camera.setTranslation(0, 0, 5);

		float aspect = (float) getWidth() / (float) getHeight();
		camera.setPerspective(30.0f, aspect, 1.0f, 1000.0f);
		Transform camTransform = new Transform();
		camTransform.postTranslate(0.0f, 0.0f, 5.0f);
		_graphics3d.setCamera(camera, camTransform);

		light = new Light();
		light.setColor(0xffffff); // 設(shè)置為白色光線t
		light.setIntensity(1.25f);

		Thread thread = new Thread(this);
		thread.start();
	}

	protected void paint(Graphics g) {
		_graphics3d.bindTarget(g);
		_graphics3d.clear(null);
		_graphics3d.render(vertexBuffer, triangles, appearance, null);
		_graphics3d.releaseTarget();
	}

	public void run() {

		while (true) {
			try {
				Thread.sleep(40);
			} catch (Exception e) {
				e.printStackTrace();
			}

			repaint();
		}

	}

}