Android Open Source - agldemo Lesson04

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License

The source code is released under:

Copyright (c) 2013 Wenhao Li Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software...

Java Source Code

/**
 * Copyright (C) 2010 Wenhao Li. All Rights Reserved.
 * //from ww w . j a  v  a2s . c o  m
 */
package com.agldemo.lessons;

import java.nio.FloatBuffer;

import javax.microedition.khronos.opengles.GL10;

import android.content.Context;
import android.opengl.GLU;

import com.agldemo.Lesson;


/**
 * Lesson 02
 */
public class Lesson04 extends Lesson {

  FloatBuffer triangle = makeFloatBuffer(new float[] {
      // Top Of Triangle
      0.0f, 1.0f, 0.0f,
      // Left Of Triangle
      -1.0f, -1.0f, 0.0f,
      // Right Of Triangle
      1.0f, -1.0f, 0.0f });

  FloatBuffer tcolor = makeFloatBuffer(new float[] {
      // Red
      1.0f, 0.0f, 0.0f, 1.0f,
      // Green
      0.0f, 1.0f, 0.0f, 1.0f,
      // Blue
      0.0f, 0.0f, 1.0f, 1.0f });

  FloatBuffer quad = makeFloatBuffer(new float[] {
      // Top Right Of The Quad
      1.0f, 1.0f, 0.0f,
      // Top Left Of The Quad
      -1.0f, 1.0f, 0.0f,
      // Bottom Left Of The Quad
      1.0f, -1.0f, 0.0f,
      // Bottom Right Of The Quad
      -1.0f, -1.0f, 0.0f });

  float rtri = 0.0f;
  float rquad = 0.0f;

  public Lesson04(Context c) {
    super(c, "Lesson 04", "Rotation");
  }

  public void onDrawFrame(GL10 gl, int width, int height) {
    float ratio = (float) width / height;
    gl.glMatrixMode(GL10.GL_PROJECTION);
    gl.glLoadIdentity();
    GLU.gluPerspective(gl, 45.0f, ratio, 0.1f, 100.0f);

    gl.glMatrixMode(GL10.GL_MODELVIEW);

    gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);

    // triangle
    gl.glEnableClientState(GL10.GL_COLOR_ARRAY);

    gl.glLoadIdentity();
    gl.glTranslatef(-1.5f, 0.0f, -6.0f);
    gl.glRotatef(rtri, 0.0f, 1.0f, 0.0f);

    gl.glColorPointer(4, GL10.GL_FLOAT, 0, tcolor);
    gl.glVertexPointer(3, GL10.GL_FLOAT, 0, triangle);

    gl.glDrawArrays(GL10.GL_TRIANGLES, 0, 3);

    gl.glDisableClientState(GL10.GL_COLOR_ARRAY);

    // quad
    gl.glLoadIdentity();
    gl.glTranslatef(1.5f, 0.0f, -6.0f);
    gl.glRotatef(rquad, 1.0f, 0.0f, 0.0f);

    gl.glColor4f(0.5f, 0.5f, 1.0f, 1.0f);

    gl.glVertexPointer(3, GL10.GL_FLOAT, 0, quad);

    gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);

    gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);

    // clean up
    gl.glColor4f(1.0f, 1.0f, 1.0f, 1.0f);

    // change rotation
    rtri += 2.0f;
    rquad -= 1.5f;
  }

}

Java Source Code List

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