Android Open Source - android_opengles Planet

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License

The source code is released under:

MIT License

Java Source Code

package com.example.opengles;
//from w  w  w .j a  va 2  s .  com
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import javax.microedition.khronos.opengles.GL10;

public class Planet {
  FloatBuffer mVertexData;
  FloatBuffer mNormalData;
  FloatBuffer mColorData;

  float mScale;
  float mSquash;
  float mRadius;

  int mStacks;
  int mSlices;

  public Planet(int stacks, int slices, float radius, float squash) {
    this.mStacks = stacks;
    this.mSlices = slices + 1;
    this.mRadius = radius;
    this.mSquash = squash;
    init();
  }

  private void init() {
    float[] vertexData;
    float[] colorData;
    float colorIncrement = 1.0f / (float) mStacks;

    float blue = 0f;
    float red = 1.0f;
    int numVertices = 0;
    int vIndex = 0;
    int cIndex = 0;

    mScale = mRadius;

    vertexData = new float[3 * mSlices * 2 * mStacks];
    colorData = new float[4 * mSlices * 2 * mStacks];

    for (int i = 0; i < mStacks; i++) {
      float phi0 = (float) Math.PI * ((float) (i + 0) * (1.0f / (float) mStacks) - 0.5f);
      float phi1 = (float) Math.PI * ((float) (i + 1) * (1.0f / (float) mStacks) - 0.5f);
      float cosPhi0 = (float) Math.cos(phi0);
      float sinPhi0 = (float) Math.sin(phi0);
      float cosPhi1 = (float) Math.cos(phi1);
      float sinPhi1 = (float) Math.sin(phi1);
      for (int j = 0; j < mSlices; j++) {
        float theta = -2.0f * (float) Math.PI * (float) j * (1.0f / (float) (mSlices - 1));
        float costheta = (float) Math.cos(theta);
        float sintheta = (float) Math.sin(theta);
        vertexData[vIndex + 0] = mScale * cosPhi0 * costheta;
        vertexData[vIndex + 1] = mScale * sinPhi0 * mSquash;
        vertexData[vIndex + 2] = mScale * cosPhi0 * sintheta;

        vertexData[vIndex + 3] = mScale * cosPhi1 * costheta;
        vertexData[vIndex + 4] = mScale * sinPhi1 * mSquash;
        vertexData[vIndex + 5] = mScale * cosPhi1 * sintheta;

        colorData[cIndex + 0] = red;
        colorData[cIndex + 1] = 0f;
        colorData[cIndex + 2] = blue;
        colorData[cIndex + 3] = 1f;

        colorData[cIndex + 4] = red;
        colorData[cIndex + 5] = 0f;
        colorData[cIndex + 6] = blue;
        colorData[cIndex + 7] = 1f;

        vIndex += 6;
        cIndex += 8;
      }
      blue += colorIncrement;
      red -= colorIncrement;
    }
    mVertexData = makeFloatBuffer(vertexData);
    mColorData = makeFloatBuffer(colorData);
  }

  public void draw(GL10 gl) {
    gl.glFrontFace(GL10.GL_CW);

    gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mVertexData);
    gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);

    gl.glColorPointer(4, GL10.GL_FLOAT, 0, mColorData);
    gl.glEnableClientState(GL10.GL_COLOR_ARRAY);

    gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, mSlices * 2 * mStacks);
  }

  private FloatBuffer makeFloatBuffer(float[] data) {
    ByteBuffer bb = ByteBuffer.allocateDirect(data.length * 4);
    bb.order(ByteOrder.nativeOrder());
    FloatBuffer fb = bb.asFloatBuffer();
    fb.put(data);
    fb.position(0);
    return fb;
  }

}

Java Source Code List

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