Android Open Source - model-explorer Main G L Surface View

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License

The source code is released under:

Apache License

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Java Source Code

package com.etaoin.myopengltest.core.main.views;
//  w ww . j a v a2  s .c om
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.view.MotionEvent;
import com.etaoin.myopengltest.core.main.context.ContextManager;
import com.etaoin.myopengltest.util.camera.Camera;
import com.etaoin.myopengltest.util.geometry.Vector3;

/**
 * Main View for the test application.
 */
public class MainGLSurfaceView extends GLSurfaceView {

  private static final int OPEN_GL_ES_VERSION = 2;
  private static final float ROTATION_FACTOR = 0.15f;
  private ContextManager contextManager;
  // TODO Move to it's own module/class
  private float previousX;
  private float previousY;

  public MainGLSurfaceView(Context context, Renderer renderer, ContextManager contextManager) {
    super(context);

    this.contextManager = contextManager;
    previousX = 0f;
    previousY = 0f;
    setEGLContextClientVersion(OPEN_GL_ES_VERSION);
    setRenderer(renderer);
    setRenderMode(GLSurfaceView.RENDERMODE_CONTINUOUSLY);
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    float x = event.getX();
    float y = event.getY();

    switch (event.getAction()) {
      case MotionEvent.ACTION_MOVE:
        float dx = x - previousX;
        float dy = y - previousY;

        Camera camera = contextManager.getCurrentContext().getCamera();
        Vector3 cameraPosition = camera.getPosition();
        Vector3 cameraLookAt = camera.getLookAt();
        Vector3 crossX = Vector3.sub(cameraPosition, cameraLookAt)
            .setZ(0f)
            .normalize()
            .cross(new Vector3(1f, 0f, 0f));
        float crossXNorm = crossX.norm();

        camera.rotateX((crossXNorm) * -dy * ROTATION_FACTOR);
        camera.rotateY((1 - crossXNorm) * -dy * ROTATION_FACTOR);
        camera.rotateZ(dx * ROTATION_FACTOR);

        previousX = x;
        previousY = y;
        break;
      case MotionEvent.ACTION_DOWN:
        previousX = x;
        previousY = y;
        break;
    }

    return true;
  }
}

Java Source Code List