Android Open Source - CameraDemo Game Logic

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License

The source code is released under:

Apache License

Java Source Code

package com.binary.one.camera.demo;
//w ww .jav a2  s.c o m
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.view.MotionEvent;
import android.view.SurfaceHolder;

public class GameLogic implements Runnable {

  private SurfaceHolder mHolder = null;
  private boolean mRunning = true;

  private Camera mCamera = null;

  private final Paint mColorPaint = new Paint();
  private final RectF mBackgroundRect = new RectF();

  private DebugCallback mDebugCallback = null;
  private long mFrameCount = 0l, mLastLogUpdate = 0l;

  public static GameLogic newInstance(Context context, SurfaceHolder holder) {
    return new GameLogic(context, holder);
  }

  private GameLogic(Context context, SurfaceHolder holder) {
    mHolder = holder;

    Rect screen = mHolder.getSurfaceFrame();
    int screenWidth = screen.width();
    int screenHeight = screen.height();

    mCamera = new Camera(context, screenWidth, screenHeight);

  }

  public interface DebugCallback {
    public void updateDebugInfo(int screenWidth, int screenHeight, long frameCount);
  }

  @Override
  public void run() {
    while (mRunning) { performGameLoop(); }
  }

  private void performGameLoop() {
    Canvas canvas = mHolder.lockCanvas();

    if (canvas != null) {
      int width = canvas.getWidth();
      int height = canvas.getHeight();

      mCamera.applyTransform(canvas);

//      int red = (int) (Math.random() * Integer.MAX_VALUE);
//      int green = (int) (Math.random() * Integer.MAX_VALUE);
//      int blue = (int) (Math.random() * Integer.MAX_VALUE);
//      mColorPaint.setColor(Color.rgb(red, green, blue));

      canvas.drawColor(Color.BLACK);

      drawDebugBackground(canvas, World.Constants.WIDTH, World.Constants.HEIGHT);

      mColorPaint.setColor(Color.YELLOW);
      canvas.drawCircle(World.Constants.WIDTH / 2,
          World.Constants.HEIGHT / 2,
          100,
          mColorPaint);

      mCamera.update();

      mHolder.unlockCanvasAndPost(canvas);
    }

    logDebugInfo();
  }

  private void drawDebugBackground(Canvas canvas, float screenWidth, float screenHeight) {
    final int[] colors = new int[] { Color.RED, Color.GREEN, Color.BLUE };
    final float padding = 0f;

    float barWidth = screenWidth / colors.length;

    for (int i=0; i<colors.length; ++i) {
      float start = padding + i * barWidth;
      float end = start + barWidth;

      mBackgroundRect.set(start, 0, end, screenHeight);
      mColorPaint.setColor(colors[i]);

      canvas.drawRect(mBackgroundRect, mColorPaint);
    }
  }

  public void handleTouchEvent(MotionEvent event) {
    mCamera.handleTouchEvent(event);
  }

  public void stop() {
    mRunning = false;
  }

  public void addDebugCallback(DebugCallback callback) {
    mDebugCallback = callback;
  }

  private void logDebugInfo() {
    if (mDebugCallback == null) {
      return;
    }

    long currentTime = System.currentTimeMillis();
    long deltaTime = currentTime - mLastLogUpdate;

    if (deltaTime > 1000l) {
      Rect bounds = mHolder.getSurfaceFrame();
      mDebugCallback.updateDebugInfo(bounds.width(), bounds.height(), mFrameCount);
      mLastLogUpdate = currentTime;
      mFrameCount = 0;
    } else {
      ++mFrameCount;
    }
  }
}

Java Source Code List

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