Andengine矩形的绘制和坐标点的关系

最新推荐文章于 2019-06-11 16:16:24 发布

wode_111

最新推荐文章于 2019-06-11 16:16:24 发布

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CC 4.0 BY-SA版权

文章标签： AndEngine 图形

本文链接：https://blog.youkuaiyun.com/wode_111/article/details/8962674

本文介绍了一个使用AndEngine框架开发的简单游戏示例，包括如何设置游戏引擎选项、创建场景、绘制图形以及实现触摸屏截图功能。通过该示例可以了解AndEngine的基本用法。

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package cn.zp;

import org.andengine.engine.camera.Camera;
import org.andengine.engine.options.EngineOptions;
import org.andengine.engine.options.ScreenOrientation;
import org.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;
import org.andengine.entity.Entity;
import org.andengine.entity.primitive.Rectangle;
import org.andengine.entity.scene.IOnSceneTouchListener;
import org.andengine.entity.scene.Scene;
import org.andengine.entity.scene.background.Background;
import org.andengine.entity.util.FPSLogger;
import org.andengine.entity.util.ScreenCapture;
import org.andengine.entity.util.ScreenCapture.IScreenCaptureCallback;
import org.andengine.input.touch.TouchEvent;
import org.andengine.ui.activity.SimpleBaseGameActivity;
import org.andengine.util.FileUtils;

import android.widget.Toast;

/**
* (c) 2010 Nicolas Gramlich (c) 2011 Zynga Inc.
*
* @author Nicolas Gramlich
* @since 11:54:51 - 03.04.2010
*/
public class MainActivity extends SimpleBaseGameActivity {
// ===========================================================
// Constants
// ===========================================================

private static final int CAMERA_WIDTH = 720;
private static final int CAMERA_HEIGHT = 480;

// ===========================================================
// Fields
// ===========================================================

// ===========================================================
// Constructors
// ===========================================================

// ===========================================================
// Getter & Setter
// ===========================================================

// ===========================================================
// Methods for/from SuperClass/Interfaces
// ===========================================================

@Override
public EngineOptions onCreateEngineOptions() {
final Camera camera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED,
new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), camera);
}

@Override
public void onCreateResources() {

}

@Override
public Scene onCreateScene() {
this.mEngine.registerUpdateHandler(new FPSLogger());

  final Scene scene = new Scene();
  final ScreenCapture screenCapture = new ScreenCapture();
  scene.attachChild(screenCapture);
  scene.setOnSceneTouchListener(new IOnSceneTouchListener() {
   @Override
   public boolean onSceneTouchEvent(final Scene pScene,
     final TouchEvent pSceneTouchEvent) {
    if (pSceneTouchEvent.isActionDown()) {
     screenCapture.capture(180, 60, 360, 360, FileUtils
       .getAbsolutePathOnExternalStorage(
         MainActivity.this,
         "Screen_" + System.currentTimeMillis()
           + ".png"),
       new IScreenCaptureCallback() {
        @Override
        public void onScreenCaptured(
          final String pFilePath) {
         MainActivity.this
           .runOnUiThread(new Runnable() {
            @Override
            public void run() {
             Toast.makeText(
               MainActivity.this,
               "Screenshot: "
                 + pFilePath
                 + " taken!",
               Toast.LENGTH_SHORT)
               .show();
            }
           });
        }

        @Override
        public void onScreenCaptureFailed(
          final String pFilePath,
          final Exception pException) {
         MainActivity.this
           .runOnUiThread(new Runnable() {
            @Override
            public void run() {
             Toast.makeText(
               MainActivity.this,
               "FAILED capturing Screenshot: "
                 + pFilePath
                 + " !",
               Toast.LENGTH_SHORT)
               .show();
            }
           });
        }
       });
    }
    return true;
   }
  });

scene.setBackground(new Background(0, 0, 0));

  /* Create the rectangles. */
  final Rectangle rect1 = this.makeColoredRectangle(-180, -180, 1, 0, 0);
  final Rectangle rect2 = this.makeColoredRectangle(0, -180, 0, 1, 0);
  final Rectangle rect3 = this.makeColoredRectangle(0, 0, 0, 0, 1);
  final Rectangle rect4 = this.makeColoredRectangle(-180, 0, 1, 1, 0);

final Entity rectangleGroup = new Entity(CAMERA_WIDTH / 2,
CAMERA_HEIGHT / 2);

  rectangleGroup.attachChild(rect1);
  rectangleGroup.attachChild(rect2);
  rectangleGroup.attachChild(rect3);
  rectangleGroup.attachChild(rect4);

scene.attachChild(rectangleGroup);

return scene;
}

private Rectangle makeColoredRectangle(final float pX, final float pY,
   final float pRed, final float pGreen, final float pBlue) {
  final Rectangle coloredRect = new Rectangle(pX, pY, 180, 180,
    this.getVertexBufferObjectManager());
  coloredRect.setColor(pRed, pGreen, pBlue);
  return coloredRect;
}

// ===========================================================
// Methods
// ===========================================================

// ===========================================================
// Inner and Anonymous Classes
// ===========================================================
}

小结：正确理解屏幕坐标有利于我们更好的绘制图形，以及所绘制图形的相对关系