CanvasActivityGenerator.java

/**
* Copyright 2012 Neurowork Consulting S.L.
*
* This file is part of eMobc.
*
* CanvasActivityGenerator.java
* eMobc Android Framework
*
* eMobc is free software: you can redistribute it and/or modify
* it under the terms of the Affero GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* eMobc is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the Affero GNU General Public License
* along with eMobc. If not, see <http://www.gnu.org/licenses/>.
*
*/
package com.emobc.android.activities.generators;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.EmbossMaskFilter;
import android.graphics.MaskFilter;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.MotionEvent;
import android.view.View;
import android.widget.RelativeLayout;

import com.emobc.android.ActivityType;
import com.emobc.android.NextLevel;
import com.emobc.android.activities.R;
import com.emobc.android.levels.AppLevel;
import com.emobc.android.levels.AppLevelData;

/**
 * Screen generator, responsible for specific components to initialize the 
 * display type "CANVAS". It also creates the menus, rotations, and the format for 
 * the components.
 * 
 * @author Jorge E. Villaverde
 * @author Jonatan Alcocer Luna
 * @version 0.1
 * @since 0.1
 */
public class CanvasActivityGenerator extends LevelActivityGenerator{
    /**
	 * 
	 */
	private static final long serialVersionUID = -5679903393500880524L;

	public CanvasActivityGenerator(AppLevel appLevel, NextLevel nextLevel) {
		super(appLevel, nextLevel);
	}

	private Paint       mPaint;
    private MaskFilter  mEmboss;
    private MaskFilter  mBlur;
	
	public class MyView extends View {
        
        private static final float MINP = 0.25f;
        private static final float MAXP = 0.75f;
        
        private Bitmap  mBitmap;
        private Canvas  mCanvas;
        private Path    mPath;
        private Paint   mBitmapPaint;
        
        public MyView(Context c) {
            super(c);
            mBitmap = Bitmap.createBitmap(640, 960, Bitmap.Config.ARGB_8888);
            mCanvas = new Canvas(mBitmap);
            mPath = new Path();
            mBitmapPaint = new Paint(Paint.DITHER_FLAG);
        }

        @Override
        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
            super.onSizeChanged(w, h, oldw, oldh);
        }
        
        public void adaptToScreen(int width, int height){
        	mBitmap = Bitmap.createBitmap(width,height, Bitmap.Config.ARGB_8888);
        	mCanvas = new Canvas(mBitmap);
        }
        
        @Override
        protected void onDraw(Canvas canvas) {
            canvas.drawColor(0xFFAAAAAA);
            
            canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
            
            canvas.drawPath(mPath, mPaint);
        }
        
        private float mX, mY;
        private static final float TOUCH_TOLERANCE = 4;
        
        private void touch_start(float x, float y) {
            mPath.reset();
            mPath.moveTo(x, y);
            mX = x;
            mY = y;
        }
        private void touch_move(float x, float y) {
            float dx = Math.abs(x - mX);
            float dy = Math.abs(y - mY);
            if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
                mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
                mX = x;
                mY = y;
            }
        }
        private void touch_up() {
            mPath.lineTo(mX, mY);
            // commit the path to our offscreen
            mCanvas.drawPath(mPath, mPaint);
            // kill this so we don't double draw
            mPath.reset();
        }
        
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            float x = event.getX();
            float y = event.getY();
            
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    touch_start(x, y);
                    invalidate();
                    break;
                case MotionEvent.ACTION_MOVE:
                    touch_move(x, y);
                    invalidate();
                    break;
                case MotionEvent.ACTION_UP:
                    touch_up();
                    invalidate();
                    break;
            }
            return true;
        }
    }

	@Override
	protected void loadAppLevelData(Activity activity, AppLevelData data) {
		RelativeLayout content = (RelativeLayout) activity.findViewById(R.id.contentLayout);
		View parent = activity.findViewById(R.id.parent);
        MyView view = new MyView(activity);
		content.addView(view);
		mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setColor(0xFFFF0000);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(12);
        
        mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 },
                                       0.4f, 6, 3.5f);

        mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
		
	}

	@Override
	protected int getContentViewResourceId(Activity activity) {
		if(appLevel.getXib() != null && appLevel.getXib().length() > 0){
			int id = getActivityLayoutIdFromString(activity, appLevel.getXib());
			if(id >0)
				return id;
		}
		return R.layout.canvas_layout;
	}

	@Override
	protected ActivityType getActivityGeneratorType() {
		return ActivityType.CANVAS_ACTIVITY;
	}
}