package com.pumba22.paintexample;

import android.app.Activity;
import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;

public class PaintActivity extends Activity implements ColorPickDialog.OnColorChangedListener {

    private Paint mPaint;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new PaintView(this));

        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setColor(0xFF000000);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(12);
    }

    public void colorChanged(int color){
        mPaint.setColor(color);
    }

    class PaintView extends View {

        private Bitmap mBitmap;
        private Canvas mCanvas;
        private Path mPath;
        private Paint mBitmapPaint;

        public PaintView(Context context) {
            super(context);

            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);

            mBitmap = Bitmap.createBitmap(w,h,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);
            mCanvas.drawPath(mPath, mPaint);
            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;
        }

    }

    private static final int COLOR_MENU_ID = Menu.FIRST;
    private static final int ERASE_MENU_ID = Menu.FIRST+1;

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);

        menu.add(0,COLOR_MENU_ID,0,"Color").setShortcut('3', 'c');
        menu.add(0, ERASE_MENU_ID, 0, "Erase").setShortcut('5', 'z');

        return true;
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        return super.onPrepareOptionsMenu(menu);
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        mPaint.setXfermode(null);
        mPaint.setAlpha(0xFF);

        switch (item.getItemId()) {
        case COLOR_MENU_ID:
                new ColorPickDialog(this,this, mPaint.getColor()).show();
                return true;
        case ERASE_MENU_ID:
                mPaint.setXfermode(new PorterDuffXfermode(
                        PorterDuff.Mode.CLEAR));
                return true;
        }

        return super.onOptionsItemSelected(item);
    }







}