/* * Copyright (C) 2008 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.example.android.apis.graphics;import android.app.Activity;import android.content.Context;import android.graphics.*;import android.os.Bundle;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.*;public class Patterns extends GraphicsActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(new SampleView(this));    }        private static Bitmap makeBitmap1() {        Bitmap bm = Bitmap.createBitmap(40, 40, Bitmap.Config.RGB_565);        Canvas c = new Canvas(bm);        c.drawColor(Color.RED);        Paint p = new Paint();        p.setColor(Color.BLUE);        c.drawRect(5, 5, 35, 35, p);        return bm;    }        private static Bitmap makeBitmap2() {        Bitmap bm = Bitmap.createBitmap(64, 64, Bitmap.Config.ARGB_8888);        Canvas c = new Canvas(bm);        Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);        p.setColor(Color.GREEN);        p.setAlpha(0xCC);        c.drawCircle(32, 32, 27, p);        return bm;    }        private static class SampleView extends View {        private final Shader mShader1;        private final Shader mShader2;        private final Paint mPaint;        private final DrawFilter mFastDF;                private float mTouchStartX;        private float mTouchStartY;        private float mTouchCurrX;        private float mTouchCurrY;        private DrawFilter mDF;        public SampleView(Context context) {            super(context);            setFocusable(true);            setFocusableInTouchMode(true);            mFastDF = new PaintFlagsDrawFilter(Paint.FILTER_BITMAP_FLAG |                                               Paint.DITHER_FLAG,                                               0);                mShader1 = new BitmapShader(makeBitmap1(), Shader.TileMode.REPEAT,                                        Shader.TileMode.REPEAT);            mShader2 = new BitmapShader(makeBitmap2(), Shader.TileMode.REPEAT,                                        Shader.TileMode.REPEAT);                        Matrix m = new Matrix();            m.setRotate(30);            mShader2.setLocalMatrix(m);                        mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);        }                @Override protected void onDraw(Canvas canvas) {            canvas.setDrawFilter(mDF);            mPaint.setShader(mShader1);            canvas.drawPaint(mPaint);                        canvas.translate(mTouchCurrX - mTouchStartX,                             mTouchCurrY - mTouchStartY);            mPaint.setShader(mShader2);            canvas.drawPaint(mPaint);        }        @Override        public boolean onTouchEvent(MotionEvent event) {            float x = event.getX();            float y = event.getY();                        switch (event.getAction()) {                case MotionEvent.ACTION_DOWN:                    mTouchStartX = mTouchCurrX = x;                    mTouchStartY = mTouchCurrY = y;                    mDF = mFastDF;                    invalidate();                    break;                case MotionEvent.ACTION_MOVE:                    mTouchCurrX = x;                    mTouchCurrY = y;                    invalidate();                    break;                case MotionEvent.ACTION_UP:                    mDF = null;                    invalidate();                    break;            }            return true;        }    }}