| /* |
| * 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; |
| } |
| } |
| } |
| |