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/*
* 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.content.Context;
import android.graphics.*;
import android.os.Bundle;
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;
}
}
}
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