| /* |
| * Copyright (C) 2007 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 com.example.android.apis.R; |
| |
| import android.app.Activity; |
| import android.content.Context; |
| import android.graphics.*; |
| import android.os.Bundle; |
| import android.view.KeyEvent; |
| import android.view.View; |
| |
| public class ColorMatrixSample extends GraphicsActivity { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(new SampleView(this)); |
| } |
| |
| private static class SampleView extends View { |
| private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); |
| private ColorMatrix mCM = new ColorMatrix(); |
| private Bitmap mBitmap; |
| private float mSaturation; |
| private float mAngle; |
| |
| public SampleView(Context context) { |
| super(context); |
| |
| mBitmap = BitmapFactory.decodeResource(context.getResources(), |
| R.drawable.balloons); |
| } |
| |
| private static void setTranslate(ColorMatrix cm, float dr, float dg, |
| float db, float da) { |
| cm.set(new float[] { |
| 2, 0, 0, 0, dr, |
| 0, 2, 0, 0, dg, |
| 0, 0, 2, 0, db, |
| 0, 0, 0, 1, da }); |
| } |
| |
| private static void setContrast(ColorMatrix cm, float contrast) { |
| float scale = contrast + 1.f; |
| float translate = (-.5f * scale + .5f) * 255.f; |
| cm.set(new float[] { |
| scale, 0, 0, 0, translate, |
| 0, scale, 0, 0, translate, |
| 0, 0, scale, 0, translate, |
| 0, 0, 0, 1, 0 }); |
| } |
| |
| private static void setContrastTranslateOnly(ColorMatrix cm, float contrast) { |
| float scale = contrast + 1.f; |
| float translate = (-.5f * scale + .5f) * 255.f; |
| cm.set(new float[] { |
| 1, 0, 0, 0, translate, |
| 0, 1, 0, 0, translate, |
| 0, 0, 1, 0, translate, |
| 0, 0, 0, 1, 0 }); |
| } |
| |
| private static void setContrastScaleOnly(ColorMatrix cm, float contrast) { |
| float scale = contrast + 1.f; |
| float translate = (-.5f * scale + .5f) * 255.f; |
| cm.set(new float[] { |
| scale, 0, 0, 0, 0, |
| 0, scale, 0, 0, 0, |
| 0, 0, scale, 0, 0, |
| 0, 0, 0, 1, 0 }); |
| } |
| |
| @Override protected void onDraw(Canvas canvas) { |
| Paint paint = mPaint; |
| float x = 20; |
| float y = 20; |
| |
| canvas.drawColor(Color.WHITE); |
| |
| paint.setColorFilter(null); |
| canvas.drawBitmap(mBitmap, x, y, paint); |
| |
| ColorMatrix cm = new ColorMatrix(); |
| |
| mAngle += 2; |
| if (mAngle > 180) { |
| mAngle = 0; |
| } |
| |
| //convert our animated angle [-180...180] to a contrast value of [-1..1] |
| float contrast = mAngle / 180.f; |
| |
| setContrast(cm, contrast); |
| paint.setColorFilter(new ColorMatrixColorFilter(cm)); |
| canvas.drawBitmap(mBitmap, x + mBitmap.getWidth() + 10, y, paint); |
| |
| setContrastScaleOnly(cm, contrast); |
| paint.setColorFilter(new ColorMatrixColorFilter(cm)); |
| canvas.drawBitmap(mBitmap, x, y + mBitmap.getHeight() + 10, paint); |
| |
| setContrastTranslateOnly(cm, contrast); |
| paint.setColorFilter(new ColorMatrixColorFilter(cm)); |
| canvas.drawBitmap(mBitmap, x, y + 2*(mBitmap.getHeight() + 10), |
| paint); |
| |
| invalidate(); |
| } |
| } |
| } |
| |