add sample for using colorfilters
This commit is contained in:
Mike Reed
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/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.apis.graphics;
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import com.example.android.apis.R;
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import android.app.Activity;
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import android.content.Context;
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import android.graphics.*;
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import android.graphics.drawable.*;
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import android.os.Bundle;
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import android.view.KeyEvent;
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import android.view.*;
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public class ColorFilters extends GraphicsActivity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(new SampleView(this));
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}
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private static class SampleView extends View {
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private Activity mActivity;
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private Drawable mDrawable;
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private Drawable[] mDrawables;
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private Paint mPaint;
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private Paint mPaint2;
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private float mPaintTextOffset;
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private int[] mColors;
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private PorterDuff.Mode[] mModes;
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private int mModeIndex;
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private static void addToTheRight(Drawable curr, Drawable prev) {
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Rect r = prev.getBounds();
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int x = r.right + 12;
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int center = (r.top + r.bottom) >> 1;
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int h = curr.getIntrinsicHeight();
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int y = center - (h >> 1);
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curr.setBounds(x, y, x + curr.getIntrinsicWidth(), y + h);
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}
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public SampleView(Activity activity) {
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super(activity);
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mActivity = activity;
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Context context = activity;
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setFocusable(true);
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mDrawable = context.getResources().getDrawable(R.drawable.btn_default_normal);
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mDrawable.setBounds(0, 0, 150, 48);
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mDrawable.setDither(true);
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int[] resIDs = new int[] {
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R.drawable.btn_circle_normal,
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R.drawable.btn_check_off,
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R.drawable.btn_check_on
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};
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mDrawables = new Drawable[resIDs.length];
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Drawable prev = mDrawable;
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for (int i = 0; i < resIDs.length; i++) {
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mDrawables[i] = context.getResources().getDrawable(resIDs[i]);
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mDrawables[i].setDither(true);
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addToTheRight(mDrawables[i], prev);
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prev = mDrawables[i];
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}
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mPaint = new Paint();
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mPaint.setAntiAlias(true);
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mPaint.setTextSize(16);
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mPaint.setTextAlign(Paint.Align.CENTER);
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mPaint2 = new Paint(mPaint);
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mPaint2.setAlpha(64);
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Paint.FontMetrics fm = mPaint.getFontMetrics();
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mPaintTextOffset = (fm.descent + fm.ascent) * 0.5f;
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mColors = new int[] {
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0,
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0xCC0000FF,
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0x880000FF,
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0x440000FF,
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0xFFCCCCFF,
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0xFF8888FF,
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0xFF4444FF,
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};
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mModes = new PorterDuff.Mode[] {
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PorterDuff.Mode.SRC_ATOP,
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PorterDuff.Mode.MULTIPLY,
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};
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mModeIndex = 0;
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updateTitle();
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}
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private void swapPaintColors() {
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if (mPaint.getColor() == 0xFF000000) {
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mPaint.setColor(0xFFFFFFFF);
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mPaint2.setColor(0xFF000000);
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} else {
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mPaint.setColor(0xFF000000);
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mPaint2.setColor(0xFFFFFFFF);
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}
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mPaint2.setAlpha(64);
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}
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private void updateTitle() {
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mActivity.setTitle(mModes[mModeIndex].toString());
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}
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private void drawSample(Canvas canvas, ColorFilter filter) {
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Rect r = mDrawable.getBounds();
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float x = (r.left + r.right) * 0.5f;
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float y = (r.top + r.bottom) * 0.5f - mPaintTextOffset;
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mDrawable.setColorFilter(filter);
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mDrawable.draw(canvas);
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canvas.drawText("Label", x+1, y+1, mPaint2);
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canvas.drawText("Label", x, y, mPaint);
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for (Drawable dr : mDrawables) {
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dr.setColorFilter(filter);
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dr.draw(canvas);
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}
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}
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@Override protected void onDraw(Canvas canvas) {
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canvas.drawColor(0xFFCCCCCC);
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canvas.translate(8, 12);
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for (int color : mColors) {
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ColorFilter filter;
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if (color == 0) {
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filter = null;
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} else {
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filter = new PorterDuffColorFilter(color,
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mModes[mModeIndex]);
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}
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drawSample(canvas, filter);
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canvas.translate(0, 55);
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}
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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float x = event.getX();
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float y = event.getY();
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switch (event.getAction()) {
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case MotionEvent.ACTION_DOWN:
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break;
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case MotionEvent.ACTION_MOVE:
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break;
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case MotionEvent.ACTION_UP:
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// update mode every other time we change paint colors
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if (mPaint.getColor() == 0xFFFFFFFF) {
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mModeIndex = (mModeIndex + 1) % mModes.length;
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updateTitle();
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}
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swapPaintColors();
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invalidate();
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break;
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}
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return true;
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}
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}
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}
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