| /* |
| * 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 android.content.Context; |
| import android.graphics.*; |
| import android.os.Bundle; |
| import android.view.KeyEvent; |
| import android.view.View; |
| |
| public class PathEffects extends GraphicsActivity { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(new SampleView(this)); |
| } |
| |
| private static class SampleView extends View { |
| private Paint mPaint; |
| private Path mPath; |
| private PathEffect[] mEffects; |
| private int[] mColors; |
| private float mPhase; |
| |
| private static PathEffect makeDash(float phase) { |
| return new DashPathEffect(new float[] { 15, 5, 8, 5 }, phase); |
| } |
| |
| private static void makeEffects(PathEffect[] e, float phase) { |
| e[0] = null; // no effect |
| e[1] = new CornerPathEffect(10); |
| e[2] = new DashPathEffect(new float[] {10, 5, 5, 5}, phase); |
| e[3] = new PathDashPathEffect(makePathDash(), 12, phase, |
| PathDashPathEffect.Style.ROTATE); |
| e[4] = new ComposePathEffect(e[2], e[1]); |
| e[5] = new ComposePathEffect(e[3], e[1]); |
| } |
| |
| public SampleView(Context context) { |
| super(context); |
| setFocusable(true); |
| setFocusableInTouchMode(true); |
| |
| mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); |
| mPaint.setStyle(Paint.Style.STROKE); |
| mPaint.setStrokeWidth(6); |
| |
| mPath = makeFollowPath(); |
| |
| mEffects = new PathEffect[6]; |
| |
| mColors = new int[] { Color.BLACK, Color.RED, Color.BLUE, |
| Color.GREEN, Color.MAGENTA, Color.BLACK |
| }; |
| } |
| |
| @Override protected void onDraw(Canvas canvas) { |
| canvas.drawColor(Color.WHITE); |
| |
| RectF bounds = new RectF(); |
| mPath.computeBounds(bounds, false); |
| canvas.translate(10 - bounds.left, 10 - bounds.top); |
| |
| makeEffects(mEffects, mPhase); |
| mPhase += 1; |
| invalidate(); |
| |
| for (int i = 0; i < mEffects.length; i++) { |
| mPaint.setPathEffect(mEffects[i]); |
| mPaint.setColor(mColors[i]); |
| canvas.drawPath(mPath, mPaint); |
| canvas.translate(0, 28); |
| } |
| } |
| |
| @Override public boolean onKeyDown(int keyCode, KeyEvent event) { |
| switch (keyCode) { |
| case KeyEvent.KEYCODE_DPAD_CENTER: |
| mPath = makeFollowPath(); |
| return true; |
| } |
| return super.onKeyDown(keyCode, event); |
| } |
| |
| private static Path makeFollowPath() { |
| Path p = new Path(); |
| p.moveTo(0, 0); |
| for (int i = 1; i <= 15; i++) { |
| p.lineTo(i*20, (float)Math.random() * 35); |
| } |
| return p; |
| } |
| |
| private static Path makePathDash() { |
| Path p = new Path(); |
| p.moveTo(4, 0); |
| p.lineTo(0, -4); |
| p.lineTo(8, -4); |
| p.lineTo(12, 0); |
| p.lineTo(8, 4); |
| p.lineTo(0, 4); |
| return p; |
| } |
| } |
| } |
| |