text: /*
   * 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;
          }
      }
  }
  
  