Effect of advance, phase, style in PathDashPathEffect

The example make PathDashPathEffect with interactive setting of advance, phase and style; such that you can know how they affect the result.


Main layout, /res/layout/activity_main.xml.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.androidview.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="android-coding.blogspot.com" />
    
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="advance"/>
    <SeekBar 
        android:id="@+id/advance"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="30"/>
    
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="phase"/>
    <SeekBar 
        android:id="@+id/phase"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="30"/>
    <Spinner
        android:id="@+id/style"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    
    <com.example.androidview.MyView
        android:id="@+id/myview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

MainActivity.java

package com.example.androidview;

import android.app.Activity;
import android.graphics.PathDashPathEffect;
import android.graphics.PathDashPathEffect.Style;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.Spinner;

public class MainActivity extends Activity {
 
 private MyView myView;
 private SeekBar seekBarAdvance, seekBarPhase;
 private Spinner spinnerStyle;
 
 private String[] styleNames ={
  "PathDashPathEffect.Style.MORPH",
  "PathDashPathEffect.Style.ROTATE",
  "PathDashPathEffect.Style.TRANSLATE"};
 private Style[] styleSettings = {
  PathDashPathEffect.Style.MORPH,
  PathDashPathEffect.Style.ROTATE,
  PathDashPathEffect.Style.TRANSLATE};
 
 private ArrayAdapter<String> spinnerStyleAdapter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  myView = (MyView)findViewById(R.id.myview);
  
  seekBarAdvance = (SeekBar)findViewById(R.id.advance);
  seekBarAdvance.setOnSeekBarChangeListener(seekBarAdvanceChangeListener);
  seekBarPhase = (SeekBar)findViewById(R.id.phase);
  seekBarPhase.setOnSeekBarChangeListener(seekBarPhaseChangeListener);
  
  spinnerStyle = (Spinner)findViewById(R.id.style);
  spinnerStyleAdapter = new ArrayAdapter<String>(this, 
   android.R.layout.simple_spinner_item, styleNames);
  spinnerStyleAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
  spinnerStyle.setAdapter(spinnerStyleAdapter);
  spinnerStyle.setOnItemSelectedListener(spinnerStyleOnItemSelectedListener);

 }
 
 OnSeekBarChangeListener seekBarAdvanceChangeListener =
  new OnSeekBarChangeListener(){

   @Override
   public void onProgressChanged(SeekBar seekBar, int progress,
     boolean fromUser) {
    myView.setAdvance(progress);
   }

   @Override
   public void onStartTrackingTouch(SeekBar seekBar) {}

   @Override
   public void onStopTrackingTouch(SeekBar seekBar) {}
  
 };
 
 OnSeekBarChangeListener seekBarPhaseChangeListener =
  new OnSeekBarChangeListener(){

   @Override
   public void onProgressChanged(SeekBar seekBar, int progress,
     boolean fromUser) {
    myView.setPhase(progress);
   }

   @Override
   public void onStartTrackingTouch(SeekBar seekBar) {}
    @Override
   public void onStopTrackingTouch(SeekBar seekBar) {}
  
 };
 
 OnItemSelectedListener spinnerStyleOnItemSelectedListener =
  new OnItemSelectedListener(){

   @Override
   public void onItemSelected(AdapterView<?> parent, View view,
     int position, long id) {
    myView.setStype(styleSettings[position]);
   }

   @Override
   public void onNothingSelected(AdapterView<?> parent) {
    // TODO Auto-generated method stub
    
   }
 };
 
}

MyView.java

package com.example.androidview;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathDashPathEffect;
import android.graphics.Path.Direction;
import android.util.AttributeSet;
import android.view.View;

public class MyView extends View {

 Paint paint;
 Path pathBorder, pathCircle;
 
 Path pathShape;
 float phase;
 float advance;
 PathDashPathEffect.Style style;

 public MyView(Context context) {
  super(context);
  init();
 }

 public MyView(Context context, AttributeSet attrs) {
  super(context, attrs);
  init();
 }

 public MyView(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
  init();
 }

 private void init() {
  paint = new Paint();
  paint.setColor(Color.BLUE);
  paint.setStrokeWidth(20);
  paint.setStyle(Paint.Style.STROKE);

  pathBorder = new Path();
  pathCircle = new Path();
  
  pathShape = new Path();
  pathShape.moveTo(0, 0);
  pathShape.lineTo(10, 20);
  pathShape.lineTo(20, 0);
  pathShape.close();
  
  phase = 30.0f;
  advance = 30.0f;
  style = PathDashPathEffect.Style.MORPH;
 }

 @SuppressLint("DrawAllocation")
 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  canvas.drawColor(Color.GRAY);

  pathBorder.reset();
  pathBorder.moveTo(50,  50);
  pathBorder.lineTo(50, getHeight()-50);
  pathBorder.lineTo(getWidth()-50, getHeight()-50);
  pathBorder.lineTo(getWidth()-50, 50);
  pathBorder.close();
  
  float radius;
  pathCircle.reset();
  if(getWidth()>getHeight()){
   radius = getHeight()/4;
  }else{
   radius = getWidth()/4;
  }
  pathCircle.addCircle(getWidth()/2, getHeight()/2, radius, Direction.CCW);

  PathDashPathEffect pathDashPathEffect =
    new PathDashPathEffect(pathShape, advance, phase, style);
  paint.setPathEffect(pathDashPathEffect);
  
  canvas.drawPath(pathCircle, paint);
  canvas.drawPath(pathBorder, paint);

 }
 
 public void setAdvance(int adv){
  advance = (float)adv;
  invalidate();
 }
 
 public void setPhase(int ph){
  phase = (float)ph;
  invalidate();
 }
 
 public void setStype(PathDashPathEffect.Style sty){
  style = sty;
  invalidate();
 }

}

- Running PathDashPathEffect example

- More examples of drawing path on custom View.