PathDashPathEffect example

android.graphics.PathDashPathEffect dash the drawn path by stamping it with the specified shape.

Example:

PathDashPathEffect example

Modify MyView.java from the post.

package com.example.androidview;

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

public class MyView extends View {

 Paint paint;
 Path path;

 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.RED);
  paint.setStrokeWidth(20);
  paint.setStyle(Paint.Style.STROKE);

  path = new Path();
  
  Path pathShape = new Path();
  pathShape.addCircle(10, 10, 10, Direction.CCW);
  
  float advance = 30.0f;
  float phase = 20.0f;
  PathDashPathEffect.Style style = PathDashPathEffect.Style.ROTATE;
  
  PathDashPathEffect pathDashPathEffect =
   new PathDashPathEffect(pathShape, advance, phase, style);
  
  paint.setPathEffect(pathDashPathEffect);

 }

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

  path.reset();
  path.moveTo(50,  50);
  path.lineTo(50, getHeight()-50);
  path.lineTo(getWidth()-50, getHeight()-50);
  path.lineTo(getWidth()-50, 50);
  path.close();
  
  canvas.drawPath(path, paint);
 }

}

ComposePathEffect example

android.graphics.ComposePathEffect create PathEffect from other two PathEffects, to apply first the inner effect and the outer pathEffect.

Here is a example to create ComposePathEffect from CornerPathEffect and DashPathEffect, in various combination.

Where:

• paint0: no effect
• paint1: CornerPathEffect
• paint2: DashPathEffect
• paint3: ComposePathEffect(cornerPathEffect, dashPathEffect)
• paint4: ComposePathEffect(dashPathEffect, cornerPathEffect)
• paint5: ComposePathEffect(cornerPathEffect, cornerPathEffect)
• ComposePathEffect(another dashPathEffect, dashPathEffect)

Modify MyView.java from the post.

package com.example.androidview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ComposePathEffect;
import android.graphics.CornerPathEffect;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.View;

public class MyView extends View {

 Paint paint0, paint1, paint2, paint3, paint4, paint5, paint6;
 Path path;

 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() {
  paint0 = new Paint();
  paint0.setColor(Color.BLACK);
  paint0.setStrokeWidth(10);
  paint0.setStyle(Paint.Style.STROKE);
  
  paint1 = new Paint();
  paint1.set(paint0);
  paint1.setColor(Color.RED);
  
  paint2 = new Paint();
  paint2.set(paint0);
  paint2.setColor(Color.GREEN);
  
  paint3 = new Paint();
  paint3.set(paint0);
  paint3.setColor(Color.BLUE);
  
  paint4 = new Paint();
  paint4.set(paint0);
  paint4.setColor(Color.CYAN);
  
  paint5 = new Paint();
  paint5.set(paint0);
  paint5.setColor(Color.MAGENTA);
  
  paint6 = new Paint();
  paint6.set(paint0);
  paint6.setColor(Color.GRAY);

  path = new Path();
  path.moveTo(20, 20);
  path.lineTo(20, 60);
  path.lineTo(100, 80);
  path.lineTo(10, 150);
  path.lineTo(20, 200);
  path.lineTo(20, 500);
  path.lineTo(100, 500);
  path.lineTo(100, 300);
  path.lineTo(150, 300);

  float radius = 50.0f;
  CornerPathEffect cornerPathEffect = 
   new CornerPathEffect(radius);
  
  float[] intervals = new float[]{80.0f, 30.0f};
  float phase = 0;
  DashPathEffect dashPathEffect = 
   new DashPathEffect(intervals, phase);

  ComposePathEffect composePathEffect3 = 
   new ComposePathEffect(cornerPathEffect, dashPathEffect);
  ComposePathEffect composePathEffect4 = 
    new ComposePathEffect(dashPathEffect, cornerPathEffect);
  ComposePathEffect composePathEffect5 = 
    new ComposePathEffect(cornerPathEffect, cornerPathEffect);
  
  float[] intervals6 = new float[]{5.0f, 5.0f};
  float phase6 = 0;
  DashPathEffect dashPathEffect6 = 
    new DashPathEffect(intervals6, phase6);
  ComposePathEffect composePathEffect6 = 
    new ComposePathEffect(dashPathEffect6, dashPathEffect);

  paint1.setPathEffect(cornerPathEffect);
  paint2.setPathEffect(dashPathEffect);
  paint3.setPathEffect(composePathEffect3);
  paint4.setPathEffect(composePathEffect4);
  paint5.setPathEffect(composePathEffect5);
  paint6.setPathEffect(composePathEffect6);

 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  canvas.drawPath(path, paint0); //no effect
  canvas.translate(150, 0);
  canvas.drawPath(path, paint1);
  canvas.translate(150, 0);
  canvas.drawPath(path, paint2);
  canvas.translate(150, 0);
  canvas.drawPath(path, paint3);
  canvas.translate(150, 0);
  canvas.drawPath(path, paint4);
  canvas.translate(150, 0);
  canvas.drawPath(path, paint5);
  canvas.translate(150, 0);
  canvas.drawPath(path, paint6);
 }

}

Draw rounded corner line along path, with CornerPathEffect.

Example to draw rounded corner line along path, by applying CornerPathEffect on path.

Modify MyView.java from the post.

package com.example.androidview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.CornerPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.View;

public class MyView extends View {

 Paint paint;
 Path path;

 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(10);
  paint.setStyle(Paint.Style.STROKE);

  path = new Path();
  path.moveTo(50, 50);
  path.lineTo(50, 500);
  path.lineTo(200, 500);
  path.lineTo(200, 300);
  path.lineTo(350, 300);

  float radius = 50.0f;
  
  CornerPathEffect cornerPathEffect =
    new CornerPathEffect(radius);

  paint.setPathEffect(cornerPathEffect);

 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  canvas.drawPath(path, paint);

 }

}

Draw dash line along path, with DashPathEffect.

This example draw dash line along path, with DashPathEffect.

Modify MyView.java from last post.

package com.example.androidview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.View;

public class MyView extends View {

 Paint paint;
 Path path;

 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(10);
  paint.setStyle(Paint.Style.STROKE);

  path = new Path();
  path.moveTo(50, 50);
  path.lineTo(50, 500);
  path.lineTo(200, 500);
  path.lineTo(200, 300);
  path.lineTo(350, 300);
  
  float[] intervals = new float[]{50.0f, 20.0f};
  float phase = 0;
  
  DashPathEffect dashPathEffect = 
    new DashPathEffect(intervals, phase);

  paint.setPathEffect(dashPathEffect);

 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  canvas.drawPath(path, paint);

 }

}

Draw path on custom View

This example simple draw line on custom View, along path.

MyView.java, our custom View.

package com.example.androidview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.View;

public class MyView extends View {

 Paint paint;
 Path path;

 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(10);
  paint.setStyle(Paint.Style.STROKE);

  path = new Path();
  path.moveTo(50, 50);
  path.lineTo(50, 500);
  path.lineTo(200, 500);
  path.lineTo(200, 300);
  path.lineTo(350, 300);

 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  canvas.drawPath(path, paint);

 }

}

activity_main.xml, layout file with MyView.

<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" />
    <com.example.androidview.MyView
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

MainActivity.java

package com.example.androidview;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

 }

}

---

More example of drawing on path:

• Draw dash line using DashPathEffect
• Draw rounded corner line, with CornerPathEffect
• ComposePathEffect example
• PathDashPathEffect example
• Running PathDashPathEffect example
• Effect of advance, phase, style in PathDashPathEffect
• DiscretePathEffect example
• Fill path and stroke with different color
• ComposePathEffect vs SumPathEffect