Android Open Source - InkSketch Touch Draw

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Back to project page InkSketch.

License

The source code is released under:

MIT License

Java Source Code

package com.androiddev101.inksketch;
//from  w  w w  . j  ava 2 s .  c om
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class TouchDraw extends View {
  
  static final public int PAINT_BRUSH_WIDTH_LARGE = 20; 
  static final public int PAINT_BRUSH_WIDTH_MEDIUM = 10; 
  static final public int PAINT_BRUSH_WIDTH_SMALL = 5; 
  
  Path previouslyDrawn;
  Paint brush;

  public TouchDraw(Context context, 
      AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
  }
  
  public TouchDraw(Context context, 
      AttributeSet attrs) {
    super(context, attrs);
    init();
  }
  
  public TouchDraw(Context context) {
    super(context);
    init();
  }
  
  private void init() {
    previouslyDrawn = new Path();
    brush = new Paint();
    //set paint brush details
    brush.setAntiAlias(true);
    brush.setStrokeWidth(PAINT_BRUSH_WIDTH_LARGE);
    brush.setColor(Color.BLACK);
    brush.setStyle(Paint.Style.STROKE);
    brush.setStrokeJoin(Paint.Join.ROUND);
  }
  
  @Override
  protected void onDraw(Canvas canvas) {
    canvas.drawPath(previouslyDrawn, brush);
  }
  
  @Override
  public boolean performClick() {
    return super.performClick();
  }
  
  
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    float eventX = event.getX();
    float eventY = event.getY();

    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
      previouslyDrawn.moveTo(eventX, eventY);
      invalidate();
      return true;
    case MotionEvent.ACTION_MOVE:
      previouslyDrawn.lineTo(eventX, eventY);
      previouslyDrawn.moveTo(eventX, eventY);
      invalidate();
      break;
    case MotionEvent.ACTION_UP:
      performClick();
      break;
    default:
      return false;
    }
    return false;
  }
  
  public Path getPath(){
    return previouslyDrawn;
  }
  
  public void setPreviousPath(Path previous){
    previouslyDrawn = previous;
  }
  
  public Bitmap getBitmapFromView() {
      Bitmap returnedBitmap = Bitmap.createBitmap(600, 800,Bitmap.Config.ARGB_8888);
      Canvas canvas = new Canvas(returnedBitmap);
      canvas.drawColor(Color.WHITE);
      this.draw(canvas);
      return returnedBitmap;
  }
  
  public void clear(){
    previouslyDrawn.rewind();
    invalidate();
  }
  
  public void changeStroke(int newWidth){
    brush.setStrokeWidth(newWidth);
  }
}

Java Source Code List

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