实现在Android中的手绘作物 [英] implemanting freehand crop in android

问题描述

我试图在Android使用画布实现手绘裁剪。我使用 drawPath 并将其存储在List中并在画布路径绘图中绘制OK，

>

但现在我想使用这个代码在侧面区域中的所有像素，但我不知道如何做。

  public Bitmap getBitmapWithTransparentBG（Bitmap srcBitmap）
 {
 Bitmap result = srcBitmap.copy（Bitmap.Config.ARGB_8888，true）; 
 int nWidth = result.getWidth（）; 
 int nHeight = result.getHeight（）; 
 for（int y = 0; y  {
 for（int x = 0; x< nWidth; ++ x）
 
 for（int i = 0; i< points.size（）; i ++）
 {
 
} 
 result.setPixel（x，y，Color。透明）; 
} 
} 
返回结果; 
} 
  

点是路径坐标列表listen是绘制路径的代码

  package com.org; 
 
 import java.util.ArrayList; 
 import java.util.List; 
 
 import android.content.Context; 
 import android.graphics.Bitmap; 
 import android.graphics.BitmapFactory; 
 import android.graphics.Canvas; 
 import android.graphics.Color; 
 import android.graphics.Paint; 
 import android.graphics.Paint.Style; 
 import android.graphics.Path; 
 import android.util.AttributeSet; 
 import Android.util.Log; 
 import android.view.MotionEvent; 
 import android.view.View; 
 import android.view.View.OnTouchListener; 
 
 public class SomeView extends View implements OnTouchListener {
 
 private Paint paint; 
 List< Point>点数; 
 int DIST = 2; 
 boolean flgPathDraw = true; 
 
 Bitmap bitmap = BitmapFactory.decodeResource（getResources（），R.drawable.waterlilies）; 
 
 public SomeView（Context c）{
 super（c）; 
 setFocusable（true）; 
 setFocusableInTouchMode（true）; 
 
 paint = new Paint（Paint.ANTI_ALIAS_FLAG）; 
 paint.setStyle（Paint.Style.STROKE）; 
 paint.setStrokeWidth（2）; 
 paint.setColor（Color.WHITE）; 
 
 this.setOnTouchListener（this）; 
 points = new ArrayList< Point>（）; 
} 
 public SomeView（Context context，AttributeSet attrs）{
 super（context，attrs）; 
 setFocusable（true）; 
 setFocusableInTouchMode（true）; 
 
 paint = new Paint（Paint.ANTI_ALIAS_FLAG）; 
 paint.setStyle（Paint.Style.STROKE）; 
 paint.setStrokeWidth（2）; 
 paint.setColor（Color.WHITE）; 
 
 this.setOnTouchListener（this）; 
 points = new ArrayList< Point>（）; 
 
} 
 
 public void onDraw（Canvas canvas）
 {
 canvas.drawBitmap（bitmap，0，0，null）; 
 
路径path = new Path（）; 
 boolean first = true; 
 
 for（int i = 0; i< points.size（）; i + = 2）
 {
 Point point = points.get（i）; 
 if（first）{
 first = false; 
 path.moveTo（point.x，point.y）; 
} else if（i< points.size（） -  1）{
 Point next = points.get（i + 1）; 
 path.quadTo（point.x，point.y，next.x，next.y）; 
} else {
 path.lineTo（point.x，point.y）; 
} 
} 
 canvas.drawPath（path，paint）; 
} 
 
 public boolean onTouch（View view，MotionEvent event）{
 // if（event.getAction（）！= MotionEvent.ACTION_DOWN）
 // return super.onTouchEvent（event）; 
 Point point = new Point（）; 
 point.x =（int）event.getX（）; 
 point.y =（int）event.getY（）; 
 
 if（flgPathDraw）{
 points.add（point）; 
} 
 
 invalidate（）; 
 Log.e（Hi ==>，Size：+ points.size（））; 
 
 return true; 
} 
 public void fillinPartofPath（）
 {
 Point point = new Point（）; 
 point.x = points.get（0）.x; 
 point.y = points.get（0）.y; 
 
 points.add（point）; 
 invalidate（）; 
} 
 public void resetView（）
 {
 points.clear（）; 
 paint.setColor（Color.WHITE）; 
 paint.setStyle（Style.STROKE）; 
 flgPathDraw = true; 
 invalidate（）; 
} 
} 
 
 class Point {
 public float dy; 
 public float dx; 
 float x，y; 
 
 @Override 
 public String toString（）{
 return x +，+ y; 
} 
} 
  

解决方案

Hi我想下面的链接你的确切的解决方案，你试试？

Android：图片的自由裁剪

不要忘记在这里投票和反馈。

i m trying to implement freehand crop in android using canvas. i use drawPath and store it in List and draw it in canvas path drawing ok,

like this

but now i want to make all pixel in that path in side area with this code but i dont no how to do it..

public  Bitmap getBitmapWithTransparentBG(Bitmap srcBitmap) 
    {
        Bitmap result = srcBitmap.copy(Bitmap.Config.ARGB_8888, true);
        int nWidth = result.getWidth();
        int nHeight = result.getHeight();
        for (int y = 0; y < nHeight; ++y)
        {
          for (int x = 0; x < nWidth; ++x) 
          {
             for (int i = 0; i < points.size() ; i++) 
             {

             }
              result.setPixel(x, y, Color.TRANSPARENT);
          }
        }
        return result;
    }

points is list of path coordinate hear is code for draw path

package com.org;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public class SomeView extends View implements OnTouchListener {

    private Paint paint;
    List<Point> points;
    int DIST = 2;
    boolean flgPathDraw = true;

    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.waterlilies);

    public SomeView(Context c  ) {
        super(c);
        setFocusable(true);
        setFocusableInTouchMode(true);

        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(2);
        paint.setColor(Color.WHITE);

        this.setOnTouchListener(this);
        points = new ArrayList<Point>();
    }
    public SomeView(Context context, AttributeSet attrs) {
        super(context, attrs);
        setFocusable(true);
        setFocusableInTouchMode(true);

        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(2);
        paint.setColor(Color.WHITE);

        this.setOnTouchListener(this);
        points = new ArrayList<Point>();

    }

    public void onDraw(Canvas canvas) 
    {
        canvas.drawBitmap(bitmap, 0, 0, null);

        Path path = new Path();
        boolean first = true;

        for (int i = 0; i < points.size(); i += 2) 
        {
            Point point = points.get(i);
            if (first) {
                first = false;
                path.moveTo(point.x, point.y);
            } else if (i < points.size() - 1) {
                Point next = points.get(i + 1);
                path.quadTo(point.x, point.y, next.x, next.y);
            } else {
                path.lineTo(point.x, point.y);
            }
        }
        canvas.drawPath(path, paint);
    }

    public boolean onTouch(View view, MotionEvent event) {
        // if(event.getAction() != MotionEvent.ACTION_DOWN)
        // return super.onTouchEvent(event);
        Point point = new Point();
        point.x = (int) event.getX();
        point.y = (int) event.getY();

        if (flgPathDraw) {
            points.add(point);
        }

        invalidate();
        Log.e("Hi  ==>", "Size: " + points.size());

        return true;
    }
    public void fillinPartofPath()
    {
        Point point = new Point();
        point.x = points.get(0).x;
        point.y = points.get(0).y;

        points.add(point);
        invalidate();
    }
    public void resetView()
    {
        points.clear();
        paint.setColor(Color.WHITE);
        paint.setStyle(Style.STROKE);
        flgPathDraw=true;
        invalidate();
    }
}

class Point {
    public float dy;
    public float dx;
    float x, y;

    @Override
    public String toString() {
        return x + ", " + y;
    }
}

解决方案

Hi i think below link for your exact solution, what u try?

Android: Free Croping of Image

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