Come rendere vista ridimensionabile sul touch evento

Question

vedere l'immagine seguente

voglio cambiare la forma di vista messo in evidenza, trascinandone l'angolo .. Non necessory la vista dopo trascinando l'angolo dovrebbe essere rettangolo può essere qualsiasi forma arbitary

come raggiungere questo ??

ora ho fatto 4 angoli mobili sul touch evento, ma la forma non cambia

package com.assignment.DragDrop; 

import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.Point; 
import android.graphics.drawable.BitmapDrawable; 
import android.graphics.drawable.Drawable; 
import android.view.MotionEvent; 
import android.view.View; 
import android.widget.ImageView; 

public class DrawView extends View { 


    Point point1,point2,point3,point4; 
    private ColorBall[] colorballs = new ColorBall[4]; // array that holds the balls 
    private int balID = 0; // variable to know what ball is being dragged 
    Paint paint; 
    Canvas canvas; 
    public DrawView(Context context) { 
     super(context); 
     paint=new Paint(); 
     setFocusable(true); //necessary for getting the touch events 
     canvas= new Canvas(); 
     // setting the start point for the balls 
     point1 = new Point(); 
     point1.x = 50; 
     point1.y = 20; 

     point2 = new Point(); 
     point2.x = 150; 
     point2.y = 20; 

     point3 = new Point(); 
     point3.x = 150; 
     point3.y = 120; 

     point4 = new Point(); 
     point4.x = 50; 
     point4.y = 120; 


     // declare each ball with the ColorBall class 
     colorballs[0] = new ColorBall(context,R.drawable.bol_blauw, point1); 
     colorballs[1] = new ColorBall(context,R.drawable.bol_blauw, point2); 
     colorballs[2] = new ColorBall(context,R.drawable.bol_groen, point3); 
     colorballs[3] = new ColorBall(context,R.drawable.bol_geel, point4); 


    } 

    // the method that draws the balls 
    @Override protected void onDraw(Canvas canvas) { 
     //canvas.drawColor(0xFFCCCCCC);  //if you want another background color  

     paint.setAntiAlias(true); 
     paint.setDither(true); 
     paint.setColor(Color.BLACK); 
     paint.setStyle(Paint.Style.FILL); 
     paint.setStrokeJoin(Paint.Join.ROUND); 
     // mPaint.setStrokeCap(Paint.Cap.ROUND); 
     paint.setStrokeWidth(5); 


      canvas.drawPaint(paint); 
      paint.setColor(Color.WHITE); 

      canvas.drawRect(point1.x+25, point2.x, point3.x+25, point4.x, paint); 
      BitmapDrawable mBitmap; 
      mBitmap= new BitmapDrawable(); 

     // canvas.drawBitmap(bitmap, left, top, paint) 
     // shade_region_between_points(); 
     // canvas.drawLine(point1.x, point1.y, point2.x, point2.y, paint); 
     // canvas.drawLine(point1.x, point1.y, point4.x, point4.y, paint); 

     // canvas.drawLine(point4.x, point4.y, point3.x, point3.y, paint); 
     // canvas.drawLine(point2.x, point2.y, point3.x, point3.y, paint); 
      //draw the balls on the canvas 
     for (ColorBall ball : colorballs) { 
      canvas.drawBitmap(ball.getBitmap(), ball.getX(), ball.getY(), paint); 
      // canvas.drawLine(point1.x, point1.y, point2.x, point2.y, paint); 

    // canvas.drawRect(point1.x, point2.x, point3.x, point4.x, paint); 



     } 
     /*Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher); 
     drawable.setBounds(point1.x+25, point2.x, point3.x+25, point4.x); 
     drawable.draw(canvas);*/ 
    } 

    // events when touching the screen 
    public boolean onTouchEvent(MotionEvent event) { 
     int eventaction = event.getAction(); 

     int X = (int)event.getX(); 
     int Y = (int)event.getY(); 

     switch (eventaction) { 

     case MotionEvent.ACTION_DOWN: // touch down so check if the finger is on a ball 
      balID = 0; 
      for (ColorBall ball : colorballs) { 
       // check if inside the bounds of the ball (circle) 
       // get the center for the ball 
       int centerX = ball.getX() + 25; 
       int centerY = ball.getY() + 25; 
       paint.setColor(Color.CYAN); 
       // calculate the radius from the touch to the center of the ball 
       double radCircle = Math.sqrt((double) (((centerX-X)*(centerX-X)) + (centerY-Y)*(centerY-Y))); 
       // canvas.drawLine(point1.x, point1.y, point2.x, point2.y, paint); 

       // if the radius is smaller then 23 (radius of a ball is 22), then it must be on the ball 
       if (radCircle < 23){ 

        balID = ball.getID(); 
        canvas.drawRect(point1.x, point2.x, point3.x, point4.x, paint); 

        invalidate(); 
        break; 
       } 
       invalidate(); 

       //canvas.drawRect(point1.x, point2.x, point3.x, point4.x, paint); 
       // check all the bounds of the ball (square) 
       //if (X > ball.getX() && X < ball.getX()+50 && Y > ball.getY() && Y < ball.getY()+50){ 
       // balID = ball.getID(); 
       // break; 
       //} 
      } 

      break; 


     case MotionEvent.ACTION_MOVE: // touch drag with the ball 
      // move the balls the same as the finger 
      if (balID > 0) { 
      try { 
       colorballs[balID-1].setX(X-25); 
        colorballs[balID-1].setY(Y-25); 
        // canvas.drawLine(point1.x, point1.y, point2.x, point2.y, paint); 

      } catch (Exception e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      paint.setColor(Color.CYAN); 
      canvas.drawRect(point1.x, point2.x, point3.x, point4.x, paint); 
      invalidate(); 
      } 

      break; 

     case MotionEvent.ACTION_UP: 
      // touch drop - just do things here after dropping 

      break; 
     } 
     // redraw the canvas 
     invalidate(); 
     return true; 

    } 


    public void shade_region_between_points() 
    { 
     canvas.drawRect(point1.x, point2.x, point3.x, point4.x, paint); 
    } 
} 

ho ottenuto questo codice da internet.

questo sarà in grado di muoversi su angoli evento di tocco ma la forma non è in movimento ...

Answer 1

Il suo proprio come quando abbiamo ritaglio immagine allora aumentare la dimensione della vostra rectangle.Then possiamo salvare la nostra vista come nuova bitmap.Puoi ricevere assistenza da this question.

Questo spiega la stessa cosa che avevi richiesto.

O

se è la layout allora si può impostare nuovo layout-param con nuova altezza e larghezza quando si tocca qualsiasi visualizzazione

Answer 2

seguito codice è disegnare rettangolo tocco base.

import java.util.ArrayList; 

import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.Point; 
import android.graphics.drawable.BitmapDrawable; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.View; 

import com.common.Utils; 
import com.example.rectangleoverlay.R; 

public class DrawView extends View { 

    Point point1, point3; 
    Point point2, point4; 

    /** 
    * point1 and point 3 are of same group and same as point 2 and point4 
    */ 
    int groupId = -1; 
    private ArrayList<ColorBall> colorballs = new ArrayList<ColorBall>(); 
    // array that holds the balls 
    private int balID = 0; 
    // variable to know what ball is being dragged 
    Paint paint; 
    Canvas canvas; 

    public DrawView(Context context) { 
     super(context); 
     paint = new Paint(); 
     setFocusable(true); // necessary for getting the touch events 
     canvas = new Canvas(); 
     // setting the start point for the balls 
     point1 = new Point(); 
     point1.x = 50; 
     point1.y = 20; 

     point2 = new Point(); 
     point2.x = 150; 
     point2.y = 20; 

     point3 = new Point(); 
     point3.x = 150; 
     point3.y = 120; 

     point4 = new Point(); 
     point4.x = 50; 
     point4.y = 120; 

     // declare each ball with the ColorBall class 
     colorballs.add(new ColorBall(context, R.drawable.gray_circle, point1)); 
     colorballs.add(new ColorBall(context, R.drawable.gray_circle, point2)); 
     colorballs.add(new ColorBall(context, R.drawable.gray_circle, point3)); 
     colorballs.add(new ColorBall(context, R.drawable.gray_circle, point4)); 

    } 

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

    public DrawView(Context context, AttributeSet attrs) { 
     super(context, attrs); 
     paint = new Paint(); 
     setFocusable(true); // necessary for getting the touch events 
     canvas = new Canvas(); 
     // setting the start point for the balls 
     point1 = new Point(); 
     point1.x = 50; 
     point1.y = 20; 

     point2 = new Point(); 
     point2.x = 150; 
     point2.y = 20; 

     point3 = new Point(); 
     point3.x = 150; 
     point3.y = 120; 

     point4 = new Point(); 
     point4.x = 50; 
     point4.y = 120; 

     // declare each ball with the ColorBall class 
     colorballs.add(new ColorBall(context, R.drawable.gray_circle, point1)); 
     colorballs.add(new ColorBall(context, R.drawable.gray_circle, point2)); 
     colorballs.add(new ColorBall(context, R.drawable.gray_circle, point3)); 
     colorballs.add(new ColorBall(context, R.drawable.gray_circle, point4)); 

    } 

    // the method that draws the balls 
    @Override 
    protected void onDraw(Canvas canvas) { 
     // canvas.drawColor(0xFFCCCCCC); //if you want another background color 

     paint.setAntiAlias(true); 
     paint.setDither(true); 
     paint.setColor(Color.parseColor("#55000000")); 
     paint.setStyle(Paint.Style.FILL); 
     paint.setStrokeJoin(Paint.Join.ROUND); 
     // mPaint.setStrokeCap(Paint.Cap.ROUND); 
     paint.setStrokeWidth(5); 

     canvas.drawPaint(paint); 
     paint.setColor(Color.parseColor("#55FFFFFF")); 

     if (groupId == 1) { 
      canvas.drawRect(point1.x + colorballs.get(0).getWidthOfBall()/2, 
        point3.y + colorballs.get(2).getWidthOfBall()/2, point3.x 
          + colorballs.get(2).getWidthOfBall()/2, point1.y 
          + colorballs.get(0).getWidthOfBall()/2, paint); 
     } else { 
      canvas.drawRect(point2.x + colorballs.get(1).getWidthOfBall()/2, 
        point4.y + colorballs.get(3).getWidthOfBall()/2, point4.x 
          + colorballs.get(3).getWidthOfBall()/2, point2.y 
          + colorballs.get(1).getWidthOfBall()/2, paint); 
     } 
     BitmapDrawable mBitmap; 
     mBitmap = new BitmapDrawable(); 

     // draw the balls on the canvas 
     for (ColorBall ball : colorballs) { 
      canvas.drawBitmap(ball.getBitmap(), ball.getX(), ball.getY(), 
        new Paint()); 

     } 
    } 

    // events when touching the screen 
    public boolean onTouchEvent(MotionEvent event) { 
     int eventaction = event.getAction(); 

     int X = (int) event.getX(); 
     int Y = (int) event.getY(); 

     switch (eventaction) { 

     case MotionEvent.ACTION_DOWN: // touch down so check if the finger is on 
             // a ball 
      balID = -1; 
      groupId = -1; 
      for (ColorBall ball : colorballs) { 
       // check if inside the bounds of the ball (circle) 
       // get the center for the ball 
       Utils.logd("Id : " + ball.getID()); 
       Utils.logd("getX : " + ball.getX() + " getY() : " + ball.getY()); 
       int centerX = ball.getX() + ball.getWidthOfBall(); 
       int centerY = ball.getY() + ball.getHeightOfBall(); 
       paint.setColor(Color.CYAN); 
       // calculate the radius from the touch to the center of the ball 
       double radCircle = Math 
         .sqrt((double) (((centerX - X) * (centerX - X)) + (centerY - Y) 
           * (centerY - Y))); 

       Utils.logd("X : " + X + " Y : " + Y + " centerX : " + centerX 
         + " CenterY : " + centerY + " radCircle : " + radCircle); 

       if (radCircle < ball.getWidthOfBall()) { 

        balID = ball.getID(); 
        Utils.logd("Selected ball : " + balID); 
        if (balID == 1 || balID == 3) { 
         groupId = 2; 
         canvas.drawRect(point1.x, point3.y, point3.x, point1.y, 
           paint); 
        } else { 
         groupId = 1; 
         canvas.drawRect(point2.x, point4.y, point4.x, point2.y, 
           paint); 
        } 
        invalidate(); 
        break; 
       } 
       invalidate(); 
      } 

      break; 

     case MotionEvent.ACTION_MOVE: // touch drag with the ball 
      // move the balls the same as the finger 
      if (balID > -1) { 
       Utils.logd("Moving Ball : " + balID); 

       colorballs.get(balID).setX(X); 
       colorballs.get(balID).setY(Y); 

       paint.setColor(Color.CYAN); 

       if (groupId == 1) { 
        colorballs.get(1).setX(colorballs.get(0).getX()); 
        colorballs.get(1).setY(colorballs.get(2).getY()); 
        colorballs.get(3).setX(colorballs.get(2).getX()); 
        colorballs.get(3).setY(colorballs.get(0).getY()); 
        canvas.drawRect(point1.x, point3.y, point3.x, point1.y, 
          paint); 
       } else { 
        colorballs.get(0).setX(colorballs.get(1).getX()); 
        colorballs.get(0).setY(colorballs.get(3).getY()); 
        colorballs.get(2).setX(colorballs.get(3).getX()); 
        colorballs.get(2).setY(colorballs.get(1).getY()); 
        canvas.drawRect(point2.x, point4.y, point4.x, point2.y, 
          paint); 
       } 

       invalidate(); 
      } 

      break; 

     case MotionEvent.ACTION_UP: 
      // touch drop - just do things here after dropping 

      break; 
     } 
     // redraw the canvas 
     invalidate(); 
     return true; 

    } 

    public void shade_region_between_points() { 
     canvas.drawRect(point1.x, point3.y, point3.x, point1.y, paint); 
    } 
} 

classe seguente viene usato per memorizzare gli oggetti

import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Point; 

public class ColorBall { 

    Bitmap bitmap; 
    Context mContext; 
    Point point; 
    int id; 
    static int count = 0; 

    public ColorBall(Context context, int resourceId, Point point) { 
     this.id = count++; 
     bitmap = BitmapFactory.decodeResource(context.getResources(), 
       resourceId); 
     mContext = context; 
     this.point = point; 
    } 

    public int getWidthOfBall() { 
     return bitmap.getWidth(); 
    } 

    public int getHeightOfBall() { 
     return bitmap.getHeight(); 
    } 

    public Bitmap getBitmap() { 
     return bitmap; 
    } 

    public int getX() { 
     return point.x; 
    } 

    public int getY() { 
     return point.y; 
    } 

    public int getID() { 
     return id; 
    } 

    public void setX(int x) { 
     point.x = x; 
    } 

    public void setY(int y) { 
     point.y = y; 
    } 
}