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POCollision and deflection between two balls
 

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    <p>This is a code for the movement of two balls in a rectangle.They deflect whenever they hit the wall but don't deflect when they collide with each other .Can someone help? MovementView .java is as follows.</p> <pre><code>package com.example.movements; import android.view.SurfaceView; import android.app.LocalActivityManager; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.view.SurfaceHolder; public class MovementView extends SurfaceView implements SurfaceHolder.Callback{ private int xPos,xPos1; private int yPos,yPos1; private int xVel,xVel1; private int yVel,yVel1; private int width; private int height; private int circleRadius,circleRadius1; private Paint circlePaint,circlePaint1; UpdateThread updateThread; public MovementView(Context context) { super(context); getHolder().addCallback(this); circleRadius = 10; circlePaint = new Paint(); circlePaint.setColor(Color.BLUE); xVel = 10; yVel = 10; circleRadius1 = 10; circlePaint1 = new Paint(); circlePaint1.setColor(Color.MAGENTA); xVel1 = 11; yVel1 = 11; } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.WHITE); canvas.drawCircle(xPos, yPos, circleRadius, circlePaint); canvas.drawCircle(xPos1, yPos1, circleRadius1, circlePaint1); } public void updatePhysics() { xPos += xVel; yPos += yVel; if (yPos - circleRadius &lt; 0 || yPos + circleRadius &gt; height) { if (yPos - circleRadius &lt; 0) { yPos = circleRadius; }else{ yPos = height - circleRadius; } yVel *= -1; } if (xPos - circleRadius &lt; 0 || xPos + circleRadius &gt; width) { if (xPos - circleRadius &lt; 0) { xPos = circleRadius; } else { xPos = width - circleRadius; } xVel *= -1; } xPos1 += xVel1; yPos1 += yVel1; if (yPos1 - circleRadius1 &lt; 0 || yPos1 + circleRadius1 &gt; height) { if (yPos1 - circleRadius1 &lt; 0) { yPos1 = circleRadius1; }else{ yPos1 = height - circleRadius1; } yVel1 *= -1; } if (xPos1 - circleRadius1 &lt; 0 || xPos1 + circleRadius1 &gt; width) { if (xPos1 - circleRadius1 &lt; 0) { xPos1 = circleRadius1; } else { xPos1 = width - circleRadius1; } xVel1 *= -1; } } public void surfaceCreated(SurfaceHolder holder) { Rect surfaceFrame = holder.getSurfaceFrame(); width = surfaceFrame.width(); height = surfaceFrame.height(); xPos = width / 2; yPos = circleRadius; xPos1 = width / 2; yPos1 = circleRadius1; updateThread = new UpdateThread(this); updateThread.setRunning(true); updateThread.start(); } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } public void surfaceDestroyed(SurfaceHolder holder) { boolean retry = true; updateThread.setRunning(false); while (retry) { try { updateThread.join(); retry = false; } catch (InterruptedException e) { } } } } </code></pre>
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