Thread: intersects method

ball.jpg

here is what i trying to do and having no luck with it.

1st check if ball and rectangle are touching
2nd :
if ball intersects rect from top than i want ball to go up.
if ball intersect rect from bottom than i want ball to go down.
if ball intersect rect from left than i want ball to go left.
if ball intersect rect from right than i want ball to go right.

1st part is easy. i'll i have to do is set up a getBounds() method on ball and rect. this is the red box u see on image. than test using intersects() method if two object are touching each other.

2nd part i have no idea how to do. the intersects() method doesnt tell you if ball is touching the rectangle from top,bottom,right,or left. this is the problem!

if(this.getBounds_ball().intersects(this.getBounds_box())) 
{	
	//How to test where the ball is touching the box!!!		
}

plz any ideas? every one i ask seem to explain to me how to test is two object are touching each other. BUT THIS IS NOT THE PROBLEM i already know how to do this. i need help with 2nd part. not 1st part.

any ideas? plz let me know.

ops u can igore the white line in image. i wasnt sure what i was doing there. but to find middle of shapes.

(x+width/2)

i am sure how to get started bc i do not even know what is the best approach.

i am lil confuse how will that help me to find:

if ball intersects rect from top than i want ball to go up.
if ball intersect rect from bottom than i want ball to go down.
if ball intersect rect from left than i want ball to go left.
if ball intersect rect from right than i want ball to go right.

if some one is having same problem as i do, here is a solution. i am not sure if this is the best way but it seem to be working for me. hope it helps.

if(this.getBoundsBall().intersects(this.getBoundsRect())) 
{	 
 
	if(ballY+ballHeight >= rectY && ballY <= rectY)
	{
		System.out.println("collision from top");
	}
	if(ballY <= rectY+rectHeight && ballY+ballHeight >= rectY+rHeight)
	{
		System.out.println("collision from bottom");
	}
	if(ballX+ballWidth >= rectX && ballX <= rectX)
	{
		System.out.println("collision from left");
	}
	if(ballX <= rectX+rectWidth && ballX+ballWidth >= rectX+rectWidth)
	{
		System.out.println("collision from right");
	}
}