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# Colliding images change direction?

edited November 2017

I'm trying to make a program where the image changes direction when two images collide.

I want to use this code but I'm uncertain where I put it? Also what do I substitute for ob1 (object1) and x1 and where do I put the width and height variables? Thanks

`````` boolean Collision()

( ob1 - x1, ob1 -y1, ob1 - w, ob1 - h,
ob2 - x1, ob2 -y1, ob2 -w, ob2-h)

return
(ob1 - x1 < ob2 - x2 && ob1 - x2 > ob2 = x1 &&  //insert y variables

//start of code

class Bouncy
{

int x;
int y;
int dx;
int dy;

PImage nw, ne, sw, se;

Bouncy(int x, int y, int dx, int dy)
{
this.x = x;
this.y = y;
this.dx = dx;
this.dy = dy;
}

void update()
{
render();
move();
}

void render()
{
if (dx == -1 && dy == -1)
image(nw,x,y);

else if (dx == 1 && dy == -1)
image(ne,x,y);

else if (dx == -1 && dy == 1)
image(sw,x,y);

else if (dx == 1 && dy == 1)
image(se,x,y);
}

void checkCollisions()
{
int edge = 65; // half width of one of the PNG files

if (y<=(edge-edge)) // hit top border
dy=1; // switch to moving downwards

if (y>=500-(edge*2)) // hit bottom border
dy=-1; // switch to moving upwards

if (x<=edge-edge) // hit left border
dx=1; // switch to moving right

if (x>=500-(edge*2)) // hit right border
dx=-1;
}

void move()
{
checkCollisions();
x += dx;
y += dy;

}
}

Bouncy janet,jeff,jerry;

void setup()
{
size(500,500);
janet = new Bouncy(10,100,1,-1);
jeff = new Bouncy(10,150,-1,1);
jerry = new Bouncy(10,350,1,1);

}

void draw()
{
background(255);
janet.update();
jeff.update();
jerry.update();

}
``````
Tagged:

• Just edited this, if anyone could point me in the right direction?

• Check these examples:

You also need to become familiar with how the image function works: https://processing.org/reference/image_.html specifically working with 5 parameters.

Based on line 65, it seems your image files have a dimension of 65. Are they square?

Kf

• See also this general tutorial on collision detection, with many examples:

• www.jeffreythompson.org/collision-detection/table_of_contents.php