# I am trying to do intersections but nothing i do will allow it to work

**URL:** <https://discourse.processing.org/t/i-am-trying-to-do-intersections-but-nothing-i-do-will-allow-it-to-work/8452>\
**Category:** Coding Questions\
**Created:** [February 16, 2019, 5:54pm UTC](https://discourse.processing.org/t/i-am-trying-to-do-intersections-but-nothing-i-do-will-allow-it-to-work/8452 "2019-02-16T17:54:28Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Supergreek72](https://avatars.discourse-cdn.com/v4/letter/s/f07891/32.png) [@Supergreek72](https://discourse.processing.org/u/Supergreek72)\
**Post date:** [February 16, 2019, 5:54pm UTC](https://discourse.processing.org/t/i-am-trying-to-do-intersections-but-nothing-i-do-will-allow-it-to-work/8452/1 "2019-02-16T17:54:28Z")

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I have 2 cars and if they touch I want it to pick a new spot, the intersection command says it only uses integers but the random command i have says it only uses floats. i fixed this by adding a rounding command but i can’t seem to get the intersection command down. i have the code here and will bold the part that is not working. I would love some help if anyone is willing.

```auto
//Feb 15th 2019
//Frogger

//images
PImage up_frog;
PImage down_frog;
PImage left_frog;
PImage right_frog;
PImage car;
PImage car2;

//movement variables
int x = 225;
int y = 650;

//car movement 
int car1X = 358;
int car2X = 0;
float car1ResetPoint;
float car2ResetPoint;

//changing direction images 
int direction = 3; // 1 = up, 2 = left, 3 = up, 4 = right

//socre 
int score = 0;

void setup() {
  //set size
  size(500, 700);
  //load images
  up_frog = loadImage("Frog.png");
  down_frog = loadImage("Frog_Down.png");
  left_frog = loadImage("Frog_Left.png");
  right_frog = loadImage("Frog_Right.png");
  car = loadImage("car.png");
  car2 = loadImage("car.png");
}

void draw() {

  //move the cars x position
  car1X = car1X + 2;
  car2X = car2X + 2;

  //make 1st grass 
  fill(0, 255, 0); //green
  rect(-1, 600, 501, 100);

  //make 2nd grass
  fill(0, 255, 0); //green
  rect(-1, 300, 501, 100);

  //make 3rd grass
  fill(0, 255, 0); //green
  rect(-1, -1, 501, 100);

  //make 1st road 
  fill(0); //black
  rect(-1, 400, 500, 200);

  //make 2nd road 
  fill(0); //black
  rect(-1, 100, 500, 200);

  //make 1st road lines
  for (int road = -1; road <= 701; road += 80) {
    fill(255, 255, 255); //white
    rect(road, 495, 40, 20);
  }

  //make 2nd road lines
  for (int road = -1; road <= 701; road += 80) {
    fill(255, 255, 255); //white
    rect(road, 190, 40, 20);
  }

  //frog directions
  if (direction == 1) {
    image(down_frog, x, y, 50, 55);
  }

  if (direction == 2) {
    image(left_frog, x, y, 50, 55);
  }

  if (direction == 3) {
    image(up_frog, x, y, 50, 55);
  }

  if (direction == 4) {
    image(right_frog, x, y, 50, 55);
  }

  //teleport car 1 back
  if (car1X >= 580) {
    car1ResetPoint = random(-400, -150);
    int round = round(car1ResetPoint);
    car1X = round;
  } 

  //move car 1
  image(car, car1X, 105, 150, 80);

  //teleport car 2 back
  if (car2X >= 580) {
    car2ResetPoint = random(-400, -150);
    int round = round(car2ResetPoint);
    car2X = round;
  }

  //teleport car2 back
  image(car2, car2X, 105, 150, 80);

  //if car spawns ontop of eachother send it back
  if (car.intersect(car2)) {
    car2ResetPoint = random(-400, car1ResetPoint - 150);
    image(car2, car2X, 105, 150, 80);
  }

  // go back from end
  if (y < 0) {
    y = 650;
    //add 1 to score 
    score = score + 1;
  }

  //down wall
  if (y > 700) {
    y = y - 60;
  }

  //left wall
  if (x < -25) {
    x = x + 60;
  }

  //right wall
  if (x > 505) {
    x = x - 60;
  }

  get(mouseX, mouseY);

  //display help button
  fill(255, 255, 255);
  //help button 
  ellipse(485, 11, 20, 20);
  //detect if mouse is in circle   
  if (mousePressed == true) {
    if (mouseX > 475 & mouseX < 500 & mouseY > 2 & mouseY < 20) {
      //display help box 
      javax.swing.JOptionPane.showMessageDialog(null, "Arrow keys to move & if you get to the end it will add 1 to your score and send you back to the start");
      //switch mouse pressed to false so it can happen again 
      mousePressed = false;
    }
  }

  //help text
  fill(0); //black
  textSize(8);
  text("Help", 476, 14);

  //display socre
  fill(0);//black
  textSize(20);
  text("Score: " + score, 10, 20);
}

void keyPressed() {
  //movement
  if (key == CODED) {
    //move up
    if (keyCode == UP) {
      y = y - 50;
      direction = 3;
    } //move down
    else if (keyCode == DOWN) {
      y = y + 50; 
      direction = 1;
    }//move left 
    else if (keyCode == LEFT) {
      x = x - 50;
      direction = 2;
    }//move right 
    else if (keyCode == RIGHT) {
      x = x + 50;
      direction = 4;
    }
  }

  //help button collision
}

```

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<div class="post-metadata">

**Author:** ![Kevin](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/kevin/32/2297_2.png) [@Kevin](https://discourse.processing.org/u/Kevin)\
**Post date:** [February 16, 2019, 6:19pm UTC](https://discourse.processing.org/t/i-am-trying-to-do-intersections-but-nothing-i-do-will-allow-it-to-work/8452/2 "2019-02-16T18:19:39Z")

</div>

Can you please edit your post to format your code?

Where are you getting the `intersect()` function? I don’t see it in the reference anywhere.

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<div class="post-metadata">

**Author:** ![Supergreek72](https://avatars.discourse-cdn.com/v4/letter/s/f07891/32.png) [@Supergreek72](https://discourse.processing.org/u/Supergreek72)\
**Post date:** [February 16, 2019, 6:36pm UTC](https://discourse.processing.org/t/i-am-trying-to-do-intersections-but-nothing-i-do-will-allow-it-to-work/8452/3 "2019-02-16T18:36:59Z")

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so is it bad i don’t understand what that means???

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<div class="post-metadata">

**Author:** ![kll](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/kll/32/964_2.png) [@kll](https://discourse.processing.org/u/kll)\
**Post date:** [February 17, 2019, 4:11am UTC](https://discourse.processing.org/t/i-am-trying-to-do-intersections-but-nothing-i-do-will-allow-it-to-work/8452/4 "2019-02-17T04:11:42Z")

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> [@Supergreek72](#):
>
> car.intersect(car2)

if you copy that code from some other project you need to copy much more…

if you write that code it means you would have created a  
class Car  
made a  
Car car,car2;  
and that class contains a method  
class Car {

boolean intersect(){}  
}

but your “car” is a PImage not a object of class Car ( what is missing)  
and that not knows that method.

if you get the idea from

> **[Trying to figure out how to intersect an image with and ellipse - Processing...](https://forum.processing.org/one/topic/trying-to-figure-out-how-to-intersect-an-image-with-and-ellipse.html)**
>
> Processing Forum

you should dig deeper…

anyhow a warning ( as it happened to me too often )  
when you search for code examples you find lots of,  
esp. in a forum,  
and it is so easy to copy and paste…  
but pls read the details first,

> do not copy code from questions  
> only from solutions!

* * *

pls go back to your above first post and repair the code posting!

in processing IDE use [ctrl][t] to format your code there  
copy and  
in forum post use the

```auto
</>

```

code formatter and paste into it.

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<div class="post-metadata">

**Author:** ![Supergreek72](https://avatars.discourse-cdn.com/v4/letter/s/f07891/32.png) [@Supergreek72](https://discourse.processing.org/u/Supergreek72)\
**Post date:** [February 18, 2019, 2:00am UTC](https://discourse.processing.org/t/i-am-trying-to-do-intersections-but-nothing-i-do-will-allow-it-to-work/8452/5 "2019-02-18T02:00:04Z")

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okay thanks. I am still really new so I don’t know these things