Collision between Objects

HoweverIronic

I want to make my ellipse disappear when colliding with the walls of the maze (which are made up of arcs). Any tips?

Here's the code:

//Up to increase number of levels
//Down to decrease number of levels

int a=500;


void setup() {
  size(550,500);
}

int nlevels=5;
int ellipse=5;


void draw() {
  translate(0,20);
  background(255);
  noFill();



  if (nlevels<33) {
      strokeWeight(3);
    }
    else if  (nlevels<50) {
      strokeWeight(2);
    }
    else {
      strokeWeight(1);
    }
  print(nlevels);
  float dist=a/nlevels*0.8;
  //1
  line(a/2,(a/2)-dist/2,a/2,(a/2)+dist/2);
  line((a/2)-dist/2,a/2,(a/2)+dist/2,a/2);
  //2
  arc(a/2+dist/4,a/2-dist/2,dist/2,dist/2,PI,TWO_PI);
  for (int i=0;i<nlevels;i++) {
    arc(a/2-dist/2,a/2-dist/2,(dist*i),(dist*i),PI/2,PI);
    arc(a/2+dist/4,a/2-dist/2,(1.5*dist)+(dist*i),(1.5*dist)+(dist*i),PI,TWO_PI);
    arc(a/2+dist/2,a/2-dist/2,dist+(dist*i),dist+(dist*i),0,HALF_PI);
    line(a/2,(a+dist*(i-1))/2,a/2,(a+dist*i)/2);
    if (i%2==0) {
      if (i!=nlevels-1) {
        line(a/2-dist/2,a/2+(i*dist/2),a/2+dist/2,a/2+(i*dist/2));
      } else {
        line(a/2,(a+dist*i)/2,a/2+dist/2,(a+dist*i)/2);
      }
    }
  }

  fill(0);
  ellipse(mouseX,mouseY,20,20);

}

void keyPressed() {
  if (key == CODED) {
    switch (keyCode) {
      case UP:
      nlevels=min(83,nlevels+1);
      ellipse=min(83,ellipse+1);
      break;
      case DOWN:
      nlevels=max(5,nlevels-1);
      ellipse=max(5,ellipse-1);
      break;
    }
  }
}

TfGuy44

Tip #1: Edit your post.

Tip #2: Select your code.

Tip #3: Press Ctrl + o.

GoToLoop

http://www.JeffreyThompson.org/collision-detection/table_of_contents.php

HoweverIronic

I'm confused, what is it that I am supposed to follow on this guide?

erkosone

you need to vectorize your dungeon and apply physics to the walls and the character. a good start is to look at this function that determines whether there is a collision between a segment and a circle, the second step should be the resolution of the collision but to start with and have to try;)

This function only works with rectangles and circles, is the simplest way to detect collision in 2d between circle "character" with maze "walls".

/********************************************************
isCollidingCircleRectangle()

  params:
   circleX - center x coordinate for circle
   circleY - center y coordinate for circle
   radius  - radius of circle
   rectangleX - top left corner X coordinate
   rectangleY - top left corner Y coordinate
   rectangleWidth - width of rectangle
   rectangleHeight - and the height

 returns boolean - whether the two shapes are colliding

 code adapted from:
   http://stackoverflow.com/questions/401847/circle-rectangle-collision-detection-intersection
 adapted by: Jonathan Cecil
********************************************************/
final boolean isCollidingCircleRectangle(
      float circleX,
      float circleY,
      float radius,
      float rectangleX,
      float rectangleY,
      float rectangleWidth,
      float rectangleHeight)
{
    float circleDistanceX = abs(circleX - rectangleX - rectangleWidth/2);
    float circleDistanceY = abs(circleY - rectangleY - rectangleHeight/2);

    if (circleDistanceX > (rectangleWidth/2 + radius)) { return false; }
    if (circleDistanceY > (rectangleHeight/2 + radius)) { return false; }

    if (circleDistanceX <= (rectangleWidth/2)) { return true; }
    if (circleDistanceY <= (rectangleHeight/2)) { return true; }

    float cornerDistance_sq = pow(circleDistanceX - rectangleWidth/2, 2) +
                         pow(circleDistanceY - rectangleHeight/2, 2);

    return (cornerDistance_sq <= pow(radius,2));
}

Eeyorelife

I guess you could use dist()?