Collision with Abstract Entity

Garrett_T

I made an L shape, was wondering if I could some how make a collision with it. I used vertexes to make the shape for example.

beginShape();
vertex(20, 20);
vertex(100, 20);
vertex(100, 35);
vertex(35, 35);
vertex(35, 100);
vertex(20, 100);
vertex(20, 20);
endShape();

This is the method I used up above to make the L shape. Was wondering if I could make a simple collision with it, like this easy game for example.

float bullX = 20;
float bullY = 165;
float targX = 500;
float targY = 150;
float spd = 7;
color targColour;
int countX = 0;
int countY = 0;
int dirCount = 0;
int dir = 1;
void setup () {
  size (800, 400);
  targColour = color (random (100, 255), random (100, 255), random (100, 255));
}
void draw () {
  background (0);
  countX++;
  countY++;
  dirCount++;
  fill (#FF0303);
  rect (bullX, bullY, 20, 5);
  if (countY == 10) {
    countY = 0;
    targY = targY + random (5, 8) * dir;
  }
  if (dirCount > 130) {
    dir = dir * -1;
    dirCount = 0;
  }
  if (targY < 0) targY = 0;
  if (targY > height - 13) targY = height - 13;
  bullX = bullX + spd;

  if (bullX + 20  >= targX && bullX + 20 <= targX + 50 && bullY <= targY + 40 && bullY + 5 >= targY) {
    spd = 0;
    targColour = color (random (100, 255), random (100, 255), random (100, 255));
  }
  fill ( targColour);
  rect (targX, targY, 50, 40);
  if (spd == 0 || bullX > width) {
    bullX = 0;
    spd = 7;
  }
}

void keyPressed() {
  if (key == CODED) { 
    if (keyCode == UP) {
      if (bullY > 0) {
        bullY = bullY - 5;
      }
    }
    if (keyCode == DOWN) {
      if (bullY < height - 5) {
        bullY = bullY + 5;
      }
    }
  }
}

Thank you in advance for the help!

jeremydouglass

Sounds like your "abstract entity" is a polygon. You probably want to implement either polygon/point collision detection or polygon/polygon collision detection.

• http://www.jeffreythompson.org/collision-detection/poly-point.php
• http://www.jeffreythompson.org/collision-detection/poly-poly.php

Note that at a certain point if you were optimizing just for rectalinear L shapes it might be faster (better performance and simpler code) to check a) if it is in the rectangular bounding box, then b) if it is not in the cutout. If it is in the bounding box but not in the cutout, it is in the L.