my tower isn't turning as the balloon goes by.

chrisah

//my balloons and towers are (40, 40)

void drawTower() {

    for (int i=w.balloonList.size(); i == -1; i--) {
      Balloon balloon = w.balloonList.get(i);

      if (dist(pos.x+20, pos.y+20, balloon.pos.x + 20, balloon.pos.y + 20) < radius) {
        bPosX = balloon.pos.x;
        bPosY = balloon.pos.y;
      }
    }
    float angle = atan2(bPosY - (pos.y+20), bPosX - (pos.x+20)) + HALF_PI;

    pushMatrix();
    translate(pos.x + 20, pos.y + 20);//origin
    rotate(angle);
    image(monkey, -20, -20);
    popMatrix();

    if (mouseX > pos.x && mouseX < pos.x+40
      && mouseY > pos.y && mouseY < pos.y+40) {
      noStroke();
      fill(0, 0, 155, 60);//sets a blue colour slightly visible
      ellipse(pos.x+20, pos.y+20, radius*2-40, radius*2-40);//outer ring of radius around the tower
    }
}

Chrisir

this is too briefly written

what is pos.x ?

why do you have monkey in line 14 ? Is that the tower?

Chrisir

Balloon balloon = new Balloon();
PVector pos=new PVector(222, 300); // tower / monkey 

int radius = 200;

float bPosX;
float bPosY;

void setup () {
  size(600, 600);
  background(0);
}

void draw() {
  background(0);
  drawTower();
  balloon.pos.x+=balloon.speed.x;
  balloon.display();
}

void drawTower() {

  //   = w.balloonList.get(i);

  // if (dist(pos.x+20, pos.y+20, balloon.pos.x + 20, balloon.pos.y + 20) < radius) {
  bPosX = balloon.pos.x;
  bPosY = balloon.pos.y;
  // }
  // } // for 
  float angle = atan2(bPosY - (pos.y+20), bPosX - (pos.x+20)) + HALF_PI;

  pushMatrix();
  translate(pos.x + 20, pos.y + 20);//origin
  rotate(angle);
  text("monkey", -20, -20);
  popMatrix();

  if (mouseX > pos.x && mouseX < pos.x+40
    && mouseY > pos.y && mouseY < pos.y+40) {
    noStroke();
    fill(0, 0, 155, 60);//sets a blue colour slightly visible
    ellipse(pos.x+20, pos.y+20, radius*2-40, radius*2-40);//outer ring of radius around the tower
  }
}

// ==================================

class Balloon {

  PVector pos=new PVector(0, 40);
  PVector speed=new PVector(3, 0);

  void display() {
    ellipse(pos.x, pos.y, 6, 6);
  }
  //
} // class 
//

chrisah

did you change the angle or rotation info or did t just work?

Chrisir

the if clause and the for loop are ending in line 9/10 in your code (the very first post)

thus only the last ball that is close enough (the dist() thing) can turn the tower

so I took out the dist() and the for-loop (so maybe you need to fix that part)

I haven't changed the rotation itself (the block between pushMatrix and popMatrix)

;-)