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misc PVector and example cleanup

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This commit is contained in:
Daniel Shiffman
2013-03-18 22:12:27 -04:00
parent 0c35ad10a5
commit 9a466e1866
6 changed files with 10 additions and 21 deletions
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java/examples/Topics/Simulate/Flocking/Boid.pde
+5 -8
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@@ -11,7 +11,7 @@ class Boid {
Boid(float x, float y) {
acceleration = new PVector(0,0);
velocity = new PVector(random(-1,1),random(-1,1));
velocity = PVector.random2D();
location = new PVector(x,y);
r = 2.0;
maxspeed = 2;
@@ -60,9 +60,8 @@ class Boid {
// STEER = DESIRED MINUS VELOCITY
PVector seek(PVector target) {
PVector desired = PVector.sub(target,location); // A vector pointing from the location to the target
// Normalize desired and scale to maximum speed
desired.normalize();
desired.mult(maxspeed);
// Scale to maximum speed
desired.setMag(maxspeed);
// Steering = Desired minus Velocity
PVector steer = PVector.sub(desired,velocity);
steer.limit(maxforce); // Limit to maximum steering force
@@ -120,8 +119,7 @@ class Boid {
// As long as the vector is greater than 0
if (steer.mag() > 0) {
// Implement Reynolds: Steering = Desired - Velocity
steer.normalize();
steer.mult(maxspeed);
steer.setMag(maxspeed);
steer.sub(velocity);
steer.limit(maxforce);
}
@@ -143,8 +141,7 @@ class Boid {
}
if (count > 0) {
sum.div((float)count);
sum.normalize();
sum.mult(maxspeed);
sum.setMag(maxspeed);
PVector steer = PVector.sub(sum,velocity);
steer.limit(maxforce);
return steer;