我的“最后PVECtor”变量 正在改变每个框架,为什么?
原标题：My "final PVector" variable is changing every frame, why?
Every Frame, my particle system position changes, without me ever assigning to it.
Like so:
[50.821663, 49.430023]
[51.553301, 50.059512]
[52.480217, 47.301073]
[53.643673, 48.139871]
[55.829941, 50.354572]
[58.192818, 51.504097]
[57.826793, 52.627758]
[54.456882, 52.148365]
Anyway here s my (simplified) Particle class:
class Particle {
PVector pos = new PVector();
void Display() {
pos.add(PVector.random2D().limit(7));
}
Particle(PVector pos) {
this.pos = pos;
}
}
And the ParticleSystem:
class PartSys {
final PVector Pos = new PVector(50,50);
ArrayList
Particles = new ArrayList();
void run() {
circle(Pos.x,Pos.y,100);
for(Particle part : Particles){
part.Display();
}
}
}
ParticleSys.run(); is ran every frame.
最佳回答
My trouble came from this line: this.pos = pos; When I set the position in the constructor function, it set this.pos as a reference to our ParticleSystem position.
You see, on this line pos.add(PVector.random2D().limit(7)); (Which seemed like a perfectly reasonable thing to do)
I was indirectly (through this.pos) adding to the original ParticleSystem position.
MASSIVE thanks to @xerx593
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