Código Gerado:
float tg;
void setup(){
size(600,600);
}
void draw(){
background(0);
if(!(mouseX == 0)){
tg = 180+(180/PI*((atan2(300-mouseY,300-mouseX))));
}
fill(255);
ellipse(300,300,140,140); //Ellipse maior.
stroke(0);
fill(0);
ellipse(45*cos(radians(tg))+300,45*sin(radians(tg))+300,50,50);
println(tg);
}
Resultado:
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