week 8. rotate

float radius; int segment = 6; float centerX; float centerY;
int recursionLevel = 3;

void setup(){
size(600,600);
background(0);
stroke(255);
centerX = height/2;
centerY = width/2;
}

void draw(){
background(0);
// radius = dist(centerX, centerY, mouseX, mouseY);
radius = 50;

pushMatrix();
translate(centerX-100, centerY);
rotate(frameCount / 50.0);
spiral(0,0,radius,segment, recursionLevel);
popMatrix();

}
void spiral(float x_c,float y_c, float r, int seg,int level){
level -= 1;
noFill();
ellipse(x_c,y_c,2*r,2*r);
for(int i =0;i < seg;i++)
{
float x = x_c+cos(i*2*PI/seg)*r;
float y = y_c+sin(i*2*PI/seg)*r;
point(x,y);
ellipse(x,y,2*r,2*r);

if(level>0){
spiral(x,y,r,seg, level);
}
}
}

see example: https://processing.org/examples/regularpolygon.html

EX: 創造一個陣列，讓每個物件旋轉。