//sketch_3D_Z_Bolt_B 六角ボルト
void setup()
{
  size(400, 400, P3D);
}

void draw()
{
  background(255, 255, 255);
  lights();
  ortho(-width/2, width/2, -height/2, height/2); // Same as ortho()
  translate(width / 2, height / 2);
  rotateY(map(mouseX, 0, width, -PI/1, PI/1));
  rotateX(map(mouseY, 0, height, PI/1, -PI/1));
  //noStroke();
  strokeWeight(0.1);
    
  fill(255, 255, 255);
  scale(4, 4,4);
  Bolt_B(8,24,10,30);//六角ボルト (M16x30)
}

void Bolt_B(float r,float B,float H,float L)//六角穴付きボルト
{
  pushMatrix();translate(0,0,H/2);
  Z_6Bar(B,H);popMatrix();//Z_6角支柱
  pushMatrix();translate(0,0,-L/2);
  Z_Bar(r,L);popMatrix();//Zバー
}

void Z_Bar(float r,float L)//Zバー
{
   int sides=16;//分割数
  int Sn=2;//面数
  float Pz[]={-L/2,L/2};//z座標
  float R[]={r,r};//回転物半径
  
  int i,j;
  float angleIncrement = TWO_PI/sides;
  for(j=0;j<Sn-1;j++)
  {
    float angle = 0;
    beginShape(QUAD_STRIP);
    for (i = 0; i < sides + 1; ++i)
    {
      vertex(R[j]*cos(angle), R[j]*sin(angle), Pz[j]);
      vertex(R[j+1]*cos(angle), R[j+1]*sin(angle), Pz[j+1]);
      angle += angleIncrement;
    }
    endShape(CLOSE);
  }
  pushMatrix();translate(0,0,-L/2);
  Z_Circle(r);popMatrix();//円
  pushMatrix();translate(0,0,L/2);
  Z_Circle(r);popMatrix();//円
}

void Z_Circle(float r)//円
{
  int sides=16;//分割数
  int i;
  float angleIncrement = TWO_PI/sides;
  float angle = 0;
  beginShape();
  for (i = 0; i < sides + 1; ++i)
  {
    
    vertex(r*cos(angle), r*sin(angle),0);
    vertex(r*cos(angle), r*sin(angle),0);
    angle += angleIncrement;
  }
  endShape(CLOSE);
}

void Z_6Bar(float B,float L)//Z_6角支柱
{
  int sides=6;//分割数=6
  int Sn=2;//面数
  float Pz[]={-L/2,L/2};//z座標
  float r=B/(2*cos(30*PI/180));
  float R[]={r,r};//回転物半径
  int i,j;
  float angleIncrement = TWO_PI/sides;
  for(j=0;j< Sn-1;j++)
  {
    float angle = 0;
    beginShape(QUAD_STRIP);
    for (i = 0; i <  sides + 1; ++i)
    {
      vertex(R[j]*cos(angle), R[j]*sin(angle), Pz[j]);
      vertex(R[j+1]*cos(angle), R[j+1]*sin(angle), Pz[j+1]);
      angle += angleIncrement;
    }
    endShape(CLOSE);
  }
  pushMatrix();translate(0,0,-L/2);
  Z_hexagon(B);popMatrix();//6角形
  pushMatrix();translate(0,0,L/2);
  Z_hexagon(B);popMatrix();//6角形

}


void Z_hexagon(float B)//6角形
{
  int sides=6;//分割数=6
  float r=B/(2*cos(30*PI/180));
  int i;
  float angleIncrement = TWO_PI/sides;
  float angle = 0;
  beginShape();
  for (i = 0; i <  sides + 1; ++i)
  {
    vertex(r*cos(angle), r*sin(angle),0);
    angle += angleIncrement;
  }
  endShape(CLOSE);
}