// *********** My Object for the object library ************
// Function: Draws three flowers of different colors. 

// draw_bezier_surface() is used to create the flowers' petals.
// This function will take 8 steps and 16 Bezier points for 
// its parameters. 

// drawFlower() creates one flower and takes one parameter, which 
// is an integer to determine what color to use for the flower 
// (0 for plum, 1 for pink, and 2 for purple).

// drawThreeFlowers() then calls the drawFlower() function to 
// draw the plum, pink and purple flowers.

static GLfloat petal[16][3]={

  //the petal is drawn along the negative z-axis with the origin
  //at (0.0,0.2,0.0)

  {-0.1,0.1,-0.8}, //upper left 
  {-0.3,0.2,-0.5}, //upper middle left
  {-0.3,0.4,-0.5}, //lower middle left
  {0.1,0.2,0.0},   //lower left

  {0.0,0.1,-0.8},  //upper middle
  {0.0,0.2,-0.5},  //upper inner 
  {0.0,0.4,-0.5},  //lower inner 
  {0.0,0.2,0.0},   //lower middle

  {0.0,0.1,-0.8},  //upper middle
  {0.0,0.2,-0.5},  //upper inner
  {0.0,0.4,-0.5},  //lower inner
  {0.0,0.2,0.0},   //lower middle

  {0.1,0.1,-0.8},  //upper right
  {0.3,0.2,-0.5},  //upper middle right
  {0.3,0.4,-0.5},  //lower middle right
  {0.1,0.2,0.0}    //lower right

};

static void draw_bezier_surface(int nsteps,GLfloat*control_points){
  //glEnable(GL_AUTO_NORMAL);
  glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, control_points);
  glEnable(GL_MAP2_VERTEX_3);
  glMapGrid2f(nsteps, 0.0, 1.0, nsteps, 0.0, 1.0);
  glEvalMesh2(GL_FILL,0,nsteps,0,nsteps);
}

void jguintoDrawFlower(int color){
  
  //determines which color to use for the petals
  if (color==0){            
    twTriple plum = {221/255.0,160/255.0,221/255.0};
    twColor (plum,0.1,10);
  } else if (color==1){
    twTriple pink = {255/255.0,20/255.0,147/255.0};
    twColor (pink,0.1,10);
  }else {
    twTriple purple = {85/255.0,26/255.0,139/255.0};
    twColor (purple,0.1,10);
  }

  //draws the four petals. 
  //The petals are shifted 0.3 units up from the y-axis 
  //to take account for the stem height.
   
  glPushMatrix();            
  glTranslatef(0,0.3,0);
  draw_bezier_surface(8,petal[0]);
  glPopMatrix();

  glPushMatrix();
  glTranslatef(0,0.3,0);
  glRotatef(90,0,1,0);
  glRotatef(10,1,0,0);
  draw_bezier_surface(8,petal[0]);
  glPopMatrix();

  glPushMatrix();
  glTranslatef(0,0.3,0);
  glRotatef(180,0,1,0);
  glRotatef(5,1,0,0);
  draw_bezier_surface(8,petal[0]);
  glPopMatrix();

  glPushMatrix();
  glTranslatef(0,0.3,0);
  glRotatef(270,0,1,0);
  glRotatef(-10,1,0,0);
  draw_bezier_surface(8,petal[0]);
  glPopMatrix();


  //draws a green stem of 0.5 units
  twTriple green = {0/255.0,255/255.0,0/255.0};
  twColor (green,0.1,10);
  glBegin(GL_LINES);
  glVertex3f(0,0.5,0);
  glVertex3f(0,0,0);
  glEnd();


}

void jguintoDrawThreeFlowers(){

  //draws a pink flower
  glPushMatrix();
  glTranslatef(1,0,1);
  glRotatef(200,0,1,0);
  jguintoDrawFlower(1);
  glPopMatrix();

  //draws a purple flower
  glPushMatrix();
  glTranslatef(2,0,2);
  glRotatef(270,0,1,0);
  jguintoDrawFlower(2);
  glPopMatrix();

  //draws a plum flower
  glPushMatrix();
  glTranslatef(3,0,1);
  glRotatef(270,0,1,0);
  jguintoDrawFlower(0);
  glPopMatrix();
}