week 7. using Recursion

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);
  spiral(centerX,centerY,radius,segment, recursionLevel);
}
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);
      }
    }
}

week 7. using sin(x)

sample codes:

float radius;
int segment = 10;
float centerX;
float centerY;

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);
  spiral(centerX,centerY,radius,segment);
}
void spiral(float x_c,float y_c, float r, int seg){
    for(int i =0;i<=seg;i++){
      float x = x_c+cos(i*2*PI/seg)*r;  //算出x的位置
      float y = y_c+sin(i*2*PI/seg)*r;  //算出y的位置
      point(x,y);  // 畫出點，也能用其他形狀
    }
}



EX:
1. 每次點擊滑鼠，劃一個隨機半徑大小的圓。
2. draw flower of life (生命之花)

reference:
John Whitney
https://www.youtube.com/watch?v=BzB31mD4NmA

期中作業:
動態對照的練習，共6組。
deadline Nov. 23, 2017

week 6. 3D primitives & mouse

sample codes:

size(640, 360, P3D); 
background(0);
lights();

noStroke();
pushMatrix();
translate(130, height/2, 0);
rotateY(1.25);
rotateX(-0.4);
box(100);
popMatrix();

noFill();
stroke(255);
pushMatrix();
translate(500, height*0.35, -200);
sphere(280);
popMatrix();

week 5. structure programming

Global variables v.s. local variables
subroutine calls

EX:
  use subroutine call to perform 10 x 10 element-drawing.