2025年11月2日星期日

week 10. using recursion for Sacred Geometry

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);
}
}
}

example 2:

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);
}
}
}

example 3:

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, 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,r*2,r*2);

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);

float r1= 2*r*map(sin(frameCount/50.0+i*PI/6.0), -1.0, 1.0, 0.01, 4.0);

ellipse(x,y,r1,r1);

if(level>0){

spiral(x,y,r,seg, level);

}

References:

The Illusions of Reality & The Basics of Sacred Geometry (The Patterns of Consciousness)

https://www.youtube.com/watch?v=zoqTNpok6zw

project 2:

draw mandala or Sacred Geometry (tree of life)

4 compositions representing earth, water, fire, wind, (4 elements)
deadline 11/28, 2025

2025年10月26日星期日

week 9. using sine

(時間往復變化)

practice:

用sine 控制一個物件之

(1) 大小 scale (https://processing.org/examples/sine.html)

(2) 位置 translation (https://processing.org/examples/sinecosine.html)

(3) 旋轉(自轉與他轉) rotation

(線性位移與 sine 曲線位移)

float x, y;

float dim = 80.0;

float dX = 4.0;

void setup() {

size(640, 360);

noStroke();

}

void draw() {

background(102);

x = x + dX;

if (x > width||x<0) {

dX = -dX;

}

pushMatrix();

translate(x, height/2-dim/2);

fill(255);

rect(-dim/2, -dim/2, dim, dim);

popMatrix();

// Transforms accumulate. Notice how this rect moves

// twice as fast as the other, but it has the same

// parameter for the x-axis value

pushMatrix();

translate(sin(map(x,0, width,0, PI))*width, height/2+dim/2);

fill(0);

rect(-dim/2, -dim/2, dim, dim);

popMatrix();

}

(scale 線性與 sine 比較)

float x, y;

float dim = 80.0;

float dX = 4.0;

void setup() {

size(640, 360);

noStroke();

frameRate(20);

}

void draw() {

background(102);

x = x + dX;

if (x > width||x<0) {

dX = -dX;

}

pushMatrix();

translate(width/4, height/2);

scale(map(x,0,width, 0.25, 4.0));

fill(255);

rect(-dim/2, -dim/2, dim, dim);

popMatrix();

// Transforms accumulate. Notice how this rect moves

// twice as fast as the other, but it has the same

// parameter for the x-axis value

pushMatrix();

translate(width*0.75, height/2);

//scale(map(x,0,width, 0.25, 4.0));

//scale(map(sin(frameCount/40.0), -1.0, 1.0, 0.25,4.0));

scale(map(sin(map(x,0,width,0.0, PI)), 0, 1.0, 0.25, 4.0));

fill(0);

rect(-dim/2, -dim/2, dim, dim);

popMatrix();

}

(空間切割) 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
}
}

( 空間切割範例)
https://processing.org/examples/star.html

using map

https://processing.org/examples/map.html

example :

void setup() {

size(800, 600);

noFill();

stroke(255, 255, 255);

}

void draw() {

float d;

background(0);

for (int i= 0; i<width; i+=50) {

pushMatrix();

translate(i, 0);

rotate(map(sin((i/40.0+frameCount)/30.0), -1.0, 1.0, -PI/4, PI/4));

line(0, 0, 0, 350);

translate(0, 350);

ellipse(0, 0, 50, 50);

popMatrix();

}

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:

https://processing.org/examples/sine.html

https://processing.org/examples/sinecosine.html

John Whitney
https://www.youtube.com/watch?v=kzniaKxMr2g

Processing Tutorial Sin & Cos

https://www.youtube.com/watch?v=ehT7d9JPulQ

2025年10月10日星期五

week 7. 3D primitives and array

Project 1 demo

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();

example2:

int gridSize = 50;
void setup(){
  size(640,360,P3D);
  
  fill(204, 204, 10);
}  
  
  
void draw() {  
  background(0);
  lights();
for (int i = 0+gridSize/2; i< width; i += gridSize)
  for (int j = 0+gridSize/2; j< height; j+= gridSize)
  {
    pushMatrix();
    translate(i, j, 0);
 //   rotateY(frameCount/5);
    rotateX(frameCount/7);
    noStroke();
    box(20);
    popMatrix();
  }
}

Example3, cube rotation + 2D array

float[][] rotateRates;


int gridSize = 50;
void setup(){
  size(640,360,P3D);
  rotateRates = new float[width][height];
  
  for (int y = 0; y < height; y++) {
    for (int x = 0; x < width; x++) {
    
      rotateRates[x][y] = random(2.0, 40.0);
    }
  }
  fill(204, 204, 10);
}  
  
  
void draw() {  
  background(0);
  lights();
for (int i = 0+gridSize/2; i< width; i += gridSize)
  for (int j = 0+gridSize/2; j< height; j+= gridSize)
  {
    pushMatrix();
    translate(i, j, 0);
 //   rotateY(frameCount/5);
 //   rotateX(frameCount/7);
    rotateX(frameCount/rotateRates[i][j]);
    noStroke();
    box(20);
    popMatrix();
  }
}

Examples 4:

float[][] rotateRates;


int gridSize = 50;
void setup(){
  size(640,360,P3D);
  rotateRates = new float[width][height];
  
  for (int y = 0; y < height; y++) {
    for (int x = 0; x < width; x++) {
    
      rotateRates[x][y] = random(5.0, 40.0);
    }
  }
  fill(204, 204, 10);
}  
  
  
void draw() {  
  background(0);
  lights();
for (int i = 0+gridSize/2; i< width; i += gridSize)
  for (int j = 0+gridSize/2; j< height; j+= gridSize)
  {
    pushMatrix();
    translate(i, j, sin(frameCount/20.0)*20.0);
 //   rotateY(frameCount/5);
 //   rotateX(frameCount/7);
    rotateX(frameCount/rotateRates[i][j]);
    noStroke();
    box(20);
    popMatrix();
  }
}

example 5: using sin

float[][] rotateRates;


int gridSize = 50;
void setup(){
  size(640,360,P3D);
  rotateRates = new float[width][height];
  
  for (int y = 0; y < height; y++) {
    for (int x = 0; x < width; x++) {
    
      rotateRates[x][y] = random(5.0, 40.0);
    }
  }
  fill(204, 204, 10);
}  
  
  
void draw() {  
  background(0);
  lights();
for (int i = 0+gridSize/2; i< width; i += gridSize)
  for (int j = 0+gridSize/2; j< height; j+= gridSize)
  {
    pushMatrix();
    translate(i, j, sin((frameCount/10.0)%width+i)*50.0);
 //   rotateY(frameCount/5);
 //   rotateX(frameCount/7);
    rotateX(frameCount/rotateRates[i][j]);
    noStroke();
    box(20);
    popMatrix();
  }
}

References:

https://processing.org/tutorials/p3d/

2025年9月28日星期日

week 5. 2D array & transform

Transform

Translate

Scale

Rotate

review:
draw a rotating shape in the center of screen.

also use 'scale()' to change the size of the object.

using pushMatrix() and popMatrix()

using cos();

參考:
https://processing.org/examples/array2d.html

用 2D array 設定每個元素的顏色，旋轉速度，屬性。

float[][] distances;
float[][] rotateAngles;
float[][] rotateRates;
float maxDistance;
int spacer;

void setup() {
size(640, 360);
maxDistance = dist(width/2, height/2, width, height);
distances = new float[width][height];
rotateAngles = new float[width][height];
rotateRates = new float[width][height];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
float distance = dist(width/2, height/2, x, y);
distances[x][y] = distance/maxDistance * 255;
rotateAngles[x][y] = random(5.0);
rotateRates[x][y] = random(5.0, 40.0);
}
}
spacer = 30;
strokeWeight(3);
//noLoop(); // Run once and stop
}

void draw() {
background(0);
// This embedded loop skips over values in the arrays based on
// the spacer variable, so there are more values in the array
// than are drawn here. Change the value of the spacer variable
// to change the density of the points
for (int y = 0; y < height; y += spacer) {
for (int x = 0; x < width; x += spacer) {
pushMatrix();
translate(x, y);
rotate(frameCount/rotateRates[x][y]+rotateAngles[x][y]);
rect(-spacer/2, -spacer/2, spacer, spacer);
stroke(distances[x][y]);
popMatrix();
}
}
}

transform example:

void setup(){

size(800, 600);

noFill();

stroke(255);

}

void draw() {

background(30);

pushMatrix();

translate(600, 400);

scale(cos(frameCount/60.0)*5.0);

rotate(frameCount/30.0);

rect(-32, -32, 64, 64);

popMatrix();

}

Practice:

Create an array of 3D shapes.

https://processing.org/tutorials/p3d/

Project 1:
1. 選定一位(或多位)美學運算的藝術家
2. 與AI 對話分析作品美學特質
3. 用 processing 編碼產生方陣重複美學的作品 (自行加入變化)，至少5件

4. 截圖以上成果，製作成 pptx

5. pptx 與原始碼，上傳到 google drive

6. 繳交日現場 demo

上傳到google drive (網址在 FB 公布)

Deadline: 10/17, 2025

2025年9月20日星期六

week 4. structural programming & basic form

Global variables v.s. local variables
subroutine calls

https://collections.vam.ac.uk/item/O154610/p-197-print-mohr-manfred/

Manfred Mohr on Openprocessing

Manfred Mohr on DADA

https://www.atariarchives.org/artist/sec15.php#google_vignette

William Kolomyjec on Openprocessing

William Kolomyjec on DADA

Computer Graphics & Art, 1977

The Recode Project (目前掛站)

all translations in Recode project (目前掛站)

Untitled 1 (see code translation & experimental)

compArt daDA: the database Digital Art

Georg Nees on Openprocessing

the

Control

Cybernetic Serendipity (1968): A Walkthrough With Jasia Reichardt

(模控巧遇)

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

1. form: point, line, polygon, arc, eclipse, rect,...
2. noLoop(); / redraw();

void setup(){
size(640, 360);
background(0);
}

int gridSize = 40;

void draw() {
background(0);
stroke(200);
noFill();
for (int x = gridSize; x <= width - gridSize; x += gridSize) {
for (int y = gridSize; y <= height - gridSize; y += gridSize) {

rotateShape(x, y);

}
}

}

void rotateShape(int xloc, int yloc) {
pushMatrix();
translate(xloc, yloc);
// rotate((frameCount / 8.0)+xloc+yloc+mouseX);
rotate((mouseX/100)*frameCount / 8.0+xloc+yloc);
rect(-10, -10, 20, 20);
line(-10, -10, 10, 10);
popMatrix();

}

References:
https://processing.org/examples/star.html

example #2:

void setup(){
size(640, 360);
background(0);
}

int gridSize = 40;

void draw() {
background(0);
stroke(200);
noFill();
for (int x = gridSize; x <= width - gridSize; x += gridSize) {
for (int y = gridSize; y <= height - gridSize; y += gridSize) {

rotateShape(x, y);

}
}

}

void rotateShape(int xloc, int yloc) {
pushMatrix();
translate(xloc, yloc);
rotate((frameCount / 8.0)+xloc+yloc);
//rotate((mouseX/100)*frameCount / 8.0+xloc+yloc);
beginShape();
vertex(-10, -10);
vertex(0, -10);
vertex(0, 0);
vertex(10, 0);
vertex(10, 10);
vertex(-10, 10);
endShape(CLOSE);
//rect(-10, -10, 20, 20);
// line(-10, -10, 10, 10);
popMatrix();

}

example #3:

int gridSize = 100;

void setup() {

size(1000, 1000);

stroke(255);

background(0);

frameRate(10);

}

void draw() {

background(0);

for (int i = 0; i <= width; i+= gridSize) {

for (int j = 0; j <= height; j+= gridSize) {

rect(i+gridSize/2 + random (40), j+gridSize/2, gridSize/4, gridSize/4);