(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
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
https://www.youtube.com/watch?v=s_KIrIJkLoE
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=s_KIrIJkLoE
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