Programming-week17

strange circle to line

pic:

program:

void setup() {

  size(300, 300);

}

float x=200, y=150;// 要動 要變數

float vx=0, vy=0;

void draw() {

  background(#002966);

  stroke(#b7efff);

  line(100, 150, x, y);

  fill(#b7efff);

  noStroke();

  ellipse(100, 150, 13, 13);

  ellipse(x, y, 13, 13);

  if (!mousePressed) {//沒又按下去...等於放開，讓他做運動

    float dx=x-100, dy=y-150;

    float len=sqrt(dx*dx+dy*dy);

    vx -= dx*(len-100)/len*0.1;//越大,越強

    vy -= dy*(len-100)/len*0.1;

    x += vx;

    y += vy;

  }

}

void mouseDragged() {

  x=mouseX; 

  y=mouseY;

  vx = 0;

  vy = 0;//拉動時,不能有速度

}

mouse control fish or cat

pic:

program:

void setup() {

  size(400, 300);

}

float x=200, y=150;// 要動 要變數

void draw() {

  background(#002966);

  fill(255);

  rect(x, y, 80, 20);//魚, 每次往你的mouse移動1/10

  float dx=x-mouseX, dy=y-mouseY;//float len=sqrt(dx*dx+dy*dy);

  x -= dx*0.1;

  y -= dy*0.1;

}