比奇堡佳齁勝 05

void setup() {

  size(400, 600);

}

float x=200, y=300;

void draw() {

  background(255);

  stroke(0);

  line(200, 100, x, y);

  ellipse(x, y, 30, 30);

  stroke(255, 0, 0);//紅色往下的線

  line(x, y, x, y+100);

  PVector d=new PVector(x-200, y-100).normalize();//

  PVector d2=new PVector(0, 1);

  float g = PVector.dot(d, d2);

  d.mult(100*g);

  stroke(0, 255, 0);

  line(x, y, x+d.x, y+d.y);

}

void mouseDragged() {

  x=mouseX;

  y=mouseY;

}

void setup(){

  size(400,600);

  c = new PVector(200,100);//new出新物件

  p = new PVector(200,130);//new出新物件

}

PVector c,p;

void draw(){

  background(255);

  ellipse(c.x,c.y,10,10);//使用物件c,x

  ellipse(p.x,p.y,10,10);

}

void setup() {

  size(400, 600);

}

float x=200, y=300;

void draw() {

  background(255);

  stroke(0);

  line(200, 100, x, y);

  ellipse(x, y, 30, 30);

  stroke(255, 0, 0);//紅色往下的線

  line(x, y, x, y+100);

  PVector d=new PVector(x-200, y-100).normalize();//

  PVector d2=new PVector(0, 1);

  float g = PVector.dot(d, d2);

  d.mult(100*g);

  stroke(0, 255, 0);

  line(x, y, x+d.x, y+d.y);

  

  PVector N = new PVector(d.y,d.x).normalize();//長度1

  N.mult(100*sin(acos(g))); //g是cos(a),acos(g)就是角度

  stroke(0,0,255);//藍色線往右下

  line(x, y, x+N.x, y+N.y);

  

}

void mouseDragged() {

  x=mouseX;

  y=mouseY;

}

void setup() {

  size(400, 600);

}

float x=200, y=300;

void draw() {

  background(255);

  stroke(0);

  line(200, 100, x, y);

  ellipse(x, y, 30, 30);

  stroke(255, 0, 0);//紅色往下的線

  line(x, y, x, y+100);

  PVector d=new PVector(x-200, y-100).normalize();//

  PVector d2=new PVector(0, 1);

  float g = PVector.dot(d, d2);

  d.mult(100*g);

  stroke(0, 255, 0);

  line(x, y, x+d.x, y+d.y);

  PVector N =PVector.sub(d2.mult(100),d);//PVector N = new PVector(d.y, d.x).normalize();//長度1

  //N.mult(100*sin(acos(g))); //g是cos(a),acos(g)就是角度

  stroke(0, 0, 255);//藍色線往右下

  line(x,y,x+N.x,y+N.y);

  v.x+=N.x/1000;

  v.y+=N.y/1000;

  x+=v.x;

  y+=v.y;

 

}

PVector v = new PVector();//球的速度

void mouseDragged() {

  x=mouseX;

  y=mouseY;

}