40147027S-Week10

以processing與手機互動

1. 將 processing 右上角的 java改成app mode
2. 下載 android模式

彈力球範例：

1.  void setup() {
   size(500, 500);
   }
   float ballX=250, ballY=450, ballVX=1.3, ballVY=-10;
   float ball2X=250, ball2Y=50;
   void draw() {
   if ( dist(ballX, ballY, ball2X, ball2Y)<100 ) {
   float cx=(ballX+ball2X)/2, cy=(ballY+ball2Y)/2;
   float nx=ballX-ball2X, ny=ballY-ball2Y;
   line(ballX,ballY, ball2X,ball2Y);
   PVector N=new PVector(nx, ny);
   N.normalize();
   PVector v0=new PVector(ballVX, ballVY);
   float len= -N.dot(v0);
   v0.add(N.mult(len*2));
   line(cx,cy, cx+10*ballVX, cy+10*ballVY);
   line(cx,cy, cx+20*v0.x, cy+20*v0.y);
   ellipse(cx, cy, 10, 10);
   stroke(0);
   line(ballX, ballY, ball2X, ball2Y);
   stroke(255, 128, 0);
   line(cx, cy, cx+5*ballVX, cy+5*ballVY);
   stroke(255, 128, 0);
   line(cx, cy, cx+5*v0.x, cy+5*v0.y);
   stroke(255, 0, 0);
   line(cx, cy, cx+N.x, cy+N.y);
   //return;
   ballVX=v0.x;
   ballVY=v0.y;
   }
   background(255);
   ballX+=ballVX;
   ballY+=ballVY;
   if(ballX<50 || ballX>500-50) ballVX = -ballVX;
   if(ballY<50 || ballY>500-50) ballVY = -ballVY;
   ellipse(ballX, ballY, 100, 100);
   ellipse(ball2X, ball2Y, 100, 100);
   }
   void mouseDragged(){
   ball2X=mouseX; ball2Y=mouseY;
   }
2.