第15週

 *交PVector如何使用*

程式碼:

size(600,600);

PImage img=loadImage("img.jpg");

PVector pt=new PVector(10,20,0);

image(img,0,0);

println(pt.x);

///之前的

float userX=10,userY=20,userZ=0;

float user2X=30,user2Y=40,user2Z=0;

//現在可以以使用物件處理

PVector user=new PVector(10,20,0);

PVector user2=new PVector(30,40,0);

*做憤怒鳥，球會射出去*

程式碼:

PVector user; //(1)外面宣告,setup()及draw()都看的到

PVector Y,v=null;//彈弓,v飛行速度

void setup(){

  size(600,400);

  user = new PVector(100,300);//(2)只在setup() new一次

  Y = new PVector(100,300);

}

void draw(){

  background(255);

  line(user.x, user.y, Y.x, Y.y);

  textSize(40);

  fill(255,0,0);  text("Y", Y.x, Y.y);

  fill(255);  ellipse(user.x, user.y,20,20);//(3)用他的值

  if(v!=null) user.add(v);

}

void mouseDragged(){

  user.x=mouseX;

  user.y=mouseY;

}

void mouseReleased(){

  PVector diff = PVector.sub(Y, user);

  v = diff.div(10);

}

*控制按鈕的方向，球會跟著移動*

P語言:

import processing.serial.*;

Serial myPort;

void setup(){

  size(256,256);

  myPort = new Serial(this,"COM3",9600);

}

int ballX=0, ballY=0;

void draw(){

  if(myPort.available()>=3){

    int x = myPort.read();

    int y = myPort.read();

    int sw = myPort.read();

    ballX = x;

    ballY = y;

  }

  ellipse(ballX,ballY,10,10);

}

Arduino:

void setup() {

  pinMode(2,INPUT_PULLUP);

  Serial.begin(9600);

}

void loop() {

  int x = analogRead(A0);

  int y = analogRead(A1);

  int sw = digitalRead(2);

  Serial.write(x/4);

  Serial.write(y/4);

  Serial.write(sw);

  delay(20);

}

*清畫面版本*

程式碼:

import processing.serial.*;

Serial myPort;

void setup(){

  size(256,256);

  myPort = new Serial(this,"COM3",9600);

}

int ballX=0, ballY=0;

void draw(){

  background(255);//清畫面

  if(myPort.available()>=3){

    int x = myPort.read();

    int y = myPort.read();

    int sw = myPort.read();

    ballX = x;

    ballY = y;

  }

  ellipse(ballX,ballY,10,10);

}