week04

讓白球左右移動

int ballX=300,ballY=300;

int vx=-2;

void setup(){

  size(700,400);

}

void draw(){

  background(255);

  ellipse(ballX,ballY,30,30);

  ballX += vx;

  if(ballX<0) vx=+2;

  if(ballX>700) vx=-2;

}

碰到牆壁會反彈

int ballX=300,ballY=300;

int vx=+2,vy=-2; 

void setup(){

  size(700,400);

}

void draw(){

  background(255);

  ellipse(ballX,ballY,30,30);

  ballX += vx;

  ballY +=vy;

  if(ballX<0+15) vx=-+2;

  if(ballX>700-15) vx=-2;

  if(ballY<0+15) vy=+2;

  if(ballY>400-15) vy=-2;

}

讓球彈跳

float ballX=300,ballY=300;

float vx=+2,vy=-10; 

void setup(){

  size(700,400);

}

void draw(){

  background(255);

  ellipse(ballX,ballY,30,30);

  ballX += vx;

  ballY +=vy;

  vy+=0.98;

  if(ballX<0+15) vx=-vx;

  if(ballX>700-15) vx=-vx;

  if(ballY<0+15) vy=-vy;

  if(ballY>400-15) vy=-vy;

}

球彈到邊框會停止

float ballX=300,ballY=300;

float vx=+2,vy=-10; 

void setup(){

  size(700,400);

}

void draw(){

  background(255);

  ellipse(ballX,ballY,30,30);

  ballX += vx;

  ballY +=vy;

  if(ballX<0+15) vx=-vx*0.9;

  if(ballX>700-15) vx=-vx*0.9;

  if(ballY<0+15) vy=-vy*0.9;

  if(ballY>400-15){

    vy=-vy*0.9;

    vx=vx*0.9;

    ballY=400-15;

  }

  vy+=0.98;

}

做一個能左右上下移動的馬力歐

PImage imgmario;

float marioX=100,marioY=100;

float marioVX=0,marioVY=0;

void setup(){

  size(500,500);

  imgmario=loadImage("mario.jpg");

}

void draw(){

  background(255);  rect(0,200,500,50);

  image(imgmario,marioX,marioY,100,100);

  marioX+=marioVX;

  marioY+=marioVY;

  if(marioY<=100) marioVY+=0.9;

  else marioY=100;

}

void keyPressed(){

  if(keyCode==RIGHT) marioX+=3;

  if(keyCode==LEFT) marioX-=3;

  if(keyCode==UP){

    marioVY=-15;

  }

}

可以慢速煞車

PImage imgmario;

float marioX=100,marioY=100;

float marioVX=0,marioVY=0;

void setup(){

  size(500,500);

  imgmario=loadImage("mario.jpg");

}

void draw(){

  background(255);

  rect(0,200,500,50);

  image(imgmario,marioX,marioY,100,100);

  marioX+=marioVX;

  marioY+=marioVY;

  if(softBrake==1) marioVX *=0.9;

  if(marioY<=100) marioVY+=0.9;

  else marioY=100;

}

int softBrake=0;

void keyReleased(){

  if(keyCode==RIGHT) marioX+=3;

  if(keyCode==LEFT) marioX-=3;

}

void keyPressed(){

  if(keyCode==RIGHT){

    marioVX=3;

    softBrake=0;

  }else if(keyCode==LEFT){

    marioVX=3;

    softBrake=0;

  }else if(keyCode==UP){

    marioVY=-15;

  }

}