week04

1.球左右彈
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;
}

2.一直彈跳的球
float ballX=100, ballY=300;
float vx = +2, vy=-10;
void setup(){
  size(600,400);
}
void draw(){
  //background(255);
  ellipse(ballX,ballY,30,30);
  ballX += vx;
  ballY += vy;
  vy += 0.98;

  if(ballX<0+15) vx = -vx*0.9;
  if(ballX>600-15) vx = -vx*0.9;
  if(ballY<0+15) vy = -vy*0.9;
  if(ballY>400-15) vy = -vy*0.9;
}

3.不會一直彈跳的球

float ballX=100, ballY=300;

float vx = +2, vy=-10;

void setup(){

  size(600,400);

}

void draw(){

  //background(255);

  ellipse(ballX,ballY,30,30);

  ballX += vx;

  ballY += vy;

  

  if(ballX<0+15) vx = -vx*0.9;

  if(ballX>600-15) 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;

}

4.圖片跳跳跳

PImage imgMario;

float marioX=100, marioY=100;

float marioVX =0, marioVY=0;

void setup(){

  size(500,500);

  imgMario = loadImage("YYY.png");

}

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;

  }

}