互動技術week04_ballJumpRunStop_mario

求給予方向
到邊界反彈
y方向萬有引力
x方向摩擦力

float ballX=100, ballY=300;
float vx = +8, vy = -8;

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;
}

02    瑪莉喔，跳，落下，平滑移動，柔順停止

PImage imgMario;

float marioX=100, marioY=100;

float marioVX=0, marioVY=0;

void setup(){

  size(500,500);

  imgMario = loadImage("mario.png");

}

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) softBrake=1;

  if(keyCode==LEFT) softBrake=1;

}  

void keyPressed(){

  if(keyCode==RIGHT) {

    marioVX=3;

    softBrake=0;

  }

  else if(keyCode==LEFT) {

    marioVX=-3;

    softBrake=0;

  }if(keyCode==UP) {

    marioVY = -15;

  }

}