week05 03160801

一: 會動的眼睛

眼珠會隨著箭頭移動
程式碼
void setup(){
  size(800,800);
}
void draw(){
  background(128);
  strokeWeight(20);
  ellipse(100,200,180,360);
  ellipse(300,200,180,360);

  float angle1 = atan2((mouseY-200)/2,mouseX-300);
  float newX1 = 300+100*cos(angle1)/2;
  float newY1 = 200+200*sin(angle1)/2;
  ellipse(newX1,newY1,10,10);
  float angle2 = atan2((mouseY-200)/2,mouseX-100);
  float newX2 = 100+100*cos(angle2)/2;
  float newY2 = 200+200*sin(angle2)/2;
  ellipse(newX2,newY2,10,10);
}

二: 砲塔射擊遊戲
滑鼠發射砲彈，限制10個

程式碼
void setup(){
  size(400,800);
}
float [] ballx=new float[10];
float [] bally=new float[10];
float [] ballvx=new float[10];
float [] ballvy=new float[10];
float [] angle=new float[10];
int now=0;
void draw(){
  background(0,128,0);
  fill(#F20C0C);ellipse(200,600,100,100);
  for(int i=0;i<10;i++){
    fill(#F2740C);  ellipse(ballx[i],bally[i],30,30);
    ballx[i]+=ballvx[i];  bally[i]+=ballvy[i];
  }
  angle[now]= atan2(mouseY-600,mouseX-200);

}
void mouseMoved(){
  ballx[now]=200+50*cos(angle[now]);
  bally[now]=600+50*sin(angle[now]);
}
void mousePressed(){
  ballvx[now]=cos(angle[now]);
  ballvy[now]=sin(angle[now]);
  now++;
}