/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.oSKqgoNbNL6/rev.867
 * 
 * authors: 
 *   yamato misaki

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



int i=0;
int ground;
int r=10;
int d=r*2;
int x,vx;
int state=0;
//0:着地、1:空中
float y,vy; 
float g=0.2;
float tx,ty,tvx,tvy;

void setup() {  

   vx=random(1,3);
    vy=0;
    
    size(300, 300); 
    
    ground=height-50;
    
    tx=width/2;
    ty=height/2;
    tvx=tvy=0.0;
    
    x=width/2;
    y=ground-r;
    
    smooth();
    
    frameRate(30);
   
    strokeWeight(1);
}

void jump(){noStroke();
    fill(200,10,10,255);
    
    ellipse(x,y,d,d);
    if(mousePressed && state==0)
    {
        vy=-6;
        state=1;
    }
    vy+=g;
    y+=vy;
    x=mouseX;
    if(y>ground-r)
    {
        y=ground-r;
        state=0;
    }
}

void trace(){
    //相手への向きを求める
    float dx=x-tx;
    float dy=y-ty;
    //単位ベクトルを求める
    float norm=sqrt((dx*dx)+(dy*dy));
    dx/=norm;
    dy/=norm;
    //大きさを調節、速度へ
    tvx=2.0*dx;
    tvy=2.0*dy;
    //速度を座標に
    tx+=tvx;
    ty+=tvy;
    
    fill(0,100,0,255);
    ellipse(tx,ty,r,r);
}
    
void draw() { 
    background(255);
    stroke (0);
    line (0,ground,width,ground);    
    jump();
    trace();

 
}