graph 
      y-axis 
      |
      |
      +----> x-axis
     /
    /
    t(time axis)

basic math and  phy  
    Note:-I assume you know algebra and number theory 
    

    x^2 + y^2 = r^2         // Circle
    x^2/a^2 + y^2/a^2 = 1   // Ellipse
    x^2/b^2 + y^2/b^2 = 1   // Ellipse 

    E  = KE + PE     //energy = kinetic + potential
    v  = d/t         //velocity
    a  = v/t         //acceleration
    F  = ma 
    Fg = Gm1m2/r^2   //gravity Force
    g  = Gm/r^2       //Acceleration Due to Gravity in earth 
    F  = mg 

    //constant 
    pi 
    e   Euler's Number
    c   Speed of Light
    G   Gravitational Constant
    h   Planck's Constant
    
    
    //word 
    orbital   //path of object 
                

num suffix 
    *s              //time by second 
    *x *y *xy       //center coordinate of object 
    *r *w *h *wh    // radius width height 
    *v *vx *vy      //velocity of object
    M               //mass of objectId 
    

    1M  = earth mass 
    1s  = 1d 
    1d  = 1Au 1c    
    
    -1s  //infinite time loop 

    25@90xy!objId
        25 distance
        90 angel 
        xy num suffix

    range of num from to 
    10-->25x 5s    x from move 10x to 25x
        



var     
    graphScale
    position  
    rotate 
    
    //global var 
    let pointShape = round|square 
    let pointSize  = 
    let pointColor = #hex |colorName 

    //plot use var 
    s   
    X,Y     float value 
    x,y     int value by user define 

    //std 
    gv{}    graph var 
    t       time var 
    t=-1    infinite time until it stop it 

    //particle 
    x ,y    //position
    vx,vy   //velocity vector 
    M       //mass of particle 
    r       //radius of particle 









eq test:-
    //all use fill 
    return (X*X/0.6) + (Y*Y/0.3) < 1  //Ellipse
    return X*X + Y*Y < 0.5           //circle
    return 0.3 < X && X < 0.7 && 0.3 < Y && Y < 0.8 //rectangle 
    return x==2             //line 
    return x==2*y           //line base upon equation 
    return Y < -0.4*X*X + 0.5*X + 0 // y < ax^2 +bx+c  //parabolic trajectory 
    return  return Y*Y < 4*0.1*X    //y^2 == 4ax

    //sine wave 
        const A = 0.3;          // Amplitude (normalized)
        const B = 2 * Math.PI;  // Frequency (1 cycle over the width of the canvas)
        const C = 0;            // Horizontal shift
        const D = 0.5;          // Vertical shift normalized

        return Y < A * Math.sin(B * (X - C)) + D;




/eq/circle 
 
 
    circle (x - h)² + (y - k)² = r²
    eq:-    (x-h)^2 +(y-k)^2 = r^2
    h, k     center position of circle 
    r       radius 

    center position base 
    x*x +y*y = r*r 
/eq/Ellipse

    horizontal (x - h)²/a² + (y - k)²/b² = 1
    Vertical (x - h)²/b² + (y - k)²/a² = 1