void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
    float zoom = 0.5;
	vec2 uv = zoom * (fragCoord.xy - iResolution.xy / 2.0);
        
    float t = iTime * 3.1415;
    
    float x = uv.x;
    float y = uv.y;
    
    
    float pi = acos(-1.);
        
   
    float m = 1.;
    float n = 8.;
    float p = 1.;
    
    float r = sqrt(x*x+y*y);
    float th = atan(y, x);
   
    
    float value = 0.;
    
    const int points = 7;
    
    for(int i = 0; i < points ; i++){
      float angle = pi / float(points) * float(i);

      float w = x * sin(angle) + y * cos(angle);

	  value += sin(w + t);
    };

        
    float color = (sin(value * pi / 2.) + 1.) * 1.5;
    
    if(color > 0.0) {
      fragColor = color - vec4(0,1.5,2,0); 
    } else {
      //fragColor = vec4(med, med, low,1.0);
      fragColor = -color - vec4(1,1.5,0,0); 
    }
}