float pd=0;

void setup() { 
	size(500, 500);
	background(130);
	colorMode(HSB, 360, 100, 100);
	noStroke();
	smooth();
	frameRate(20);
}

void draw() {
	noStroke();
	fill(0, 0, 50, 50);
	rect(0, 0, width, height);
	float d = dist(mouseX, mouseY, pmouseX, pmouseY) ;
	fill(150 + pd, 50 + pd, 150+ pd );
	beginShape(TRIANGLE_STRIP);
 	ellipse(pmouseX+pd, pmouseY+pd, 5+pd , 5+pd);
	ellipse(pmouseX-pd, pmouseY-pd, 5+pd , 5+pd);
	ellipse(mouseX+d, mouseY+d, 5+d , 5+d);
	ellipse(mouseX-d, mouseY-d, 5+d , 5+d);
	endShape(CLOSE);
	pd = d; 
}