x=500, y=100, width=200, height=500, pivotX=100, pivotY=400

x=450, y=150, width=100, height=400, pivotX=50, pivotY=50

var radians = (Math.PI / 180) * red.degree;
green.x += red.pivotX * Math.cos(radians) - red.pivotY * Math.sin(radians);
green.y += red.pivotX * Math.sin(radians) + red.pivotY * Math.cos(radians);

vx = green.x + green.pivotX - red.x - red.pivotX;
vy = green.y + green.pivotY - red.y - red.pivotY;

wx = Math.cos(radians)*vx - Math.sin(radians)*vy;
wy = Math.sin(radians)*vx + Math.cos(radians)*vy;

green.x += wx - vx;
green.y += wy - vy;