How to plot/draw a cross sign with 5 (x,y) coordinate,the center point change with time, with out plotting all 5 point every time

Dear User Community I would like to plot/draw a cross sign according to 5 coordinate. The situation is I want to simulate a mass ball attach with springs in 4 directions to the walls like this figure <<<http://poi.sagepub.com/content/31/1/62/F3.small.gif>>> and then simulate the ball movement with time. Now I can only draw the moving ball. If I want to draw the lines as the springs I have to redraw 5 points; 4 at walls 1 at ball, every frame of simulation. Now my code looks like this (only the graphical part)

h=plot(0,0,'MarkerSize',30,'Marker','.','LineWidth',2); w_h=4; axis([-w_h w_h -w_h w_h]); axis square; line([-4 -4],[-5 5],'Color','r','LineWidth',4);%wall line([4 4],[-5 5],'Color','r','LineWidth',4);%wall set(gca,'nextplot','replacechildren'); xlabel('X');ylabel('Y');

for i=1:length(X)-1 if (ishandle(gca)==1) Xcoord=X(1,i); Ycoord=X(2,i);

            set(h,'XData',Xcoord,'YData',Ycoord);
            drawnow;
                pause(t(i+1)-t(i));

        end
    end
Is there any way I could replace just the center coordinate and still have the lines attach to the non-replace coordinate.

Thanks,