creating buttons for user input - Programmers Heaven

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creating buttons for user input

Posts: 3Member

Hi, My aim is to illustrate lissajous figure of CRO. The concept is to plot a locus of point whose x & y coordinate vary with time. In the code given below I have put x=sin(constant x t) , y=cos(1.5 x constant x t)

[code] Fs = 8000; % samples per second dt = 1/Fs; % seconds per sample StopTime = 6.00; % seconds t = (0:dt:StopTime-dt)'; % seconds %% Sine wave: Fc = 80; % hertz c = -pi:.04:pi; cx = sin(piFct); cy = cos(1.5piFc*t); figure('color','white'); axis on, axis equal line(cx, cy, 'color', [.4 .4 .8],'LineWidth',3); title('sine on x , cos on y ','Color',[.6 0 0]) hold on ht=plot(cx,cy,'r.','MarkerSize',20) while (1) for t = 1:length(t) x(2) = cx(t); y(2) = cy(t); set(ht,'XData',x) set(ht,'YData',y) drawnow end t = (0:dt:StopTime-dt)'; end [/code]

I have 3 questions (1)If you will run this , you will see (other than a nice double boomerang animation) a red dot at origin in graph which I want to avoid. (2)I want to create a slider button for user which replaces 1.5 in above . This way , when slider=1 you will see circle , as frequency multiplies you will see more vertically side by side loops . As frequency diminishes to fraction loop will appear horizontally stacked. (3)it would be more exciting if there is a slider for changing phase difference .Currently it is 90 degree . As it will decreases the ellipse flattens. becomes straight line for 0 degree.