Mathematica: draw a double integral

[matinking]

I've written a MATLAB m-file to draw a double integral as below.My problem is how to draw a double integral when the variables are located in the bounds of the integral not under its operator!
m-file:
tetha = pi/4;
lamb = -1;
h = 4;
tetha0 = 0;
syms x y l

n = [h.*((cos(tetha)).^2)./sin(tetha); h.*abs(cos(tetha)); 0];
ft = ((tetha - pi/2)./sin(tetha)).^4;
Rt = [cos(tetha) -sin(tetha); sin(tetha) cos(tetha)];
zt = [cos(tetha0) -sin(tetha0); sin(tetha0) cos(tetha0)];
lt = [x;y];

integrand = @(x,y)(ft.*h.*((abs(cos(tetha)).* (x.*cos(tetha)-y.*sin(tetha)))-((cos(tetha)).^2/sin(tetha)).*(x.*sin(tetha)+y.*cos(tetha))));
PhiHat = @(a,b)(dblquad(integrand,0,a,0,b));
ezsurfc(PhiHat,[0,5,0,5])

 

[Vailanor]

hold onplot3(lt(1),lt(2),lamb.*h.*(abs(cos(tetha))-((cos(tetha)).^2/sin(tetha))),'o','MarkerSize',5,'MarkerFaceColor','k')set(gca,'xlim',[0 5],'ylim',[0 5])</code>The desired integral is as below:∫∫_Ω Φhat (x, y) dAwhere: Ω = {(x, y): 0 ≤ x ≤ h cos(θ)/sin(θ), 0 ≤ y ≤ |h cos(θ)|,Φhat(x, y) = (θ − pi/2)/sin(θ)^4 * h * [|h cos(θ)|x cos(θ) − y sin(θ) − (cos(θ)^2 / sin(θ)) (x sin(θ) + y cos(θ))]Thanks.