%绘制桁架函数，Scale为变形缩放系数(以下为绘制图像部分）
function RenderFrameMotion(ele,Load,Constr,xx,yy,UU,LineWidth,LineStyle,delaytime,speed)
CoordScale=[max(xx)-min(xx),max(yy)-min(yy)];
Umax=max(max((UU)));
CoordScale2=CoordScale(1)/Umax/5
k=1;
num=1;
hf=figure;
delaytime=0;
ifr=0;
for nnn=1:speed:length(UU(1,:))

    nnn;
    U=UU(:,nnn);
%计算变形后坐标
for i=1:length(xx)
   if Constr(k,1)==i & k<length(Constr(:,1))%--约束节点坐标不变
      k=k+1;
   else%--非约束节点坐标加上缩放后的位移
      x(i)=xx(i)+CoordScale2(1)*U(3*i-2,1);y(i)=yy(i)+CoordScale2(1)*U(3*i-1,1);
   end
end
%绘制杆件
for i=1:length(ele(:,1))
   plot([x(ele(i,2)),x(ele(i,3))],[y(ele(i,2)),y(ele(i,3))],...
   LineStyle,'LineWidth',LineWidth*ele(i,4)/max(ele(:,4)));
   hold on
end
%绘制节点
for i=1:length(xx)
   x1=x(i);y1=y(i);
   scatter(x1,y1,15,'k','filled') 
end

%绘制载荷
    maxLoad=abs(Load(1,2));%寻找绝对值最大的载荷
for i=1:length(Load(:,1))
    if(maxLoad<abs(Load(i,3))) 
        maxLoad=abs(Load(i,3))
    end
end
for i=1:length(Load(:,1))%绘制载荷箭头
   quiver(x(Load(i,1)),y(Load(i,1)),Load(i,2)/max(maxLoad),...
   Load(i,3)/max(maxLoad),...
   'LineWidth',1,'color','r','AutoScaleFactor',0.15*(CoordScale(1)+CoordScale(2)),...
   'MaxHeadSize',0.01*(CoordScale(1)+CoordScale(2)));
end
%绘制约束--选用结构最大的坐标尺寸作为基准来绘制约束
for i=1:length(Constr(:,1))
plot([x(Constr(i,1)) x(Constr(i,1))-0.02*max(CoordScale) x(Constr(i,1))+...
   0.02*max(CoordScale) x(Constr(i,1))],[y(Constr(i,1)) y(Constr(i,1))-...
   0.02*max(CoordScale) y(Constr(i,1))-0.02*max(CoordScale) y(Constr(i,1))],...
   'LineWidth',0.8,'color','r');
end
%绘制坐标轴
axis equal
% axis([min(x)-0.1*CoordScale(1),max(x)+0.1*CoordScale(1),min(y)-...
% 0.1*CoordScale(2),max(y)+0.1*CoordScale(2)]...
% ) %限定图像的显示范围
hold off
drawnow
ifr=ifr+1;
gifFilename='time-history.gif';
hfr=getframe(hf);
im=frame2im(hfr);
[I,map]=rgb2ind(im,256);
if ifr==1
    imwrite(I,map,gifFilename,'gif', 'DelayTime',delaytime);
else
    imwrite(I,map,gifFilename,'gif','WriteMode','append','DelayTime',delaytime);  
end
% delete(h(time_num,:))
end

% movie(m);
% v = VideoWriter('time-history.avi');
% open(v);
% writeVideo(v,m);
% close(v);
end