matlab任意位置绘制坐标轴

有时候需要将x-y的位置绘制在屏幕中心或者其他位置,下面的代码可以实现原点移动到图中心.

% original data
year = 1981:2011;
a1 = 1.96 * ones(1,length(year));
a2 = -1.96 * ones(1,length(year));

% data
plot(year,a1,'k',year,a2,'k');

% xlimit and y limit
xlim([1981,2011]);
ylim([-3,3]);

% hold
hold on;

% get original ticks
X = get(gca,'Xtick');
Y = get(gca,'Ytick');

% get original labels
XL = get(gca,'XtickLabel');
YL = get(gca,'YtickLabel');

% new x-y limits
X_Lim = get(gca,'XLim');
Y_Lim = get(gca,'YLim');

% new position of y-axis
x_offset = diff(X_Lim)/2+X_Lim(1);

% plot new x axis
plot(X_Lim,[0 0],'k','linewidth',2);

% plot new y axis
plot([x_offset x_offset],Y_Lim,'k','linewidth',2);

% small triangles
ax = [X_Lim(end),X_Lim(end)-diff(X_Lim)/100,X_Lim(end)-diff(X_Lim)/100;0,diff(Y_Lim)/100,-diff(Y_Lim)/100];
ay = [x_offset,x_offset+diff(X_Lim)/120,x_offset-diff(X_Lim)/120;Y_Lim(end),Y_Lim(end)-diff(Y_Lim)/80,Y_Lim(end)-diff(Y_Lim)/80];
fill(ax(1,:),ax(2,:),'k');
fill(ay(1,:),ay(2,:),'k');

% get ticks offsets
Xoff = diff(X_Lim)./80+x_offset;
Yoff = diff(Y_Lim)./60;

% draw new ticks
for i=1:length(X)
plot([X(i) X(i)],[0 Yoff],'-k');
end;
for i=1:length(Y)
plot([Xoff, x_offset],[Y(i) Y(i)],'-k');
end;

% draw new tick labels
text(X-1,zeros(size(X))-2.*Yoff,XL);
text(Xoff+ones(size(Y))*0.5,Y,YL);

% hide original axis
axis off;

% set white background
set(gcf,'color','w');