mch04-14.txt

matlab 图象处理

饼图的标注

X = [19.3 22.1 51.6;
34.2 70.3 82.4;
61.4 82.9 90.8;
50.5 54.9 59.1;
29.4 36.3 47.0];

x = sum(X);
h = pie(x,explode); colormap summer    % 绘制不带分离切块的饼图，获取其句柄
textObjs = findobj(h,'Type','text');
oldStr = get(textObjs,{'String'});
val = get(textObjs,{'Extent'});
oldExt = cat(1,val{:});
Names = {'产 品 一 ：';'产 品 二 ：';'产 品 三 ：'};
newStr = strcat(Names,oldStr);
set(textObjs,{'String'},newStr)
val1 = get(textObjs, {'Extent'});
newExt = cat(1, val1{:});
offset = sign(oldExt(:,1)).*(newExt(:,3)-oldExt(:,3))/2;
pos = get(textObjs, {'Position'});
textPos = cat(1, pos{:});
textPos(:,1) = textPos(:,1)+offset;
set(textObjs,{'Position'},num2cell(textPos,[3,2]))