matlab转c++代码实现（主要包含C++ std::vector,std::pair学习,包含数组与常数相乘，数组相加减，将数组拉成一维向量,图片的读入等内容）

MATLAB部分：
xmap = repmat( linspace( -regionW/2, regionW/2, regionW), regionH, 1 );%linspace [x1,x2,N] 等差数列 
ymap = repmat( linspace( -regionH/2, regionH/2, regionH)', 1, regionW);  %转置
%compute the angle of the vector p1-->p2
vecp1p2 = labelData(2,:) - labelData(1,:);
angle = -atan2(vecp1p2(2), vecp1p2(1)); %角度计算 四象限反正切
widthOfTheRealRegion = norm(vecp1p2) + offset; %  求p1p2点距离，开根号 +offset
midPoint = mean(labelData,1); % 取中点

xmapScaled = xmap * widthOfTheRealRegion / regionW; %对坐标进行scale
ymapScaled = ymap * 24 / regionH;%add for Alexnet  
%ymapScaled = ymap * 24 / regionH;%add for Alexnet bywxq  
xmapInImage = cos(angle) * xmapScaled + sin(angle) * ymapScaled + midPoint(1);  % 顺时针旋转
ymapInImage = -sin(angle) * xmapScaled + cos(angle) * ymapScaled + midPoint(2);
%+++MATLAB部分：
xmap = repmat( linspace( -regionW/2,