Rotating points around a center point

Question

Olivia Foley 2017-3-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/331380-rotating-points-around-a-center-point

编辑： Matt J 2017-3-22

Hello. I am currently writing a plugin for a custom program written by my professor. I have an image of a participant and I have a plugin already that allows me to pin point two points on their face. I can rotate the image and I want the points to rotate with the image. This is what I have:

    function varargout = rotateClockwise(plusMinus);
    %
    % By Olivia Foley
    % February 28, 2017
    WASLx = gcbf;
    UserData = WASLx.UserData;
    frame = str2num(UserData.plugin.OFP.videoFrameNumber.String);
    UserData.plugin.OFP.rotationAngle(frame) = UserData.plugin.OFP.rotationAngle(frame) + str2num(UserData.plugin.OFP.VideoRotateValue.String);
    UserData.plugin.OFP.videoImage.CData = imrotate(UserData.plugin.OFP.videoFrames{frame},UserData.plugin.OFP.rotationAngle(frame));
    % Moving the dots
    t = [UserData.plugin.OFP.transducerDot{frame}.XData, UserData.plugin.OFP.transducerDot{frame}.YData];
    n = [UserData.plugin.OFP.noseDot{frame}.XData, UserData.plugin.OFP.noseDot{frame}.YData];
    alpha = UserData.plugin.OFP.rotationAngle(frame);
    Rx = [cosd(alpha) -sind(alpha);sind(alpha) cosd(alpha)];
    centerX = (size(UserData.plugin.OFP.videoImage.CData,2))/2;
    centerY = (size(UserData.plugin.OFP.videoImage.CData,1))/2;
    % plot(centerX,centerY,'k+');
    Ry1 = [t(1)+centerX, t(2)+centerY];
    Ry2 = [n(1)+centerX, n(2)+centerY];
    % plot(t(1)+centerX, t(2)+centerY,'b*');
    % plot(n(1)+centerX, n(2)+centerY,'g*');
    Rxy1 = Ry1*Rx;
    Rxy2 = Ry2*Rx;
    % plot([Rxy1],'bo');
    % plot([Rxy2],'go');
    UserData.plugin.OFP.transducerDot{frame}.XData = Rxy1(1)-centerX;
    UserData.plugin.OFP.transducerDot{frame}.YData = Rxy1(2)-centerY;
    UserData.plugin.OFP.noseDot{frame}.XData = Rxy2(1)-centerX;
    UserData.plugin.OFP.noseDot{frame}.YData = Rxy2(2)-centerY;
    % Rotate and translate the data
    %UserData.plugin.OFP.rotationAngle(frame) = (UserData.plugin.OFP.rotationAngle(frame)-repmat(mean(UserData.plugin.OFP.rotationAngle(frame)),size(UserData.plugin.OFP.rotationAngle(frame),1),1))*Rxy + ...
    %    repmat(mean(UserData.plugin.OFP.rotationAngle(frame)),size(UserData.plugin.OFP.rotationAngle(frame),1),1) + ...
    %    ones(size(UserData.plugin.OFP.rotationAngle(frame))); %* ...
    %     diag([leftRight, ...
    %     upDown, ...
    %     frontBack]);
    % t_center = t(1);
    % n_center = n(1);
    % 
    % Rz = repmat([t_center; n_center], 1, length(t));
    % 
    % s = Ry - Rz;
    % 
    % so = Rx*s;
    % 
    % vo = so + Rz;
    % 
    % % Rxy = Rx*Ry;
    % 
    % T_rotated = vo(1,:);
    % N_rotated = vo(2,:);
    % 
    % plot(T_rotated, N_rotated,'r+');
    % linkdata off;
    % % Rotate and translate the data
    % UserData.plugin.OFP.trackingDot = (UserData.palate(n).data-repmat(mean(UserData.palate(n).data),size(UserData.palate(n).data,1),1))*Rxy + ...
    %     repmat(mean(UserData.palate(n).data),size(UserData.palate(n).data,1),1) + ...
    %     ones(size(UserData.palate(n).data)) * ...
    %     diag([leftRight, ...
    %     upDown, ...
    %     frontBack]);
    %   fcn2 = @plugins.OFP.updatePosition;
    %   addNewPositionCallback(UserData.plugin.OFP.setVideoRotationValue,fcn2); 
    % if ~strcmp(UserData.plugin.OFP.rotateClockwise.String,'Accept'),
    %     UserData.plugin.OFP.rotateClockwise.String = 'Accept';
    %     
    % %     x = mean(UserData.plugin.OFP.videoOverlay.XData);
    % %     y = mean(UserData.plugin.OFP.videoOverlay.YData);
    % %     
    % %     xlims = get(UserData.plugin.OFP.display,'XLim');
    % %     ylims = get(UserData.plugin.OFP.display,'YLim');
    % %     fcn = makeConstrainToRectFcn('impoint',[xlims(1)*1.001 xlims(2)*0.999],[ylims(1)*1.001 ylims(2)*0.999]);
    % %     UserData.plugin.OFP.impoint = impoint(UserData.plugin.OFP.display,x,y);
    % %     api = iptgetapi(UserData.plugin.OFP.impoint);
    % %     api.setDragConstraintFcn(fcn);
    % %     setColor(UserData.plugin.OFP.impoint,'k');
    %   
    %     % Start imdistline
    % else,
    %     UserData.plugin.OFP.rotateClockwise.String = 'Clockwise';
    %     delete(UserData.plugin.OFP.impoint);
    %     % Get rid of imdistline
    % end;
    WASLx.UserData = [];
    WASLx.UserData = UserData;

I'm not getting any errors, but the dots are not in the right place. I cannot figure out how to get the dots to rotate correctly--they are too low.

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Rotating points around a center point

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Rotating points around a center point

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