How to make rectangle rotatable

Question

axel rose 2020-12-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/697625-how-to-make-rectangle-rotatable

回答： Anudeep Kumar 2025-6-24

function drag_drop

dragging = [];

orPos = [];

f = figure('WindowButtonUpFcn',@dropObject,'units','normalized','WindowButtonMotionFcn',@moveObject);

tmp = text(0.35,0.35,'Room','VerticalAlignment','bottom');

a = rectangle('position',[0.35, 0.35, 0.35, 0.35],'FaceColor','w','ButtonDownFcn',@dragObject,'UserData',tmp);

tmp = text(0.1,0.1,'StudyTable','VerticalAlignment','bottom');

b = rectangle('position',[0.1, 0.1, 0.1, 0.1],'FaceColor','y','ButtonDownFcn',@dragObject,'UserData',tmp);

tmp = text(0.1,0.1,'CoffeeTable','VerticalAlignment','bottom');

c = rectangle('position',[0.1, 0.1, 0.1, 0.1],'FaceColor','y','ButtonDownFcn',@dragObject,'UserData',tmp);

set(gca,'XLim',[0,1],'YLim',[0,1])

function dragObject(hObject,eventdata)

dragging = hObject;

orPos = get(gcf,'CurrentPoint');

end

function dropObject(hObject,eventdata)

if ~isempty(dragging)

newPos = get(gcf,'CurrentPoint');

posDiff = newPos - orPos;

rectpos = get(dragging,'Position') + [posDiff(1:2) 0 0];

set(dragging,'Position',rectpos);

set(dragging.UserData,'Position',rectpos(1:3));

dragging = [];

end

function moveObject(hObject,eventdata)

if ~isempty(dragging)

newPos = get(gcf,'CurrentPoint');

posDiff = newPos - orPos;

orPos = newPos;

rectpos = get(dragging,'Position') + [posDiff(1:2) 0 0];

set(dragging,'Position',rectpos);

set(dragging.UserData,'Position',rectpos(1:3));

end

I am making a drag and drop function for a floor planner. So far ive been able to drag and drop successfully (code above), but how do i make the rectangles (Studytable, coffeetable, room) to be rotatable??

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Answer 1

Anudeep Kumar 2025-6-24

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/697625-how-to-make-rectangle-rotatable#answer_1567052

在 MATLAB Online 中打开

Hey Axel,

I understand you want to rotate rectangles you plotted on your interactive figure for a floor planner you were trying to develop. As far as my knowledge 'rectangle' function does not support rotation. But the workaround is to use 'patch' or 'hgtransform'.

To achieve this using 'patches' in the following approach we can make the following changes:

Replaced 'rectangle' with 'patch'
Added rotation with 'r' key using rotation matrices

Below is the code with the changes.

function drag_drop
    dragging = [];
    orPos = [];
    selected = [];
    f = figure('WindowButtonUpFcn', @dropObject, ...
               'WindowButtonMotionFcn', @moveObject, ...
               'KeyPressFcn', @rotateObject, ...
               'units', 'normalized');
    axis([0 1 0 1]);
    axis manual;
    % Create three draggable & rotatable patches
    createObject([0.35, 0.35], [0.35, 0.35], 'Room', 'w');
    createObject([0.1, 0.1], [0.1, 0.1], 'StudyTable', 'y');
    createObject([0.25, 0.1], [0.1, 0.1], 'CoffeeTable', 'y');
    function createObject(pos, size, label, color)
        x = pos(1); y = pos(2); w = size(1); h = size(2);
        verts = [x y;
                 x+w y;
                 x+w y+h;
                 x y+h];
        p = patch('XData', verts(:,1), 'YData', verts(:,2), ...
                  'FaceColor', color, 'ButtonDownFcn', @dragObject);
        txt = text(x + w/2, y + h/2, label, ...
                   'HorizontalAlignment', 'center', ...
                   'VerticalAlignment', 'middle');
        % Store original data
        p.UserData = struct('Text', txt, ...
                            'Rotation', 0, ...
                            'Center', [x + w/2, y + h/2]);
    end
    function dragObject(hObject, ~)
        dragging = hObject;
        selected = hObject;
        orPos = get(gca, 'CurrentPoint');
    end
    function dropObject(~, ~)
        dragging = [];
    end
    function moveObject(~, ~)
        if isempty(dragging), return; end
        newPos = get(gca, 'CurrentPoint');
        diff = newPos(1,1:2) - orPos(1,1:2);
        orPos = newPos;
        % Move vertices
        x = get(dragging, 'XData') + diff(1);
        y = get(dragging, 'YData') + diff(2);
        set(dragging, 'XData', x, 'YData', y);
        % Move text
        userData = dragging.UserData;
        newCenter = userData.Center + diff;
        userData.Center = newCenter;
        set(userData.Text, 'Position', newCenter);
        dragging.UserData = userData;
    end
    function rotateObject(~, event)
        if isempty(selected), return; end
        if strcmp(event.Key, 'r')
            % Rotate 15 degrees
            rotatePatch(selected, 15);
        end
    end
    function rotatePatch(patchObj, angle)
        userData = patchObj.UserData;
        theta = deg2rad(angle);
        R = [cos(theta), -sin(theta); sin(theta), cos(theta)];
        % Rotate around center
        x = get(patchObj, 'XData')'; x = x(:);
        y = get(patchObj, 'YData')'; y = y(:);
        vertices = [x y];
        center = userData.Center;
        centered = vertices - center;
        rotated = (R * centered')';
        newVerts = rotated + center;
        % Apply new vertices
        set(patchObj, 'XData', newVerts(:,1), 'YData', newVerts(:,2));
        set(userData.Text, 'Position', mean(newVerts,1));
        userData.Rotation = mod(userData.Rotation + angle, 360);
        patchObj.UserData = userData;
    end
end