通过在matlab中拖动鼠标来绘制线条

Question

我想在按下左键的同时拖动鼠标,在图像上绘制一组断开的线.但是,如果我单击先前绘制的行来指定下一行的起始点,则不会调用回调函数,但我没有得到这一点.这是我的代码:

function main_test

S.fH = figure('menubar','none');
im = imread( 'image.jpg' );

S.aH = axes;
S.iH = imshow( im ); hold on
axis image;

X = [];
Y = [];

set(S.aH,'ButtonDownFcn',@startDragFcn)
set(S.iH,'ButtonDownFcn',@startDragFcn)
set(S.fH, 'WindowButtonUpFcn', @stopDragFcn);

function startDragFcn(varargin)
    set( S.fH, 'WindowButtonMotionFcn', @draggingFcn );
    pt = get(S.aH, 'CurrentPoint');
    x = pt(1,1);
    y = pt(1,2);
    X = x;
    Y = y;
end

function draggingFcn(varargin)
    pt = get(S.aH, 'CurrentPoint');
    x = pt(1,1);
    y = pt(1,2);
    X = [X x];
    Y = [Y y];

    plot(X, Y, 'r', 'LineWidth', 6);
    hold on
    drawnow 
end

function stopDragFcn(varargin)
    set(S.fH, 'WindowButtonMotionFcn', '');  %eliminate fcn on release
end

end

你能帮我解决一下这个问题.

谢谢你提前..

欢呼声,Sawsan

Answer 1

您还需要ButtonDownFcn在绘制的线上设置属性,即

plot(X,Y,'r','LineWidth',6,'ButtonDownFcn',@startDragFcn)