我想通过在按住左键的同时拖动鼠标在图像顶部绘制一组断开的线。但是,如果我单击先前绘制的线以指定下一行的起点,则不会调用回调函数并且我不明白这一点。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
请您帮我找出其中的问题。
提前谢谢你..
干杯,索桑