draw polygon continuously with mouse

Question

$Amit Ifrach$

Amit Ifrach 2024-7-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2141391-draw-polygon-continuously-with-mouse

编辑： Piyush Kumar 2024-7-30

לק"י

Hi guys,

I need to contour some cells. I want to use the drawpolygon command, or an equivalent of it, that will record mouse position continuously while mouse left click button is held. No such option seems to be in the drawpolygon documentation.

There are some old answers about how to do it, the problem is that most of the codes there somewhy don't work when I try to use them. Is there any other easy/quick way to obtain mouse position only when left mouse button is held?

Thanks,

Amit.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Piyush Kumar 2024-7-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2141391-draw-polygon-continuously-with-mouse#answer_1492366

编辑：Piyush Kumar 2024-7-30

在 MATLAB Online 中打开

@Amit Ifrach,

You can use "WindowButtonMotionFcn". Read more about this from "Window Callbacks" section of this documentation link.

Step 1: Create a file named "drawPolygon.m" with the following content -

function drawPolygon()
    figure('WindowButtonMotionFcn', @mouseMove);
    global isDown;
    isDown = false;
    set(gcf, 'WindowButtonDownFcn', @mouseDown);
    set(gcf, 'WindowButtonUpFcn', @mouseUp);
end
function mouseMove(src, event)
    global isDown;
    if isDown
        C = get(gca, 'CurrentPoint');
        disp(['Cursor position is (' num2str(C(1,1)) ', ' num2str(C(1,2)) ')']);
    end
end
function mouseDown(src, event)
    global isDown;
    isDown = true;
end
function mouseUp(src, event)
    global isDown;
    isDown = false;
end